The decay of optical emission from the Gamma-Ray Burst GRB 970228

Details The decay of optical emission from the Gamma-Ray Burst GRB 970228 The decay of optical emission from the Gamma-Ray Burst GRB 970228

1997-12-24

arxiv.org/abs/astro-ph/9712322v1

Astronomy and Astrophysics

Astrophysics

5 pages, latex, to appear in Gamma-Ray Bursts, 4-th Huntsville Symposium, eds Meegan, Preece, Koshut

Scientific paper

We present the R_c band light curve of the optical transient (OT) associated with GRB970228, based on re-evaluation of existing photometry. Data obtained until April 1997 suggested a slowing down of the decay of the optical brightness. However, the HST observations in September 1997 show that the light curve of the point source is well represented by a single power law, with a ``dip'', about a week after the burst occured. The exponent of the power law decay is $\alpha$ = --1.10 $\pm$ 0.04. As the point source weakened it also became redder.

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