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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17590, 17591
Message-Id: <20260112071229.B413E28803D6@server.astronomerstelegram.org>
Date: Mon, 12 Jan 2026 02:12:29 -0500 (EST)

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Posted: Within the last 24 hours
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ATEL #17590							     ATEL #17590

Title:	Independent Discovery of a Probable Nova in M31, AT 2026gs
Author:	R. Fidrich, T. Tordai (HAA/VSS), K. Hornoch, H. Kucakova (Ondrejov),
		A. W. Shafter (SDSU)
Queries:	ashafter@sdsu.edu
Posted:	11 Jan 2026; 07:06 UT
Subjects:Optical, Nova, Transient

We report the independent discovery of the probable nova AT 2026gs (= Vend81)
found with the 0.43m CDK reflector of the Alnitak Remote Observatory (ARO)
on 2026 Jan. 08.820UT. The object was confirmed with follow-up observations
using the Utah Desert Remote Observatory (UDRO), as well as with observations
taken with the 0.65-m telescope at Ondrejov (OND). The resulting photometry
of the nova candidate, designated by us as M31N 2026-01a, is summarized
in the table below.

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

2026-01-08.820 |  18.4  | 0.1  | Luminance | ARO 
2026-01-09.193 |  17.8  | 0.1  | Luminance | UDRO 
2026-01-10.779 |  17.3  | 0.1  |    R      | OND 
2026-01-10.797 |  17.2  | 0.1  |    R      | OND

</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.

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Password Certification: Allen W. Shafter (ashafter@sdsu.edu)
https://www.astronomerstelegram.org/?read=17590
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ATEL #17591							     ATEL #17591

Title:	FAST detected repeated bursts from FRB 20251229A
Author:	Dejiang Zhou (NAOC), Jiarui Niu (NAOC),  Wanjin Lu (NAOC),
		Shiqian Zhao (GZHU), Jintao Xie (SUSE), Dengke Zhou (Zhejiang Lab),
		Heng Xu (NAOC), Suo Cao (NAOC), Longxuan Zhang (HUST), Yuhao Zhu (NAOC),
		Jiaheng Zhang (CCNU), Yuanpei Yang (YNU), Dongzi Li (THU), WeiWei
		Zhu (NAOC),  Bing Zhang (HKU),  Jinlin Han (NAOC), Jinhuang Cao (NAOC),
		Yi Feng (Zhejiang Lab), Yuxiang Huang (YNAO), Di Li (THU), Rui Luo
		(GZHU),  Fayin Wang (NJU),  Pei Wang (NAOC),  Xuan Yang (PMO), Ye
		Li (PMO), Wenfei Yu (SHAO), Songbo Zhang (PMO)
Queries:	zhuww@nao.cas.cn
Posted:	11 Jan 2026; 10:19 UT
Subjects:Radio, Fast Radio Burst

We carried out follow-up observations of the recently discovered repeating
fast radio burst  FRB 20251229A (ATel#17574) for 40 minutes on 2026 January
6, 2 hours on 2026 January 7, and 30 minutes each on 2026 January 8 and
9, using the Five-hundred-meter Aperture Spherical radio Telescope (FAST,
Nan et al. 2011) with the 19-beam receiver covering a frequency bandwidth
from 1.0 GHZ to 1.5 GHz  (Jiang et al. 2020). Polarization Data were recorded
for 4.7 hours in total with a 49.152 \mu s sampling time, and we detected
9 bursts, as listed below:

DATE       |        TOA      | S/N   |Width(ms)| Fluence (mJy ms)

2026-01-06 | 61046.355822639 | 28.6  | 3.8     | 1018.4

2026-01-06 | 61046.355822871 | 54.7  | 3.3     | 1933.3

2026-01-06 | 61046.361141021 | 57.7  | 4.4     | 299.8

2026-01-06 | 61046.361315179 | 20.2  | 8.1     | 183.3

2026-01-06 | 61046.374163996 | 14.7  | 3.2     | 136.9

2026-01-07 | 61047.298726257 | 10.6  | 7.1     |  47.4

2026-01-07 | 61047.305362873 | 272.8 | 2.1     |1997.3

2026-01-08 | 61048.252010508 | 12.3  | 5.3     |  39.4

2026-01-09 | 61049.317006043 | 15.1  | 7.0     | 111.1

We applied the structure-maximizing techniques (Hessels et al. 2019) to
the highest S/N burst detected on 2026-01-07, and obtained a consistent
but more accurate dispersion measure of DM = 192.91 +/- 0.15 pc cm^{-3}
than that given by the HyperFlash and ECLAT (ATel#17588). The time of arrival
(TOA) has been converted to the infinite frequency using this DM value.
Signal-to-noise ratios (S/N) and fluences were measured following standard
FAST single-pulse analysis procedures (Zhou et al. 2023). The rotation
measure is also derived from polarization data of this brightest burst:
RM = -77.7 +/- 1.8 rad m^{-2}.

References:

Hessels, J.~W.~T., Spitler, L.~G., Seymour, A.~D., et al.\ 2019, ApJL,
876, 2, L23.

Jiang, P., Tang, N.-Y., Hou, L.-G., et al.\ 2020, RAA, 20, 5, 064.

Nan, R., Li, D., Jin, C., et al. 2011, INT J MOD PHYS D, 20, 6, 989.

Zhou, D.J., Han, J.L., Xu, J., et al. 2023, RAA,23, 104001

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