GCN Circular 21220
Subject
GRB 170607A: Swift/UVOT Detection
Event
Date
2017-06-08T12:56:36Z (8 years ago)
From
Sam Emery at MSSL-UCL <samuel.emery.15@ucl.ac.uk>
S.W.K. Emery (UCL-MSSL) and A. D'Ai (INAF-IASFPA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 170607A
84 s after the BAT trigger (D'Ai et al., GCN Circ. 21214).
GRB 170607A was also triggered by Fermi GBM
(Hamburg and Meegan GCN Circ. 21218)
We detect a fading afterglow consistent with the position given by XRT
(Beardmore et al., GCN Circ. 21215) and ground-based optical detections
(Heintz et al., GCN Circ. 21217; Lipunov et al., GCN Circ. 21219).
The preliminary UVOT position is:
RA (J2000) = 00:29:27.82 = 7.36591 (deg.)
Dec (J2000) = +09:14:36.0 = 9.24334 (deg.)
with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).
Preliminary detections 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_FC 84 233 147 15.76 +/- 0.02
white 575 5285 461 17.11 +/- 0.03
white 6895 7065 197 17.50 +/- 0.04
v 625 5696 313 17.51 +/- 0.11
b 551 1859 132 17.63 +/- 0.09
u_FC 295 545 246 16.14 +/- 0.04
u 699 6205 210 16.80 +/- 0.06
u 6454 29372 1601 17.68 +/- 0.04
uvw1 847 6105 313 16.87 +/- 0.06
uvm2 5700 5900 197 16.86 +/- 0.09
uvw2 1720 5491 216 17.04 +/- 0.07
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.04 in the direction of the burst
(Schlegel et al. 1998).