light curves of GRB 970508 optical remnant and magnitudes of underlying host galaxy

Free access article

Issue		Astron. Astrophys. Suppl. Ser. Volume 138, Number 3, September 1999 Gamma-Ray Bursts in the Afterglow Era Contents Rome, November 3-6, 1998


Page(s)		485 - 486
DOI		http://dx.doi.org/10.1051/aas:1999321

DOI: 10.1051/aas:1999321

Astron. Astrophys. Suppl. Ser. 138, 485-486

$BVR_{\rm c}I_{\rm c}$ light curves of GRB 970508 optical remnant and magnitudes of underlying host galaxy

S.V. Zharikov and V.V. Sokolov

Send offprint request: S.V. Zharikov, e-mail: zhar@sao.ru

Special Astrophysical Observatory of R.A.S, Karachai-Cherkessia, Nizhnij Arkhyz, 357147, Russia
e-mail: zhar,sokolov@sao.ru

Received December 29, 1998; accepted March 23, 1999

Abstract:

The observations with the SAO-RAS 6-m telescope in July-August 1998 show that the GRB 970508 optical remnant has varied very little since November 1997. We can conclude that we observe a proper host galaxy without a GRB optical remnant. The fitting results of the light curve of the GRB remnant plus the host galaxy until about 400 days after the primary event are reported here. The best $\chi^2$ -fits with a power law, for most of the filters used, are not acceptable. Some intrinsic variability of the GRB optical remnant fading is possible, which demands a more complex law presenting the largest multiband homogeneous data set from a single telescope.

Key words: gamma-rays: bursts -- galaxies: photometry

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