TITLE:   GCN CIRCULAR
NUMBER:  14928
SUBJECT: GRB 130625A: Swift/UVOT Upper Limits
DATE:    13/06/25 20:34:02 GMT
FROM:    Mike Siegel at PSU/Swift MOC  <siegel@swift.psu.edu>

J. S. Linevsky (PSU/CBHS), M. H. Siegel (PSU), and
D. Grupe (PSU)  report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 130625A
102 s after the BAT trigger (Grupe et al., GCN Circ. 14923).
No optical afterglow consistent with the enhanced XRT position
(Grupe et al. GCN Circ. 14924) is detected in the initial UVOT exposures.

Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposure and subsequent exposures are:

Filter  T_start(s)  T_stop(s)  Exp(s)  Mag 

white_FC    102      252       147    >20.96  
white       595     1890       283    >21.34 
v           644     1940       155    >19.34   
b           570     1866       136    >20.21  
u_FC        315      565       245    >20.26  
u           315     2003       617    >20.81 
uvw1        694     1989       136    >19.60     
uvm2        844     6816       332    >20.04  
uvw2        620     1916       155    >19.79   

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.22 in the direction of the burst
(Schlegel et al. 1998).