[vsnet-grb-info 5095] GRB070917: optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6801
SUBJECT: GRB070917: optical observations
DATE:    07/09/19 18:25:37 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 error box of  GRB070917  (Cummings  et al., GCN 6743) with 
AZT-11 telescope of CrAO on Sep. 17.  Series of images were obtained between 
(UT) 2007-09-17 18:58:08 and 19:25:37 in R filter. In a combined image of 
6x300 s within the XRT error circle (Evans et al., GCN 6796) we do not 
detect any new sources in comparison with DSS2 up to the limiting magnitude 
(3 sigma) R=21.1. Photometry calibration is performed against USNO-A2.0. The 
combined image can be found in 
http://grb.rssi.ru/GRB070917/GRB070917_AZT-11.gif.

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