GCN Circular 14302
Subject
GRB130313A: Optical observations from GTC
Date
2013-03-14T06:55:45Z (12 years ago)
From
Antonio de Ugarte Postigo at IAA-CSIC <deugarte@iaa.es>
A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), C.C. Thoene (IAA-CSIC),
J. Gorosabel (IAA-CSIC), R. Sanchez-Ramirez (IAA-CSIC), J. P. U. Fynbo
(DARK/NBI) and N. Tanvir (U. Leicester) report:
We have observed the field of the short GRB 130313A (Gompertz et al.,
GCN 14293) using the 10.4m GTC. Observations started at 5:22 UT
(13.23 hr after the burst) and were performed in the r-band in good conditions
and a seeing of ~0.8". The combined 8x120s exposure covers the complete
refined BAT error box (Barthelmy et al., GCN 14296).
We detect a point-like source at the edge of the suggested X-ray afterglow
(Osborne et al., GCN 14300) for which we estimate a preliminary magnitude
of r=26.3+/-0.4, as compared with SDSS stars (we note that the photometry is
complicated by a nearby bright star). This object is located at the following
coordinates (J2000, +/-0.5"):
S1:
R.A.: 15:45:38.45
Dec.: -00:22:03.5
There are two other marginally detected sources consistent with the XRT error
box, one unresolved at:
S2:
R.A.: 15:45:38.21
Dec.: -00:22:10.3
And one extended:
S3:
R.A.: 15:45:38.64
Dec.: -00:22:04.7
A finding chart with these sources can be found at:
http://www.iaa.es/~deugarte/GRBs/130313A/130313A_GTC.jpg
Further observations in search for variability will be needed to determine the relation
of any of these sources with GRB 130313A.