[vsnet-grb-info 2274] GRB 050502b: Optical limit

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4113
SUBJECT: GRB 050502b: Optical limit
DATE:    05/10/19 04:41:38 GMT
FROM:    Ken ichi Torii at RIKEN  <torii at ess.sci.osaka-u.ac.jp>

K. Torii (Osaka U.) reports on behalf of the ART collaboration:

 The error region of the bright GRB 050502b (Falcone et al. GCN 3330)
was observed by the 14 inch Automated Response Telescope.  Ic band
imaging was started at 2005 May 2 10:19:30 UT (54 minutes after the
burst) and 60s exposure was repeated. 

 The optical afterglow (Rich et al. GCN 3338) is not detected in our
frames and the following 3-sigma upper limit is derived for a stacked
image.

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StartUT-EndUT Filter	Limit	Exposure
------------------------------------------
10:55:59-13:00:20 Ic	>18.6	87x60s
------------------------------------------