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THE ASTRONOMER Electronic Circular No 2269      2006 Oct 07 12.27UT
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 061007 AND BRIGHT OPTICAL COUNTERPART
Patricia Schady (MSSL-UCL) at MSSL/Swift reports on GCN Circular 5707 
the discovery of GRB 061007 as follows:

At 10:08:08 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 061007 (trigger=232683).  Swift slewed immediately to the 
burst. The BAT on-board calculated location is:
RA03h 05m 16s DEC -50 29' 15" (2000) with an uncertainty of 3 arcmin. 
The BAT light curve showed a multi-peaked structure with a duration of 
about 100 sec. The peak count rate was ~25000 counts/sec (15-350 keV), 
at ~54 sec after the trigger.

The XRT began observing the field at 10:09:29 UT, 80 seconds after the 
BAT trigger. XRT found a bright, fading, uncatalogued X-ray source 
located at RA 03h 05m 19.5s DEC-50 30' 02.1" (2000), with
an estimated uncertainty of 7.5 arcseconds (90% confidence radius). This 
location is 55 arcseconds from the BAT on-board position, within the BAT 
error circle.

UVOT took a finding chart exposure of 400 seconds with the V filter
starting 195 seconds after the BAT trigger. There is a very bright
source in the 2.7' x 2.7' sub-image not present in DSS at:
RA 03:05:19.51 DEC -50:30:02.5 (2000) with a 1-sigma
error radius of about 0.5 arc sec. This position is 0.7 arc sec. from 
the centre of the XRT error circle. The estimated magnitude is 12.8 with 
a 1-sigma error of about 0.5 mag. No correction has been made for the 
expected extinction of about 0.1 magnitudes.

Editor: The object is in the deep south but we urge any of our overseas 
subscribers in the southern hemisphere to try and image the counterpart 
and report back to us.

Guy M Hurst