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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17346
Message-Id: <20250821070614.34A0A28808CC@server.astronomerstelegram.org>
Date: Thu, 21 Aug 2025 03:06:14 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17346							     ATEL #17346

Title:	Detection of very-high-energy gamma-ray emission from the FSRQ
		PKS 1725+123 with H.E.S.S.
Author:	Stefan Wagner for the H. E.S. S. collaboration
Queries:	contact.hess@hess-experiment.eu&#39;
Posted:	20 Aug 2025; 15:06 UT
Subjects:>GeV, TeV, VHE, AGN

The flat-spectrum radio quasar PKS 1725+123 (J2000: R.A. 17h28m07s, DEC
+12d15m39s; redshift 0.586) has been reported as active in the high-energy
gamma-ray and infrared bands throughout the year (ATels #17094, #17127,
#17316). Following an alert of the Fermi-LAT data monitoring pipeline FlaapLUC
(Lenain, 2018, A&C, 22, 9), the High Energy Stereoscopic System (H.E.S.S.)
observed this source in the night 19-20 August (JD 2460907) for almost
3h. The preliminary onsite analysis results in a significance of more than
6 sigma. This confirms the discovery at very-high energies by MAGIC and
LST-1 (ATel #17344), and is the first time H.E.S.S. has detected the source.

As PKS 1725+123 also flares in the optical domain (ATel #17345), multiwavelength
observations are strongly encouraged. H.E.S.S. plans to continue observation
in the upcoming nights.

H.E.S.S. is an array of five imaging atmospheric Cherenkov telescopes to
study very-high-energy gamma-ray sources above an energy of 50 GeV. H.E.S.S.
is located in the Khomas Highlands in Namibia. It was constructed and is
operated by researchers from Armenia, Australia, Austria, Denmark, France,
Germany, Ireland, Japan, the Netherlands, Poland, South Africa, UK, and
the host country, Namibia.

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