[vsnet-grb-info 5768] Swift/UVOT observations of GRB 080315

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  7421
SUBJECT: Swift/UVOT observations of GRB 080315
DATE:    08/03/15 21:36:41 GMT
FROM:    Patricia Schady at MSSL/Swift  <ps at mssl.ucl.ac.uk>

P. Schady (MSSL/UCL) and K. L. Page (U Leicester) report on behalf of the 
Swift UVOT team:

The Swift/UVOT observed the field of GRB 080315 starting 125 s after the 
BAT trigger (Page et al., GCN 7416). We do not find any source in any of 
the individual or co-added exposures, either within the BAT error circle 
or at the location of the weak source detected by XRT (Barthelmy et al. 
GCN 7420).

The 5-sigma upper limits for detecting a source at the position of the XRT 
candidate in the co-added images are:

Filter  T_start T_stop Exp      Mag
         (s)     (s)    (s)      (5-sigma upper limit)
-----------------------------------------------------
v       127     42160   6078.4  > 20.79
b       608     40422   5815.6  > 21.84
u       582     7467    620.7   > 20.30
uvw1    558     7281    468.7   > 19.82
uvm2    533     7075    858.7   > 20.00
uvw2    113     41328   5847.3  > 21.63
-----------------------------------------------------

The quoted upper limits have not been corrected for the expected Galactic 
extinction along the line of sight corresponding to a reddening of E(B-V) 
= 0.01 mag. All photometry is on the UVOT light flight system described in 
Poole et al. (2008, MNRAS, 383, 627).