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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17825, 17826
Message-Id: <20260602070512.A012E28807C7@server.astronomerstelegram.org>
Date: Tue,  2 Jun 2026 03:05:12 -0400 (EDT)

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ATEL #17825							     ATEL #17825

Title:	EP260530a/AT2026nwl: refined analysis of the EP-FXT observation
Author:	W. F. Wen (SZTU), C. Y. Dai (NJU), Q. Y. Wu, H. Sun (NAO,
		CAS)
Queries:	ep_ta@bao.ac.cn
Posted:	1 Jun 2026; 08:50 UT
Subjects:X-ray, Nova, Transient

Following the detection of the X-ray transient EP260530a (Wu et al., ATel
17824), we performed a follow-up observation with the Follow-up X-ray Telescope
(FXT) on board the Einstein Probe mission. The observations began at 2026-05-31T05:53:39,
about 22 hours after the EP-WXT detection. The exposure time is 2.5 ks.
Within the WXT error circle, an uncatalogued X-ray source was detected
at R.A. = 186.1046 deg, DEC = 28.7857 deg, with an uncertainty of 10 arcsec
(radius, 90% C.L. statistical and systematic), which is 3 arcsec away from
the position of the optical counterpart AT2026nwl. The spectrum can be
fitted with a power-law plus a blackbody with a free NH. The best-fit results
yield a photon index Gamma=1.3+/-0.3, the temperature kT = 0.054 +/-0.001keV
and NH<2.8e20 cm-2. The derived unabsorbed flux in the 0.3-10 keV band
is 5.3(-0.8, +0.9)E-11 erg/s/cm2 (90% C.L.).

Launched on January 9, 2024, EP is a space X-ray observatory to monitor
the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook
of X-ray and Gamma-ray Astrophysics).

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Password Certification: Yuan Liu (liuyuan@bao.ac.cn)
https://www.astronomerstelegram.org/?read=17825
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ATEL #17826							     ATEL #17826

Title:	Discovery of a Probable Nova in M31, M31N 2026-06a
Author:	K. Hornoch, H. Kucakova (Ondrejov), A. W. Shafter (SDSU)
Queries:	k.hornoch@centrum.cz
Posted:	2 Jun 2026; 02:24 UT
Subjects:Optical, Nova, Transient

We report the discovery of a probable nova found during our survey of the
central region of M31. The object was discovered on a co-added 600-s R-band
CCD frame taken on 2026 Jun. 2.029 UT with the 0.65-m telescope at Ondrejov.

The object was designated as M31N 2026-06a = PNV J00424164+4115162 and
is located at R.A. = 0h42m41s.64, Decl. = +41o15'16".2 (equinox 2000.0),
which is 30.3" west and 52.3" south of the center of M31 (see link to discovery
image below).

The following R-band magnitudes were obtained using the 0.65-m telescope
(D65):

<span class="inner-pre" style="font-size: 13px"> 
Date [UT]    |  Mag   | Err  | Filter  | Telescope

2026-05-24.069 | >19.2  |      | R       | D65 
2026-06-02.029 |  17.4  | 0.15 | R       | D65 
2026-06-02.030 |  17.5  | 0.15 | R       | D65

</span>

As with all extragalactic novae, follow-up spectroscopic and photometric
observations to confirm the nova's nature and determine its spectroscopic
class and rate of decline (speed class) are encouraged.

Discovery image: http://www.asu.cas.cz/~asteroid/M31N2026-06a.png
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