[vsnet-grb-info 2185] GRB 050922B: optical limit

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4024
SUBJECT: GRB 050922B: optical limit
DATE:    05/09/23 06:51:16 GMT
FROM:    Ken ichi Torii at RIKEN  <torii at crab.riken.go.jp>

K. Torii (Osaka U.) reports:

 The error region of Swift GRB 050922B (Norris et al. GCN 4008) was
observed by the 14 inch Automated Response Telescope. BVRcIc imaging
started at 2005 September 22, 15:07:42 UT (342 s after the trigger)
and 60 s integration was repeated.

 Due to low transparency and intermittent clouds, useful images were
obtained after 15:16:47 UT. Preliminary analysis gives the following
3-sigma upper limits for an optical counterpart of the Swift XRT
afterglow (GCN 4008).

------------------------------------------
StartUT	Filter	Limit	Exposure
------------------------------------------
15:17:55 Rc	15.5	60s	
17:02:44 Ic	17.1	40x60s	
------------------------------------------