[vsnet-grb-info 16030] GRB 150120A: P60 optical observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Tue Jan 20 13:07:02 JST 2015
TITLE: GCN CIRCULAR
NUMBER: 17312
SUBJECT: GRB 150120A: P60 optical observations
DATE: 15/01/20 04:06:55 GMT
FROM: Daniel Perley at Caltech <dperley at astro.caltech.edu>
D. A. Perley (Caltech) and S. B. Cenko (NASA/GSFC) report:
The Palomar 60-inch robotic telescope began automatic follow-up of the
location of possibly-short GRB 150120A (D'Elia et al. GCN 17310)
starting at 2015-01-30 03:00:33 UT, approximately 2.7 minutes after the
GRB trigger. A sequence of rotating r, i, and z 60-second exposures was
acquired, followed by five 180-second exposures in each of r and i
bands, under good conditions.
No sources are clearly detected inside the enhanced XRT error circle
(Evans et al., GCN 17311), either in either individual exposures or in
stacks of all 60-second exposures taken in each filter (approximate UT
center time 15 minutes post-trigger, limiting magnitudes r>22.5, i>22.4,
z>20.9). We detect two faint sources slightly outside the error circle
in the stacked frames:
Source A: RA=00:41:16.55, dec=+33:59:42.87
Source B: RA=00:41:16.76, dec=+33:59:42.11
Both sources appear to be marginally detected in SDSS pre-imaging and we
do not yet have evidence of fading behavior. Further observations and
analysis are ongoing.
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