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GCN Circular 4235

Subject

GRB 051109A: Swift-UVOT Observations

Date

2005-11-09T19:55:43Z (18 years ago)

From

Stephen Holland at USRA/NASA/GSFC/SSC <sholland@milkyway.gsfc.nasa.gov>

GRB 051109A: Swift-UVOT Observations

S. T. Holland (GSFC/USRA), S. Campana (INAF-OAB), P. Smith (UCL/MSSL),
H. Huckle (UCL/MSSL), & N. Gehrels (GSFC) on behalf of
the Swift-UVOT team report:

      The Swift-UVOT began observing the field of GRB 051109A (BAT
Trigger 163136; Palmer, et al. GCN Circular 4213Not found
 
 
) at
2005-11-09T01:14:09, 109 seconds after the burst.

      We detect an optical transient at

RA(J2000) =  22:01:15.32
Dec(J2000) = +40:49:23.7

with a positional uncertainty of +/-0.5 arcsec (90% confidence),
in agreement with the position of Rykoff, et al. (2005, GCN Circular
4211Not found
 
 
).  The transient has V = 16.49 +/- 0.07 (1-sigma, statistical)
in an 89 s exposure starting at 2005-11-09T01:14:23, 123 seconds after
the BAT trigger.  This value supercedes the approximate magnitude given
in Palmer, et al. (2005, GCN Circular 4213Not found
 
 
).  This magnitude has not  
been
corrected for Galactic extinction.

      Further observations and analysis are underway.