[vsnet-grb-info 14319] GRB 131229A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15633
SUBJECT: GRB 131229A: Swift/UVOT Upper Limits
DATE:    13/12/29 18:18:09 GMT
FROM:    Massimiliano de Pasquale at MSSL-UCL  <m.depasquale at ucl.ac.uk>

M. De Pasquale (UCL-MSSL) and M. J. Page (UCL-MSSL)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB131229A
159 s after the BAT trigger (Page et al., GCN Circ. 15627).
No optical afterglow consistent with the XRT enhanced position
(Evans et al. GCN Circ. 15631) 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

u_FC               159          408          246         >19.9
u                  159         6481          639         >20.4
v                 4434        18141         1889         >20.6
b                 4023        16459         2164         >21.6
w1                4844         6275          393         >19.8
w2                4230        17366         1279         >20.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.29 in the direction of the burst
(Schlegel et al. 1998).