GCN Circular 6280
Subject
GRB 070412: Gemini/GMOS afterglow candidate
Event
Date
2007-04-12T07:23:34Z (20 years ago)
From
Edo Berger at Carnegie Obs <eberger@ociw.edu>
E. Begrer (Carnegie) reports on behalf of a larger collaboration:
"We observed the XRT error circle of GRB 070412 (GCN 6273) with GMOS on
the Gemini-north telescope for a total of 360 sec in i-band starting on
2007 Apr 12.229 UT (4 hr after the burst). Within the XRT error circle we
find a single faint object with i=23.9+/-0.2 mag (using the zeropoint on
the GMOS website) located at:
RA = 12:06:10.585
DEC = +40:08:24.83 (J2000)
with an uncertainty of about 0.2". This position is 3.2" away from the
center of the XRT error circle (GCN 6273) and 2.1" away from the I-band
source discussed in GCN 6279. The non-detection of an object at this
position in the R-band to a limit of 24 mag at t=1 hr (GCN 6276) indicates
that this object (if it is the afterglow) is red, with R-I ~ 1.6 mag for a
fading rate of t^-1."