[vsnet-grb-info 15154] GRB 140622A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16446
SUBJECT: GRB 140622A: Swift/UVOT Upper Limits
DATE:    14/06/23 19:35:49 GMT
FROM:    Frank Marshall at GSFC  <femarsha at khamseen.gsfc.nasa.gov>

F. E. Marshall (NASA/GSFC) and V. D'Elia (ASDC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 140622A
97 s after the BAT trigger (D'Elia et al. GCN Circ. 16433).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 16434) 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            97          246          147         >21.2
u_FC               309          559          246         >20.0
white               97         1358          373         >21.2
v                  639         1407           97         >19.6
b                  564         1334           78         >20.1
u                  309         1309          304         >20.2
w1                 688         1285           58         >19.6
m2                 663         1260           78         >20.6
w2                 614         1383           97         >20.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.07 in the direction of the burst
(Schlegel et al. 1998).