[vsnet-grb-info 13981] GRB 131002B: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15295
SUBJECT: GRB 131002B: Swift/UVOT Upper Limits
DATE:    13/10/03 13:03:10 GMT
FROM:    Alice Breeveld at MSSL-UCL  <a.breeveld at ucl.ac.uk>

A. A. Breeveld (UCL-MSSL) and M. C. Stroh (PSU) report on behalf of the 
Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 131002B
62 s after the BAT trigger (Stroh et al., GCN Circ. 15284).
No optical afterglow consistent with the XRT position (Beardmore et al. 
GCN Circ. 15291) is detected in the initial UVOT exposures. There is a 
DSS source lying just on the edge of the XRT region at 05:00:29.386 
-75:42:07.58.
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            62          212          147         >21.8
white             5216         5416          197         >22.1
v                 5627         5826          197         >20.3
b                 5011         6512          260         >21.4
u                  275         6442          274         >21.0
w1                6037         6237          197         >20.4
m2                5832         6031          197         >20.1
w2                5422         5622          197         >20.5

The magnitudes in the table are not corrected for the Galactic 
extinction due to the reddening of E(B-V) = 0.12 in the direction of the 
burst (Schlegel et al. 1998).