A Caltech Library Service

The optical counterpart to the γ-ray burst GRB970508

Djorgovski, S. G. and Metzger, M. R. and Kulkarni, S. R. and Odewahn, S. C. and Gal, R. R. and Pahre, M. A. and Frail, D. A. and Feroci, M. and Costa, E. and Palazzi, E. (1997) The optical counterpart to the γ-ray burst GRB970508. Nature, 387 (6636). pp. 876-878. ISSN 0028-0836. doi:10.1038/43126.

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item:


Understanding the nature of the gamma-ray burst phenomenon is one of the outstanding problems of modern astrophysics. The identification of counterparts at optical wavelengths is considered a crucial factor for determining the origin of these events. Here we report the detection and temporal properties of a variable optical source, which has been identified as the counterpart of the X-ray transient associated with the γ-ray burst GRB970508 (ref. 3). The initial optical images were obtained only 5.8 hours after the initial gamma-ray burst, after which the optical source was observed to brighten over the next two days before declining in luminosity with a t-1 power law. The decline in brightness follows a form predicted by many relativistic fireball models for γ-ray bursts, although the initial rise does not appear to be compatible with the simplest of these models. The observed fluence of the source at visible wavelengths over the period spanned by our observations is ≥4.6 times 10^(-8) erg cm^(-2), about 3% of the fluence of the gamma-ray burst itself.

Item Type:Article
Related URLs:
URLURL TypeDescription ReadCube access
Djorgovski, S. G.0000-0002-0603-3087
Kulkarni, S. R.0000-0001-5390-8563
Additional Information:© 1997 Macmillan Publishers Limited. Received 21 May; accepted 28 May 1997. We thank the staff of Palomar Observatory for their assistance during our observing runs, and the entire BeppoSAX team for their efforts in providing accurate burst positions as rapidly as possible. This work was supported in part by the NSF, NASA, the Bressler Foundation, the Norris Foundation and Caltech.
Funding AgencyGrant Number
Bressler FoundationUNSPECIFIED
Kenneth T. and Eileen L. Norris FoundationUNSPECIFIED
Issue or Number:6636
Record Number:CaltechAUTHORS:20150609-120007821
Persistent URL:
Official Citation:Djorgovski, S. G., Metzger, M. R., Kulkarni, S. R., Odewahn, S. C., Gal, R. R., Pahre, M. A., . . . Palazzi, E. (1997). The optical counterpart to the [gamma]-ray burst GRB970508. Nature, 387(6636), 876-878.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58122
Deposited On:10 Jun 2015 15:35
Last Modified:10 Nov 2021 21:59

Repository Staff Only: item control page