[vsnet-grb-info 15257] GRB 140709A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16549
SUBJECT: GRB 140709A: Swift/UVOT Upper Limits
DATE:    14/07/09 11:53:44 GMT
FROM:    Paul Kuin at MSSL  <npkuin at gmail.com>

N. P. M. Kuin (UCL-MSSL) and L. M. Z. Hagen (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 140709A
93 s after the BAT trigger (Hagen et al., GCN Circ. 16546).  No optical
afterglow consistent with the XRT position (Evans et al. GCN Circ. 16548)
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            93          242          147         >21.0
white               93         2199          186         >21.3
v                 2055         5878          216         >19.8
b                 1979        12414          848         >21.8
u                  305         6434          330         >20.5
w1                2104         6288          216         >20.2
m2                5883         6083          197         >19.9
w2                2030         2050           19         >19.7

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.40 in the direction of the burst
(Schlegel et al. 1998).