GCN Circular 12057
Subject
GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
Date
2011-05-31T14:14:04Z (13 years ago)
From
Frank Marshall at GSFC <femarsha@khamseen.gsfc.nasa.gov>
F. E. Marshall (NASA/GSFC) and P. D'Avanzo (INAF-OAB)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 110530A
438 s after the BAT trigger (D'Avanzo et al., GCN Circ. 12046).
A fading source consistent with the enhanced XRT position
(Evans et al., GCN Circ. 12055) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 18:48:16.40 = 282.06833 (deg.)
Dec (J2000) = +61:55:44.9 = 61.92913 (deg.)
with an estimated uncertainty of 0.65 arc sec. (radius, 90% confidence).
Preliminary detections using the UVOT photometric system
(Poole et al. 2008, MNRAS, 383, 627) for the early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 438 1015 295 20.31 +/- 0.10
white 7070 8315 1042 21.52 +/- 0.21
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.06 in the direction of the burst
(Schlegel et al. 1998).