GCN Circular 1411
Subject
GRB020531: Upper Limit for Detection of Two TAROT Sources
Date
2002-06-05T20:47:35Z (22 years ago)
From
George Ricker at MIT <grr@space.mit.edu>
GRB020531: Upper Limit for Detection of Two TAROT Sources
A. Dullighan, G. Monnelly, N. Butler, R. Vanderspek, P. Ford, and G.
Ricker (MIT)
write:
We obtained early epoch observations of the HETE error region of the
short gamma-ray burst GRB020531 (H2042; Ricker et al., GCN #1399)
with the Baade 6.5m telescope at the Magellan Observatory on 2002
June 1.17 UT using the LDSS-2 instrument. The observations took place
1.19 days after the burst. A mosaic of seven 300s R-band exposures
covered the entire IPN error region (Hurley et al., GCN #1402).
We detect neither source A nor source B that were reported by Boer et
al. (GCN #1408) from TAROT observations taken 1.5 hours after the
burst. For each of these two source locations, our 3 sigma upper
limit is R=23.3. If source B were the afterglow of GRB020531, our
result implies that the decay power law index was steeper than 1.93
between the epoch of the earlier TAROT observations and that of our
later Magellan observations.
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