GCN Circular 6604
Subject
GRB 070429B: NIR Observations
Event
Date
2007-07-06T23:23:50Z (18 years ago)
From
Melissa Nysewander at STScI <mnysewan@stsci.edu>
M. Nysewander, A. Fruchter and J. Graham (STScI) report on behalf of a
larger collaboration:
We observed the entire BAT error circle of the short GRB 070429B
(Markwardt et al. GCN 6358) with ISPI on the Blanco 4-m at CTIO at a
mean time of 06:10:28 UT on April 30, 2007 (1.13 days post burst) in 18
x 60-s J-band exposures, and again at a mean time of 06:23:04 UT on June
2, 2007, (34.2 days post burst) with the same exposure sequence.
Due to the questionable nature of the faint XRT afterglow candidate
(Beardmore et al. GCN 6360), we searched the entire BAT error circle by
subtracting the two epochs using ISIS2 (Alard, 2000). We do not find any
variation between the two epochs to the limiting magnitude of the first
epoch, J ~ 21.5. Specifically, the source within the XRT error circle
noted by Cucchiara et al. (GCN 6368) also did not vary between the two
epochs.