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From: atel@astronomerstelegram.org
Subject: ATel  17615, 17616, 17617
Message-Id: <20260121071752.BCF6628808CB@server.astronomerstelegram.org>
Date: Wed, 21 Jan 2026 02:17:52 -0500 (EST)

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ATEL #17615							     ATEL #17615

Title:	1A 1118-616 exhibits strong evidence for a 17.0 year period
Author:	M. J. Coe (Southampton University, UK)
Queries:	mjcoe@soton.ac.uk
Posted:	20 Jan 2026; 14:44 UT
Subjects:Binary, Neutron Star, Transient

The Be/X-ray system 1A 1118-616 is currently undergoing a rare major outburst
(Nakajima et al ATel #17613). From its initial discovery it is known to
exhibit a 404s pulse period, but the binary period is less clear. Staubert
et al (2011) proposed that this period could be 24.0d based upon a detailed
study of the outburst that occurred in January 2009. However, this latest
X-ray outburst is the 4th one detected and a strong alternative binary
period is now emerging.

The first outburst peaked on JD2442406 (Eyles et al 1975), the second on
JD2448620 (Coe et al 1994), the third peaked on JD 2454844 (Mangano 2009)
and the 4th is predicted to peak on JD2461062 (Nakajima 2026). The intervals
between each of these outbursts is almost exactly 17.0 years.

Though neither 24.0d nor 17.0y fit comfortably on the Corbet Diagram with
a 404s pulse period, the latest outburst suggests strongly that there is
a fundamental period of 17.0 years involved in the behaviour of this system.
It must be either the true binary period, or perhaps evidence for a triple
system.

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Password Certification: Malcolm Coe (mjcoe@soton.ac.uk)
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ATEL #17616							     ATEL #17616

Title:	SRG/ART-XC TOO observation of the binary X-ray pulsar 1A 1118-61
Author:	S. Molkov, A. Lutovinov, A. Tkachenko, I. Mereminskiy, I.
		Lapshov (IKI RAS, Moscow)
Queries:	molkov@cosmos.ru
Posted:	20 Jan 2026; 15:39 UT
Subjects:X-ray, Binary, Neutron Star, Transient, Pulsar

Title: SRG/ART-XC TOO observation of the binary X-ray pulsar 1A 1118-61

Author:	S. Molkov, A. Lutovinov, A. Tkachenko, I. Mereminskiy, I. Lapshov
(IKI RAS, Moscow)

The High-mass Be/X-ray binary system 1A1118-61 is a transient source 
which very rare demonstrate the Type-II outbursts, approximately once 
per 17 years. New outburst had been detected by the Swift/BAT telescope

on 2026 January 17 (GCN #43435; GCN #43442; ATel #17608) 
and later confirmed by MAXI/GSC (ATel #17613).

The Mikhail Pavlinsky ART-XC telescope on board the SRG observatory 
started a pointed observation of 1A1118-61 on 2026-01-19T13:01:00 (UTC+0).

Using the first 70 ks of the observation we clearly detected the source
with 
the mean fluxes around 2.5e-9, 2.2e-9 and 2.1e-9 erg/s/cm2 
(~160, 330 and 420 mCrab) in the 4-12, 12-20 and 20-30 keV energy 
bands, respectively. Nevertheless the flux is highly variable on the time

scale of few hundreds seconds. 
We also detected pulsations with the pulse period of 408.9(1) s and pulsed

fraction of 25 percent.

A careful spectral analysis is complicated by the increased and variable

background of charged particles caused by the powerful activity of 
the Sun and will be done later.

During the next 2 days ART-XC will continue observe 1A1118-61.

We encourage further multiwavelength observations of the source.

ART-XC is X-ray telescopes on board the SRG observatory which 
was launched from the Baikonur cosmodrome on 13 July 2019 by the Proton

rocket. ART-XC has been renamed 'Mikhail Pavlinsky ART-XC telescope' 
in honor of its first PI, Dr. Mikhail Pavlinsky.

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Password Certification: Sergei Molkov (molkov@hea.iki.rssi.ru)
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ATEL #17617							     ATEL #17617

Title:	Spectroscopic Classification of Astrophysical Transients with
		the Lick Shane Telescope
Author:	K. W. Davis, R. J. Foley (UCSC)
Queries:	kywdavis@ucsc.edu
Posted:	20 Jan 2026; 18:01 UT
Subjects:Optical, Supernovae

We report the classifications of astrophysical transients from spectroscopic
observations with the Kast spectrograph on the Shane telescope obtained
on 2026 January 18 UT. The targets were supplied by ZTF. Targets were identified
using the target management platform YSE-PZ (Coulter et al., 2023, PASP,
135, 4501). The classifications were performed with SNID (Blondin & Tonry,
2007, ApJ, 666, 1024).

Name         | IAU Name   | RA (J2000)   | Dec (J2000)  |   z   | Type
| Phase | Notes 
ZTF26aaadpbv | AT2026iu   | 15:57:58.517 | +02:48:10.90 | 0.048 | SN Ia
| +10d  | (1) 
ZTF26aaavvqo | AT2026abu  | 16:19:48.245 | +03:07:17.21 | 0.028 | SN IIb
| +10d  | (2)

Notes: 
When the redshift is given to 2 decimal places, it is derived from the
SN spectrum. Otherwise, the redshift is determined from the host galaxy.

(1) We measure a Si II 6355 absorption velocity of -10,300 km/s. 
(2) We Measure a H-alpha absorption velocity of -9,100 km/s.

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