[vsnet-grb-info 9528] GRB100727A: MOA optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  10999
SUBJECT: GRB100727A: MOA optical upper limit
DATE:    10/07/27 09:53:01 GMT
FROM:    Shuhei Kobara at U.Nagoya/MOA-II  <kobara at stelab.nagoya-u.ac.jp>

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

We searched for an optical afterglow of GRB100727A (GCN 10998, D. C. Morris et al.)
starting from 07:12:3 UT on 2010 July 27 ( 90 minutes after the burst) 
with the MOA-II 1.8m telescope at Mt.John observatory in New Zealand.
In a single image of a 300 sec exposure with a wideband 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 10998, D. C. Morris et al.
).
A 3 sigma upper limit is set in the I magnitude at 21.6 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.