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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17963, 17964
Message-Id: <20260814070459.1B5DE288094E@server.astronomerstelegram.org>
Date: Fri, 14 Aug 2026 03:04:59 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17963							     ATEL #17963

Title:	MAXI/GSC detection of a new X-ray nova MAXI J1750-327
Author:	H. Negoro (Nihon U.), S. Kobayashi (Kyoto U.), M. Serino (AGU),
		 M. Nakajima, K. Saito, T. Yokoyama, M. Wada (Nihon U.),  T. Mihara,
		T. Tamagawa, N. Kawai, M. Matsuoka (RIKEN),  T. Sakamoto, S. Sugita,
		Y. Kawakubo, H. Hiramatsu, A. Yoshida (AGU),  Y. Tsuboi, Y. Ishihara,
		H. Ogaki (Chuo U.),  M. Shidatsu, C. Kang, M. Uenishi, T. Usuki, S.
		Yatsuzuka, H. Aoe (Ehime U.), I. Takahashi, Y. Yatsu (Science Tokyo),
		S. Nakahira, S. Ueno, H. Tomida, M. Kurihara (JAXA),  Y. Ueda, K.
		Fujiwara (Kyoto U.), M. Yamauchi, M. Nishio, C. Hiraizumi (Miyazaki
		U.),  K. Yamaoka (Nagoya U.), M. Sugizaki (Kanazawa U.), W. Iwakiri
		(Chiba U.), T. Kawamuro (Osaka U.), S. Yamada (Tohoku U), and S. Ogawa
		(TUS)
Queries:	negoro.hitoshi@nihon-u.ac.jp
Posted:	13 Aug 2026; 08:45 UT
Subjects:X-ray, Black Hole, Neutron Star

The MAXI/GSC nova alert system triggered on a bright X-ray transient source
at 02:41 UT on August 13, 2026. Assuming that the source flux was constant
over four transits from 01:09 to 05:48 on August 13, we obtain the source
position at

(R.A., Dec) = (267.736 deg, -32.734 deg) = (17 50 56.6, -32 44 02) (J2000)

with a statistical 90% C.L. elliptical error region with long and short
radii of 0.17 deg and 0.19 deg, respectively. The roll angle of long axis
from the north direction is 15.0 deg counterclockwise. There is an additional
systematic uncertainty of 0.1 deg (90% containment radius). The X-ray flux
averaged over the scan was 117 +- 12 mCrab (4.0-10.0keV, 1 sigma error).

Since the black hole candidate SLX 1746-331 is clearly out of the error
region and there is no known bright catalogued X-ray transient source,
we tentatively designate the source MAXI J1750-327. Followup-observations
are highly recommend to reveal the nature of the source.

Trigger Information: https://maxi.riken.jp/alert/novae/1265175470/1265175470.htm
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Password Certification: Hitoshi Negoro (negoro@phys.cst.nihon-u.ac.jp)
https://www.astronomerstelegram.org/?read=17963
==============================================================================
ATEL #17964							     ATEL #17964

Title:	Einstein Probe detection of a likely new X-ray transient
Author:	G. L. Huang (IHEP), A. Li (BNU), C. Y. Wang (THU), W. D. Zhang
		(NAOC) on behalf of the Einstein Probe team
Queries:	ep_ta@bao.ac.cn
Posted:	13 Aug 2026; 14:49 UT
Subjects:X-ray, Binary, Transient

We report the detection of a new X-ray transient by the Wide-field X-ray
Telescope (WXT) onboard the Einstein Probe (EP), designated EP260812c.
EP-WXT first detected the current outburst at 2026-08-12T20:10:43 (UTC),
with a flux of about 7.43×10^-11 erg/cm^2/s, located at (R.A., DEC) =
(267.4863 deg, -32.7155 deg) and (Galactic I, b) = (357.243 deg, -2.747
deg), with a 90% positional uncertainty radius of 2.2 arcmin. A simple
absorbed power-law model yielded a photon index of approximately 1.5 (-1.5/+1.7)
and an absorption column density of 1.2 (-1.0/+1.4) x10^22 (90% C.L. statistical
and systematic). We note that an X-ray nova was newly detected by MAXI
at a position 12.6 arc-minutes away (Atel #17963, Negoro et al. 2026).
Given the positional uncertainty of MAXI/GSC , we consider the EP-WXT and
MAXI detections to be the same source. We also note that within the WXT
error circle there is an X-ray source 1eRASS J175013.2-324130. Further
observations are needed to pin down the source position so as to confirm
whether the X-ray outburst detected by EP and MAXI is associated with 1eRASS
J175013.2-324130.

The source was further detected in later WXT observations as follows, indicating
that the source is still brightening.

UTC			                      flux [x10^-11 erg/cm^2/s]

2026-08-13T03:08:53	      29.7

2026-08-13T04:10:58         58.0

2026-08-13T10:32:58         129.0

Follow-up observations by EP-FXT have been scheduled. Multi-wavelength
follow-up observations are encouraged to identify the nature of this likely
new X-ray transient.

Launched on January 9, 2024, EP is a space X-ray observatory designed to
monitor the soft X-ray sky with rapid X-ray follow-up capability (Yuan
et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). EP is a mission
of the Chinese Academy of Sciences in collaboration with ESA, MPE, and
CNES.

MAXI/GSC detection of a new X-ray nova MAXI J1750-327: https://www.astronomerstelegram.org/?read=17963
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Password Certification: Yuan Liu (liuyuan@bao.ac.cn)
https://www.astronomerstelegram.org/?read=17964
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