MAXI J1820+070: Errata and updated XRT Position
ATel #11406; J. A. Kennea (PSU)
on 12 Mar 2018; 11:57 UT
Credential Certification: Jamie A. Kennea (kennea@astro.psu.edu)
Subjects: Ultra-Violet, X-ray, Black Hole
Referred to by ATel #: 11418, 11420, 11423, 11424, 11426, 11427, 11432, 11437, 11439, 11440, 11445, 11451, 11458, 11488, 11510, 11723, 11831, 11833, 11899
In ATEL #11404 on MAXI J1820+070, there are some errors, which we correct here. The decimal coordinates of the UVOT source should be:
RA/Dec(J2000) = 275.09138, 7.1853
The sexagesimal coordinates are correct. Also the optical counterpart should have been named ASASSN-18ey, and the correct name of the MAXI source is MAXI J1820+070. Apologies for these errors.
Utilizing ground processed data, we calculate an updated XRT position for this transient. The coordinates are RA/Dec(J2000) = 275.09118, 7.18563,
RA(J2000) =18h 20m 21.88s,
Dec(J2000) = +07d 11m 08.3s),
with an error radius of 1.5 arc-seconds (90% confidence), 1.4 arc-seconds from the position of ASSASN-18ey (ATEL #11400). This updated position therefore removes the discrepancy between the optical and X-ray position.
