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Titolo:
BVRCIC PHOTOMETRY OF GRB-970508 OPTICAL REMNANT - MAY-AUGUST, 1997
Autore:
SOKOLOV VV; KOPYLOV AI; ZHARIKOV SV; FEROCI M; NICASTRO L; PALAZZI E;
Indirizzi:
CNR,IST TECNOL & RADIAZ EXTRATERR,VIA P GOBETTI 101 I-40129 BOLOGNA ITALY CNR,IST TECNOL & RADIAZ EXTRATERR I-40129 BOLOGNA ITALY RAS,SPECIAL ASTROPHYS OBSERV NIZHNII ARKHYZ 357147 RUSSIA CNR,IST ASTROFIS SPAZIALE I-00131 ROME ITALY
Titolo Testata:
Astronomy and astrophysics
fascicolo: 1, volume: 334, anno: 1998,
pagine: 117 - 123
SICI:
0004-6361(1998)334:1<117:BPOGOR>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Keywords:
GAMMA-RAYS, BURSTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
V.V. Sokolov et al., "BVRCIC PHOTOMETRY OF GRB-970508 OPTICAL REMNANT - MAY-AUGUST, 1997", Astronomy and astrophysics, 334(1), 1998, pp. 117-123

Abstract

We present the results of photometric observations of the variable optical source associated to the remnant of the gamma-ray burst GRB 970508 performed at the Special Astrophysical Observatory of the Russian Academy of Science (SAO RAS) from May to August 1997. The observations were carried out with the standard (Johnson-Kron-Cousins) photometric BVRcTc system using the 1-meter and 6-meter telescopes. The brightnessof the optical source increased from R-c = 21.19 +/- 0.25 (May 9.75 UT) to R-c = 19.10 +/- 0.03 (May 10.77 UT), whereupon it was decaying in all the four BVRcIc bands during about one month after the burst. Between the 3rd and the 6th night after the GRB 970508 event, the flux decrease of the optical source follows an exponential law in all the four bands. In that period the broad-band spectrum of the object does not change and can be approximately described by the power law F-nu proportional to nu(-1.1). The subsequent observations in BVRcTc bands haveshown a reduction of the source brightness decrease rate. The source flux decay after the maximum in the R-c band is well described by a single power-law F proportional to t(-1.171(+/-0.012)) for the whole setof observations during 86 days. In the other bands the decay seems toslow down from the 31th day onwards. In particular, in the I-c band the source magnitude is about 23.1 from the 36th day after the GRB to the end of the observations (August 4, 1997).

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Documento generato il 26/09/17 alle ore 09:14:47