TITLE:   GCN CIRCULAR
NUMBER:  14136
SUBJECT: GRB 130102A: Swift/UVOT Upper Limits
DATE:    13/01/04 22:36:12 GMT
FROM:    Tyler Pritchard at PSU  <tapritchard@astro.psu.edu>

T. A. Pritchard (PSU) and K. L. Page (U Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 130102A
126 s after the BAT trigger (Page et al., GCN Circ. 14127).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 14129)
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           126          276          147         >21.1
u_FC               284          534          246         >20.4
white              126         7587          844         >22.4
v                  614        12045         1343         >20.9
b                  540         7382          549         >20.8
u                  284         7177          775         >20.5
w1                 664         6972          549         >20.2
m2                 639        12641          934         >20.7
w2                 590         7794          568         >20.7

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 1.90 in the direction of the burst
(Schlegel et al. 1998).