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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17623
Message-Id: <20260123070603.A79D92880349@server.astronomerstelegram.org>
Date: Fri, 23 Jan 2026 02:06:03 -0500 (EST)

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Posted: Within the last 24 hours
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ATEL #17623							     ATEL #17623

Title:	Yet, another NIR Flare of the FSRQ S4 0954+658
Author:	L. Carrasco, L. Felix, A. Porras, G. Escobedo, E. Recillas
		(INAOE, Mexico)
Queries:	Carrasco@inaoep.mx
Posted:	22 Jan 2026; 18:17 UT
Subjects:Radio, Infra-Red, Gamma Ray, AGN, Blazar, Quasar

We report on a new NIR flare of the intermediate redshift FSRQ S4 0954+658
(z=0.368), also known as CGRaBSJ0958+6533 associated with the gamma-ray
source 2FGL0958.6+6533. Our most recent NIR photometry for this source
shows that on January 20th,2026 (JD2461060.9072), the object brightness
corresponded to J = 13.212 +/- 0.05, H = 12.365 +/- 0.02 and Ks = 11.489
+/- 0.05. The NIR fluxes in the JHK bands had an important increase since
our previously observed flux was H = 13.932 +/- 0.05, on JD2460844.644618.
Hence, the object has increased its luminosity by a factor of about 4 in
this lapse. The object has shown flaring activity in different wavelength
bands in the past. (see ATel #3220, #6709, #6996, #7001, #7007, #7046,
#7093, #7750, #8445). Our observations are carried out with the 2.1m telescope
of the Guillermo Haro Observatory operated by the National Institute for
Astrophysics, Optics and Electronics (Mexico), equipped with the instrument
CANICA a NIR camera. We strongly encourage further multiwavelength coverage.

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