[vsnet-grb-info 15580] GRB 140930B: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16869
SUBJECT: GRB 140930B: Swift/UVOT Upper Limits
DATE:    14/10/01 13:22:17 GMT
FROM:    Alice Breeveld at MSSL-UCL  <a.breeveld at ucl.ac.uk>

A. A. Breeveld (UCL-MSSL) and M. De Pasquale (INAF-IASFPA) report on 
behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 140930B 
201s after the BAT trigger (De Pasquale et al., GCN Circ. 16857).
No optical afterglow consistent with the XRT position (Goad et al., GCN 
Circ. 16865) or the optical position (Tanvir et al., GCN Circ. 16861) 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           201          351          147         >20.2
white              201         2579          528         >20.9
v                  507         2629          253         >18.8
b                  433         2787          311         >19.9
u                  407         2702          253         >19.4
w1                 383         2678          253         >19.4
m2                 358         2653          214         >19.3
w2                 483         2605          253         >19.7

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).