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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17692, 17693
Message-Id: <20260221071137.E57BB288050A@server.astronomerstelegram.org>
Date: Sat, 21 Feb 2026 02:11:37 -0500 (EST)

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Posted: Within the last 24 hours
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ATEL #17692							     ATEL #17692

Title:	Discovery of a Probable Nova in M31, M31N 2026-02a
Author:	K. Hornoch, H. Kucakova (Ondrejov), A. W. Shafter (SDSU)
Queries:	k.hornoch@centrum.cz
Posted:	20 Feb 2026; 19:39 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 1080-s R-band
CCD frame taken on 2026 Feb. 20.738 UT with the 0.65-m telescope at Ondrejov.

The object was designated as M31N 2026-02a = PNV J00425133+4113491 and
is located at R.A. = 0h42m51s.33, Decl. = +41o13'49".1 (equinox 2000.0),
which is 79.0" east and 139.4" 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

2026-02-15.818 | >19.4  |      | R       | D65 
2026-02-20.738 |  18.3  | 0.1  | R       | D65 
2026-02-20.766 |  18.1  | 0.1  | 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/PNVJ00425133+4113491.png
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Password Certification: Allen W. Shafter (ashafter@sdsu.edu)
https://www.astronomerstelegram.org/?read=17692
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ATEL #17693							     ATEL #17693

Title:	Optical counterpart of the Gamma-ray source Fermi J0607.8+0843
Author:	Paolo Ochner (Università di Padova) Roberto Nesci (INAF/IAPS)
Queries:	roberto.nesci@inaf.it
Posted:	20 Feb 2026; 22:19 UT
Subjects:Optical, Gamma Ray, AGN, Blazar

Following the report of a new Gamma-ray source by Rani et al. (ATel #17684)
possibly corresponding to the radio source TXS 0605+086, and the discovery
of an unreported variable star in the ATLAS archive at 3 arcsec distance
from the VLBI position of the radio source (ATel #17685), we made a spectrum
of the star with the 182 cm telescope of Cima Ekar, using a VPH grating
at resolution 470. The spectrum showed the normal absorption lines of a
G type star without emission lines, so it is unrelated to the Gamma-ray
source.

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Password Certification: Roberto Nesci (roberto.nesci@inaf.it)
https://www.astronomerstelegram.org/?read=17693
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