[vsnet-grb-info 16014] GRB 150110B: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17296
SUBJECT: GRB 150110B: Swift/UVOT Upper Limits
DATE:    15/01/11 06:47:06 GMT
FROM:    Paul Kuin at MSSL  <npkuin at gmail.com>

N. P. M. Kuin (UCL-MSSL) and P. A. Evans (U Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 150110B
65 s after the BAT trigger (Evans et al., GCN Circ. 17291).  No optical
afterglow consistent with the XRT position  (Beardmore et al., GCN
Circ. 17294)  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            65          215          147         >21.0
u_FC               277          527          246         >20.3
white               65        12665         1414         >21.7
v                  607         6471          452         >19.6
b                  532        11960         1140         >21.5
u                  277        11047         1394         >21.1
w1                 656         6881          452         >20.4
m2                 631         6676          452         >20.5
w2                 582         6267          452         >20.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.20 in the direction of the burst
(Schlegel et al. 1998).