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THE ASTRONOMER Electronic Circular No 2737      2011 May 03 18.40UT
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 110503A: BRIGHT OPTICAL COUNTERPART
Scott Barthelmy reports on GCN Circular 11991 on behalf of the SWIFT 
team that at 17:35:45 UT today, the Swift Burst Alert Telescope (BAT) 
triggered and located GRB 110503A. The BAT on-board calculated location 
is:
RA 08h 51m 12s DEC +52d 12' 56" (2000).
The BAT light curve shows a single structure with a duration of about 10 
sec.

UVOT took a finding chart exposure of nominal 150.000 seconds with the 
White filter starting 212 seconds after the BAT trigger. There is a 
candidate afterglow in the list of sources generated on-board at: RA 
08:51:06.24 DEC +52:12:27.5 with a 90%-confidence error radius of about 
1.10 arc sec. The estimated magnitude is
15.75.

Although the decline of these OTs can be very steep it would be 
worthwhile trying imaging and photometry this evening if the opportunity 
arises.

V1363 CYGNI
Further to TA E-Circular 2736, Nick James reports that he managed to do 
a V-band time series on V1363 Cyg on May 3 consisting
of 88 x 3 min frames running from 22:50:50 to 03:35:39. The star appears 
slightly brighter than the previous night.
Measures from a couple of frames give:

2011-05-03T01:29:18     14.17V (4 AAVSO ref stars SD 0.023V)
2011-05-03T02:37:21     14.18V (4 AAVSO ref stars SD 0.022V)

Denis Buczynski also reports:
2011.05.01.04686 (01:07:29 UT) Position from Astrometrica
RA 20:06:11.53 Dec+33:42:37.5 V=14.4 (unfiltered) 183stars UCAC-3 
2011.05.01.04876 (01:10:13 UT) Position from Astrometrica
RA 20:06:11.54 Dec +33:42:37.5 V=14.4(unfiltered) 167stars UCAC-3

Guy M Hurst