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ATEL #16102							    ATEL #16102

Title:	GRS 1739-278 has been at an outburst state since 2023 June
		22, as detected with LEIA
Author:	GRS 1739-278 has been at an outburst state since 2023 June
		22, as detected with LEIA
Queries:	ep_ta@bao.ac.cn
Posted:	28 Jun 2023; 15:36 UT
Subjects:X-ray, Binary, Black Hole

Negoro et al. (ATel #16097) report the detection of a possible new outburst
of GRS 1739-278 on June 26, 2023, which is confirmed by a Swift/XRT observation
on June 27, 2023 (Kennea et al., ATel #16100). We report that around this
position a source  (RA=265.676, Dec=-27.73, 90% uncertainty=2 arcmin) was
detected with LEIA at a flux of (4.6 +/- 2.0)E-9 erg/s/cm^2 at 2023-06-22T09:43:27,
which is spatially consistent with GRS 1739-278. We thus suggest that GRS
1739-278 has already been at an outburst state since June 22, 2023, and
exhibits flux variations by a factor of ~3.

Prior to June 7, GRS 1739-278 remained undetected in all observations of
LEIA with a typical cadence of ~10 days and a typical exposure time of
~700s each, setting an upper limit of ~4e-11 erg/s/cm2. The X-ray spectrum
taken at 2023-06-22T09:43:27 can be well fitted with an absorbed powerlaw
with N_H=(2.2 +/- 0.7)E22 cm^-2, and a photon index of 2.9+/-0.8. The unabsorbed
0.5-4.0 keV flux was (4.6 +/- 2.0)E-9 erg/s/cm^2, which increased by a
factor of ~3 about 11 hours later. There have been 8 detections of the
outburst with LEIA since June 22, 2023. In the latest LEIA observation
at 2023-06-25T10:00:19, the source remains in the outburst state with 0.5
- 4.0 keV unabsorbed flux to be (2.6 +/- 0.8)E-8 erg/s/cm^2.

LEIA (Zhang et al, ApJL, 941, 2) is a soft X-ray lobster-eye imager (0.5
- 4.0 keV) with a FoV of 340 square degrees aboard the experimental satellite
SATech-01 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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Password Certification: Yuan Liu (liuyuan@bao.ac.cn)
https://www.astronomerstelegram.org/?read=16102

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ATEL #16105							    ATEL #16105

Title:	Erratum to ATel #16102: GRS 1739-278 has been at an outburst
		state since 2023 June 22, as detected with LEIA
Author:	D. Y. Li, Y. L. Wang, M. Sugizaki, Z. X. Ling, Y. Liu, C.
		Zhang, H. Q. Cheng, C. Z. Cui, D. W. Fan, H. B. Hu, J. W. Hu, M. H.
		Huang, C. C. Jin, H. Y. Liu, M. J. Liu, H. W. Pan, H. Sun, 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:	liuyuan@bao.ac.cn
Posted:	29 Jun 2023; 09:51 UT
Subjects:X-ray, Binary, Black Hole

In ATel #16102, by mistake the communication was sent without author list.
We sincerely apologize for this error in our part. 

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Password Certification: Yuan Liu (liuyuan@bao.ac.cn)
https://www.astronomerstelegram.org/?read=16105
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