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THE ASTRONOMER Electronic Circular No 3106      2015 Sep 11 19.36UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY@TAHQ.DEMON.CO.UK      Backup: gmh@wdcc1.bnsc.rl.ac.uk
WORLD WIDE WEB                         http://www.theastronomer.org
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GRB 150910A WITH OPTICAL COUNTERPART
Peter Birtwhistle, Great Shefford, Newbury, England responded to the alert
on TA E-Circular 3105 of an optical counterpart to GRB 150910A. He reports
as below.

Measures and errors from Astrometrica log, using UCAC4 star catalogue:

Mid-time of exposure 2015 09 10.909300 UT 
RA 00 22 40.090 ±0.44arcsec, Dec +33 28 21.93 ±0.44
mag (R) +20.39 ±0.17, S/Nr 4.0

Total exposure 19 min 44 seconds (a stack of 74 x 16 second exposures) with
0.4-m Schmidt-Cass + CCD.

Editor: An image from Peter was added to The Astronomer 2015 September
covers (in press).

Weikang Zheng zwk@astro.berkeley.edu, on behalf of KAIT GFRB team kindly
supplied us with an image of their detection of the OT which enabled us to
confirm identification of the object.

Martin Mobberley also obtained an image of the field at 2015 Sep 10,
13h53mUT using a robotic telescope but the object was below the limit.

Guy M Hurst