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GCN Circular 13064

Subject
GRB 120312A: Gemini and UKIRT imaging
Date
2012-03-13T22:57:53Z (12 years ago)
From
Nial Tanvir at U.Leicester <nrt3@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.

From a provisional reduction of the UKIRT data, the afterglow is undetected
to 3-sigma limits of J=21.1 and K=19.5 (calibrated against 2MASS), showing
that it is not extremely red, as might have been expected if its faintness
were due to a very dusty line of sight.
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