GCN Circular 29912
Subject
GRB 210413B: Swift/UVOT Observations
Date
2021-04-30T00:54:43Z (3 years ago)
From
Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>
M. H. Siegel (PSU) and A. Tohuvavohu (U Toronto) report on behalf of the Swift/UVOT team:
Swift/UVOT performed follow-up observations of the Swift/BAT-detected burst GRB 210413B
(Tohuvavohu et al., GCN Circ. 29819) 185 ks after the BAT trigger. We detect a faint source
close to the XRT source reported by Kennea et al. (GCN Circ. 29827).
The preliminary UVOT position is:
RA (J2000) = 12:10:07.75 = 182.53230 (deg.)
Dec (J2000) = +56:02:58.9 = 56.04970 (deg.)
with an estimated uncertainty of 0.4 arc sec. (radius, 90% confidence).
The preliminary detection using the UVOT photometric system (Breeveld et al. 2011, AIP Conf.
Proc. 1358, 373) is wh=19.68+-0.03 mag (Vega) or wh=20.48+-0.03 mag (AB).
We note, however, that the DECaLs survey shows faint source at this position at a g magnitude
of 21.09 mag (AB). It is thus not clear if this detection represents a brightening of that source,
which could indicate a host galaxy.