Search

Your search keyword '"Filgas R"' showing total 476 results
Start Over Author "Filgas R"
476 results on '"Filgas R"'

51. A photometric redshift of $z=1.8^{+0.4}_{-0.3}$ for the \agile GRB 080514B

Author

Rossi, A., Postigo, A. de Ugarte, Ferrero, P., Kann, D. A., Klose, S., Schulze, S., Greiner, J., Schady, P., Filgas, R., Gonsalves, E. E., Yoldaş, A. Küpcü, Krühler, T., Szokoly, G., Yoldaş, A., Afonso, P. M. J., Clemens, C., Bloom, J. S., Perley, D. A., Fynbo, J. P. U., Castro-Tirado, A. J., Gorosabel, J., Kubánek, P., Updike, A. C., Hartmann, D. H., Giuliani, A., Holland, S. T., Hanlon, L., Bremer, M., and García-Hernández, A.

Subjects
Astrophysics
Abstract

Aims: The AGILE gamma-ray burst GRB 080514B is the first burst with detected emission above 30 MeV and an optical afterglow. However, no spectroscopic redshift for this burst is known. Methods: We compiled ground-based photometric optical/NIR and millimeter data from several observatories, including the multi-channel imager GROND, as well as ultraviolet \swift UVOT and X-ray XRT observations. The spectral energy distribution of the optical/NIR afterglow shows a sharp drop in the \swift UVOT UV filters that can be utilized for the estimation of a redshift. Results: Fitting the SED from the \swift UVOT $uvw2$ band to the $H$ band, we estimate a photometric redshift of $z=1.8^{+0.4}_{-0.3}$, consistent with the pseudo redshift reported by Pelangeon & Atteia (2008) based on the gamma-ray data. Conclusions: The afterglow properties of GRB 080514B do not differ from those exhibited by the global sample of long bursts, supporting the view that afterglow properties are basically independent of prompt emission properties., Comment: submitted to A&A letters

Published
2008
Full Text
View/download PDF

53. SHORT GRB AFTERGLOWS OBSERVED WITH GROND

Author

Guelbenzu, A. Nicuesa, primary, Klose, S., additional, Rossi, A., additional, Schmidl, S., additional, Greiner, J., additional, Kann, D. A., additional, Elliott, J., additional, Olivares, F. E., additional, Rau, A., additional, Schady, P., additional, Sudilovsky, V., additional, Kruhler, T., additional, Ferrero, P., additional, Schulze, S., additional, Afonso, P. M. J., additional, Filgas, R., additional, and Nardini, M., additional

Published
2020
Full Text
View/download PDF

54. In-Orbit Commissioning of Czech Nanosatellite VZLUSAT-1 for the QB50 Mission with a Demonstrator of a Miniaturised Lobster-Eye X-Ray Telescope and Radiation Shielding Composite Materials

Author

Daniel, V., Inneman, A., Vertat, I., Baca, T., Nentvich, O., Urban, M., Stehlikova, V., Sieger, L., Skala, P., Filgas, R., Zadrazil, V., Linhart, R., Masopust, J., Jamroz, T., Pina, L., Marsikova, V., Mikulickova, L., Belas, E., Pospisil, S., Vykydal, Z., Mora, Y., and Pavlica, R.

Published
2019
Full Text
View/download PDF

56. The Fast Evolution of SN 2010bh Associated with XRF 100316D

Author

Olivares E., F, Greiner, J, Schady, P, Rau, A, Klose, S, Kruhler, T, Afonso, P. M. J, Updike, A. C, Nardini, M, Filgas, R, Nicuesa Guelbenzu, A, Clemens, C, Elliott, J, Kann, D. A, Rossi, A, and Sudilovsky, V

Subjects
Astrophysics
Abstract

The first observational evidence of a connection between supernovae (SNe) and gamma-ray bursts (GRBs) was found about a decade ago. Since then, only half a dozen spectroscopically confirmed associations have been discovered and XRF 1003160 associated with the type-Ic SN 20lObh is among the latest. Aims. We constrain the progenitor radius, the host-galaxy extinction, and the physical parameters of the explosion of XRF l00316D/SN 20lObh at z 0.059. We study the SN brightness and colours in the context of GRB-SNe. Methods. We began observations with the Gamma-Ray burst Optical and Near-infrared Detector (GROND) 12 hours after the GRB trigger and continued until 80 days after the burst. GROND provided excellent photometric data in six filter bands covering a wavelength range from approximately 350 to 1800 nm, significantly expanding the pre-existing data set for this event. Combining GROND and Swift data, the early broad-band spectral energy distribution (SED) is modelled with a blackbody and afterglow component attenuated by dust and gas absorption. The temperature and radius evolution of the thermal component are analysed and combined with earlier measurements available from the literature. Templates of SN 1998bw are fitted to the SN itself to directly compare the lightcurve properties. Finally, a two-component parametrized model is fitted to the quasi-bolometric light curve. which delivers physical parameters of the explosion. Results. The best-fit models to the broad-band SEDs imply moderate reddening along the line of sight through the host galaxy (A(sub v.host = 1.2 +/- 0.1 mag). Furthermore, the parameters of the blackbody component reveal a cooling envelope at an apparent initial radius of 7 x 10(exp 11) cm, which is compatible with a dense wind surrounding a Wolf-Rayet star. A multicolor comparison shows that SN 2010bh is 60 - 70% as bright as SN 1998bw. Reaching maximum brightness at 8 - 9 days after the burst in the blue bands, SN 20lObh proves to be the most rapidly evolving GRB-SNe to date. Modelling of the quasi-bolometric light curve yields M(sub Ni) = 0.21 +/- 0.03 solar M and M(sub ej) = 2.6 +/- 0.2 solar M, typical of values within the GRB-SN population. The kinetic energy is E(sub k) = (2.4 +/- 0.7) x 10(exp 52) erg, which is making this SN the second most energetic GRB-SN after SN 1998bw. Conclusions. This supernova has one of the earliest peaks ever recorded and thereafter fades more rapidly than other GRB-SNe, hypernovae, or typical type-Ic SNe. This could be explained by a thin envelope expanding at very high velocities, which is therefore unable to retain the gamma-rays that would prolong the duration of the SN event.

Published
2012

58. BL Lacertae Objects Beyond Redshift 1.3 - UV-to-NIR Photometry and Photometric Redshift for Fermi/LAT Blazars

Author

Rau, A, Schady, P, Greiner, J, Salvato, M, Ajello, M, Bottacini, E, Gehrels, N, Afonso, P. M. J, Elliott, J, Filgas, R, Kann, D. A, Klose, S, Kruehler, T, Nardini, M, Guelbenzu, A. Nicuesa, OlivaresE, F, Rossi, A, Sudilovsky. V, Updike, A. C, and Hartmann, D. H

Subjects
Astrophysics
Abstract

Context. Observations of the gamma-ray sky with Fermi led to significant advances towards understanding blazars, the most extreme class of Active Galactic Nuclei. A large fraction of the population detected by Fermi is formed by BL Lacertae (BL Lac) objects, whose sample has always suffered from a severe redshift incompleteness due to the quasi-featureless optical spectra. Aims. Our goal is to provide a significant increase of the number of confirmed high-redshift BL Lac objects contained in the 2 LAC Fermi/LAT catalog. Methods. For 103 Fermi/LAT blazars, photometric redshifts using spectral energy distribution fitting have been obtained. The photometry includes 13 broad-band filters from the far ultraviolet to the near-IR observed with Swift/UVOT and the multi-channel imager GROND at the MPG/ESO 2.2m telescope. Data have been taken quasi-simultaneously and the remaining source-intrinsic variability has been corrected for. Results. We release the UV-to-near-IR 13-band photometry for all 103 sources and provide redshift constraints for 75 sources without previously known redshift. Out of those, eight have reliable photometric redshifts at z > or approx. 1.3, while for the other 67 sources we provide upper limits. Six of the former eight are BL Lac objects, which quadruples the sample of confirmed high-redshift BL Lac. This includes three sources with redshifts higher than the previous record for BL Lac, including CRATES J0402-2615, with the best-fit solution at z approx. = 1.9.

Published
2011

59. GRB 091127: The Cooling Break Race on Magnetic Fuel

Author

Filgas, R, Greiner, J, Schady, P, Kruhler, T, Updike, A. C, Klose, S, Nardini, M, Kann, D. A, Rossi, A, Sudilovsky, V, Afonso, P. M. J, Clemens, C, Elliott, J, Nicuesa Guelbenzu, A, Olivares, F, and Rau, A

Subjects
Astronomy
Abstract

Using high-quality, broad-band afterglow data for GRB 091127, we investigate the validity of the synchrotron fireball model for gamma-ray bursts, and infer physical parameters of the ultra-relativistic outflow. Methods. We used multi-wavelength (NIR to X-ray) follow-up observations obtained with GROND simultaneously in the g' r' t' i' z' JH filters and the XRT onboard the Swift satellite in the 0.3 to 10 keY energy range. The resulting afterglow light curve is of excellent accuracy with relative photometric errors as low as 1 %, and the spectral energy distribution (SED) is well-sampled over 5 decades in energy. These data present one of the most comprehensive observing campaigns for a single GRB afterglow and allow us to test several proposed emission models and outflow characteristics in unprecedented detail. Results. Both the multi-color light curve and the broad-band SED of the afterglow of GRB 091127 show evidence of a cooling break moving from high to lower energies. The early light curve is well described by a broken power-law, where the initial decay in the optical/NlR wavelength range is considerably flatter than at X-rays. Detailed fitting of the time-resolved SED shows that the break is very smooth with a sharpness index of 2.2 +/- 0.2, and evolves towards lower frequencies as a power-law with index -1.23 +/- 0.06. These are the first accurate and contemporaneous measurements of both the sharpness of the spectral break and its time evolution. Conclusions. The measured evolution of the cooling break (V(sub c) varies as t(sup -1.2) is not consistent with the predictions of the standard model, wherein V(sub c) varies as t(sup -05) is expected. A possible explanation for the observed behavior is a time dependence of the microphysical parameters, in particular the fraction of the total energy in the magnetic field epsilon(sub Beta). This conclusion provides further evidence that the standard fireball model is too simplistic, and time-dependent micro-physical parameters may be required to model the growing number of well-sampled afterglow light curves.

Published
2011

60. The SEDs and Host Galaxies of the Dustiest GRB Afterglows

Author

Kruhler, T, Greiner, J, Schady, P, Savaglio, S, Afonso, P. M. J, Clemens, C, Elliott, J, Filgas, R, Gruber, D, Kann, D. A, Klose, S, Kupcu-Yoldas, A, McBreen, S, Olivares, E, Pierini, D, Rau, A, Rossi, A, Nardini, M, Nicuesa Guelbenzu, A, Sudilovsky, V, and Updike, A. C

Subjects
Astrophysics
Abstract

The afterglows and host galaxies of long gamma-ray bursts (GRBs) offer unique opportunities to study star-forming galaxies in the high-z Universe, Until recently, however. the information inferred from GRB follow-up observations was mostly limited to optically bright afterglows. biasing all demographic studies against sight-lines that contain large amounts of dust. Aims. Here we present afterglow and host observations for a sample of bursts that are exemplary of previously missed ones because of high visual extinction (A(sub v) (Sup GRB) approx > 1 mag) along the sight-line. This facilitates an investigation of the properties, geometry and location of the absorbing dust of these poorly-explored host galaxies. and a comparison to hosts from optically-selected samples. Methods. This work is based on GROND optical/NIR and Swift/XRT X-ray observations of the afterglows, and multi-color imaging for eight GRB hosts. The afterglow and galaxy spectral energy distributions yield detailed insight into physical properties such as the dust and metal content along the GRB sight-line as well as galaxy-integrated characteristics like the host's stellar mass, luminosity. color-excess and star-formation rate. Results. For the eight afterglows considered in this study we report for the first time the redshift of GRBs 081109 (z = 0.97S7 +/- 0.0005). and the visual extinction towards GRBs 0801109 (A(sub v) (Sup GRB) = 3.4(sup +0.4) (sub -0.3) mag) and l00621A (A(sub v) (Sup GRB) = 3.8 +/- 0.2 mag), which are among the largest ever derived for GRB afterglows. Combined with non-extinguished GRBs. there is a strong anti-correlation between the afterglow's metals-to-dust ratio and visual extinction. The hosts of the dustiest afterglows are diverse in their properties, but on average redder(((R - K)(sub AB)) approximates 1.6 mag), more luminous ( approximates 0.9 L (sup *)) and massive ((log M(sup *) [M(solar]) approximates 9.8) than the hosts of optically-bright events. We hence probe a different galaxy population. suggesting that previous host samples miss most of the massive. chemically-evolved and metal-rich members. This also indicates that the dust along the sight-line is often related to host properties, and thus probably located in the diffuse ISM or interstellar clouds and not in the immediate GRB environment. Some of the hosts in our sample. are blue, young or of small stellar mass illustrating that even apparently non-extinguished galaxies possess very dusty sight-lines due to a patchy dust distribution. Conclusions. The afterglows and host galaxies of the dustiest GRBs provide evidence for a complex dust geometry in star-forming galaxies. In addition, they establish a population of luminous. massive and correspondingly chemically-evolved GRB hosts. This suggests that GRBs trace the global star-formation rate better than studies based on optically-selected host samples indicate, and the previously-claimed deficiency of high-mass host galaxies was at least partially a selection effect.

Published
2011

61. The Swift/Fermi GRB 080928 from 1 eV to 150 keV

Author

Sonbas, Eda, Rossi, A, Schulze, S, Klose, S, Kann, D. A, Ferrero, P, NicuesaGuelbenzu, A, Rau, A, Kruehler, T, Greiner, J, Schady, P, Afonso, P. M. J, Clemens, C, Filgas, R, KuepcuYoldas, A, McBreen, S, Olivares, F, Szokoly, G, Yoldas, A, Krimm, H. A, Johannesson, G, Panaitescu, A, Yuan, F, Pandey, S. B, and Akerlof, C. W

Subjects
Astrophysics
Abstract

We present the results of a comprehensive study of the Gamma-Ray Burst 080928 and of its afterglow. GRB 08092 was a long burst detected by Swift/BAT and Fermi/GBM, It is one of the exceptional cases where optical emission was already detected when the GRB itself was still radiating in the gamma-ray band. for nearly 100 seconds simultaneous optical X-ray and gamma-ray data provide a coverage of the spectral energy distribution of the transient source from about 1 eV to 150 keV. Here we analyze the prompt emission, constrain its spectral propertIes. and set lower limits on the initial Lorentz factor of the relativistic outflow, In particular. we show that the SED during the main prompt emission phase is in agreement with synchrotron radiation. We construct the optical/near-infrared light curve and the spectral energy distribution based on Swift/UVOT. ROTSE-Illa (Australia) and GROND (La Silla) data and compare it to the X-ray light curve retrieved from the Swift/XRT repository. We show that its bumpy shape can be modeled by multiple energy injections into the forward shock. Furthermore, we provide evidence that the temporal and spectral evolution of the first strong flare seen in the early X-ray light curve can be explained by large-angle emission. Finally, we report on the results of our search for the GRB host galaxy, for which only a deep upper limit can be provided.

Published
2010

64. Highly luminous supernovae associated with gamma-ray bursts

Author

Kann, D. A., primary, Schady, P., additional, Olivares E., F., additional, Klose, S., additional, Rossi, A., additional, Perley, D. A., additional, Krühler, T., additional, Greiner, J., additional, Nicuesa Guelbenzu, A., additional, Elliott, J., additional, Knust, F., additional, Filgas, R., additional, Pian, E., additional, Mazzali, P., additional, Fynbo, J. P. U., additional, Leloudas, G., additional, Afonso, P. M. J., additional, Delvaux, C., additional, Graham, J. F., additional, Rau, A., additional, Schmidl, S., additional, Schulze, S., additional, Tanga, M., additional, Updike, A. C., additional, and Varela, K., additional

Published
2019
Full Text
View/download PDF

65. Four GRB supernovae at redshifts between 0.4 and 0.8

Author

Klose, S., primary, Schmidl, S., additional, Kann, D. A., additional, Nicuesa Guelbenzu, A., additional, Schulze, S., additional, Greiner, J., additional, Olivares E., F., additional, Krühler, T., additional, Schady, P., additional, Afonso, P. M. J., additional, Filgas, R., additional, Fynbo, J. P. U., additional, Rau, A., additional, Rossi, A., additional, Takats, K., additional, Tanga, M., additional, Updike, A. C., additional, and Varela, K., additional

Published
2019
Full Text
View/download PDF

66. Highly luminous supernovae associated with gamma-ray bursts I. GRB 111209A/SN 2011kl in the context of stripped-envelope and superluminous supernovae

Author

Kann, D. A., Schady, P., Olivares, F. E., Klose, S., Rossi, A., Perley, D. A., Kruehler, T., Greiner, J., Guelbenzu, A. Nicuesa, Elliott, J., Knust, F., Filgas, R., Pian, E., Mazzali, P., Fynbo, J. P. U., Leloudas, G., Afonso, P. M. J., Delvaux, C., Graham, J. F., Rau, A., Schmidl, S., Schulze, S., Tanga, M., Updike, A. C., Varela, K., Kann, D. A., Schady, P., Olivares, F. E., Klose, S., Rossi, A., Perley, D. A., Kruehler, T., Greiner, J., Guelbenzu, A. Nicuesa, Elliott, J., Knust, F., Filgas, R., Pian, E., Mazzali, P., Fynbo, J. P. U., Leloudas, G., Afonso, P. M. J., Delvaux, C., Graham, J. F., Rau, A., Schmidl, S., Schulze, S., Tanga, M., Updike, A. C., and Varela, K.

Published
2019

67. Four GRB supernovae at redshifts between 0.4 and 0.8. The bursts GRB 071112C, 111228A, 120714B, and 130831A

Author

Ministerio de Economía y Competitividad (España), Fondo Nacional de Desarrollo Científico y Tecnológico (Chile), European Commission, Alexander von Humboldt Foundation, Thuringian Ministry of Education, Science and Culture, German Research Foundation, Max Planck Institute for extraterrestrial Physics, Friedrich Schiller University Jena, Thüringer Landessternwarte Tautenburg Karl Schwarzschild-Observatorium, Klose, S., Schmidl, S., Kann, D.A., Nicuesa Guelbenzu, A., Schulze, S., Greiner, J., Olivares E., F., Krühler, T., Schady, P., Afonso, P.M.J., Filgas, R., Fynbo, J. P. U., Rau, A., Rossi, A., Takats, K., Tanga, M., Updike, A. C., Varela, K., Ministerio de Economía y Competitividad (España), Fondo Nacional de Desarrollo Científico y Tecnológico (Chile), European Commission, Alexander von Humboldt Foundation, Thuringian Ministry of Education, Science and Culture, German Research Foundation, Max Planck Institute for extraterrestrial Physics, Friedrich Schiller University Jena, Thüringer Landessternwarte Tautenburg Karl Schwarzschild-Observatorium, Klose, S., Schmidl, S., Kann, D.A., Nicuesa Guelbenzu, A., Schulze, S., Greiner, J., Olivares E., F., Krühler, T., Schady, P., Afonso, P.M.J., Filgas, R., Fynbo, J. P. U., Rau, A., Rossi, A., Takats, K., Tanga, M., Updike, A. C., and Varela, K.

Abstract

Twenty years ago, GRB 980425/SN 1998bw revealed that long gamma-ray bursts (GRBs) are physically associated with broad-lined type-Ic supernovae (SNe). Since then more than 1000 long GRBs have been localized to high angular precision, but only in ~50 cases has the underlying SN component been identified. Using the Gamma-Ray Burst Optical Near-Infrared Detector (GROND) multi-channel imager at ESO/La Silla, during the last ten years we have devoted a substantial amount of observing time to reveal and study SN components in long-GRB afterglows. Here we report on four more GRB SNe (associated with GRBs 071112C, 111228A, 120714B, and 130831A) which were discovered and/or followed-up with GROND and whose redshifts lie between z¿=¿0.4 and 0.8. We study their afterglow light curves, follow the associated SN bumps over several weeks, and characterize their host galaxies. Using SN 1998bw as a template, the derived SN explosion parameters are fully consistent with the corresponding properties of the currently known GRB-SN ensemble, with no evidence for an evolution of their properties as a function of redshift. In two cases (GRB 120714B/SN 2012eb at z¿=¿0.398 and GRB 130831A/SN 2013fu at z¿=¿0.479) additional Very Large Telescope (VLT) spectroscopy of the associated SNe revealed a photospheric expansion velocity at maximum light of about 40 000 and 20 000 km s¿1, respectively. For GRB 120714B, which was an intermediate-luminosity burst, we find additional evidence for a black-body component in the light of the optical transient at early times, similar to what has been detected in some GRB SNe at lower redshifts.© ESO 2019.

Published
2019

68. Highly luminous supernovae associated with gamma-ray bursts: I. GRB 111209A/SN 2011kl in the context of stripped-envelope and superluminous supernovae

Author

Comisión Nacional de Investigación Científica y Tecnológica (Chile), European Commission, Istituto Nazionale di Astrofisica, Ministerio de Economía y Competitividad (España), Thuringian Ministry of Education, Science and Culture, German Research Foundation, Kann, D.A., Schady, P., Olivares, E., Klose, S., Rossi, A., Perley, D.A., Krühler, T., Greiner, J., Nicuesa Guelbenzu, A., Elliott, J., Knust, F., Filgas, R., Pian, E., Mazzali, Paolo A., Fynbo, J. P. U., Leloudas, Giorgos, Afonso, P.M.J., Delvaux, C., Graham, J.F., Rau, A., Schmidl, S., Schulze, S., Tanga, M., Updike, A.C., Varela, K., Comisión Nacional de Investigación Científica y Tecnológica (Chile), European Commission, Istituto Nazionale di Astrofisica, Ministerio de Economía y Competitividad (España), Thuringian Ministry of Education, Science and Culture, German Research Foundation, Kann, D.A., Schady, P., Olivares, E., Klose, S., Rossi, A., Perley, D.A., Krühler, T., Greiner, J., Nicuesa Guelbenzu, A., Elliott, J., Knust, F., Filgas, R., Pian, E., Mazzali, Paolo A., Fynbo, J. P. U., Leloudas, Giorgos, Afonso, P.M.J., Delvaux, C., Graham, J.F., Rau, A., Schmidl, S., Schulze, S., Tanga, M., Updike, A.C., and Varela, K.

Abstract

Context. GRB 111209A, one of the longest gamma-ray bursts (GRBs) ever observed, is linked to SN 2011kl, which is the most luminous GRB supernova (SN) detected so far. Several lines of evidence indicate that this GRB-SN is powered by a magnetar central engine. Aims. We place SN 2011kl into the context of large samples of SNe, addressing in more detail the question of whether this GRB-SN could be radioactively powered, and whether it represents an extreme version of a GRB-SN or an underluminous superluminous SN (SLSN). Methods. We modelled SN 2011kl using SN 1998bw as a template and derived a bolometric light curve including near-infrared data. We compared the properties of SN 2011kl to literature results on stripped-envelope and SLSNe. Results. A comparison in the k,- s context, i.e. comparing SN 2011kl to SN 1998bw templates in terms of luminosity and light-curve stretch, clearly shows SN 2011kl is the most luminous GRB-SN to date and is spectrally very dissimilar to other events because it is significantly bluer/hotter. Although SN 2011kl does not reach the classical luminosity threshold of SLSNe and evolves faster than any of these objects, it resembles SLSNe more than the classical GRB-associated broad-lined Type Ic SNe in several aspects. Conclusions. GRB 111209A was a very energetic event, both at early (prompt emission) and at very late (SN) times. We show in a companion publication that with the exception of the extreme duration, the GRB and afterglow parameters are in agreement with the known distributions for these parameters. SN 2011kl, on the other hand, is exceptional both in luminosity and spectral characteristics, indicating that GRB 111209A was likely not powered by a standard-model collapsar central engine, further supporting our earlier conclusions. Instead, it reveals the possibility of a direct link between GRBs and SLSNe.© ESO 2019.

Published
2019

69. The luminous host galaxy, faint supernova and rapid afterglow rebrightening of GRB 100418A

Author

de Ugarte Postigo, A., primary, Thöne, C. C., additional, Bensch, K., additional, van der Horst, A. J., additional, Kann, D. A., additional, Cano, Z., additional, Izzo, L., additional, Goldoni, P., additional, Martín, S., additional, Filgas, R., additional, Schady, P., additional, Gorosabel, J., additional, Bikmaev, I., additional, Bremer, M., additional, Burenin, R., additional, Castro-Tirado, A. J., additional, Covino, S., additional, Fynbo, J. P. U., additional, Garcia-Appadoo, D., additional, de Gregorio-Monsalvo, I., additional, Jelínek, M., additional, Khamitov, I., additional, Kamble, A., additional, Kouveliotou, C., additional, Krühler, T., additional, Leloudas, G., additional, Melnikov, S., additional, Nardini, M., additional, Perley, D. A., additional, Petitpas, G., additional, Pooley, G., additional, Rau, A., additional, Rol, E., additional, Sánchez-Ramírez, R., additional, Starling, R. L. C., additional, Tanvir, N. R., additional, Wiersema, K., additional, Wijers, R. A. M. J., additional, and Zafar, T., additional

Published
2018
Full Text
View/download PDF

72. The optical/NIR afterglow of GRB 111209A: Complex yet not unprecedented

Author

Kann, D. A., primary, Schady, P., additional, Olivares, E. F., additional, Klose, S., additional, Rossi, A., additional, Perley, D. A., additional, Zhang, B., additional, Krühler, T., additional, Greiner, J., additional, Nicuesa Guelbenzu, A., additional, Elliott, J., additional, Knust, F., additional, Cano, Z., additional, Filgas, R., additional, Pian, E., additional, Mazzali, P., additional, Fynbo, J. P. U., additional, Leloudas, G., additional, Afonso, P. M. J., additional, Delvaux, C., additional, Graham, J. F., additional, Rau, A., additional, Schmidl, S., additional, Schulze, S., additional, Tanga, M., additional, Updike, A. C., additional, and Varela, K., additional

Published
2018
Full Text
View/download PDF

74. The optical/NIR afterglow of GRB 111209A:Complex yet not unprecedented

Author

Kann, D. A., Schady, P., Olivares, E. F., Klose, S., Rossi, A., Perley, D. A., Zhang, B., Kruehler, T., Greiner, J., Guelbenzu, A. Nicuesa, Elliott, J., Knust, F., Cano, Z., Filgas, R., Pian, E., Mazzali, P., Fynbo, J. P. U., Leloudas, G., Afonso, P. M. J., Delvaux, C., Graham, J. F., Rau, A., Schmidl, S., Schulze, S., Tanga, M., Updike, A. C., Varela, K., Kann, D. A., Schady, P., Olivares, E. F., Klose, S., Rossi, A., Perley, D. A., Zhang, B., Kruehler, T., Greiner, J., Guelbenzu, A. Nicuesa, Elliott, J., Knust, F., Cano, Z., Filgas, R., Pian, E., Mazzali, P., Fynbo, J. P. U., Leloudas, G., Afonso, P. M. J., Delvaux, C., Graham, J. F., Rau, A., Schmidl, S., Schulze, S., Tanga, M., Updike, A. C., and Varela, K.

Published
2018

75. The optical/NIR afterglow of GRB 111209A: Complex yet not unprecedented

Author

German Research Foundation, Ministerio de Economía y Competitividad (España), European Commission, Comisión Nacional de Investigación Científica y Tecnológica (Chile), Thuringian Ministry of Education, Science and Culture, Ministerio de Economía, Fomento y Turismo (Chile), Kann, D.A., Schady, P., Olivares, E. F., Klose, S., Rossi, A., Perley, D.A., Zhang, B., Krühler, T., Greiner, J., Nicuesa Guelbenzu, A., Elliott, J., Knust, F., Cano, Z., Filgas, R., Pian, E., Mazzali, Paolo A., Fynbo, J. P. U., Leloudas, Giorgos, Afonso, P.M.J., Delvaux, C., Graham, J.F., Rau, A., Schmidl, S., Schulze, S., Tanga, M., Updike, A. C., Varela, K., German Research Foundation, Ministerio de Economía y Competitividad (España), European Commission, Comisión Nacional de Investigación Científica y Tecnológica (Chile), Thuringian Ministry of Education, Science and Culture, Ministerio de Economía, Fomento y Turismo (Chile), Kann, D.A., Schady, P., Olivares, E. F., Klose, S., Rossi, A., Perley, D.A., Zhang, B., Krühler, T., Greiner, J., Nicuesa Guelbenzu, A., Elliott, J., Knust, F., Cano, Z., Filgas, R., Pian, E., Mazzali, Paolo A., Fynbo, J. P. U., Leloudas, Giorgos, Afonso, P.M.J., Delvaux, C., Graham, J.F., Rau, A., Schmidl, S., Schulze, S., Tanga, M., Updike, A. C., and Varela, K.

Abstract

Context. Afterglows of gamma-ray bursts (GRBs) are simple in the most basic model, but can show many complex features. The ultra-long duration GRB 111209A, one of the longest GRBs ever detected, also has the best-monitored afterglow in this rare class of GRBs. Aims. We want to address the question whether GRB 111209A was a special event beyond its extreme duration alone, and whether it is a classical GRB or another kind of high-energy transient. The afterglow may yield significant clues. Methods. We present afterglow photometry obtained in seven bands with the GROND imager as well as in further seven bands with the Ultraviolet/Optical Telescope (UVOT) on-board the Neil Gehrels Swift Observatory. The light curve is analysed by multi-band modelling and joint fitting with power-laws and broken power-laws, and we use the contemporaneous GROND data to study the evolution of the spectral energy distribution. We compare the optical afterglow to a large ensemble we have analysed in earlier works, and especially to that of another ultra-long event, GRB 130925A. We furthermore undertake a photometric study of the host galaxy. Results. We find a strong, chromatic rebrightening event at 0.8 days after the GRB, during which the spectral slope becomes redder. After this, the light curve decays achromatically, with evidence for a break at about 9 days after the trigger. The afterglow luminosity is found to not be exceptional. We find that a double-jet model is able to explain the chromatic rebrightening. The afterglow features have been detected in other events and are not unique. Conclusions. The duration aside, the GRB prompt emission and afterglow parameters of GRB 111209A are in agreement with the known distributions for these parameters. While the central engine of this event may differ from that of classical GRBs, there are multiple lines of evidence pointing to GRB 111209A resulting from the core-collapse of a massive star with a stripped envelope.© 2018 ESO.

Published
2018

76. The luminous host galaxy, faint supernova and rapid afterglow rebrightening of GRB 100418A

Author

Ministerio de Economía y Competitividad (España), European Commission, The Scientific and Technological Research Council of Turkey, Kazan Federal University, German Research Foundation, Agenzia Spaziale Italiana, Alexander von Humboldt Foundation, Ugarte Postigo, Antonio de, Thöne, Cristina Carina, Bensch, K., Van Der Horst, A.J., Kann, D.A., Cano, Z., Izzo, L., Goldoni, P., Martín, S., Filgas, R., Schady, P., Gorosabel, J., Bikmaev, I., Bremer, M., Burenin, R., Castro-Tirado, Alberto J., Covino, Stefano, Fynbo, J. P. U., Garcia-Appadoo, D., de Gregorio-Monsalvo, Itziar, Jelínek, M., Khamitov, I., Kamble, A., Kouveliotou, C., Krühler, T., Leloudas, Giorgos, Melnikov, S., Nardini, M., Perley, D.A., Petitpas, G., Pooley, G., Rau, A., Rol, E., Sánchez-Ramírez, R., Starling, R.L.C., Tanvir, N.R., Wiersema, K., Wijers, R.A.M.J., Zafar, T., Ministerio de Economía y Competitividad (España), European Commission, The Scientific and Technological Research Council of Turkey, Kazan Federal University, German Research Foundation, Agenzia Spaziale Italiana, Alexander von Humboldt Foundation, Ugarte Postigo, Antonio de, Thöne, Cristina Carina, Bensch, K., Van Der Horst, A.J., Kann, D.A., Cano, Z., Izzo, L., Goldoni, P., Martín, S., Filgas, R., Schady, P., Gorosabel, J., Bikmaev, I., Bremer, M., Burenin, R., Castro-Tirado, Alberto J., Covino, Stefano, Fynbo, J. P. U., Garcia-Appadoo, D., de Gregorio-Monsalvo, Itziar, Jelínek, M., Khamitov, I., Kamble, A., Kouveliotou, C., Krühler, T., Leloudas, Giorgos, Melnikov, S., Nardini, M., Perley, D.A., Petitpas, G., Pooley, G., Rau, A., Rol, E., Sánchez-Ramírez, R., Starling, R.L.C., Tanvir, N.R., Wiersema, K., Wijers, R.A.M.J., and Zafar, T.

Abstract

Context. Long gamma-ray bursts (GRBs) give us the chance to study both their extreme physics and the star-forming galaxies in which they form. Aims. GRB 100418A, at a redshift of z = 0.6239, had a bright optical and radio afterglow, and a luminous star-forming host galaxy. This allowed us to study the radiation of the explosion as well as the interstellar medium of the host both in absorption and emission. Methods. We collected photometric data from radio to X-ray wavelengths to study the evolution of the afterglow and the contribution of a possible supernova (SN) and three X-shooter spectra obtained during the first 60 h. Results. The light curve shows a very fast gamma-ray burst: individual: GRB100418A; supernovae: individual: GRB100418A; galaxies: dwarf; ISM: abundances; ISM: kinematics and dynamicsoptical rebrightening, with an amplitude of ∼3 magnitudes, starting 2.4 h after the GRB onset. This cannot be explained by a standard external shock model and requires other contributions, such as late central-engine activity. Two weeks after the burst we detect an excess in the light curve consistent with a SN with peak absolute magnitude M = -18.5 mag, among the faintest GRB-SNe detected to date. The host galaxy shows two components in emission, with velocities differing by 130 km s, but otherwise having similar properties. While some absorption and emission components coincide, the absorbing gas spans much higher velocities, indicating the presence of gas beyond the star-forming regions. The host has a star formation rate of SFR = 12.2 M yr, a metallicity of 12 + log(O/H) = 8.55, and a mass of 1.6⊙ ×⊙ 10 M. Conclusions. GRB 100418A is a member of a class of afterglow light curves which show a steep rebrightening in the optical during the first day, which cannot be explained by traditional models. Its very faint associated SN shows that GRB-SNe can have a larger dispersion in luminosities than previously seen. Furthermore, we have obtained a complete view of the host

Published
2018

77. GRB hosts through cosmic time - VLT/X-Shooter emission-line spectroscopy of 96 GRB-selected galaxies at 0.1 < z < 3.6

Author

Kr��hler, T., Malesani, D., Fynbo, J. P. U., Hartoog, O. E., Hjorth, J., Jakobsson, P., Perley, D. A., Rossi, A., Schady, P., Schulze, S., Tanvir, N. R., Vergani, S. D., Wiersema, K., Afonso, P. M. J., Bolmer, J., Cano, Z., Covino, S., D'Elia, V., Postigo, A. de Ugarte, Filgas, R., Friis, M., Graham, J. F., Greiner, J., Goldoni, P., Gomboc, A., Hammer, F., Japelj, J., Kann, D. A., Kaper, L., Klose, S., Levan, A. J., Leloudas, G., Milvang-Jensen, B., Guelbenzu, A. Nicuesa, Palazzi, E., Pian, E., Piranomonte, S., Sanchez-Ramirez, R., Savaglio, S., Selsing, J., Tagliaferri, G., Vreeswijk, P. M., Watson, D. J., and Xu, D.

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Astrophysics::High Energy Astrophysical Phenomena, Astrophysics of Galaxies (astro-ph.GA), Astrophysics::Solar and Stellar Astrophysics, FOS: Physical sciences, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

[Abridged] We present data and initial results from VLT/X-Shooter emission-line spectroscopy of 96 GRB-selected galaxies at 0.1, 33 pages, 21 figures, published in A&A 581, A125 (2015)

Published
2015
Full Text
View/download PDF

79. Microphysics and dynamics of the gamma-ray burst 121024A

Author

Varela, K., primary, van Eerten, H., additional, Greiner, J., additional, Schady, P., additional, Elliott, J., additional, Sudilovsky, V., additional, Krühler, T., additional, van der Horst, A. J., additional, Bolmer, J., additional, Knust, F., additional, Agurto, C., additional, Azagra, F., additional, Belloche, A., additional, Bertoldi, F., additional, De Breuck, C., additional, Delvaux, C., additional, Filgas, R., additional, Graham, J. F., additional, Kann, D. A., additional, Klose, S., additional, Menten, K. M., additional, Nicuesa Guelbenzu, A., additional, Rau, A., additional, Rossi, A., additional, Schmidl, S., additional, Schuller, F., additional, Schweyer, T., additional, Tanga, M., additional, Weiss, A., additional, Wiseman, P., additional, and Wyrowski, F., additional

Published
2016
Full Text
View/download PDF

80. Molecular hydrogen in the damped Lyman \u03b1 system towards GRB 120815A at z = 2.36

Author

Krxfchler, T., Ledoux, C., Fynbo, J. P. U., Vreeswijk, P. M., Schmidl, S., Malesani, D., Christensen, L., De Cia, A., Hjorth, J., Jakobsson, P., Kann, D. A., Kaper, L., Vergani, S. D., Afonso, P. M. J., Covino, S., de Ugarte Postigo, A., D'Elia, V., Filgas, R., Goldoni, P., Greiner, J., Hartoog, O. E., Milvang-Jensen, B., Nardini, M., Piranomonte, S., Rossi, A., Sxe1nchez-Ramxedrez, R., Schady, P., Schulze, S., Sudilovsky, V., Tanvir, N. R., Tagliaferri, G., Watson, D. J., Wiersema, K., Wijers, R. A. M. J., Xu, D, Krxfchler, Ledoux, Fynbo, J. P. U., Vreeswijk, P. M., Schmidl, Malesani, Christensen, De Cia, Hjorth, Jakobsson, Kann, D. A., Kaper, Vergani, S. D., Afonso, P. M. J., Covino, de Ugarte Postigo, D'Elia, Filgas, Goldoni, Greiner, Hartoog, O. E., Milvang-Jensen, Nardini, Piranomonte, Rossi, Sxe1nchez-Ramxedrez, Schady, Schulze, Sudilovsky, Tanvir, N. R., Tagliaferri, Watson, D. J., Wiersema, Wijers, R. A. M. J., and D

Published
2013

83. Multiwavelength analysis of three supernovae associated with gamma-ray bursts observed by GROND

Author

Olivares, F. E., Greiner, J., Schady, P., Klose, S., Krühler, Thomas Christian, Rau, A., Savaglio, S., Kann, D. A., Pignata, G., Elliott, J., Rossi, A., Nardini, M., Afonso, P. M. J., Filgas, R., Guelbenzu, A. Nicuesa, Schmidl, S., Sudilovsky, V., Olivares, F. E., Greiner, J., Schady, P., Klose, S., Krühler, Thomas Christian, Rau, A., Savaglio, S., Kann, D. A., Pignata, G., Elliott, J., Rossi, A., Nardini, M., Afonso, P. M. J., Filgas, R., Guelbenzu, A. Nicuesa, Schmidl, S., and Sudilovsky, V.

Published
2015

84. VLT/X-Shooter emission-line spectroscopy of 96 gamma-ray-burst-selected galaxies at 0.1 <z <3.6

Author

Kruehler, T., Malesani, D., Fynbo, J. P. U., Hartoog, O. E., Hjorth, J., Jakobsson, P., Perley, D. A., Rossi, A., Schady, P., Schulze, S., Tanvir, N. R., Vergani, S. D., Wiersema, K., Afonso, P. M. J., Bolmer, J., Cano, Z., Covino, S., D'Elia, V., de Ugarte Postigo, A., Filgas, R., Friis, M., Graham, J. F., Greiner, J., Goldoni, P., Gomboc, A., Hammer, F., Japelj, J., Kann, D. A., Kaper, L., Klose, S., Levan, A. J., Leloudas, G., Milvang-Jensen, B., Guelbenzu, A. Nicuesa, Palazzi, E., Pian, E., Piranomonte, S., Sanchez-Ramirez, R., Savaglio, S., Selsing, J., Tagliaferri, G., Vreeswijk, P. M., Watson, D. J., Xu, D., Kruehler, T., Malesani, D., Fynbo, J. P. U., Hartoog, O. E., Hjorth, J., Jakobsson, P., Perley, D. A., Rossi, A., Schady, P., Schulze, S., Tanvir, N. R., Vergani, S. D., Wiersema, K., Afonso, P. M. J., Bolmer, J., Cano, Z., Covino, S., D'Elia, V., de Ugarte Postigo, A., Filgas, R., Friis, M., Graham, J. F., Greiner, J., Goldoni, P., Gomboc, A., Hammer, F., Japelj, J., Kann, D. A., Kaper, L., Klose, S., Levan, A. J., Leloudas, G., Milvang-Jensen, B., Guelbenzu, A. Nicuesa, Palazzi, E., Pian, E., Piranomonte, S., Sanchez-Ramirez, R., Savaglio, S., Selsing, J., Tagliaferri, G., Vreeswijk, P. M., Watson, D. J., and Xu, D.

Published
2015

85. Identifying the host galaxy of the short GRB 100628A

Author

Guelbenzu, A. Nicuesa, Klose, S., Palazzi, E., Greiner, J., Michalowski, M. J., Kann, D. A., Hunt, L. K., Malesani, D., Rossi, A., Savaglio, S., Schulze, S., Xu, D., Afonso, P. M. J., Elliott, J., Ferrero, P., Filgas, R., Hartmann, D. H., Kruehler, T., Knust, F., Masetti, N., Olivares E, F., Rau, A., Schady, P., Schmidl, S., Tanga, M., Updike, A. C., Varela, K., Guelbenzu, A. Nicuesa, Klose, S., Palazzi, E., Greiner, J., Michalowski, M. J., Kann, D. A., Hunt, L. K., Malesani, D., Rossi, A., Savaglio, S., Schulze, S., Xu, D., Afonso, P. M. J., Elliott, J., Ferrero, P., Filgas, R., Hartmann, D. H., Kruehler, T., Knust, F., Masetti, N., Olivares E, F., Rau, A., Schady, P., Schmidl, S., Tanga, M., Updike, A. C., and Varela, K.

Published
2015

86. Photometric redshifts for GRB afterglows from GROND and Swift/UVOT

Author

Kr��hler, T., Schady, P., Greiner, J., Afonso, P., Bottacini, E., Clemens, C., Filgas, R., Klose, S., Koch, T. S., K��pc��-Yolda��, A., Oates, S. R., Olivares, E. F., Page, M. J., McBreen, S., Nardini, M., Guelbenzu, A. Nicuesa, Rau, A., Roming, P. W. A., Rossi, A., Updike, A., and Yolda��, A.

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), FOS: Physical sciences, Astrophysics - High Energy Astrophysical Phenomena
Abstract

We present a framework to obtain photometric redshifts (photo-zs) for gamma-ray burst afterglows. Using multi-band photometry from GROND and Swift/UVOT, photo-zs are derived for five GRBs for which spectroscopic redshifts are not available. We use UV/optical/NIR data and synthetic photometry based on afterglow observations and theory to derive the photometric redshifts of GRBs and their accuracy. Taking into account the afterglow synchrotron emission properties, we investigate the application of photometry to derive redshifts in a theoretical range between z~1 and z~12. The measurement of photo-zs for GRB afterglows provides a quick, robust and reliable determination of the distance scale to the burst, particularly in those cases where spectroscopic observations in the optical/NIR range cannot be obtained. Given a sufficiently bright and mildly reddened afterglow, the relative photo-z accuracy is better than 10% between z=1.5 and z~7 and better than 5% between z=2 and z=6. We detail the approach on 5 sources without spectroscopic redshifts observed with UVOT on-board Swift and/or GROND. The distance scale to those same afterglows is measured to be $z=4.31^{+0.14}_{-0.15}$ for GRB 080825B, $z=2.13^{+0.14}_{-0.20}$ for GRB 080906, $z=3.44^{+0.15}_{-0.32}$ for GRB 081228, $z=2.03^{+0.16}_{-0.14}$ for GRB 081230 and $z=1.28^{+0.16}_{-0.15}$ for GRB 090530. Combining the response from UVOT with ground-based observatories and in particular GROND operating in the optical/NIR wavelength regime, reliable photo-zs can be obtained from z ~ 1.0 out to z ~ 10, and possibly even at higher redshifts in some favorable cases, provided that these GRBs exist, are localized quickly, have sufficiently bright afterglows and are not heavily obscured., 12 pages, 11 figures, accepted for publication by A&A

Published
2010

87. Identifying the host galaxy of the short GRB 100628A

Author

Nicuesa Guelbenzu, A., primary, Klose, S., additional, Palazzi, E., additional, Greiner, J., additional, Michałowski, M. J., additional, Kann, D. A., additional, Hunt, L. K., additional, Malesani, D., additional, Rossi, A., additional, Savaglio, S., additional, Schulze, S., additional, Xu, D., additional, Afonso, P. M. J., additional, Elliott, J., additional, Ferrero, P., additional, Filgas, R., additional, Hartmann, D. H., additional, Krühler, T., additional, Knust, F., additional, Masetti, N., additional, Olivares E., F., additional, Rau, A., additional, Schady, P., additional, Schmidl, S., additional, Tanga, M., additional, Updike, A. C., additional, and Varela, K., additional

Published
2015
Full Text
View/download PDF

88. GRB hosts through cosmic time

Author

Krühler, T., primary, Malesani, D., additional, Fynbo, J. P. U., additional, Hartoog, O. E., additional, Hjorth, J., additional, Jakobsson, P., additional, Perley, D. A., additional, Rossi, A., additional, Schady, P., additional, Schulze, S., additional, Tanvir, N. R., additional, Vergani, S. D., additional, Wiersema, K., additional, Afonso, P. M. J., additional, Bolmer, J., additional, Cano, Z., additional, Covino, S., additional, D’Elia, V., additional, de Ugarte Postigo, A., additional, Filgas, R., additional, Friis, M., additional, Graham, J. F., additional, Greiner, J., additional, Goldoni, P., additional, Gomboc, A., additional, Hammer, F., additional, Japelj, J., additional, Kann, D. A., additional, Kaper, L., additional, Klose, S., additional, Levan, A. J., additional, Leloudas, G., additional, Milvang-Jensen, B., additional, Nicuesa Guelbenzu, A., additional, Palazzi, E., additional, Pian, E., additional, Piranomonte, S., additional, Sánchez-Ramírez, R., additional, Savaglio, S., additional, Selsing, J., additional, Tagliaferri, G., additional, Vreeswijk, P. M., additional, Watson, D. J., additional, and Xu, D., additional

Published
2015
Full Text
View/download PDF

89. Multiwavelength analysis of three supernovae associated with gamma-ray bursts observed by GROND

Author

Olivares E., F., primary, Greiner, J., additional, Schady, P., additional, Klose, S., additional, Krühler, T., additional, Rau, A., additional, Savaglio, S., additional, Kann, D. A., additional, Pignata, G., additional, Elliott, J., additional, Rossi, A., additional, Nardini, M., additional, Afonso, P. M. J., additional, Filgas, R., additional, Nicuesa Guelbenzu, A., additional, Schmidl, S., additional, and Sudilovsky, V., additional

Published
2015
Full Text
View/download PDF

90. Almost twenty years' search of transuranium isotopes in effluents discharged to air from nuclear power plants with VVER reactors

Author

Hölgye Z and Filgas R

Subjects
Americium, Isotope, Epidemiology, Health, Toxicology and Mutagenesis, Radiochemistry, chemistry.chemical_element, Plutonium, law.invention, Stack (abstract data type), chemistry, law, Air Pollutants, Radioactive, Nuclear power plant, Curium, Radiology, Nuclear Medicine and imaging, VVER, Effluent, Transuranium element, Power Plants
Abstract

Airborne effluents of 5 stacks (stacks 1-5) of three nuclear power plants, with 9 pressurized water reactors VVER of 4,520 MWe total power, were searched for transuranium isotopes in different time periods. The search started in 1985. The subject of this work is a presentation of discharge data for the period of 1998-2003 and a final evaluation. It was found that 238 Pu, 239,240 Pu, 241 Am, 242 Cm, and 244 Cm can be present in airborne effluents. Transuranium isotope contents in most of the quarterly effluent samples from stacks 2, 4 and 5 were not measurable. Transuranium isotopes were present in the effluents from stack I during all 9 years of the study and from stack 3 since the 3 rd quarter of 1996 as a result of a defect in the fuel cladding. A relatively high increase of transuranium isotopes in effluents from stack 3 occurred in the 3 rd quarter of 1999, and a smaller increase occurred in the 3 rd quarter of 2003. In each instance 242 Cm prevailed in the transuranium isotope mixtures. 238 Pu/ 239,204 Pu, 241 Am/ 239,240 Pu, 242 Cm/ 239,240 Pu, and 244 Cm/ 239,240 Pu ratios in fuel for different burn-up were calculated, and comparison of these ratios in fuel and effluents was performed.

Published
2006

91. Prompt emission of GRB 121217A from gamma-rays to the near-infrared

Author

Elliou, J., Yu, H-F, Schmidl, S., Greiner, J., Gruber, G., Oates, S., Kobayashi, S., Zhang, B., Cummings, J. R., Filgas, R., Gehrels, N., Grupe, D., Kann, D. A., Klose, S., Krühler, Thomas Christian, Guelbenzu, A. Nicuesa, Rau, A., Rossi, A., Siegel, M., Schady, P., Sudilovsky, V., Tanga, M., Varela, K., Elliou, J., Yu, H-F, Schmidl, S., Greiner, J., Gruber, G., Oates, S., Kobayashi, S., Zhang, B., Cummings, J. R., Filgas, R., Gehrels, N., Grupe, D., Kann, D. A., Klose, S., Krühler, Thomas Christian, Guelbenzu, A. Nicuesa, Rau, A., Rossi, A., Siegel, M., Schady, P., Sudilovsky, V., Tanga, M., and Varela, K.

Published
2014

92. Afterglow rebrightenings as a signature of a long-lasting central engine activity? The emblematic case of GRB 100814A

Author

Nardini, M., Elliott, J., Filgas, R., Schady, P., Greiner, J., Krühler, Thomas Christian, Klose, S., Afonso, P., Kann, D. A., Guelbenzu, A. Nicuesa, Olivares E, F., Rau, A., Rossi, A., Sudilovsky, V., Schmidl, S., Nardini, M., Elliott, J., Filgas, R., Schady, P., Greiner, J., Krühler, Thomas Christian, Klose, S., Afonso, P., Kann, D. A., Guelbenzu, A. Nicuesa, Olivares E, F., Rau, A., Rossi, A., Sudilovsky, V., and Schmidl, S.

Published
2014

93. A quiescent galaxy at the position of the long GRB 050219A

Author

Rossi, A., primary, Piranomonte, S., additional, Savaglio, S., additional, Palazzi, E., additional, Michałowski, M. J., additional, Klose, S., additional, Hunt, L. K., additional, Amati, L., additional, Elliott, J., additional, Greiner, J., additional, Guidorzi, C., additional, Japelj, J., additional, Kann, D. A., additional, Lo Faro, B., additional, Nicuesa Guelbenzu, A., additional, Schulze, S., additional, Vergani, S. D., additional, Arnold, L. A., additional, Covino, S., additional, D’Elia, V., additional, Ferrero, P., additional, Filgas, R., additional, Goldoni, P., additional, Küpcü Yoldaş, A., additional, Le Borgne, D., additional, Pian, E., additional, Schady, P., additional, and Stratta, G., additional

Published
2014
Full Text
View/download PDF

94. Afterglow rebrightenings as a signature of a long-lasting central engine activity?

Author

Nardini, M., primary, Elliott, J., additional, Filgas, R., additional, Schady, P., additional, Greiner, J., additional, Krühler, T., additional, Klose, S., additional, Afonso, P., additional, Kann, D. A., additional, Nicuesa Guelbenzu, A., additional, Olivares E., F., additional, Rau, A., additional, Rossi, A., additional, Sudilovsky, V., additional, and Schmidl, S., additional

Published
2014
Full Text
View/download PDF

95. Prompt emission of GRB 121217A from gamma-rays to the near-infrared

Author

Elliott, J., primary, Yu, H.-F., additional, Schmidl, S., additional, Greiner, J., additional, Gruber, D., additional, Oates, S., additional, Kobayashi, S., additional, Zhang, B., additional, Cummings, J. R., additional, Filgas, R., additional, Gehrels, N., additional, Grupe, D., additional, Kann, D. A., additional, Klose, S., additional, Krühler, T., additional, Nicuesa Guelbenzu, A., additional, Rau, A., additional, Rossi, A., additional, Siegel, M., additional, Schady, P., additional, Sudilovsky, V., additional, Tanga, M., additional, and Varela, K., additional

Published
2014
Full Text
View/download PDF

96. Multiwavelength observations of GRB 110731A : GeV emission from onset to afterglow

Author

Ackermann, M., Ajello, M., Asano, K., Baldini, L., Barbiellini, G., Baring, M. G., Bastieri, D., Bellazzini, R., Blandford, R. D., Bonamente, E., Borgland, A. W., Bottacini, E., Bregeon, J., Brigida, M., Bruel, P., Buehler, R., Buson, S., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Cecchi, C., Charles, E., Chaves, R. C. G., Chekhtman, A., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Conrad, J., Cutini, S., D'Ammando, F., De Angelis, A., De Palma, F., Dermer, C. D., Do Couto E Silva, E., Drell, P. S., Drlica-Wagner, A., Favuzzi, C., Fegan, S. J., Focke, W. B., Franckowiak, A., Fukazawa, Y., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Giglietto, N., Giordano, F., Giroletti, M., Glanzman, T., Godfrey, G., Granot, J., Greiner, J., Grenier, I. A., Grove, J. E., Guiriec, S., Hadasch, D., Hanabata, Y., Hayashida, M., Hays, E., Hughes, R. E., Jackson, Miranda S., Jogler, T., Jóhannesson, G., Johnson, A. S., Knödlseder, J., Kocevski, D., Kuss, M., Lande, J., Larsson, S., Latronico, L., Longo, F., Loparco, F., Lovellette, M. N., Lubrano, P., Mazziotta, M. N., McEnery, J. E., Mehault, J., Mészáros, P., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Monte, C., Monzani, M. E., Moretti, Elena, Morselli, A., Moskalenko, I. V., Murgia, S., Naumann-Godo, M., Norris, J. P., Nuss, E., Nymark, Tanja, Ohno, M., Ohsugi, T., Omodei, N., Orienti, M., Orlando, E., Paneque, D., Perkins, J. S., Pesce-Rollins, M., Piron, F., Pivato, G., Racusin, J. L., Rainò, S., Rando, R., Razzano, M., Razzaque, S., Reimer, A., Reimer, O., Romoli, C., Roth, M., Ryde, Felix, Sanchez, D. A., Sgrò, C., Siskind, E. J., Sonbas, E., Spinelli, P., Stamatikos, M., Takahashi, H., Tanaka, T., Thayer, J. G., Thayer, J. B., Tibaldo, L., Tinivella, M., Tosti, G., Troja, E., Usher, T. L., Vandenbroucke, J., Vasileiou, V., Vianello, G., Vitale, V., Waite, A. P., Winer, B. L., Wood, K. S., Yang, Z., Gruber, D., Bhat, P. N., Bissaldi, E., Briggs, M. S., Burgess, J. M., Connaughton, V., Foley, S., Kippen, R. M., Kouveliotou, C., McBreen, S., McGlynn, S., Paciesas, W. S., Pelassa, V., Preece, R., Rau, A., Van Der Horst, A. J., Von Kienlin, A., Kann, D. A., Filgas, R., Klose, S., Krühler, T., Fukui, A., Sako, T., Tristram, P. J., Oates, S. R., Ukwatta, T. N., Littlejohns, O., Ackermann, M., Ajello, M., Asano, K., Baldini, L., Barbiellini, G., Baring, M. G., Bastieri, D., Bellazzini, R., Blandford, R. D., Bonamente, E., Borgland, A. W., Bottacini, E., Bregeon, J., Brigida, M., Bruel, P., Buehler, R., Buson, S., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Cecchi, C., Charles, E., Chaves, R. C. G., Chekhtman, A., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Conrad, J., Cutini, S., D'Ammando, F., De Angelis, A., De Palma, F., Dermer, C. D., Do Couto E Silva, E., Drell, P. S., Drlica-Wagner, A., Favuzzi, C., Fegan, S. J., Focke, W. B., Franckowiak, A., Fukazawa, Y., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Giglietto, N., Giordano, F., Giroletti, M., Glanzman, T., Godfrey, G., Granot, J., Greiner, J., Grenier, I. A., Grove, J. E., Guiriec, S., Hadasch, D., Hanabata, Y., Hayashida, M., Hays, E., Hughes, R. E., Jackson, Miranda S., Jogler, T., Jóhannesson, G., Johnson, A. S., Knödlseder, J., Kocevski, D., Kuss, M., Lande, J., Larsson, S., Latronico, L., Longo, F., Loparco, F., Lovellette, M. N., Lubrano, P., Mazziotta, M. N., McEnery, J. E., Mehault, J., Mészáros, P., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Monte, C., Monzani, M. E., Moretti, Elena, Morselli, A., Moskalenko, I. V., Murgia, S., Naumann-Godo, M., Norris, J. P., Nuss, E., Nymark, Tanja, Ohno, M., Ohsugi, T., Omodei, N., Orienti, M., Orlando, E., Paneque, D., Perkins, J. S., Pesce-Rollins, M., Piron, F., Pivato, G., Racusin, J. L., Rainò, S., Rando, R., Razzano, M., Razzaque, S., Reimer, A., Reimer, O., Romoli, C., Roth, M., Ryde, Felix, Sanchez, D. A., Sgrò, C., Siskind, E. J., Sonbas, E., Spinelli, P., Stamatikos, M., Takahashi, H., Tanaka, T., Thayer, J. G., Thayer, J. B., Tibaldo, L., Tinivella, M., Tosti, G., Troja, E., Usher, T. L., Vandenbroucke, J., Vasileiou, V., Vianello, G., Vitale, V., Waite, A. P., Winer, B. L., Wood, K. S., Yang, Z., Gruber, D., Bhat, P. N., Bissaldi, E., Briggs, M. S., Burgess, J. M., Connaughton, V., Foley, S., Kippen, R. M., Kouveliotou, C., McBreen, S., McGlynn, S., Paciesas, W. S., Pelassa, V., Preece, R., Rau, A., Van Der Horst, A. J., Von Kienlin, A., Kann, D. A., Filgas, R., Klose, S., Krühler, T., Fukui, A., Sako, T., Tristram, P. J., Oates, S. R., Ukwatta, T. N., and Littlejohns, O.

Abstract

We report on the multiwavelength observations of the bright, long gamma-ray burst GRB 110731A, by the Fermi and Swift observatories, and by the MOA and GROND optical telescopes. The analysis of the prompt phase reveals that GRB 110731A shares many features with bright Large Area Telescope bursts observed by Fermi during the first three years on-orbit: a light curve with short time variability across the whole energy range during the prompt phase, delayed onset of the emission above 100 MeV, extra power-law component and temporally extended high-energy emission. In addition, this is the first GRB for which simultaneous GeV, X-ray, and optical data are available over multiple epochs beginning just after the trigger time and extending for more than 800 s, allowing temporal and spectral analysis in different epochs that favor emission from the forward shock in a wind-type medium. The observed temporally extended GeV emission is most likely part of the high-energy end of the afterglow emission. Both the single-zone pair transparency constraint for the prompt signal and the spectral and temporal analysis of the forward-shock afterglow emission independently lead to an estimate of the bulk Lorentz factor of the jet Γ ∼ 500-550., QC 20130215

Published
2013
Full Text
View/download PDF

97. Short GRB afterglows observed with GROND

Author

Nicuesa Guelbenzu, A., Klose, S., Rossi, A., Schmidl, S., Greiner, J., Kann, D. A., Elliott, J., Olivares E., F., Rau, A., Schady, P., Sudilovsky, V., Krühler, T., Ferrero, P., Schulze, S., Afonso, P. M J, Filgas, R., Nardini, M., Nicuesa Guelbenzu, A., Klose, S., Rossi, A., Schmidl, S., Greiner, J., Kann, D. A., Elliott, J., Olivares E., F., Rau, A., Schady, P., Sudilovsky, V., Krühler, T., Ferrero, P., Schulze, S., Afonso, P. M J, Filgas, R., and Nardini, M.

Abstract

We report on follow-up observations of 20 short-duration gamma-ray bursts (T90 < 2s) performed in g′r′i′z′JHKs with the Gamma-Ray Burst Optical Near-Infrared Detector (GROND) between mid-2007 and the end of 2010. This is the most homogeneous and comprehensive data set on GRB afterglow observations of short bursts. In three cases, GROND was on target within less than 10 min after the trigger, leading to the discovery of the afterglow of GRB 081226A and its faint underlying host galaxy. In addition, GROND was able to image the optical afterglow and follow the light curve evolution in five further cases: GRBs 090305, 090426, 090510, 090927, and 100117A. Three of the aforementioned six bursts with optical light curves show a break: GRBs 090426 and 090510 as well as GRB 090305. For GRB 090927, no break is seen in the optical/X-ray light curve until about 150 ks/600 ks after the burst. A decay slope of the optical afterglow of GRB 100117A could be measured. Using these data supplemented by about ten events taken from the literature, we compare the jet half-opening angles of long and short bursts. We find a tentative evidence that short bursts have wider opening angles than long bursts. However, the statistics are still very poor and follow-up observations of these events are therefore very important to gain as much observational data as possible., We report on follow-up observations of 20 short-duration gamma-ray bursts (T90 < 2s) performed in g′r′i′z′JHK s with the Gamma-Ray Burst Optical Near-Infrared Detector (GROND) between mid-2007 and the end of 2010. This is the most homogeneous and comprehensive data set on GRB afterglow observations of short bursts. In three cases, GROND was on target within less than 10 min after the trigger, leading to the discovery of the afterglow of GRB 081226A and its faint underlying host galaxy. In addition, GROND was able to image the optical afterglow and follow the light curve evolution in five further cases: GRBs 090305, 090426, 090510, 090927, and 100117A. Three of the aforementioned six bursts with optical light curves show a break: GRBs 090426 and 090510 as well as GRB 090305. For GRB 090927, no break is seen in the optical/X-ray light curve until about 150 ks/600 ks after the burst. A decay slope of the optical afterglow of GRB 100117A could be measured. Using these data supplemented by about ten events taken from the literature, we compare the jet half-opening angles of long and short bursts. We find a tentative evidence that short bursts have wider opening angles than long bursts. However, the statistics are still very poor and follow-up observations of these events are therefore very important to gain as much observational data as possible.

Published
2013

98. Clustering of galaxies around gamma-ray burst sight-lines

Author

Sudilovsky, V., Greiner, J., Rau, A., Salvato, M., Savaglio, S., Schady, P., Elliott, J., Vergani, S.D., Krühler, T., Kann, D.A., Klose, S., Rossi, A., Schmidl, S., Filgas, R., Sudilovsky, V., Greiner, J., Rau, A., Salvato, M., Savaglio, S., Schady, P., Elliott, J., Vergani, S.D., Krühler, T., Kann, D.A., Klose, S., Rossi, A., Schmidl, S., and Filgas, R.

Abstract

There is evidence of an overdensity of strong intervening MgII absorption line systems distributed along the lines of sight toward gamma-ray burst (GRB) afterglows relative to quasar sight-lines. If this excess is real, one should also expect an overdensity of field galaxies around GRB sight-lines, as strong MgII tends to trace these sources. In this work, we test this expectation by calculating the two point angular correlation function of galaxies within 120'' (~470 h Kpc470h71-1Kpc at z ~ 0.4) of GRB afterglows. We compare the gamma-ray burst optical and near-infrared detector (GROND) GRB afterglow sample-one of the largest and most homogeneous samples of GRB fields-with galaxies and active galactic nuclei found in the COSMOS-30 photometric catalog. We find no significant signal of anomalous clustering of galaxies at an estimated median redshift of z ~ 0.3 around GRB sight-lines, down to K <19.3. This result is contrary to the expectations from the MgII excess derived from GRB afterglow spectroscopy, although many confirmed galaxy counterparts to MgII absorbers may be too faint to detect in our sample-especially those at z > 1. We note that the addition of higher sensitivity Spitzer/IRAC or HST/WFC3 data for even a subset of our sample would increase this survey's depth by several orders of magnitude, simultaneously increasing statistics and enabling the investigation of a much larger redshift space.

Published
2013

99. The fast evolution of SN 2010bh associated with XRF 100316D

Author

Olivares, E.F., Greiner, J., Sschady, P., Rau, A., Krühler, Thomas Christian, Afonso, P.M.J., Updike, A.C., Nardini, M., Filgas, R., Nicuesa Guelbenzu, A., Olivares, E.F., Greiner, J., Sschady, P., Rau, A., Krühler, Thomas Christian, Afonso, P.M.J., Updike, A.C., Nardini, M., Filgas, R., and Nicuesa Guelbenzu, A.

Published
2012

100. Detailed optical and near-infrared polarimetry, spectroscopy and broad-band photometry of the afterglow of GRB 091018: Polarization evolution

Author

Wierserma, K., Curran, Peter, Kruehler, T., Melandri, A., Rol, E., Starling, R., Tanvir, N., van der Horst, A., Covino, S., Fynbo, J., Goldoni, P., Gorosabel, J., Hjorth, J., Klose, S., Mundell, C., O'Brien, P., Palazzi, E., Wijers, R., D'Elia, V., Evans, P., Filgas, R., Gomboc, A., Greiner, J., Guidorzi, C., Kaper, L., Kobayashi, S., Kouveliotou, C., Levan, A., Rossi, A., Rowlinson, A., Steele, I., Postigo, A., Vergani, S., Wierserma, K., Curran, Peter, Kruehler, T., Melandri, A., Rol, E., Starling, R., Tanvir, N., van der Horst, A., Covino, S., Fynbo, J., Goldoni, P., Gorosabel, J., Hjorth, J., Klose, S., Mundell, C., O'Brien, P., Palazzi, E., Wijers, R., D'Elia, V., Evans, P., Filgas, R., Gomboc, A., Greiner, J., Guidorzi, C., Kaper, L., Kobayashi, S., Kouveliotou, C., Levan, A., Rossi, A., Rowlinson, A., Steele, I., Postigo, A., and Vergani, S.

Abstract

Follow-up observations of large numbers of gamma-ray burst (GRB) afterglows, facilitated by the Swift satellite, have produced a large sample of spectral energy distributions and light curves, from which their basic micro- and macro-physical parameters can in principle be derived. However, a number of phenomena have been observed that defy explanation by simple versions of the standard fireball model, leading to a variety of new models. Polarimetry can be a major independent diagnostic of afterglow physics, probing the magnetic field properties and internal structure of the GRB jets. In this paper we present the first high-quality multi-night polarimetric light curve of a Swift GRB afterglow, aimed at providing a well-calibrated data set of a typical afterglow to serve as a benchmark system for modelling afterglow polarization behaviour. In particular, our data set of the afterglow of GRB 091018 (at redshift z = 0.971) comprises optical linear polarimetry (R band, 0.13–2.3 d after burst); circular polarimetry (R band) and near-infrared linear polarimetry (Ks band). We add to that high-quality optical and near-infrared broad-band light curves and spectral energy distributions as well as afterglow spectroscopy. The linear polarization varies between 0 and 3 per cent, with both long and short time-scale variability visible. We find an achromatic break in the afterglow light curve, which corresponds to features in the polarimetric curve. We find that the data can be reproduced by jet break models only if an additional polarized component of unknown nature is present in the polarimetric curve. We probe the ordered magnetic field component in the afterglow through our deep circular polarimetry, finding Pcirc < 0.15 per cent (2σ), the deepest limit yet for a GRB afterglow, suggesting ordered fields are weak, if at all present. Our simultaneous R- and Ks-band polarimetry shows that dust-induced polarization in the host galaxy is likely negligible.

Published
2012

Catalog

Books, media, physical & digital resources
See catalog results