[vsnet-grb-info 27809] GRB 210413B: Swift/UVOT Observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Fri Apr 30 09:55:42 JST 2021
TITLE: GCN CIRCULAR
NUMBER: 29912
SUBJECT: GRB 210413B: Swift/UVOT Observations
DATE: 21/04/30 00:54:43 GMT
FROM: Mike Siegel at PSU/Swift MOC <mhs18 at 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.
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