Early detection of the Optical Transient following the Gamma-Ray Burst GRB 970228

Details Early detection of the Optical Transient following the Gamma-Ray Burst GRB 970228 Early detection of the Optical Transient following the Gamma-Ray Burst GRB 970228

1997-07-15

arxiv.org/abs/astro-ph/9707164v1

Astron.Astrophys. 328 (1997) L13-L16

Astronomy and Astrophysics

Astrophysics

4 pages, no figures, LaTeX A&A style file L-AA version 3, accepted by Astronomy and Astrophysics Letters, also available at

Scientific paper

The optical counterpart of the Gamma-Ray Burst GRB 970228, discovered by Groot et al. (IAU Circ. 6584), is also detected in the B and R frames obtained about 4 hours earlier at the Bologna Observatory. Our observations indicate a very likely rise of the optical emission within these 4 hours. The R luminosity of the transient at maximum was about 15 times that of an underlying extended object. Follow-up data show that the maximum optical emission was delayed of not less than 0.7 days with respect to the gamma-ray peak and that no new big flares were seen after the main one. The optical transient became significantly redder once it has reverted to quiescence.

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