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15 results on '"Nousek, J"'

1. Relativistic ejecta from X-ray flash XRF 060218 and the rate of cosmic explosions

Author

Soderberg, A. M., Kulkarni, S. R., Nakar, E., Berger, E., Cameron, P. B., Fox, D. B., Frail, D., Gal-Yam, A., Sari, R., Cenko, S. B., Kasliwal, M., Chevalier, R. A., Piran, T., Price, P. A., Schmidt, B. P., Pooley, G., Moon, D.-S., Penprase, B. E., Ofek, E., Rau, A., Gehrels, N., Nousek, J. A., Burrows, D. N., Persson, S. E., and McCarthy, P. J.

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): A. M. Soderberg (corresponding author) [1]; S. R. Kulkarni [1]; E. Nakar [2]; E. Berger [3]; P. B. Cameron [1]; D. B. Fox [4]; D. Frail [5]; A. Gal-Yam [...]

Published
2006
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2. A short γ-ray burst apparently associated with an elliptical galaxy at redshift z = 0.225

Author

Gehrels, N., Sarazin, C. L., O'Brien, P. T., Zhang, B., Barbier, L., Barthelmy, S. D., Blustin, A., Burrows, D. N., Cannizzo, J., Cummings, J. R., Goad, M., Holland, S. T., Hurkett, C. P., Kennea, J. A., Levan, A., Markwardt, C. B., Mason, K. O., Meszaros, P., Page, M., Palmer, D. M., Rol, E., Sakamoto, T., Willingale, R., Angelini, L., Beardmore, A., Boyd, P. T., Breeveld, A., Campana, S., Chester, M. M., Chincarini, G., Cominsky, L. R., Cusumano, G., de Pasquale, M., Fenimore, E. E., Giommi, P., Gronwall, C., Grupe, D., Hill, J. E., Hinshaw, D., Hjorth, J., Hullinger, D., Hurley, K. C., Klose, S., Kobayashi, S., Kouveliotou, C., Krimm, H. A., Mangano, V., Marshall, F. E., McGowan, K., Moretti, A., Mushotzky, R. F., Nakazawa, K., Norris, J. P., Nousek, J. A., Osborne, J. P., Page, K., Parsons, A. M., Patel, S., Perri, M., Poole, T., Romano, P., Roming, P. W. A., Rosen, S., Sato, G., Schady, P., Smale, A. P., Sollerman, J., Starling, R., Still, M., Suzuki, M., Tagliaferri, G., Takahashi, T., Tashiro, M., Tueller, J., Wells, A. A., White, N. E., and Wijers, R. A. M. J.

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): N. Gehrels (corresponding author) [1]; C. L. Sarazin [2]; P. T. O'Brien [3]; B. Zhang [4]; L. Barbier [1]; S. D. Barthelmy [1]; A. Blustin [5]; D. N. Burrows [...]

Published
2005
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3. An unexpectedly rapid decline in the X-ray afterglow emission of long γ-ray bursts

Author

Tagliaferri, G., Goad, M., Chincarini, G., Moretti, A., Campana, S., Burrows, D. N., Perri, M., Barthelmy, S. D., Gehrels, N., Krimm, H., Sakamoto, T., Kumar, P., Meszaros, P. I., Kobayashi, S., Zhang, B., Angelini, L., Banat, P., Beardmore, A. P., Capalbi, M., Covino, S., Cusumano, G., Giommi, P., Godet, O., Hill, J. E., Kennea, J. A., Mangano, V., Morris, D. C., Nousek, J. A., O'Brien, P. T., Osborne, J. P., Pagani, C., Page, K. L., Romano, P., Stella, L., and Wells, A.

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): G. Tagliaferri (corresponding author) [1]; M. Goad [2]; G. Chincarini [1, 3]; A. Moretti [1]; S. Campana [1]; D. N. Burrows [4]; M. Perri [5]; S. D. Barthelmy [6]; [...]

Published
2005
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4. GRB 090423 at a redshift of z ≈ 8.1

Author

Salvaterra, R., Valle, Della M., Campana, S., Chincarini, G., Covino, S., D’Avanzo, P., Fernández-Soto, A., Guidorzi, C., Mannucci, F., Margutti, R., Thöne, C. C., Antonelli, L. A., Barthelmy, S. D., De Pasquale, M., D’Elia, V., Fiore, F., Fugazza, D., Hunt, L. K., Maiorano, E., Marinoni, S., Marshall, F. E., Molinari, E., Nousek, J., Pian, E., Racusin, J. L., Stella, L., Amati, L., Andreuzzi, G., Cusumano, G., Fenimore, E. E., Ferrero, P., Giommi, P., Guetta, D., Holland, S. T., Hurley, K., Israel, G. L., Mao, J., Markwardt, C. B., Masetti, N., Pagani, C., Palazzi, E., Palmer, D. M., Piranomonte, S., Tagliaferri, G., and Testa, V.

Published
2009
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5. A new γ-ray burst classification scheme from GRB 060614

Author

Gehrels, N., Norris, J. P., Barthelmy, S. D., Granot, J., Kaneko, Y., Kouveliotou, C., Markwardt, C. B., Mészáros, P., Nakar, E., Nousek, J. A., O'Brien, P. T., Page, M., Palmer, D. M., Parsons, A. M., Roming, P. W. A., Sakamoto, T., Sarazin, C. L., Schady, P., Stamatikos, M., and Woosley, S. E.

Published
2006

6. The association of GRB 060218 with a supernova and the evolution of the shock wave

Author

Campana, S., Mangano, V., Blustin, A. J., Brown, P., Burrows, D. N., Chincarini, G., Cummings, J. R., Cusumano, G., Della Valle, M., Malesani, D., Mészáros, P., Nousek, J. A., Page, M., Sakamoto, T., Waxman, E., Zhang, B., Dai, Z. G., Gehrels, N., Immler, S., Marshall, F. E., Mason, K. O., Moretti, A., O'Brien, P. T., Osborne, J. P., Page, K. L., Romano, P., Roming, P. W. A., Tagliaferri, G., Cominsky, L. R., Giommi, P., Godet, O., Kennea, J. A., Krimm, H., Angelini, L., Barthelmy, S. D., Boyd, P. T., Palmer, D. M., Wells, A. A., and White, N. E.

Published
2006

7. GAMMA-RAY BURSTS: Huge explosion in the early Universe

Author

Cusumano, G., Mangano, V., Chincarini, G., Panaitescu, A., Burrows, D. N., La Parola, V., Sakamoto, T., Campana, S., Mineo, T., Tagliaferri, G., Angelini, L., Barthelemy, S. D., Beardmore, A. P., Boyd, P. T., Cominsky, L. R., Gronwall, C., Fenimore, E. E., Gehrels, N., Giommi, P., Goad, M., Hurley, K., Kennea, J. A., Mason, K. O., Marshall, F., Mészáros, P., Nousek, J. A., Osborne, J. P., Palmer, D. M., Roming, P. W. A., Wells, A., White, N. E., and Zhang, B.

Published
2006

8. An origin for short γ-ray bursts unassociated with current star formation

Author

Barthelmy, S. D., Chincarini, G., Burrows, D. N., Gehrels, N., Covino, S., Moretti, A., Romano, P., O'Brien, P. T., Sarazin, C. L., Kouveliotou, C., Goad, M., Vaughan, S., Tagliaferri, G., Zhang, B., Antonelli, L. A., Campana, S., Cummings, J. R., D'Avanzo, P., Davies, M. B., Giommi, P., Grupe, D., Kaneko, Y., Kennea, J. A., King, A., Kobayashi, S., Melandri, A., Meszaros, P., Nousek, J. A., Patel, S., Sakamoto, T., and Wijers, R. A. M. J.

Published
2005

9. A giant γ-ray flare from the magnetar SGR 1806−20

Author

Palmer, D. M., Barthelmy, S., Gehrels, N., Kippen, R. M., Cayton, T., Kouveliotou, C., Eichler, D., Wijers, R. A. M. J., Woods, P. M., Granot, J., Lyubarsky, Y. E., Ramirez-Ruiz, E., Barbier, L., Chester, M., Cummings, J., Fenimore, E. E., Finger, M. H., Gaensler, B. M., Hullinger, D., Krimm, H., Markwardt, C. B., Nousek, J. A., Parsons, A., Patel, S., Sakamoto, T., Sato, G., Suzuki, M., and Tueller, J.

Published
2005

10. The peculiar X-ray and radio star AS431

Author

Caillault, J.-P, Chanan, G. A, Helfand, D. J, Patterson, J, Nousek, J. A, Takalo, L. O, Bothun, G. D, and Becker, R. H

Subjects
Astrophysics
Abstract

Einstein observations are reported which reveal that the highly reddened emission-line star AS431 has a highly absorbed X-ray spectrum and a relatively strong intrinsic flux of 5 x 10 to the -12th erg/sq cm/s or more. Observations at 20 cm and 6 cm with the National Radio Astronomy Observatory Very Large Array are also reported which show that AS431 is also a moderately strong radio source (about 35 mJy). These data, together with optical and infrared observations, suggest a model in which both the radio and X-ray emissions arise in a chaotic stellar wind emerging from a single luminous Wolf-Rayet star.

Published
1985
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11. Huge explosion in the early Universe

Author

Cusumano, G., primary, Mangano, V., additional, Chincarini, G., additional, Panaitescu, A., additional, Burrows, D. N., additional, Parola, V. La, additional, Sakamoto, T., additional, Campana, S., additional, Mineo, T., additional, Tagliaferri, G., additional, Angelini, L., additional, Barthelemy, S. D., additional, Beardmore, A. P., additional, Boyd, P. T., additional, Cominsky, L. R., additional, Gronwall, C., additional, Fenimore, E. E., additional, Gehrels, N., additional, Giommi, P., additional, Goad, M., additional, Hurley, K., additional, Kennea, J. A., additional, Mason, K. O., additional, Marshall, F., additional, Mészáros, P., additional, Nousek, J. A., additional, Osborne, J. P., additional, Palmer, D. M., additional, Roming, P. W. A., additional, Wells, A., additional, White, N. E., additional, and Zhang, B., additional

Published
2006
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12. GRB 090423 at a redshift of z approximately 8.1.

Author

Salvaterra R, Valle MD, Campana S, Chincarini G, Covino S, D'Avanzo P, Fernández-Soto A, Guidorzi C, Mannucci F, Margutti R, Thöne CC, Antonelli LA, Barthelmy SD, De Pasquale M, D'Elia V, Fiore F, Fugazza D, Hunt LK, Maiorano E, Marinoni S, Marshall FE, Molinari E, Nousek J, Pian E, Racusin JL, Stella L, Amati L, Andreuzzi G, Cusumano G, Fenimore EE, Ferrero P, Giommi P, Guetta D, Holland ST, Hurley K, Israel GL, Mao J, Markwardt CB, Masetti N, Pagani C, Palazzi E, Palmer DM, Piranomonte S, Tagliaferri G, and Testa V

Abstract

Gamma-ray bursts (GRBs) are produced by rare types of massive stellar explosion. Their rapidly fading afterglows are often bright enough at optical wavelengths that they are detectable at cosmological distances. Hitherto, the highest known redshift for a GRB was z = 6.7 (ref. 1), for GRB 080913, and for a galaxy was z = 6.96 (ref. 2). Here we report observations of GRB 090423 and the near-infrared spectroscopic measurement of its redshift, z = 8.1(-0.3)(+0.1). This burst happened when the Universe was only about 4 per cent of its current age. Its properties are similar to those of GRBs observed at low/intermediate redshifts, suggesting that the mechanisms and progenitors that gave rise to this burst about 600,000,000 years after the Big Bang are not markedly different from those producing GRBs about 10,000,000,000 years later.

Published
2009
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13. A new gamma-ray burst classification scheme from GRB 060614.

Author

Gehrels N, Norris JP, Barthelmy SD, Granot J, Kaneko Y, Kouveliotou C, Markwardt CB, Mészáros P, Nakar E, Nousek JA, O'Brien PT, Page M, Palmer DM, Parsons AM, Roming PW, Sakamoto T, Sarazin CL, Schady P, Stamatikos M, and Woosley SE

Abstract

Gamma-ray bursts (GRBs) are known to come in two duration classes, separated at approximately 2 s. Long-duration bursts originate from star-forming regions in galaxies, have accompanying supernovae when these are near enough to observe and are probably caused by massive-star collapsars. Recent observations show that short-duration bursts originate in regions within their host galaxies that have lower star-formation rates, consistent with binary neutron star or neutron star-black hole mergers. Moreover, although their hosts are predominantly nearby galaxies, no supernovae have been so far associated with short-duration GRBs. Here we report that the bright, nearby GRB 060614 does not fit into either class. Its approximately 102-s duration groups it with long-duration GRBs, while its temporal lag and peak luminosity fall entirely within the short-duration GRB subclass. Moreover, very deep optical observations exclude an accompanying supernova, similar to short-duration GRBs. This combination of a long-duration event without an accompanying supernova poses a challenge to both the collapsar and the merging-neutron-star interpretations and opens the door to a new GRB classification scheme that straddles both long- and short-duration bursts.

Published
2006
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14. An origin for short gamma-ray bursts unassociated with current star formation.

Author

Barthelmy SD, Chincarini G, Burrows DN, Gehrels N, Covino S, Moretti A, Romano P, O'Brien PT, Sarazin CL, Kouveliotou C, Goad M, Vaughan S, Tagliaferri G, Zhang B, Antonelli LA, Campana S, Cummings JR, D'Avanzo P, Davies MB, Giommi P, Grupe D, Kaneko Y, Kennea JA, King A, Kobayashi S, Melandri A, Meszaros P, Nousek JA, Patel S, Sakamoto T, and Wijers RA

Abstract

Two short (< 2 s) gamma-ray bursts (GRBs) have recently been localized and fading afterglow counterparts detected. The combination of these two results left unclear the nature of the host galaxies of the bursts, because one was a star-forming dwarf, while the other was probably an elliptical galaxy. Here we report the X-ray localization of a short burst (GRB 050724) with unusual gamma-ray and X-ray properties. The X-ray afterglow lies off the centre of an elliptical galaxy at a redshift of z = 0.258 (ref. 5), coincident with the position determined by ground-based optical and radio observations. The low level of star formation typical for elliptical galaxies makes it unlikely that the burst originated in a supernova explosion. A supernova origin was also ruled out for GRB 050709 (refs 3, 31), even though that burst took place in a galaxy with current star formation. The isotropic energy for the short bursts is 2-3 orders of magnitude lower than that for the long bursts. Our results therefore suggest that an alternative source of bursts--the coalescence of binary systems of neutron stars or a neutron star-black hole pair--are the progenitors of short bursts.

Published
2005
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15. A giant gamma-ray flare from the magnetar SGR 1806-20.

Author

Palmer DM, Barthelmy S, Gehrels N, Kippen RM, Cayton T, Kouveliotou C, Eichler D, Wijers RA, Woods PM, Granot J, Lyubarsky YE, Ramirez-Ruiz E, Barbier L, Chester M, Cummings J, Fenimore EE, Finger MH, Gaensler BM, Hullinger D, Krimm H, Markwardt CB, Nousek JA, Parsons A, Patel S, Sakamoto T, Sato G, Suzuki M, and Tueller J

Abstract

Two classes of rotating neutron stars-soft gamma-ray repeaters (SGRs) and anomalous X-ray pulsars-are magnetars, whose X-ray emission is powered by a very strong magnetic field (B approximately 10(15) G). SGRs occasionally become 'active', producing many short X-ray bursts. Extremely rarely, an SGR emits a giant flare with a total energy about a thousand times higher than in a typical burst. Here we report that SGR 1806-20 emitted a giant flare on 27 December 2004. The total (isotropic) flare energy is 2 x 10(46) erg, which is about a hundred times higher than the other two previously observed giant flares. The energy release probably occurred during a catastrophic reconfiguration of the neutron star's magnetic field. If the event had occurred at a larger distance, but within 40 megaparsecs, it would have resembled a short, hard gamma-ray burst, suggesting that flares from extragalactic SGRs may form a subclass of such bursts.

Published
2005
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