TITLE: GCN CIRCULAR NUMBER: 38110 SUBJECT: GRB 241105A: Swift/UVOT Detection DATE: 24/11/07 13:18:53 GMT FROM: Mike Siegel at PSU/Swift MOC mhs18@psu.edu
M. H. Siegel (PSU) reports on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 241105A 38.4 ks after the Fermi trigger (GCN Circ. 38085). A faint fading source is detected consistent with the XRT position (Kennea et al., GCN Circ. 38098) and the reported optical counterparts (Julakanti et al., GCN Circ. 38088, Izzo, GCN. Circ. 38097, Wei et al., GCN Circ. 38099, Hu et al., GCN Circ 38106).
The preliminary UVOT position is: RA (J2000) = 04:24:58.96 = 66.24568 (deg.) Dec (J2000) = -49:45:09.8 = -49.75271 (deg.) with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).
Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 38363 67383 4551 21.46+/-0.11 white 90644 106641 4612 >22.76
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.011 in the direction of the burst (Schlegel et al. 1998).
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