GCN Circular 4107
Subject
GRB 051016B: Swift/UVOT detection
Date
2005-10-17T13:45:59Z (19 years ago)
From
Alexander Blustin at MSSL-UCL <ajb@mssl.ucl.ac.uk>
A. J. Blustin (UCL-MSSL), A. Parsons (GSFC), S. T. Holland (GSFC),
P. Meszaros, M. Chester (PSU), N. Gehrels (GSFC) on behalf of
the Swift/UVOT team report:
The Swift/UVOT began taking a settled exposure of the field of
GRB 051016B 78 s after the trigger (Parsons et al. GCN 4103).
A faint optical/UV source (not visible in the DSS) is detected
in summed images at the position reported by Chen et al. (GCN 4105)
at greater than 3 sigma in four of the UVOT filters; the
magnitudes and upper limits are as follows:
Filter T_range(sec) Exp(sec) Mag/3-sig upper limit
V 78-29720 2418 20.5 (upper limit)
B 445-28020 2748 22.0 +/- 0.5
U 391-35505 2507 20.9 +/- 0.3
UVW1 337-34740 2796 21.7 +/- 0.4
UVM2 283-33833 2798 21.0 (upper limit)
UVW2 554-28928 2748 22.8 +/- 0.6
The detection in UVW2 would imply that the redshift of the source
is less than ~1.3.
There was a further uncatalogued nearby UV-only source at
(J2000 08:48:27.7 +13:39:12.0), outside the XRT error circle,
with the following magnitudes:
Filter Mag
UVW1 21.9 +/- 0.4
UVM2 22.3 +/- 0.4
UVW2 22.0 +/- 0.3
Further data will be required to tell whether either source is
variable.
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