MAXI J1820+070: Swift/UVOT counterpart correction
ATel #11404; J. A. Kennea and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory
on 12 Mar 2018; 02:53 UT
Credential Certification: Jamie A. Kennea (kennea@astro.psu.edu)
Referred to by ATel #: 11406, 11418, 11423, 11426, 11427, 11432, 11437, 11439, 11440, 11445, 11510, 11723, 11831, 11899
In ATEL #11403 the UVOT counterpart reported was incorrect, and was in fact
an unrelated star near the XRT position. In the UVOT prompt white image we
detect a bright source, which has considerable brightening over archival
images of the field, at the following coordinates, RA/Dec(J2000) = 75.09138,
7.1853, which is equivalent to:
RA(J2000) = 18h 20m 21.93s,
Dec(J2000) = +07d 11m 07.1s
This source lies 0.36 arc-seconds from the source ASASSN-18el (ATEL #11400),
and is therefore the same source.
We note that the XRT position is 10.5 arc-seconds from the UVOT/ASASSN
position, however, given the brightness of the XRT source, we believe it is
the same object as MAXI J1820-070 and the associated ASASSN-18el.
We apologize any confusion.
