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GCN Circular 4024

GRB 050922B: optical limit
2005-09-23T06:51:16Z (19 years ago)
Ken ichi Torii at RIKEN <>
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	
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