TITLE:   GCN CIRCULAR
NUMBER:  15515
SUBJECT: GRB 131122A: Swift/UVOT Upper Limits
DATE:    13/11/23 15:59:12 GMT
FROM:    Craig Swenson at PSU/Swift  <cswenson@astro.psu.edu>

C. A. Swenson (PSU) and A. Maselli (INAF-IASFPA)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 131122A
13578 s after the INTEGRAL trigger (Gotz et al., GCN Circ. 15510).
No optical counterpart consistent with the potential XRT afterglow position
(Maselli et al., GCN Circ. 15513) 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 initial exposures are:

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

white            14302        20578          855         >21.3
v                20830        21061          227         >19.0
u                13578        20136         1375         >21.0

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).