GCN Circular 28025
Subject
GRB 200623A: Swift/UVOT Upper Limits
Date
2020-06-24T19:15:37Z (4 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL) and B. Sbarufatti (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began target-of-opportunity observations of the field of GRB 200623A 37910 s after
the Guano and GBM trigger (Fermi GBM team, GCN Circ. 28011; Debaunay et al., GCN Circ. 28013).
No significant new sources were found at the positions of the XRT candidate sources 1 and 3
(Tohuvavohu et al., GCN Circ. 28023). XRT source 2 was outside the field of view for all exposures.
Preliminary 3-sigma upper limit 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 37910 45836 4299 >22.4
The magnitude in the table is not corrected for the Galactic extinction due to the reddening of
E(B-V) = 0.012 in the direction of the burst (Schlegel et al. 1998).