TITLE:   GCN CIRCULAR
NUMBER:  36889
SUBJECT: GRB240713A: Swift/UVOT Upper LImits
DATE:    24/07/16 15:14:04 GMT
FROM:    Samantha Oates at University of Birmingham <samantha.oates@alumni.ucl.ac.uk>

S. R. Oates (Lancaster U.) reports on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 240713A
142 ks after the SVOM trigger (Schanne et al., GCN Circ. 36854).
No optical afterglow is found in the initial UVOT exposures.
The UVOT exposures include the positions of XRT sources 1 and 2, but
XRT source 3 is outside of the UVOT field of view (Perri et al., GCN 36884).
No optical source is found consistent with the XRT sources.

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            142975       156299        3969         >22.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).