GCN Circular 13279
Subject
GRB 120422A: P200 NIR detection
Date
2012-05-03T03:21:57Z (12 years ago)
From
Daniel Perley at Caltech <dperley@astro.caltech.edu>
D. A. Perley, T. Jones, and R. Ellis (Caltech) report:
We observed the field of GRB 120422A (Troja et al., GCN 13243) with the
Wide-field IR Camera (WIRC) on the Palomar 200-inch telescope between
04:01 and 05:04 UT on 2012-05-02. 15 exposures of 240s each (1 hour of
observations total) were acquired in the J-band filter.
The optical counterpart to GRB 120422A (at this stage probably a rising
supernova; GCNs 13275, 13276, 13277) is clearly detected in the combined
image. Seeing conditions were good and the transient is resolved from
its host galaxy, although the background is affected by scattered light
from the bright star 1 arcmin to the northwest. Using a 0.8 arcsec
radius aperture, we measure a magnitude of J = 20.7 +/- 0.2 at a mean
time of 9.89 days after the burst.