[vsnet-grb-info 1786] GRB 050716: Optical Observations

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3626
SUBJECT: GRB 050716: Optical Observations
DATE:    05/07/16 14:56:39 GMT
FROM:    Ken ichi Torii at RIKEN  <torii at crab.riken.go.jp>

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

 The error region of GRB 050716 (Rol et al. GCN 3623) was observed by
the Automated Response Telescope. The observation started at 2005 July
16 12:38:26 UT (142 s after the trigger) and BVRcIc frames of 60s
integration were acquired.

 We do not detect an optical counterpart of the X-ray afterglow (GCN
3623, 3624) and derive its 3-sigma upper limit relative to
USNO-B1.0 magnitude as follows.

================================
Start(UT) Filter Mag   Exposure
--------------------------------
12:55:06  Ic     >16.5 60s x27
--------------------------------