[vsnet-grb-info 13804] GRB 130822A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15118
SUBJECT: GRB 130822A: Swift/UVOT Upper Limits
DATE:    13/08/23 09:44:03 GMT
FROM:    Alice Breeveld at MSSL-UCL  <a.breeveld at ucl.ac.uk>

A. A. Breeveld (UCL-MSSL) and D. Kocevski (NASA/GSFC/ORAU) report on 
behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 130822A 81 
s after the BAT trigger (Kocevski et al., GCN Circ. 15112).
No optical afterglow consistent with the XRT position (Beardmore et al. 
GCN Circ. 15117) 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            81          231          147         >20.8
u_FC               295          544          246         >20.7
white               81         1543          392         >21.4
v                  624         1420           97         >19.3
b                  550         1170           58         >20.1
u                  295         1145          265         >20.9
w1                 674         1470           97         >19.7
w2                 600          620           19         >19.4

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).