[vsnet-grb-info 11671] GRB 120312A: Gemini and UKIRT imaging

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  13064
SUBJECT: GRB 120312A: Gemini and UKIRT imaging
DATE:    12/03/13 22:57:53 GMT
FROM:    Nial Tanvir at U.Leicester  <nrt3 at star.le.ac.uk>

N. R. Tanvir (U. Leicester), D. Perley (Caltech), K. Wiersema (U. Leicester),
A. Cucchiara (UCSC/UCO Lick), K. Roth (Gemini) and J. Ehle (JACH)
report on behalf of a larger collaboration:

We observed the location of GRB 120312A with Gemini-N/GMOS
in the z-band and UKIRT/WFCAM in the J- and K-bands.  All observations
were obtained approximately 23 hours post-burst.

With GMOS we detect the source reported by Tanvir et al. (GCN 13055).
Calibrating against SDSS field stars we find a magnitude z=24.35 +- 0.12,
indicating a fading compared to the WHT epoch, and confirming this
source as the afterglow of the GRB.