GCN Circular 5172
Subject
GRB060526: Further Swift-UVOT Observations
Event
Date
2006-05-27T04:28:15Z (20 years ago)
From
Peter Brown at PSU <pbrown@astro.psu.edu>
P. J. Brown (Penn State), S. Campana (INAF-OAB),
P. T. Boyd (NASA/GSFC), & F. E. Marshall (NASA/GSFC),
report on behalf of the Swift UVOT team:
The afterglow of GRB060526 (BAT Trigger 211957)
reported in Campana et al. (GCN 5162) is also
detected by UVOT in the B filter, as well as the
previously reported V and White filters,
and continues to fade. We report the following
additional UVOT detections:
Filter Tstart-Tstop(s) Exp(s) Mag Err
White 6335-6534 200 19.2 0.2
V 5311-5511 200 18.2 0.2
V 6744-6944 200 18.6 0.2
B 665-675 10 18.2 0.4
B 6130-6330 200 19.4 0.2
The afterglow is not detected in any filters
blueward of B, consistent with the z=3.21 redshift
measured by Berger & Gladders (GCN 5170).
The 3 sigma upper limits in summed images are:
Filter Tstart-Tstop(s) Exp(s) UpperLimit(3sigma)
U 641-1492 58 >19.1
W1 617-1468 58 >19.1
M2 593-1444 58 >19.0
W2 693-1554 78 >19.6
In addition, examination of the event mode data of
the first V band observation, spanning 188 to 588
seconds after the trigger, shows an optical flare
coincident with the flare seen by BAT and XRT
(Campana et al. GCN 5163).