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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17923, 17924, 17925
Message-Id: <20260725070756.4A0752880906@server.astronomerstelegram.org>
Date: Sat, 25 Jul 2026 03:07:56 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17923							     ATEL #17923

Title:	MAXI/GSC detection of a onset of the X-ray outburst from the
		Be/X-ray binary pulsar XTE J1858+034
Author:	Y. Kawakubo (AGU), M. Nakajima, H. Negoro, K. Saito, T. Yokoyama,
		M. Wada (Nihon U.), T. Mihara, T. Tamagawa, N. Kawai, M. Matsuoka
		(RIKEN), T. Sakamoto, M. Serino, S. Sugita, H. Hiramatsu, A. Yoshida
		(AGU), Y. Tsuboi, Y. Ishihara, H. Ogaki (Chuo U.), M. Shidatsu, C.
		Kang, M. Uenishi, T. Usuki, S. Yatsuzuka, H. Aoe (Ehime U.), I. Takahashi,
		Y. Yatsu (Science Tokyo), S. Nakahira, S. Ueno, H. Tomida, M. Kurihara
		(JAXA), Y. Ueda, K. Fujiwara, S. Kobayashi (Kyoto U.), M. Yamauchi,
		M. Nishio, C. Hiraizumi (Miyazaki U.), K. Yamaoka (Nagoya U.), M.
		Sugizaki (Kanazawa U.), W. Iwakiri (Chiba U.), T. Kawamuro (Osaka
		U.), S. Yamada (Tohoku U), S. Ogawa (TUS)
Queries:	nakajima.motoki@nihon-u.ac.jp
Posted:	24 Jul 2026; 09:17 UT
Subjects:X-ray, Binary, Neutron Star, Transient, Pulsar

The MAXI/GSC nova alert system triggered on an X-ray brightening from the
Be/X-ray binary pulsar XTE J1858+034 on 2026 July 23.  The latest X-ray
flux in 4-10 keV band, averaged over 12 scan transits between 21:22 UT
on July 22 (MJD 61243) and 19:03 UT on July 23 (MJD 61244), was 29 &plusmn;
4 mCrab.  This exceeds the peak flux of its previous X-ray activity in
2025 (&sim;19 mCrab; ATel #17260), suggesting that the current event may
develop into a major outburst.  Multi-wavelength follow-up observations
are encouraged.

the MAXI alert information: https://maxi.riken.jp/alert/novae/1244624474/1244624474.htm
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Password Certification: Motoki Nakajima (nakajima.motoki@nihon-u.ac.jp)
https://www.astronomerstelegram.org/?read=17923
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ATEL #17924							     ATEL #17924

Title:	Fermi-LAT detection of renewed gamma-ray activity from the
		FSRQ 4C +10.45
Author:	Adithiya Dinesh (Universidad Complutense de Madrid), on behalf
		of the Fermi Large Area Telescope Collaboration
Queries:	adinesh@ucm.es
Posted:	24 Jul 2026; 18:25 UT
Subjects:Gamma Ray, >GeV, AGN, Blazar

The Large Area Telescope (LAT), one of the two instruments on the Fermi
Gamma-ray Space Telescope, has observed renewed gamma-ray activity from
a source positionally consistent with the flat-spectrum radio quasar 4C
+10.45, also known as 4FGL J1608.7+1029 (Abdollahi et al. 2022, ApJS, 260,
53), with coordinates R.A. = 242.19251 deg, Decl. = +10.48549 deg (J2000;
Le Bail et al. 2016, AJ, 151, 79L), and redshift z=1.233 (SDSS-DR13, Albareti
et al. 2017, ApJS, 233, 25).

Preliminary analysis indicates that this source was in an elevated gamma-ray
emission state on July 23, 2026, with a daily averaged gamma-ray flux (E>100MeV)
of (0.8 +/- 0.2) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only).
This corresponds to a flux increase of a factor of more than 20 relative
to the average flux reported in the fourth data release of the Fourth Fermi-LAT
catalog (4FGL-DR4, Ballet et al. 2024, arXiv:2307.12546). The corresponding
photon index is 2.4 +/- 0.2, and is consistent with the 4FGL-DR4 value
of 2.53 +/- 0.03 within the uncertainties. The Fermi-LAT Collaboration
has previously reported a flare of this source in ATels #16889 and #17206.
Enhanced optical activity from the source was also reported in ATel #17916
on July 21, 2026.

Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray
monitoring of this source will continue. A preliminary light curve for
4C +10.45 can be accessed via the <a href="https://fermi.gsfc.nasa.gov/ssc/data/access/lat/LightCurveRepository/source.html?source_name=4FGL_J1608.7+1029">Fermi-LAT
Light-Curve Repository</a> and via the <a href="https://fermi.gsfc.nasa.gov/ssc/data/access/lat/msl_lc/source/4C_p10d45">Monitored
Source List</a>. We encourage multifrequency observations of this source.
For this source, the Fermi-LAT contact person is Adithiya Dinesh (adinesh@ucm.es).

The Fermi-LAT is a pair conversion telescope designed to cover the energy
band from 20 MeV to greater than 300 GeV. It is the product of an international
collaboration between NASA and DOE in the U.S. and many scientific institutions
across France, Italy, Japan and Sweden.

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Password Certification: Adithiya Dinesh (adinesh@ucm.es)
https://www.astronomerstelegram.org/?read=17924
==============================================================================
ATEL #17925							     ATEL #17925

Title:	Spectroscopic Classifications of Optical Transients with the
		Lick Shane telescope
Author:	Kishore C. Patra, Ryan J. Foley (UCSC)
Queries:	kcpatra@ucsc.edu
Posted:	25 Jul 2026; 04:43 UT
Subjects:Optical, Supernovae, Transient

We report the following classifications of optical transients from spectroscopic
observations with the Kast spectrograph on the Shane telescope. The targets
were supplied by GOTO and the Zwicky Transient Facility (ZTF). Observations
were made on 2026 July 24 UT. Classifications were performed with SNID
(Blondin & Tonry, 2007, ApJ, 666, 1024).

Name		    | IAU Name  | RA (J2000)	| Dec (J2000)	|   z   | Type    | Phase
| Notes 
GOTO26grc  	    | AT2026tnd	| 16:25:24.91  	| +38:48:20.65	| 0.03 	| SN
II   | 1 d    |  
GOTO26gpl  	    | AT2026rvq	| 21:36:04.92  	| +10:00:02.32	| 0.077 | SN
Ia   | 15 d   |  
ZTF26abfftwf        | AT2026rwn | 22:11:52.17	| +00:06:31.13  | 0.03 	|
SN II   | 9 d    |  
GOTO26hax           | AT2026ves | 21:06:22.01 	| -00:46:19.94	| 0.049 |
SN II   | -4 d   | (1) 
ZTF26abenjab        | AT2026reb | 00:09:57.58	| +00:05:59.70  | 0.055 |
SN IIn  |   	   | (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 the H-alpha P-Cygni minimum of -13,400 km/s.  
(2) We measure H-alpha FWHM of 2100 km/s.

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Password Certification: Kishore Patra (kcpatra@ucsc.edu)
https://www.astronomerstelegram.org/?read=17925
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