[vsnet-grb-info 5252] GRB071010b: optical observations
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Sat Oct 20 04:41:43 JST 2007
TITLE: GCN CIRCULAR
NUMBER: 6945
SUBJECT: GRB071010b: optical observations
DATE: 07/10/19 19:41:37 GMT
FROM: Alexei Pozanenko at IKI, Moscow <apozanen at iki.rssi.ru>
E. Klunko, A. Marchenkov, M. Eselevich (ISTP), A. Shulga, A. Volnova (SAI
MSU), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration
report:
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 ((UT)
19:44:42 - 20:45:06) and Oct. 13 ((UT)19:17:13 - 20:14:49) with 1.5m
telescope of Sayan observatory. The optical afterglow is clearly visible in
stacked images of both epochs. Based on two USNO B1.0 stars (Kann et. al
GCN 6918) (RA (J2000) = 10:02:09.93, Dec. (J2000) = +45:41:18.4, R2=16.80;
RA (J2000) = 10:02:23.11, Dec. (J2000) = +45:41:41.1, R2=16.94) we
estimated brightness of the optical afterglow:
T0+ , Exposure, R_mag
(mid time)
1.9995 d 15x240 s 20.5 +/-0.1
2.979 d 20x180 s 20.8 +/-0.2
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