Multicolor photometry of the GRB970508 optical remnant

Details Multicolor photometry of the GRB970508 optical remnant Multicolor photometry of the GRB970508 optical remnant

1997-09-10

arxiv.org/abs/astro-ph/9709093v1

Astronomy and Astrophysics

Astrophysics

14 pages, Postscript figures, Latex, psfig.sty included, poster to Fourth Huntsville Symposium on Gamma-Ray Bursts

Scientific paper

10.1063/1.55376

We report results of follow-up multicolor photometry of the optical variable source that is a probable remnant of the gamma-ray burst GRB970508 discovered by the BeppoSAX satellite (IAUC 6649). Observations were carried out in Johnson-Kron-Cousins $ BVR_cI_c system with the 1-m and 6-m telescopes of SAO RAS. Between the 2nd and the 5th day after the burst a fading of the remnant is well fitted with an exponential law in all four bands. During this period the `broadband spectrum' of the object was unchanged and can be approximated by a power-law, F_{\nu}\propto\nu^{-1.1}. After the 5th day the decline of brightness is slowed down. In the R_c band until the 32nd day, the light curve can be described by a power-law relation, F_t \propto t^{-1.2}.

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