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Date: Sat, 16 Aug 2025 03:13:44 -0400
Message-Id: <202508160713.57G7Di5X054181@server.astronomerstelegram.org>
To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17334, 17335

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Posted: Within the last 24 hours
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ATEL #17334							     ATEL #17334

Title:	Independent Discovery of a Probable Nova in M31
Author:	K. Hornoch (Ondrejov), H. Kucakova, K. Honkova (Charles University),
		A. W. Shafter (SDSU)
Queries:	k.hornoch@centrum.cz
Posted:	16 Aug 2025; 00:23 UT
Subjects:Optical, Nova, Transient

We report the independent discovery of a probable nova found during our
survey of the central region of M31. The object was discovered on a co-added
810-s R-band CCD frame taken on 2025 Aug. 14.813 UT with the 0.65-m telescope
at Ondrejov.

The object was independently discovered on Aug. 15.087 UT by R. Fidrich
and T. Tordai and designated as AT 2025twt.

The object was designated by us as PNV J00423625+4114431 = M31N 2025-08a
and is located at R.A. = 0h42m36s.25, Decl. = +41o14'43".1 (equinox 2000.0),
which is 91.0" west and 85.4" 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
at Ondrejov (D65):

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

2025-08-14.102 | >19.4  |      | R       | D65 
2025-08-14.813 |  18.8  | 0.25 | 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/M31N2025-08a.png
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Password Certification: Allen W. Shafter (ashafter@sdsu.edu)
https://www.astronomerstelegram.org/?read=17334
==============================================================================
ATEL #17335							     ATEL #17335

Title:	MAXI/GSC detection of an X-ray flare from the BY Dra type star
		HD 29697
Author:	W. Iwakiri (Chiba U.), H. Negoro, M. Nakajima, K. Takagi,
		H. Takahashi, H. Nishio (Nihon U.),  T. Mihara, T. Tamagawa, N. Kawai,
		M. Matsuoka (RIKEN),  T. Sakamoto, M. Serino, S. Sugita, Y. Kawakubo,
		H. Hiramatsu, Y. Kondo, A. Yoshida (AGU),  Y. Tsuboi, H. Sugai, N.
		Nagashima, Y. Ishihara (Chuo U.),  M. Shidatsu, Y. Niida, C. Kang,
		T. Nakamoto (Ehime U.), I. Takahashi, Y. Yatsu (Science Tokyo),  S.
		Nakahira, S. Ueno, H. Tomida, M. Ishikawa, S. Ogawa, 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.),
		T. Kawamuro (Osaka U.),  S. Yamada (Tohoku U), report on behalf of
		the MAXI team:
Queries:	iwakiri@chiba-u.jp
Posted:	16 Aug 2025; 00:36 UT
Subjects:X-ray, Star, Transient

The MAXI/GSC nova alert system triggered on an X-ray flare from the position
consistent with the BY Dra type star HD 29697 during a scan transit at
21:35 UT on Aug 15 2025.

The X-ray flux averaged over the scan was 74 +/- 19 mCrab 
(4.0-10.0keV, 1 sigma error).  Since the distance to the source is 13.2123
pc (GaiaCollaboration et al.2020), the observed X-ray flux corresponds
to a luminosity of about 3 x 10<sup>31</sup> erg/s.

There was no significant excess flux with an upper limit of 20 mCrab in
the next scan transit 23:08 UT.

This is the first time that MAXI has detected an X-ray flare from HD 29697
in 16 years of observation.

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https://www.astronomerstelegram.org/?read=17335
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