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From: atel@astronomerstelegram.org
Subject: ATel  17325
Message-Id: <20250809070636.85B73288085B@server.astronomerstelegram.org>
Date: Sat,  9 Aug 2025 03:06:36 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17325							     ATEL #17325

Title:	Fermi-LAT detection of enhanced gamma-ray activity from the
		FSRQ B2 1324+22
Author:	G. La Mura (INAF - Astronomical Observatory of Cagliari),
		on behalf of the Fermi Large Area Telescope Collaboration
Queries:	giovanni.lamura@inaf.it
Posted:	8 Aug 2025; 19:35 UT
Subjects:Gamma Ray, >GeV, AGN, Blazar, Quasar

The Large Area Telescope (LAT), one of the two instruments on the Fermi
Gamma-ray Space Telescope, has observed enhanced gamma-ray activity from
a source positionally consistent with the flat-spectrum radio quasar B2
1324+22, also known as 4FGL J1326.9+2210 (Abdollahi et al. 2022, ApJS,
260, 53), with coordinates R.A. = 201.75359 deg, Dec. = +22.18060 deg (J2000;
Truebenbach et al. 2017, ApJS, 233, 3), and redshift z = 1.398 (Albareti
et al. 2017, ApJS, 233, 25).

Preliminary analysis indicates that this source was in an elevated gamma-ray
emission state on August 7, 2025, with a daily averaged gamma-ray flux
(E>100MeV) of (0.5+/-0.1) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty
only). This corresponds to a flux increase of a factor of 20 relative to
the average flux reported in the fourth data release of the fourth Fermi-LAT
catalog (4FGL-DR4, Ballet et al. 2023, arXiv:2307.12546). This is the highest
LAT daily flux ever observed for this source. The corresponding photon
index is 2.2+/-0.2, indicating a harder spectrum than the 4FGL-DR4 value
of 2.48 +/- 0.03.

Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray
monitoring of this source will continue. A preliminary light curve for
B2 1324+22 can be accessed via the Fermi-LAT Light-Curve Repository at
<a href="https://fermi.gsfc.nasa.gov/ssc/data/access/lat/LightCurveRepository/source.html?source_name=4FGL_J1326.9+2210">4FGL
J1326.9+2210</a>.  We encourage multifrequency observations of this source.
For this source, the Fermi-LAT contact person is Giovanni La Mura (giovanni.lamura@inaf.it).

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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