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GCN Circular 1500

Subject
GRB020813: V-band decay slope
Date
2002-08-16T19:37:57Z (22 years ago)
From
Daniele Malesani at Obs.Astro. di Brera <malesani@merate.mi.astro.it>
D. Malesani and S. Covino (INAF, Merate Obs., Milan), D. Fugazza and R.
Barrena (TNG), E. Pian and N. Masetti (IASF/CNR, Bologna), on behalf of
a larger collaboration, report:


We observed the optical counterpart of GRB 020813 on Aug 13.99, 15.04
and 16.03 UT, using the VLT and TNG telescopes and a standard Bessel V
filter. The source is clearly detected and it shows a fading by 1.04 +/-
0.05 magnitudes between the first and the second epoch, and by 0.62 +/-
0.10 magnitudes between the second and third epoch. The afterglow is
hence decaying with time according to a sharply defined power-law with a
slope of delta = -1.4 +/- 0.02.

The break in the decay suggested in GCN #1476 (Bloom, Fox & Hunt) and
#1491 (Li, Chornock & Filippenko) is therefore confirmed.

Complete analysis of the photometric data is underway.

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