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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17751
Message-Id: <20260413070618.F309328807C3@server.astronomerstelegram.org>
Date: Mon, 13 Apr 2026 03:06:18 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17751							     ATEL #17751

Title:	Einstein Probe detection of a new outburst from XRB IGR J17331-2406
Author:	A. Li (BNU), C. Y. Wang (THU), X. H. Tang (THU), Z. X. Ling
		(NAO, CAS) on behalf of the Einstein Probe team
Queries:	ep_ta@bao.ac.cn
Posted:	12 Apr 2026; 10:07 UT
Subjects:X-ray, Transient

We report the detection of a new outburst from XRB IGR J17331-2406 with
the Wide-field X-ray Telescope (WXT) onboard the Einstein Probe (EP). The
source was discovered in 2004 (Atel #328) and has exhibited multiple outbursts
in gamma-ray band since then. EP/WXT first detected the current outburst
at 2026-04-02T02:52:30 (UTC), with a flux of about 1.1e-11 erg/cm^2/s.

Since then, the source was detected as follows,

UTC			flux [1e10^-11 erg/cm^2/s]

2026-04-02T23:09:39	 	1.7

2026-04-07T02:36:27	 	2.3

2026-04-07T10:09:54	 	2.2

2026-04-08T21:42:58	 	1.8

The latest FXT observation started at 2026-04-11T19:32:48 and has an exposure
time of 2995 s, its spectrum can be fitted with an absorbed power-law model,
with a photon index of 1.0 +/- 0.1, with a column density fixed at the
Galactic value of 3.02e21 cm^-2. The current unabsorbed flux in 0.5-10.0
keV is 6.9(+3.1,-3.2)e-11 erg/cm^2/s (68% confidence level). Further follow-up
observations are encouraged.

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.

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Password Certification: Yuan Liu (liuyuan@bao.ac.cn)
https://www.astronomerstelegram.org/?read=17751
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