TITLE:   GCN CIRCULAR
NUMBER:  7518
SUBJECT: GRB 080325: Swift/UVOT Upper Limits
DATE:    08/03/25 20:25:03 GMT
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).