[vsnet-grb-info 15444] GRB 140824A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16733
SUBJECT: GRB 140824A: Swift/UVOT Upper Limits
DATE:    14/08/24 15:25:09 GMT
FROM:    Paul Kuin at MSSL  <npkuin at gmail.com>

N. P. M. Kuin (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 140824A
80 s after the BAT trigger (Beardmore et al., GCN Circ. 16732).
No optical afterglow consistent with the XRT position (Beardmore et al.
GCN Circ. 16732) 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            80          229          147         >21.0
u_FC               292          542          246         >20.2
white               80         6901          688         >21.9
v                 5676         7226          309         >20.1
b                 5061         6696          393         >20.9
u                  292         6491          639         >20.6
w1                4651         6286          393         >20.0
m2                5881        11294         1082         >21.4
w2                5471         7107          393         >20.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).