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Swift/XRT observation of the X-ray transient SRGA J144459.2-604207

ATel #16471; Amar Deo Chandra (Aryabhatta Research Institute of Observational Sciences (ARIES), India)
on 22 Feb 2024; 14:19 UT
Credential Certification: Amar Deo Chandra (amar.deo.chandra@gmail.com)

Subjects: X-ray, Transient

Referred to by ATel #: 16474, 16475, 16476, 16477, 16480, 16483, 16487, 16489, 16495, 16499, 16510, 16511, 16551

A new, bright X-ray transient SRGA J144459.2-604207 was discovered by the SRG/Mikhail Pavlinsky ART-XC telescope (ATel #16464). MAXI/GSC observations of this region suggest that the source flux was increasing in the 2-10 keV band since February 15, 2024 (MJD 60355) and reached about ~100 mCrab on February 21, 2024 (MJD 60361; ATel #16469). A candidate counterpart 2MASS 14445957-6042066 was suggested to lie about 2.76 arcsec away from the source location (ATel #16470). 0.59 ks Swift/XRT target of opportunity observation was performed in Photon Counting (PC) mode on February 22, 2024 (MJD 60362) beginning at 01:24:02. We detected a piled-up X-ray source at the following location: RA/Dec(J2000) = 221.248375, -60.697972 which is equivalent to:

RA(J2000) = 14h 44m 59.61s, Dec(J2000) = -60d 41m 52.7s,

with an error radius of 3.5 arc-seconds (90% confidence). The location of this source is consistent with the reported location of SRGA J144459.2-604207 (ATel# #16464). During this observation, the estimated average count rate is about 43 cts/s in the 0.3-10 keV energy band. Swift/XRT observations confirm the X-ray activity from the X-ray transient SRGA J144459.2-604207. Follow-up multi-wavelength observations are encouraged. We thank the Swift Team and Observatory Duty Scientists who made these observations possible.