[vsnet-grb-info 15523] GRB 140909A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16812
SUBJECT: GRB 140909A: Swift/UVOT Upper Limits
DATE:    14/09/10 19:02:50 GMT
FROM:    Mike Siegel at PSU/Swift MOC  <siegel at swift.psu.edu>

GRB 140909A: Swift/UVOT Upper Limits

M. H. Siegel (PSU) and E. Sonbas (Adiyaman Univ.)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 140909A
44028 s after the BAT trigger (Palmer et al., GCN Circ. 16808).
No optical afterglow consistent with the XRT position
(Pagani et al. GCN Circ. 16811) is detected in the initial UVOT exposure.
The preliminary 3-sigma upper limit using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposure is:

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

white            44028        56310         3213         >22.0

The magnitude is not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.015 in the direction of the burst
(Schlegel et al. 1998).