Discovery of an optical afterglow from the cosmic GRB 920925C

Details Discovery of an optical afterglow from the cosmic GRB 920925C Discovery of an optical afterglow from the cosmic GRB 920925C

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008astl...34..298d&link_type=abstract

Astronomy Letters, Volume 34, Issue 5, pp.298-304

Astronomy and Astrophysics

Astronomy

1

Scientific paper

A systematic study of the archival images for the error boxes of cosmic gamma-ray bursts (GRBs) obtained at the Palomar (USA) and Siding Spring (Australia) Observatories during the DSS allsky survey has revealed an optical transient with a magnitude of 17.8 within the error circle of the bright event GRB 920925C on the plate taken 6 h after the burst. The position of the object falls within the IPN error box for the burst. Analysis of the event properties suggests that the detected transient is most likely the optical afterglow from GRB 920925C. This event occurred 4.5 yr before GRB 970228, which has been considered to be the first optically identified GRB up until now.

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