GCN Circular 14071
Subject
GRB 121212A: optical observations in ISON-NM observatory
Date
2012-12-12T18:12:28Z (11 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
L. Elenin (KIAM), A. Pozanenko (IKI), A. Volnova (SAI MSU, IKI), V.
Savanevych (KNURE), A. Bryukhovetskiy (NSFCTC), I. Molotov (KIAM), report on
behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 121212A (Grupe et al., GCN 14064)
with 0.45-m telescope of ISON-NM observatory starting on Dec. 12 (UT)
06:58:31, i.e 138 s after burst trigger. We took several unfiltered
images of 30 s exposures. An automatic real-time pipeline did not detect
any new object. However after stacking all images we marginally detected the
source not visible in any filter of DSS2 in coordinates 11 51 10.40 +78 02
15.3 with uncertainty of 0.3 arcsec in both coordinates. The source is
consistent with enhanced XRT afterglow position (Beardmore et al. GCN
14066) and optical transient (Kuin et al. GCN 14069; Perley and Horesh
GCN 14070) . A preliminary photometry of co-added frames is based on
the USNO-B1.0 (R2) nearby stars is following:
UT start, Exposure, OT, UL (3 sigma)
06:58:31 30 n/d 18.3
06:58:31 3x30 n/d 18.7
06:58:31 10x30 n/d 19.4
06:58:31 40x30 20.7 +/- 0.4 20.5