GCN Circular 7518
Subject
GRB 080325: Swift/UVOT Upper Limits
Date
2008-03-25T20:25:03Z (17 years ago)
From
Peter Brown at PSU <pbrown@astro.psu.edu>
P. J. Brown and L. Vetere (PSU) report on behalf
of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field
of GRB 080325 (trigger=307604) starting 163 s after
the BAT trigger (Vetere et al., GCN Circ. 7512).
We do not detect an optical/uv afterglow at the
enhanced XRT position (Osborne et al., GCN Circ. 7513),
or NIR candidate (Updike et al., GCN Circ. 7515) in
the initial finding chart observations or subsequent
summed images down to the following 3 sigma upper limits:
Filter T_start (s) T_stop Exposure MagLimit
white 163 262 98 >20.6
white 163 5905 392 >21.5
v 269 513 240 >19.3
v 269 6297 419 >19.6
b 5501 5700 197 >20.6
u 4131 22211 353 >20.9
uvw1 3925 21975 2371 >21.8
uvm2 3720 10211 891 >21.1
uvw2 5912 6111 197 >20.1
The above magnitudes are not corrected for the Galactic
extinction corresponding to a reddening of
E(B-V) = 0 .064 mag (Schlegel et al.,1998, ApJS, 500, 525).
The photometry is on the UVOT flight systemdescribed in
Poole et al. (2008, MNRAS, 383,627).