[vsnet-grb-info 18728] GRB 161113A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20177
SUBJECT: GRB 161113A: Swift/UVOT Upper Limits
DATE:    16/11/15 13:15:18 GMT
FROM:    Alice Breeveld at MSSL-UCL  <a.breeveld at ucl.ac.uk>

A. A. Breeveld (UCL-MSSL), P. D'Avanzo (INAF-OAB) and S. W. K. Emery 
(UCL-MSSL) report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 161113A 61 
s after the BAT trigger (D'Avanzo et al., GCN Circ. 20172).
No optical afterglow consistent with the XRT position (Evans et al. GCN 
Circ. 20174) 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) 
exposures and subsequent exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            61          211          147         >19.8
u_FC               274          483          206         >18.8
white              555         6332          369         >21.0
v                 5152         5352          197         >19.2
b                 4537         6171          393         >20.1
u                  274         5966          599         >19.6
w1                4126         5762          393         >20.1

The magnitudes in the table are not corrected for the Galactic 
extinction due to the reddening of E(B-V) = 0.02 in the direction of the 
burst (Schlegel et al. 1998).