[vsnet-grb-info 19135] GRB 170214A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20682
SUBJECT: GRB 170214A: Swift/UVOT Upper Limits
DATE:    17/02/16 07:17:01 GMT
FROM:    Alice Breeveld at MSSL-UCL  <a.breeveld at ucl.ac.uk>

A. A. Breeveld (UCL-MSSL) and A.P. Beardmore (U. Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 170214A
38603 s after the LAT trigger (Mailyan and Meegan, GCN Circ. 20675).
No optical afterglow consistent with the XRT’s source 1 position
(Beardmore et al., GCN Circ. 20679, Troja et al., GCN Circ. 20681)
is detected in the initial UVOT exposures. The source 3 position is just 
off the edge of the field of view.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for source 1 in the 
initial exposures are:

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

w1               38603        65287         4856         >21.0

The magnitude in the table is not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.36 in the direction of the burst
(Schlegel et al. 1998).