GCN Circular 30356
Subject
GRB 210702A: preliminary Swift/UVOT photometry
Date
2021-07-02T23:31:49Z (3 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
N. P. M. Kuin (UCL-MSSL) and A. Y. Lien (GSFC/UMBC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 210702A
104 s after the BAT trigger (Lien et al., GCN Circ. 30351).
A source consistent with the XRT position
(Lien et al. GCN Circ. 30351)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 11:14:18.70 = 168.57793 (deg.)
Dec (J2000) = -36:44:50.0 = -36.74723 (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 early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 104 254 147 15.70 +/- 0.02
b 3516 3716 197 15.46 +/- 0.03
u 316 361 44 11.37 +/- 0.05
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.121 in the direction of the burst
(Schlegel et al. 1998).