LEIA discovered an X-ray transient LXT 221107A

ATel #15748; Z. X. Ling, Y. Liu, C. Zhang, D. Y. Li, H. Q. Cheng, C. Z. Cui, D. W. Fan, H. B. Hu, M. H. Huang, C. C. Jin, J. Q. Li, H. Y. Liu, M. J 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
on 9 Nov 2022; 11:52 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Yuan Liu (liuyuan@bao.ac.cn)

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LEIA (Lobster Eye Imager for Astronomy), also known as EP-WXT Pathfinder, detected a new X-ray transient on November 07, 2022. The source position is R.A. = 91.02 deg, DEC = 12.76 deg (J2000) with an uncertainty of 3 arcmin (radius, 90% C.L. statistical and systematic). The source has been detected in 9 observations of LEIA from 2022/11/07T06:26:36 to 2022/11/08T12:25:24, with a flux gradually rising from 7.7e-11 erg/s/cm2 to 3.6e-10 erg/s/cm2 in 0.5-4.0 keV. Its spectrum can be well fitted by a power-law with a photon index of ~1.2.

There is a ROSAT source (2RXS J060415.1+124554/HD 251108) within the error circle with a flux of 8.246e-12 erg/s/cm2 at a separation of 2.5 arcmin, which is fainter than the source detected by LEIA at least by a factor of 10.

Due to the unknown nature of this source, we tentatively identify this source as a new X-ray transient and name it as LXT 221107A.

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

LEIA (Zhang et al, ApJL submitted) 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.