[vsnet-grb-info 15729] GRB 141031B: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17017
SUBJECT: GRB 141031B: Swift/UVOT Upper Limits
DATE:    14/11/01 11:09:58 GMT
FROM:    Samantha Oates at MSSL  <sro at mssl.ucl.ac.uk>

S. R. Oates (IAA-CSIC/UCL-MSSL) and B. P. Gompertz (U Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 141031B
120 s after the BAT trigger (Gompertz et al., GCN Circ. 16998).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 17009)
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           120          270          147         >21.0
u_FC               278          528          246         >20.3
white              120         6181          580         >21.8
v                  608        11035         1317         >20.6
b                  534         5976          432         >20.9
u                  278         5771          659         >20.9
w1                 658        12348          620         >20.7
m2                 633        11940         1121         >20.9
w2                 584         6386          432         >20.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.14 in the direction of the burst
(Schlegel et al. 1998).