[vsnet-grb-info 14140] GRB 131105A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15454
SUBJECT: GRB 131105A: Swift/UVOT Upper Limits
DATE:    13/11/05 11:40:36 GMT
FROM:    Massimiliano de Pasquale at MSSL-UCL  <m.depasquale at ucl.ac.uk>

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

The Swift/UVOT began settled observations of the field of GRB 131105A
295 s after the BAT trigger (Cummings et al., GCN Circ. 15446).
No optical afterglow consistent with the optical position
(Xu et al. GCN Circ. 15447) 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           295          444          147         >21.5
white              295         1544          353         >22.0
v                  774         1594           97         >19.3
b                 1152         1520           58         >19.9
u                  848         1495           78         >19.8
w1                 823         1471           78         >19.4
m2                 798         1619           39         >18.4
w2                 750         1570           78         >19.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).