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).
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