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  • American Association for the Advancement of Science (AAAS)  (4)
  • 1
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    Photometry and spectroscopy of the GRB 970508 optical counterpart (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-02-27
    Description: An optical transient within the error box of the gamma ray burst GRB 970508 was imaged 4 hours after the event. It displayed a strong ultraviolet excess, and reached maximum brightness 2 days later. The optical spectra did not show any emission lines, and no variations on time scales of minutes were observed for 1 hour during the decline phase. According to the fireball and afterglow models, the intensity should rise monotonically before the observed optical maximum, but the data indicate that another physical mechanism may be responsible for the constant phase seen during the first hours after the burst.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Castro-Tirado -- Gorosabel -- Benitez -- Wolf -- Fockenbrock -- Martinez-Gonzalez -- Kristen -- Broeils -- Pedersen -- Greiner -- Costa -- Feroci -- Piro -- Frontera -- Nicastro -- Palazzi -- Bartolini -- Guarnieri -- Masetti -- Piccioni -- Mignoli -- Wold -- Lacy -- Birkle -- Broadhurst -- et -- New York, N.Y. -- Science. 1998 Feb 13;279(5353):1011-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉A. J. Castro-Tirado and J. Gorosabel, Laboratorio de Astrofisica Espacial y Fisica Fundamental, INTA, Madrid, Spain. N. Benitez and E. Martinez-Gonzalez, Instituto de Fisica de Cantabria, Santander, Spain. C. Wolf, R. Fockenbrock, K. Birkle, Ma.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9461429" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Discovery of a transient absorption edge in the X-ray spectrum of GRB 990705 (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-11-04
    Description: We report the discovery of a transient equivalent hydrogen column density with an absorption edge at approximately 3.8 kiloelectron volts in the spectrum of the prompt x-ray emission of gamma-ray burst (GRB) 990705. This feature can be satisfactorily modeled with a photoelectric absorption by a medium located at a redshift of approximately 0.86 and with an iron abundance of approximately 75 times the solar one. The transient behavior is attributed to the strong ionization produced in the circumburst medium by the GRB photons. The high iron abundance points to the existence of a burst environment enriched by a supernova along the line of sight. The supernova explosion is estimated to have occurred about 10 years before the burst. Our results agree with models in which GRBs originate from the collapse of very massive stars and are preceded by a supernova event.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Amati, L -- Frontera, F -- Vietri, M -- in 't Zand, J J -- Soffitta, P -- Costa, E -- Del Sordo, S -- Pian, E -- Piro, L -- Antonelli, L A -- Fiume, D D -- Feroci, M -- Gandolfi, G -- Guidorzi, C -- Heise, J -- Kuulkers, E -- Masetti, N -- Montanari, E -- Nicastro, L -- Orlandini, M -- Palazzi, E -- New York, N.Y. -- Science. 2000 Nov 3;290(5493):953-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Istituto di Tecnologie e Studio delle Radiazioni Extraterrestri, CNR, Via Gobetti 101, 40129 Bologna, Italy. amati@tesre.bo.cnr.it〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11062120" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    Decay of the GRB 990123 optical afterglow: implications for the fireball model (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-03-26
    Description: Broad-band (ultraviolet to near-infrared) observations of the intense gamma ray burst GRB 990123 started approximately 8.5 hours after the event and continued until 18 February 1999. When combined with other data, in particular from the Robotic Telescope and Transient Source Experiment (ROTSE) and the Hubble Space Telescope (HST), evidence emerges for a smoothly declining light curve, suggesting some color dependence that could be related to a cooling break passing the ultraviolet-optical band at about 1 day after the high-energy event. The steeper decline rate seen after 1.5 to 2 days may be evidence for a collimated jet pointing toward the observer.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Castro-Tirado -- Zapatero-Osorio -- Caon -- Cairos -- Hjorth -- Pedersen -- Andersen -- Gorosabel -- Bartolini -- Guarnieri -- Piccioni -- Frontera -- Masetti -- Palazzi -- Pian -- Greiner -- Hudec -- Sagar -- Pandey -- Mohan V -- Yadav -- Nilakshi -- Bjornsson -- Jakobsson -- Burud I -- et -- New York, N.Y. -- Science. 1999 Mar 26;283(5410):2069-73.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Instituto de Astrofisica de Andalucia, IAA-CSIC, Granada, Spain. Instituto de Astrofisica de Canarias, La Laguna, Tenerife, Spain. Astronomical Observatory, University of Copenhagen, Copenhagen, Denmark. Nordic Optical Telescope, La Palma, T.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10092226" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    The metamorphosis of supernova SN 2008D/XRF 080109: a link between supernovae and GRBs/hypernovae (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-07-26
    Description: The only supernovae (SNe) to show gamma-ray bursts (GRBs) or early x-ray emission thus far are overenergetic, broad-lined type Ic SNe (hypernovae, HNe). Recently, SN 2008D has shown several unusual features: (i) weak x-ray flash (XRF), (ii) an early, narrow optical peak, (iii) disappearance of the broad lines typical of SN Ic HNe, and (iv) development of helium lines as in SNe Ib. Detailed analysis shows that SN 2008D was not a normal supernova: Its explosion energy (E approximately 6x10(51) erg) and ejected mass [ approximately 7 times the mass of the Sun (M(middle dot in circle))] are intermediate between normal SNe Ibc and HNe. We conclude that SN 2008D was originally a approximately 30 M(middle dot in circle) star. When it collapsed, a black hole formed and a weak, mildly relativistic jet was produced, which caused the XRF. SN 2008D is probably among the weakest explosions that produce relativistic jets. Inner engine activity appears to be present whenever massive stars collapse to black holes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mazzali, Paolo A -- Valenti, Stefano -- Della Valle, Massimo -- Chincarini, Guido -- Sauer, Daniel N -- Benetti, Stefano -- Pian, Elena -- Piran, Tsvi -- D'Elia, Valerio -- Elias-Rosa, Nancy -- Margutti, Raffaella -- Pasotti, Francesco -- Antonelli, L Angelo -- Bufano, Filomena -- Campana, Sergio -- Cappellaro, Enrico -- Covino, Stefano -- D'Avanzo, Paolo -- Fiore, Fabrizio -- Fugazza, Dino -- Gilmozzi, Roberto -- Hunter, Deborah -- Maguire, Kate -- Maiorano, Elisabetta -- Marziani, Paola -- Masetti, Nicola -- Mirabel, Felix -- Navasardyan, Hripsime -- Nomoto, Ken'ichi -- Palazzi, Eliana -- Pastorello, Andrea -- Panagia, Nino -- Pellizza, L J -- Sari, Re'em -- Smartt, Stephen -- Tagliaferri, Gianpiero -- Tanaka, Masaomi -- Taubenberger, Stefan -- Tominaga, Nozomu -- Trundle, Carrie -- Turatto, Massimo -- New York, N.Y. -- Science. 2008 Aug 29;321(5893):1185-8. doi: 10.1126/science.1158088. Epub 2008 Jul 24.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Max-Planck Institut fur Astrophysik, Karl-Schwarzschild-Strasse 1, 85748 Garching, Germany. mazzali@mpa-garching.mpg.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18653846" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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