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5 results on '"Guirec, S."'

1. The First Fermi-LAT Solar Flare Catalog Appendix

Author

Ajello, M, Baldini, L, Bastieri, D, Bellazzini, R, Berretta, A, Bissaldi, E, Blandford, R.D, Bonino, R, Bruel, P, Cameron, R, Caputo, R, Cavazzuti, E, Cheung, C.C, Chiaro, G, Costantin, D, Cutini, S, D'Ammando, F, De Palma, F, Di Lalla, N, Dirirsa, F, Di Venere, L, Fegan, S.J, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Giordano, F, Giroletti, M, Green, D, Guirec, S, Hayes, E, Hewitt, J.W, Horan, D, Johannesson, G, Kovac'evic, M, Kuss, M, Larsson, S, Latronico, L, Li, J, Longo, F, Lovellette, M.N, Lubrano, P, Maldera, S, Manfreda, A, Marti-Devesa, G, Mazziotta, M.N, Mereu, I, Michelson, P.F, Mizuno, T, Monzani, M.E, Morselli, A, Moskalenko, I, Negro, M, Omodei, N, Orienti, M, Orlando, E, Paneque, D, Pei, Z, Persic, M, Pesce-Rollins, M, Petrosian, V, Piron, F, Porter, T.A, Principe, G, Racusin, J.L, Raino', S, Rando, R, Rani, B, Razzano, M, Razzaque, S, Reimer, A, Reimer, O, Serini, D, Sgro', C, Siskind, E.J, Spandre, G, Spinelli, P, Tak, D, Troja, E, Valverde, J, Wood, K, and Zaharijas, G

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Physics::Space Physics, Astrophysics::Solar and Stellar Astrophysics
Abstract

We present the appendix of the First Fermi-Large Area Telescope (LAT) Solar flare catalog covering the 24thSolar cycle. The catalog (published in ApJS) contains 45 Fermi-LAT Solar flares (FLSFs) with emission in theγ-ray energy band (30 MeV -10 GeV) detected with a significance ≥5σ over the years 2010-2018. A subsample containing 37 of these flares exhibit delayed emission beyond the prompt-impulsive hard X-ray phase with 21 flares showing delayed emission lasting more than two hours. No prompt-impulsive emission is detected in four of these flares. We also report the first time observations of GeV emission from 3 flares originating from Active Regions located behind the limb (BTL) of the visible Solar disk. We report the light curves, spectra, best proton index and localization (when possible) for all the FLSFs and correlations with Solar multi-wavelength phenomena. The gamma-ray spectra is consistent with the decay of pions produced by >300 MeV protons. The work presented in the First Fermi Solar Flare Catalog contains the largest sample of high-energy gamma-ray flares ever reported and provides the unique opportunity to perform population/correlation studies on the different phases of the flare and thus allowing to open a new window in solar physics. This work is on behalf of the Fermi Large Area Telescope Collaboration. The First Fermi LAT Solar Flare Catalog has been accepted for publication on ApJS.

Published
2020
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2. The Imprint of the Extragalactic Background Light in the Gamma-Ray Spectra of Blazars

Author

Ackermann, M, Ajello, M, Allafort, A, Schady, P, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Bellazzini, R, Blandford, R. D, Bloom, E. D, Borgland, A. W, Bottacini, E, Bouvier, A, Bregeon, J, Brigida, M, Bruel, P, Buehler, R, Gehrels, N, Guirec, S, Hays, E, McEnery, J. E, Perkins, J. S, Scargle, J. D, and Troja, E

Subjects
Astrophysics
Abstract

The light emitted by stars and accreting compact objects through the history of the universe is encoded in the intensity of the extragalactic background light (EBL). Knowledge of the EBL isimportant to understand the nature of star formation and galaxy evolution, but direct measurements of the EBL are limited by galactic and other foreground emissions. Here, we report an absorption feature seen in the combined spectra of a sample of gamma-ray blazars out to a redshift of z approx. 1.6. This feature is caused by attenuation of gamma rays by the EBL at optical to ultraviolet frequencies and allowed us to measure the EBL flux density in this frequency band.

Published
2012
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3. Constraining the High-Energy Emission from Gamma-Ray Bursts with Fermi

Author

Gehrels, Neil, Harding, A. K, Hays, E, Racusin, J. L, Sonbas, E, Stamatikos, M, and Guirec, S

Subjects
Astronomy
Abstract

We examine 288 GRBs detected by the Fermi Gamma-ray Space Telescope's Gamma-ray Burst Monitor (GBM) that fell within the field-of-view of Fermi's Large Area Telescope (LAT) during the first 2.5 years of observations, which showed no evidence for emission above 100 MeV. We report the photon flux upper limits in the 0.1-10 GeV range during the prompt emission phase as well as for fixed 30 s and 100 s integrations starting from the trigger time for each burst. We compare these limits with the fluxes that would be expected from extrapolations of spectral fits presented in the first GBM spectral catalog and infer that roughly half of the GBM-detected bursts either require spectral breaks between the GBM and LAT energy bands or have intrinsically steeper spectra above the peak of the nuF(sub v) spectra (E(sub pk)). In order to distinguish between these two scenarios, we perform joint GBM and LAT spectral fits to the 30 brightest GBM-detected bursts and find that a majority of these bursts are indeed softer above E(sub pk) than would be inferred from fitting the GBM data alone. Approximately 20% of this spectroscopic subsample show statistically significant evidence for a cut-off in their high-energy spectra, which if assumed to be due to gamma gamma attenuation, places limits on the maximum Lorentz factor associated with the relativistic outflow producing this emission. All of these latter bursts have maximum Lorentz factor estimates that are well below the minimum Lorentz factors calculated for LAT-detected GRBs, revealing a wide distribution in the bulk Lorentz factor of GRB outflows and indicating that LAT-detected bursts may represent the high end of this distribution.

Published
2012

4. Constraining The High-Energy Emission From Gamma-Ray Bursts With Fermi

Author

Ackermann, M., Ajello, M., Baldini, L., Barbiellini, G., Baring, M. G., Bechtol, K., Bellazzini, R., Blandford, R. D., Bloom, E. D., Bonamente, E., Borgland, A. W., Bottacini, E., Bouvier, A., Brigida, M., Buehler, R., Buson, S., Caliandro, G. A., Cameron, R. A., Cecchi, C., Charles, E., Chekhtman, A., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Cutini, S., D'Ammando, F., de Palma, F., Dermer, C. D., do Couto e Silva, E., Drell, P. S., Drlica-Wagner, A., Favuzzi, C., Fukazawa, Y., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giglietto, N., Giordano, F., Giroletti, M., Glanzman, T., Granot, J., Grenier, I. A., Grove, J. E., Hadasch, D., Hanabata, Y., Harding, A. K., Hays, E., Horan, D., Johannesson, G., Kataoka, J., Knoedlseder, J., Kocevski, D., Kuss, M., Lande, J., Longo, F., Loparco, F., Lovellette, M. N., Lubrano, P., Mazziotta, M. N., McEnery, J., McGlynn, S., Michelson, P. F., Mitthumsiri, W., Monzani, M. E., Moretti, Elena, Morselli, A., Moskalenko, I. V., Murgia, S., Naumann-Godo, M., Norris, J. P., Nuss, E., Nymark, Tanja, Ohsugi, T., Okumura, A., Omodei, N., Orlando, E., Panetta, J. H., Parent, D., Pelassa, V., Pesce-Rollins, M., Piron, F., Pivato, G., Racusin, J. L., Raino, S., Rando, R., Razzaque, S., Reimer, A., Reimer, O., Ritz, S., Ryde, Felix, Sgro, C., Siskind, E. J., Sonbas, E., Spandre, G., Spinelli, P., Stamatikos, M., Stawarz, Eukasz, Suson, D. J., Takahashi, H., Tanaka, T., Thayer, J. G., Thayer, J. B., Tibaldo, L., Tinivella, M., Tosti, G., Uehara, T., Vandenbroucke, J., Vasileiou, V., Vianello, G., Vitale, V., Waite, A. P., Connaughton, V., Briggs, M. S., Guirec, S., Goldstein, A., Burgess, J. M., Bhat, P. N., Bissaldi, E., Camero-Arranz, A., Fishman, J., Fitzpatrick, G., Foley, S., Gruber, D., Jenke, P., Kippen, R. M., Kouveliotou, C., McBreen, S., Meegan, C., Paciesas, W. S., Preece, R., Rau, A., Tierney, D., van der Horst, A. J., von Kienlin, A., Wilson-Hodge, C., Xiong, S., Ackermann, M., Ajello, M., Baldini, L., Barbiellini, G., Baring, M. G., Bechtol, K., Bellazzini, R., Blandford, R. D., Bloom, E. D., Bonamente, E., Borgland, A. W., Bottacini, E., Bouvier, A., Brigida, M., Buehler, R., Buson, S., Caliandro, G. A., Cameron, R. A., Cecchi, C., Charles, E., Chekhtman, A., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Cutini, S., D'Ammando, F., de Palma, F., Dermer, C. D., do Couto e Silva, E., Drell, P. S., Drlica-Wagner, A., Favuzzi, C., Fukazawa, Y., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giglietto, N., Giordano, F., Giroletti, M., Glanzman, T., Granot, J., Grenier, I. A., Grove, J. E., Hadasch, D., Hanabata, Y., Harding, A. K., Hays, E., Horan, D., Johannesson, G., Kataoka, J., Knoedlseder, J., Kocevski, D., Kuss, M., Lande, J., Longo, F., Loparco, F., Lovellette, M. N., Lubrano, P., Mazziotta, M. N., McEnery, J., McGlynn, S., Michelson, P. F., Mitthumsiri, W., Monzani, M. E., Moretti, Elena, Morselli, A., Moskalenko, I. V., Murgia, S., Naumann-Godo, M., Norris, J. P., Nuss, E., Nymark, Tanja, Ohsugi, T., Okumura, A., Omodei, N., Orlando, E., Panetta, J. H., Parent, D., Pelassa, V., Pesce-Rollins, M., Piron, F., Pivato, G., Racusin, J. L., Raino, S., Rando, R., Razzaque, S., Reimer, A., Reimer, O., Ritz, S., Ryde, Felix, Sgro, C., Siskind, E. J., Sonbas, E., Spandre, G., Spinelli, P., Stamatikos, M., Stawarz, Eukasz, Suson, D. J., Takahashi, H., Tanaka, T., Thayer, J. G., Thayer, J. B., Tibaldo, L., Tinivella, M., Tosti, G., Uehara, T., Vandenbroucke, J., Vasileiou, V., Vianello, G., Vitale, V., Waite, A. P., Connaughton, V., Briggs, M. S., Guirec, S., Goldstein, A., Burgess, J. M., Bhat, P. N., Bissaldi, E., Camero-Arranz, A., Fishman, J., Fitzpatrick, G., Foley, S., Gruber, D., Jenke, P., Kippen, R. M., Kouveliotou, C., McBreen, S., Meegan, C., Paciesas, W. S., Preece, R., Rau, A., Tierney, D., van der Horst, A. J., von Kienlin, A., Wilson-Hodge, C., and Xiong, S.

Abstract

We examine 288 gamma-ray bursts (GRBs) detected by the Fermi Gamma-ray Space Telescope's Gamma-ray Burst Monitor (GBM) that fell within the field of view of Fermi's Large Area Telescope (LAT) during the first 2.5 years of observations, which showed no evidence for emission above 100 MeV. We report the photon flux upper limits in the 0.1-10 GeV range during the prompt emission phase as well as for fixed 30 s and 100 s integrations starting from the trigger time for each burst. We compare these limits with the fluxes that would be expected from extrapolations of spectral fits presented in the first GBM spectral catalog and infer that roughly half of the GBM-detected bursts either require spectral breaks between the GBM and LAT energy bands or have intrinsically steeper spectra above the peak of the nu F-nu spectra (E-pk). In order to distinguish between these two scenarios, we perform joint GBM and LAT spectral fits to the 30 brightest GBM-detected bursts and find that a majority of these bursts are indeed softer above E-pk than would be inferred from fitting the GBM data alone. Approximately 20% of this spectroscopic subsample show statistically significant evidence for a cutoff in their high-energy spectra, which if assumed to be due to gamma gamma attenuation, places limits on the maximum Lorentz factor associated with the relativistic outflow producing this emission. All of these latter bursts have maximum Lorentz factor estimates that are well below the minimum Lorentz factors calculated for LAT-detected GRBs, revealing a wide distribution in the bulk Lorentz factor of GRB outflows and indicating that LAT-detected bursts may represent the high end of this distribution., QC 20120907

Published
2012
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5. Constraining the High-energy Emission from Gamma-Ray Bursts with Fermi

Author

The, Fermi Large Area Telescope Team, Ackermann, M., Ajello, M., Baldini, L., Barbiellini, G., Baring, M. G., Bechtol, K., Bellazzini, R., Blandford, R. D., Bloom, E. D., Bonamente, E., Borgland, A. W., Bottacini, E., Bouvier, A., Brigida, M., Buehler, R., Buson, S., Caliandro, G. A., Cameron, R. A., Cecchi, C., Charles, E., Chekhtman, A., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Cutini, S., D'Ammando, F., de, Palma F., Dermer, C. D., do, Couto e Silva E., Drell, P. S., Drlica-Wagner, A., Favuzzi, C., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giglietto, N., Giordano, F., Giroletti, M., Glanzman, T., Granot, J., Grenier, I. A., Grove, J. E., Hadasch, D., Harding, A. K., Hays, E., Horan, D., Johannesson, G., Knodlseder, J., Kocevski, D., Kuss, M., Lande, J., Longo, F., Loparco, F., Lovellette, M. N., Lubrano, P., Mazziotta, M. N., McEnery, J., McGlynn, S., Michelson, P. F., Mitthumsiri, W., Monzani, M. E., Moretti, E., Morselli, A., Moskalenko, I. V., Murgia, S., Naumann-Godo, M., Norris, J. P., Nuss, E., Nymark, T., Omodei, N., Orlando, E., Panetta, J. H., Parent, D., Pelassa, V., Pesce-Rollins, M., Piron, F., Pivato, G., Racusin, J. L., Raino, S., Rando, R., Razzaque, S., Reimer, A., Reimer, O., Ritz, S., Ryde, F., Sgro, C., Siskind, E. J., Sonbas, E., Spandre, G., Spinelli, P., Stamatikos, M., Stawarz, Lukasz, Fukazawa, Yasushi, Hanabata, Yoshitaka, Kataoka, Jun, Ohsugi, Takashi, Okumura, Akira, High Energy Astrophys. & Astropart. Phys (API, FNWI), Ackermann M, Ajello M, Baldini L, Barbiellini G, Baring MG, Bechtol K, Bellazzini R, Blandford RD, Bloom ED, Bonamente E, Borgland AW, Bottacini E, Bouvier A, Brigida M, Buehler R, Buson S, Caliandro GA, Cameron RA, Cecchi C, Charles E, Chekhtman A, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Cutini S, DAmmando F, de Palma F, Dermer CD, Silva EDE, Drell PS, Drlica-Wagner A, Favuzzi C, Fukazawa Y, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Granot J, Grenier IA, Grove JE, Hadasch D, Hanabata Y, Harding AK, Hays E, Horan D, Johannesson G, Kataoka J, Knodlseder J, Kocevski D, Kuss M, Lande J, Longo F, Loparco F, Lovellette MN, Lubrano P, Mazziotta MN, McEnery J, McGlynn S, Michelson PF, Mitthumsiri W, Monzani ME, Moretti E, Morselli A, Moskalenko IV, Murgia S, Naumann-Godo M, Norris JP, Nuss E, Nymark T, Ohsugi T, Okumura A, Omodei N, Orlando E, Panetta JH, Parent D, Pelassa V, Pesce-Rollins M, Piron F, Pivato G, Racusin JL, Raino S, Rando R, Razzaque S, Reimer A, Reimer O, Ritz S, Ryde F, Sgro C, Siskind EJ, Sonbas E, Spandre G, Spinelli P, Stamatikos M, Stawarz E, Suson DJ, Takahashi H, Tanaka T, Thayer JG, Thayer JB, Tibaldo L, Tinivella M, Tosti G, Uehara T, Vandenbroucke J, Vasileiou V, Vianello G, Vitale V, Waite AP, Connaughton V, Briggs MS, Guirec S, Goldstein A, Burgess JM, Bhat PN, Bissaldi E, Camero-Arranz A, Fishman J, Fitzpatrick G, Foley S, Gruber D, Jenke P, Kippen RM, Kouveliotou C, McBreen S, Meegan C, Paciesas WS, Preece R, Rau A, Tierney D, van der Horst AJ, von Kienlin A, Wilson-Hodge C, Xiong S, Ackermann, M., Ajello, M., Baldini, L., BARBIELLINI AMIDEI, Guido, Baring, M. G., Bechtol, K., Bellazzini, R., Blandford, R. D., Bloom, E. D., Bonamente, E., Borgland, A. W., Bottacini, E., Bouvier, A., Brigida, M., Buehler, R., Buson, S., Caliandro, G. A., Cameron, R. A., Cecchi, C., Charles, E., Chekhtman, A., Chiang, J., Ciprini, S., Claus, R., Cohen Tanugi, J., Cutini, S., D'Ammando, F., Palma, F., Dermer, C. D., E. d. C., Drell, P. S., Drlica Wagner, A., Favuzzi, C., Fukazawa, Y., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giglietto, N., Giordano, F., Giroletti, M., Glanzman, T., Granot, J., Grenier, I. A., Grove, J. E., Hadasch, D., Hanabata, Y., Harding, A. K., Hays, E., Horan, D., Johannesson, G., Kataoka, J., Kn\odlseder, J., Kocevski, D., Kuss, M., Lande, J., Longo, Francesco, Loparco, F., Lovellette, M. N., Lubrano, P., Mazziotta, M. N., Mcenery, J., Mcglynn, S., Michelson, P. F., Mitthumsiri, W., Monzani, M. E., Moretti, E., Morselli, A., Moskalenko, I. V., Murgia, S., Naumann Godo, M., Norris, J. P., Nuss, E., Nymark, T., Ohsugi, T., Okumura, A., Omodei, N., Orlando, E., Panetta, J. H., Parent, D., Pelassa, V., Pesce Rollins, M., Piron, F., Pivato, G., Racusin, J. L., Rain\`o, S., Rando, R., Razzaque, S., Reimer, A., Reimer, O., Ritz, S., Ryde, F., Sgr\`o, C., Siskind, E. J., Sonbas, E., Spandre, G., Spinelli, P., Stamatikos, M., Stawarz, ., Suson, D. J., Takahashi, H., Tanaka, T., Thayer, J. G., Thayer, J. B., Tibaldo, L., Tinivella, M., Tosti, G., Uehara, T., Vandenbroucke, J., Vasileiou, V., Vianello, G., Vitale, V., Waite, A. P., Gamma ray, . F., Connaughton, V., Briggs, M. S., Guirec, S., Goldstein, A., Burgess, J. M., Bhat, P. N., Bissaldi, Elisabetta, Camero Arranz, A., Fishman, J., Fitzpatrick, G., Foley, S., Gruber, D., Jenke, P., Kippen, R. M., Kouveliotou, C., Mcbreen, S., Meegan, C., Paciesas, W. S., Preece, R., Rau, A., Tierney, D., Van, A. J., Kienlin, A., Wilson Hodge, C., and Xiong, S.

Subjects
Astrophysics::High Energy Astrophysical Phenomena, gamma-ray burst: general, Astrophysics, general [gamma-ray burst], Astronomical spectroscopy, Spectral line, symbols.namesake, Gamma rays: general, Physics, Astronomy, Astronomy and Astrophysics, Spectral bands, Gamma-ray astronomy, gamma rays: general, Spectral component, Space and Planetary Science, Lorentz factor, gamma-ray burst: general – gamma rays: general, symbols, ddc:520, Astrophysics - High Energy Astrophysical Phenomena, Gamma-ray burst, general [gamma rays], Astrophysics - Cosmology and Nongalactic Astrophysics, Fermi Gamma-ray Space Telescope
Abstract

著者人数: 139名, Accepted: 2012-05-22, 資料番号: SA1004166000

Published
2012
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