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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17827
Message-Id: <20260603070323.E0E112880843@server.astronomerstelegram.org>
Date: Wed,  3 Jun 2026 03:03:23 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17827							     ATEL #17827

Title:	A fast recent NIR flare of the Blazar CGRaBSJ1257+3229
Author:	L. Carrasco, A. Porras ,G. Escobedo, E. Recillas, L. Felix
		(INAOE, Mexico)
Queries:	Carrasco@inaoep.mx
Posted:	2 Jun 2026; 16:06 UT
Subjects:Radio, Infra-Red, Optical, Gamma Ray, AGN, Black Hole, Blazar,
		Quasar

We report on a recent fast NIR flare of the Blazar CGRaBSJ1257+3229, also
known as QSO B1255+32 cross correlated with the gamma-ray source 2FGLJ1258.2+3231.
On May24th, 2026 (JD2461184.8315), we found the object undergoing a large
outburst. The NIR fluxes in the JHK bands were then: J=14.70 +/- 0.03,
H=13.67 +/-  0.05 and Ks=13.07 +/- 0.05. While two days later, on JD2461186.7190
the H-band flux had decreased to H = 14.55 +/- 0.05, a factor of 2.2. This
fact implies that the emitting zone is rather small less than two light
days. Previously, the NIR fluxes in the H band on JD2461139.9695 and JD2460841.7855
had been H=15.180 +/- 0.055 and H=16.536 +/- 0.030, respectively. Hence,
the object underwent an increase in the H band by a factor of 4 during
the first lapse of forty five days and a factor of 14 during the last year.
Ten years ago, the object showed a giant NIR flare reported on ATel#9084.
Our observations are carried out with CANICA a NIR camera on the 2.1m telescope
at the Observatorio Astrofisico Guillermo Haro, operated by the National
Institute for Astrophysics, Optics and Electronics (INAOE, Mexico). We
encourage further multiwavelength observations.

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