GCN Circular 15515

Subject

GRB 131122A: Swift/UVOT Upper Limits

Event

Date

2013-11-23T15:59:12Z (13 years ago)

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. 15510Loading...
 
 ).
No optical counterpart consistent with the potential XRT afterglow position
(Maselli et al., GCN Circ. 15513Loading...
 
 ) 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).