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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17685, 17686
Message-Id: <20260218071116.8993228806BE@server.astronomerstelegram.org>
Date: Wed, 18 Feb 2026 02:11:16 -0500 (EST)

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Posted: Within the last 24 hours
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ATEL #17685							     ATEL #17685

Title:	Optical counterpart of the Gamma-ray source Fermi J0607.8+0843
Author:	Roberto Nesci (INAF/IAPS)
Queries:	roberto.nesci@inaf.it
Posted:	17 Feb 2026; 11:23 UT
Subjects:Optical, Gamma Ray, AGN, Blazar

Following the report of a new Gamma ray source by Rani et al. (ATel #17684)
tentatively corresponding to the radio source TXS 0605+086, I made a forced
photometry search in the ATLAS archive since MJD 57318 for a source at
the VLBI coordinates 06:08:13.0 +08:40:25 (Petrov \& Kovalev 2025, ApJS,
276, 38). Within 1 arcsec from this position there is a fast and irregularly
variable point-like source with average magnitude o=15.7, rms deviation
0.4 mag and a rather blue (0.3 mag) c-o color.  
In the VSX catalog the nearest known variable star is at 1.8 arcmin from
the VLBI coordinates: it is a Delta Sct type star detected by Gaia, with
G magnitude 14.85 and 0.03 mag amplitude, which is clearly unrelated with
the Gamma ray source. 
Optical spectroscopic follow-up of this source is suggested to clarify
if it is actually an AGN.

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Password Certification: Roberto Nesci (roberto.nesci@inaf.it)
https://www.astronomerstelegram.org/?read=17685
==============================================================================
ATEL #17686							     ATEL #17686

Title:	ATLAS and ZTF optical observations of the X-ray transient AT2019wey
		during the recent X-ray rebrightening
Author:	Albert K. H. Kong (NTHU)
Queries:	akong@gapp.nthu.edu.tw
Posted:	17 Feb 2026; 14:35 UT
Subjects:Optical, X-ray, Binary, Black Hole, Transient

Following the recent report of the X-ray rebrightening of the Galactic
X-ray transient AT2019wey (ATel #17680), we searched for the ATLAS database
to investigate the optical variability. Using the ATLAS forced photometry
server  (https://fallingstar-data.com/forcedphot/), we extracted the long-term
optical light curve of AT2019wey. Based on the forced measurement on the
target images, the o-band magnitude of AT2019wey decreased from 17.1 mag
in 2025 March to 18.1 mag in 2025 late-December. Since then, AT2019wey
has gradually rebrigtened to a magnitude of 17.4 in early February. Furthermore,
we checked the ZTF database via the ALeRCE ZTF explorer, and the source
shows similar behaviour (https://alerce.online/object/ZTF19acwrvzk).

We also examined the MAXI X-ray light curve of AT2019wey. The source has
shown an X-ray softening trend with a clear brightening in the 2-4 keV
band since 2025 late-December. This is consistent with the SVOM/ECLAIRs
and optical observations.

Multi-wavelength follow-up observations are encouraged to monitor the source's
variability.

ATLAS lightcurve of AT2019wey: https://fallingstar-data.com/forcedphot/queue/3817639/plot.pdf
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Password Certification: Albert Kong (akong@phys.nthu.edu.tw)
https://www.astronomerstelegram.org/?read=17686
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