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Titolo:
Evidence for a supernova in reanalyzed optical and near-infrared images ofGRB 970228
Autore:
Galama, TJ; Tanvir, N; Vreeswijk, PM; Wijers, RAMJ; Groot, PJ; Rol, E; van Paradijs, J; Kouveliotou, C; Fruchter, AS; Masetti, N; Pedersen, H; Margon, B; Deutsch, EW; Metzger, M; Armus, L; Klose, S; Stecklum, B;
Indirizzi:
Ctr High Energy Astrophys, NL-1098 SJ Amsterdam, Netherlands Ctr High Energy Astrophys Amsterdam Netherlands NL-1098 SJ , Netherlands Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1098 SJ Amsterdam, Netherlands Univ Amsterdam Amsterdam Netherlands NL-1098 SJ J Amsterdam, Netherlands Univ Hertfordshire, Dept Phys Sci, Hatfield AL10 9AB, Herts, England Univ Hertfordshire Hatfield Herts England AL10 9AB 10 9AB, Herts, England SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA SUNY StonyBrook Stony Brook NY USA 11794 tron, Stony Brook, NY 11794 USA Univ Alabama, Dept Phys, Huntsville, AL 35899 USA Univ Alabama HuntsvilleAL USA 35899 Dept Phys, Huntsville, AL 35899 USA Univ Space Res Assoc, Columbia, MD 21044 USA Univ Space Res Assoc Columbia MD USA 21044 Assoc, Columbia, MD 21044 USA NASA, MSFC, Huntsville, AL 35812 USA NASA Huntsville AL USA 35812NASA, MSFC, Huntsville, AL 35812 USA Space Telescope Sci Inst, Baltimore, MD 21218 USA Space Telescope Sci Inst Baltimore MD USA 21218 , Baltimore, MD 21218 USA CNR, I-40129 Bologna, Italy CNR Bologna Italy I-40129CNR, I-40129 Bologna, Italy Copenhagen Univ Observ, D-2100 Copenhagen A, Denmark Copenhagen Univ Observ Copenhagen Denmark A D-2100 Copenhagen A, Denmark Univ Washington, Dept Astron, Seattle, WA 98195 USA Univ Washington Seattle WA USA 98195 , Dept Astron, Seattle, WA 98195 USA CALTECH, SIRTF Sci Ctr, Pasadena, CA 91125 USA CALTECH Pasadena CA USA 91125 TECH, SIRTF Sci Ctr, Pasadena, CA 91125 USA Thuringer Landessternwarte Tautenburg, D-07778 Tautenburg, Germany Thuringer Landessternwarte Tautenburg Tautenburg Germany D-07778 Germany
Titolo Testata:
ASTROPHYSICAL JOURNAL
fascicolo: 1, volume: 536, anno: 2000,
parte:, 1
pagine: 185 - 194
SICI:
0004-637X(20000610)536:1<185:EFASIR>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
GAMMA-RAY-BURST; HUBBLE-SPACE-TELESCOPE; 28 FEBRUARY 1997; 25 APRIL 1998; X-RAY; LIGHT-CURVE; ERROR BOX; SN 1998BW; AFTERGLOW; GRB-970228;
Keywords:
gamma rays : bursts; supernovae : general;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
56
Recensione:
Indirizzi per estratti:
Indirizzo: Galama, TJ CALTECH, Palomar Observ, 105-24, Pasadena, CA 91125 USA CALTECH105-24 Pasadena CA USA 91125 24, Pasadena, CA 91125 USA
Citazione:
T.J. Galama et al., "Evidence for a supernova in reanalyzed optical and near-infrared images ofGRB 970228", ASTROPHYS J, 536(1), 2000, pp. 185-194

Abstract

We present B-, V-, R-C-, I-C-, J-, H-, K-, and K'-band observations of theoptical transient (OT) associated with GRB 970228, based on a reanalysis of previously used images and unpublished data. In order to minimize calibration differences, we have collected and analyzed most of the photometry andconsistently determined the magnitude of the OT relative to a set of secondary held stars. We confirm our earlier finding that the early decay of thelight curves (before 1997 March 6) was faster than that at intermediate times (between 1997 March 6 and April 7). At late times the light curves resume a fast decay (after 1997 April 7). The early-time observations of GRB 970228 are consistent with relativistic blast-wave models, but the intermediate- and late-time observations are hard to understand in this framework. The observations are well explained by an initial power-law decay with alpha = -1.51 +/- 0.06 modified at later times by a Type Ic supernova light curve. Together with the evidence for GRB 980326 and GRB 980425, this gives further support for the idea that at least some gamma-ray bursts are associatedwith a possibly rare type of supernova.

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Documento generato il 13/07/20 alle ore 07:58:30