GCN Circular 19568
Subject
GRB 160623A: Swift/UVOT Upper Limits
Date
2016-06-24T19:31:52Z (8 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
Alice Breeveld (UCL-MSSL) and A. Maselli (INAF-IASFPA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 160623A
40254 s after the LAT trigger (Vianello et al., GCN Circ. 19553).
No optical afterglow consistent with the XRT position (Mingo et al. GCN
Circ. 19558) or the Mondy and RATIR position (Pozanenko et al. GCN Circ.
19561; Butler et al. GCN Circ. 19567) is detected in the initial UVOT
exposures.
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
v 40657 51652 2859 >21.1
u 40254 51253 2008 >21.5
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 1.35 in the direction of the
burst (Schlegel et al. 1998).