[vsnet-grb-info 14774] GRB 140408A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16088
SUBJECT: GRB 140408A: Swift/UVOT Upper Limits
DATE:    14/04/09 07:42:56 GMT
FROM:    Paul Kuin at MSSL  <npkuin at gmail.com>

N. P. M. Kuin (UCL-MSSL) and V. D'Elia (ASDC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 140408A
109 s after the BAT trigger (D'Elia et al., GCN Circ. 16082).
No optical afterglow consistent with the XRT position (Evans et al.,
GCN Circ. 16085,) and with the non-detection reported by Kuroda et al.
(GCN Circ. 16086), 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           109          259          147         >20.9
u_FC               321          571          246         >20.5
white              109         1025          334         >21.2
v                  652         4403          236         >20.0
b                  577          769           39         >18.7
u                  321          745          265         >20.5
w1                 701          720           19         >18.1
m2                 676         4572          201         >19.9
w2                 627         1046           54         >20.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.19 in the direction of the burst
(Schlegel et al. 1998).