[vsnet-grb-info 14704] GRB 140320A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16018
SUBJECT: GRB 140320A: Swift/UVOT Upper Limits
DATE:    14/03/21 11:18:38 GMT
FROM:    Samantha Oates at MSSL  <sro at mssl.ucl.ac.uk>

S. R. Oates (UCL-MSSL) and J. K. Cannizzo (NASA/UMBC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 140320A
3723 s after the BAT trigger (Cannizzo et al., GCN Circ. 16000).
No optical afterglow consistent with the enhanced XRT position
(Page et al., GCN Circ 16011) 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

v                 3723         5358          393         >19.2
b                 4543        10186         1149         >20.8
u                 4338         5973          393         >19.7
w1                4133         5768          393         >19.8
m2                3928         5563          393         >20.0
w2                3518         5153          393         >20.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.51 in the direction of the burst
(Schlegel et al. 1998).