GCN Circular 3475
Subject
Swift/UVOT UV and optical detections of GRB 050525
Date
2005-05-25T12:29:37Z (19 years ago)
From
Alexander Blustin at MSSL-UCL <ajb@mssl.ucl.ac.uk>
S. Holland (GSFC), D. Band (GSFC/UMBC), A. Blustin,
S. Rosen (MSSL), P. Roming (PSU), P. Schady (MSSL/PSU),
K. Mason (MSSL), C. Gronwall (PSU), A. Breeveld (MSSL),
T. Poole, C. James, K. McGowan, M. de Pasquale (MSSL)
S. Hunsberger, C. Pagani, P. Brown, M. Ivanushkina (PSU),
B. Hancock, T. Kennedy (MSSL), P. Broos, S. Koch (PSU),
P. Smith, H. Huckle (MSSL), M. Still, P. Boyd,
W. Landsman (GSFC), J. Nousek (PSU), N. Gehrels (GSFC)
on behalf of the Swift UVOT team.
Swift/UVOT has detected GRB 050525 in all of its UV and
optical filters. Using data from 65 seconds after the
burst, we obtain the following magnitudes from images
summed between the T_start and T_stop times in the table:
Filter Magnitude Exp (s) T_start T_stop
V 14.97 +/- 0.02 287 65 1292
B 16.53 +/- 0.03 188 224 1084
U 15.32 +/- 0.03 98 90 979
UVW1 15.63 +/- 0.04 98 196 2046
UVM2 15.75 +/- 0.06 98 182 952
UVW2 16.62 +/- 0.05 188 952 1189
Where T_start and T_stop are in seconds after the
trigger (Band et al. GCN 3466).
The magnitudes are based on preliminary zero-points,
measured in orbit, and will require refinement with
further calibration.