[vsnet-grb-info 5479] GRB071020: optical observations
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Wed Dec 12 07:46:28 JST 2007
TITLE: GCN CIRCULAR
NUMBER: 7146
SUBJECT: GRB071020: optical observations
DATE: 07/12/11 22:46:19 GMT
FROM: Alexei Pozanenko at IKI, Moscow <apozanen at iki.rssi.ru>
S. Sergeev, V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of
larger GRB follow-up collaboration:
We observed the optical afterglow (Schaefer et al. GCN 6948) of GRB071020
(Tueller et al. GCN 6954) in I and B bands on Oct.10-11 between (UT)
23:51:34 - 01:11:47 with AZT-8 telescope of CrAO. We detected the afterglow
in I-band, and not detected it in B-band. Based on SDSS stars (Cool et al.
GCN 6950) RA=119.66618, Dec=32.84706; RA=119.68899, Dec=32.84803;
RA=119.66782, Dec=32.85465 we estimated brightness of the optical
afterglow on a stacked images:
T0+, Exposure, Filter, mag., UL
(mid time)
0.730 d 12x90 s I 20.5 +/-0.3 20.5
0.728 d 12x180 s B n/d 21.0
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