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GCN Circular 6280

GRB 070412: Gemini/GMOS afterglow candidate
2007-04-12T07:23:34Z (17 years ago)
Edo Berger at Carnegie Obs <>
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."
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