TITLE:   GCN CIRCULAR
NUMBER:  38207
SUBJECT: GRB 241113A: Swift/UVOT Detection
DATE:    24/11/13 22:12:55 GMT
FROM:    Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>

A. A. Breeveld (UCL-MSSL) and M. H. Siegel (PSU) report on behalf of the Swift/UVOT team:

The Swift/UVOT began observations of the field of GRB 241113A 61 s after the BAT trigger (Siegel et al., GCN Circ. 38194) with a short settling exposure in v, and a longer finding chart exposure in the white filter.
A fading source consistent with the XRT position (Goad et al., GCN Circ. 38198) and also detected by Francile et al. (GCN Circ. 38195), Huertas Ferrer et al. (GCN Circ. 38197), Izzo et al. (GCN Circ. 38201) and Ferro et al. (GCN Circ. 38206) is detected in the initial UVOT exposures.

Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

v                   61           72           11         14.87 ± 0.07
white               82          183          100         15.90 ± 0.03
b                 5359         5559          197         20.18 ± 0.36
u                 5154         5354          197         19.80 ± 0.33
uvw1              4949         5149          197        >19.61
uvw2              4335         5970          393        >20.12
uvm2              4744         4944          197        >19.46


The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.030 in the direction of the burst (Schlegel et al. 1998).