[vsnet-grb-info 17358] GRB 151212A iTelescope observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18725
SUBJECT: GRB 151212A iTelescope observation
DATE:    15/12/27 04:48:03 GMT
FROM:    Takanori Sakamoto at AGU  <tsakamoto at phys.aoyama.ac.jp>

Y. Kitaoka, T. Sakamoto, A. Yoshida (AGU) 

We observed the field of GRB 151212A detected by MAXI (Nakahira et al., GCN Circ. 18685) 
with the iTelescope.Net (http://www.itelescope.net) T18 (Plane Wave CDK) telescope located 
at the AstroCamp Observatory (Nerpio, Spain).  20 images of 60 sec exposures were taken 
in the Red filter starting from December 12 22:43:00 (UT) about 8.7 hours after the trigger 
and stopped on December 12 23:17:03 (UT).  We do not detect the optical afterglow both in the 
individual images and the stacked image at the X-ray afterglow position 
(Roegiers et al., GCN Circ. 18687).  The estimated five sigma upper limit of the combined 
image (total exposure of 1200 sec) is ~17.0 using the USNO-B1 catalog.