Swift/XRT confirms brightening of the eruptive variable CD-56 1032B
ATel #16467; H. Negoro (Nihon U.), T. Mihara (RIKEN), J. A. Kennea (PSU), P. A. Evans, R. Eyles-Ferris (U. Leicester)
on 22 Feb 2024; 02:04 UT
Credential Certification: Hitoshi Negoro (negoro@phys.cst.nihon-u.ac.jp)
Following the MAXI detection of a short-lived soft X-ray transient GRB 240214A/1H 0451-560 (ATel #16445/GCN 35721, also see ATel #16448), we performed Swift/XRT ToO observations on February 14 beginning at 07:20 UT, about 5.6 hours later after the MAXI detection.
The XRT detects a bright X-ray source at the RA/Dec(J2000) = 73.3825, -55.8588 , which is equivalent to:
RA(J2000) = 04h 53m 31.80s,
Dec (J2000)= -55d 51' 31.7''
with an estimated error radius of 3.5 arc-seconds (90% confidence). This position lies 7.24 arc-seconds from the proper-motion corrected position of the eruptive variable CD-56 1032B also known as 1RXS J045330.2-555128 (also XMMSL2 J045330.4-555133).
The mean X-ray flux is 6.1 +/- 0.3 counts s^-1, corresponding to 1.3 x 10^-10 erg cm^-1 s^-1.
Taking account of the uncertainty of the localization of the XRT observation at that time and the flaring activity, we conclude that the MAXI source detection is likely to be the CD-56 1032 system.
