***Instant Email Notice***: Transients

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ATEL #15834							    ATEL #15834

Title:	LEIA discovered an X-ray transient LXT 221227A
Author:	H. Q. Cheng, Z. X. Ling, Y. Liu, C. Zhang, M. J. Liu, C. Z.
		Cui, D. W. Fan, H. B. Hu, J. W. Hu, M. H. Huang, C. C. Jin, D. Y.
		Li, J. Q. Li, H. Y. Liu, H. Sun, H. W. Pan, W. X. Wang, Y. L. Wang,
		Q. Y. Wu, X. P. Xu, Y. F. Xu, H. N. Yang, M. Zhang, W. D. Zhang, D.
		H. Zhao and W. Yuan (NAOC, CAS), on behalf of the LEIA and Einstein
		Probe team
Queries:	ep_ta@nao.cas.cn
Posted:	30 Dec 2022; 02:09 UT
Subjects:X-ray, Transient

LEIA (Lobster Eye Imager for Astronomy), also known as EP-WXT Pathfinder,
detected a new X-ray transient, named LXT 221227A, on December 27, 2022.
The source position is R.A. = 147.454 deg, DEC = 4.677 deg (J2000), with
an uncertainty of 2.2 arcmin (radius, 90% C.L. statistical and systematic).
The source was detected at a significance of 5.9 with 14 net photons. Assuming
an absorbed power-law model with a photon index of 2.0 and a Galactic absorption
of 3.3x10^19 cm^-2, the flux in the 0.5-4.0 keV is 1.8x10^-11 erg/cm^2/s.

No known X-ray sources were found around this position. This position was
also covered in two previous observations of LEIA at 2022-12-19T20:33:20
and 2022-12-22T19:30:44. While no X-ray sources were detected within the
error circle of LXT 221227A. The preliminary short-term light curve of
LXT 221227A shows a possible trend of declining, though with a large uncertainty
due to the small number of counts.

Follow-up observations are encouraged to identify this new transient.

LEIA (Zhang et al. 2022, ApJ, 941, 2) is a soft X-ray Lobster-eye imager
(0.5 - 4.0 keV) with a FoV of 340 square degrees aboard the SATech-01 satellite
of the CAS, launched on July 27, 2022. The above result is preliminary
and the final result will be published elsewhere. 

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