{
  "bibcode": "2002GCN..1411....1D",
  "body": "GRB020531: Upper Limit for Detection of Two TAROT Sources\n\nA. Dullighan, G. Monnelly, N. Butler, R. Vanderspek, P. Ford, and G. \nRicker (MIT)\n\nwrite:\n\nWe obtained early epoch observations of the HETE error region of the \nshort gamma-ray burst GRB020531 (H2042; Ricker et al., GCN #1399) \nwith the Baade 6.5m telescope at the Magellan Observatory on 2002 \nJune 1.17 UT using the LDSS-2 instrument. The observations took place \n1.19 days after the burst. A mosaic of seven 300s R-band exposures \ncovered the entire IPN error region (Hurley et al., GCN #1402).\n\nWe detect neither source A nor source B that were reported by Boer et \nal. (GCN #1408) from TAROT observations taken 1.5 hours after the \nburst. For each of these two source locations, our 3 sigma upper \nlimit is R=23.3. If source B were the afterglow of GRB020531, our \nresult implies that the decay power law index was steeper than 1.93 \nbetween the epoch of the earlier TAROT observations and that of our \nlater Magellan observations.\n\nThis message may be cited.",
  "circularId": 1411,
  "createdOn": 1023310055000,
  "email": "grr@space.mit.edu",
  "subject": "GRB020531: Upper Limit for Detection of Two TAROT Sources",
  "submitter": "George Ricker at MIT  <grr@space.mit.edu>",
  "eventId": "GRB 020531"
}