[vsnet-grb-info 15330] GRB 140709B: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16622
SUBJECT: GRB 140709B: Swift/UVOT Upper Limits
DATE:    14/07/23 11:23:28 GMT
FROM:    Craig Swenson at PSU/Swift  <cswenson at astro.psu.edu>

C. A. Swenson (PSU) reports on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 140709B
97 s after the BAT trigger (Swenson et al., GCN Circ. 16551).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 16556)
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          4835         4985          147         >20.8
u_FC                97          346          246         >20.6
white             4835         6626          541         >21.7
v                  633         7037          491         >20.5
b                  352         6422          534         >20.9
u                   97         6216          668         >21.2
w1                 683        11259          922         >20.8
m2                1087         7230          440         >21.2
w2                 758         6832          471         >20.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.04 in the direction of the burst
(Schlegel et al. 1998).