[vsnet-grb-info 9405] GRB100625A : MOA optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  10885
SUBJECT: GRB100625A : MOA optical upper limit 
DATE:    10/06/25 21:19:35 GMT
FROM:    Suzuki Daisuke at MOA-II  <dsuke at stelab.nagoya-u.ac.jp>

D. Suzuki, F. Hayashi, S. Kobara, T. Sako, H.Naito, K. Omori (STE Lab, Nagoya Univ.)
on behalf of the MOA Collaboration  report:

We searched for an optical afterglow of GRB 100625A (GCN 10884, S. T. Holland et al.)
starting from 18:49 UT on 2010 June 25th (17 minutes after the BAT trigger)
with the MOA-II 1.8m telescope at Mt.John observatory in New Zealand.
In a single image of a 60sec exposure with a wide-band Red filter (center 
wavelength ~ 750nm and FWHM ~ 250nm), we did not find any object
within the error circle of the Swift XRT source position (GCN 10884).
A 3 sigma upper limit is set in the I magnitude at 22.77 mag.   

This photometry was done by using the DoPhot and calibrated against the 
USNO-B1.0 catalog stars, and not corrected for the Galactic extinction.