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From: atel@astronomerstelegram.org
Subject: ATel  17509
Message-Id: <20251130070623.976D32880860@server.astronomerstelegram.org>
Date: Sun, 30 Nov 2025 02:06:23 -0500 (EST)

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ATEL #17509							     ATEL #17509

Title:	Fermi-LAT detection of renewed gamma-ray activity from the
		FSRQ PKS 0736+01
Author:	P. Monti-Guarnieri (University of Trieste and INFN Trieste),
		on behalf of the Fermi Large Area Telescope Collaboration
Queries:	pietro.monti-guarnieri@phd.units.it
Posted:	29 Nov 2025; 16:05 UT
Subjects:Gamma Ray, >GeV, Request for Observations, Blazar, Quasar

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 PKS
0736+01, also known as 4FGL J0739.2+0137 (The Fermi-LAT collaboration 2020,
ApJS, 247, 33), with coordinates R.A. = 114.82514 deg, Dec = 1.61795 deg
(J2000, Johnston et al. 1995, AJ, 110, 880), and redshift 0.18941 (Ho &
Kim, 2009, ApJS, 184, 398).

Preliminary analysis indicates that this source was in an elevated gamma-ray
emission state on November 28, 2025, with a daily averaged gamma-ray flux
(E>100MeV) of (2.3 +/- 0.3) 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 release of the fourth Fermi-LAT
catalog (4FGL-DR4, Ballet, J. et al. 2023, arXiv:2307.12546). The corresponding
photon index is 1.9 +/- 0.1, indicating a significantly harder spectrum
than the 4FGL-DR4 value of 2.39 +/- 0.01. The Fermi-LAT Collaboration has
previously reported flaring activity from this source in ATels #16179 and
#6731 and in GCNs <a href="https://gcn.gsfc.nasa.gov/other/1558190650_fermi.txt">1558190650</a>
and <a href="https://gcn.gsfc.nasa.gov/other/1558277046_fermi.txt">1558277046</a>.
The spectral hardening led to the detection of two high-energy (E>10GeV)
photons associated with the source at a confidence level p > 0.999. The
highest energy event was a 20 GeV photon observed at 04:29:42 UT.

Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray
monitoring of this source will continue. A preliminary light curve for
PKS 0736+01 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_J0739.2+0137">4FGL
J0739.2+0137</a>. A preliminary estimation of the daily gamma-ray flux
observed by Fermi-LAT is also publicly available on the LAT Monitored Source
page at <a href="https://fermi.gsfc.nasa.gov/ssc/data/access/lat/msl_lc/source/PKS_0736p01">PKS_0736+01</a>.
We encourage multifrequency observations of this source. For this source,
the Fermi-LAT contact person is Filippo D'Ammando (filippo.dammando@fisica.unipg.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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