GCN Circular 13586
Subject
GRB 120804A: Gemini-North observations
Date
2012-08-05T05:57:28Z (12 years ago)
From
Ryan Chornock at Harvard <rchornock@cfa.harvard.edu>
R. Chornock and E. Berger (Harvard) report on behalf of a larger
collaboration:
We observed the position of the X-ray afterglow of the short GRB 120804A
(Lien et al., GCN 13573) using GMOS on the Gemini-North 8-m telescope.
Observations began at 05:47 UT on 2012 August 4 (approximately 4.9 hours
after the BAT trigger). We obtained 11x180s of observations in both the
r and i filters. We find a pair of faint sources in the i band
observations within the enhanced XRT position (Osborne et al., GCN
13577) with coordinates (J2000):
S1: 15:35:47.48, -28:46:56.2
S2: 15:35:47.53, -28:46:57.6
with astrometric errors of about 0.3" relative to 2MASS. S1 is slightly
brighter than S2 in i. Neither source is detected in r. Further
observations are planned in order to search for variability of these
sources.
We thank the Gemini staff, particularly Chad Trujillo, for their
assistance with these observations.