[vsnet-grb-info 5354] GRB071010b: optical observation
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Sat Nov 3 23:35:50 JST 2007
TITLE: GCN CIRCULAR
NUMBER: 7041
SUBJECT: GRB071010b: optical observation
DATE: 07/11/03 14:35:44 GMT
FROM: Alexei Pozanenko at IKI, Moscow <apozanen at iki.rssi.ru>
K. Antonyuk, V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of
larger GRB follow-up collaboration:
We observed the optical afterglow (Oksanen GCN 6873, Kann et al. GCN 6884)
of GRB071010b (Markwardt et al., GCN 6871) in R-band on Oct.12 between
(UT) 01:01:50 - 02:03:27 with AZT-11 telescope of CrAO. Based on USNO-B1.0
star RA (J2000) = 10:02:09.93, Dec. (J2000) = +45:41:18.4, R2=16.80 we
estimated brightness of the optical afterglow on a stacked image:
T0+, Exposure, R_mag, err
(mid time)
1.1989 d 12x300 s 20.70 +/-0.08
In comparison with the afterglow brightness obtained 2 and 3 days after
burst (Klunko et al. GCN 6945), where photometry used the same calibration
star, one can suggest either re-brightening between 1st and 3rd days, or at
least plateau on the light curve.
The message may be cited.
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