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From: atel@astronomerstelegram.org
Subject: ATel  17938
Message-Id: <20260804070319.6F0932880339@server.astronomerstelegram.org>
Date: Tue,  4 Aug 2026 03:03:19 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17938							     ATEL #17938

Title:	LHAASO detection of VHE gamma-ray emission from the extreme
		HBL 1ES 1028+511
Author:	Guangman Xiang (IHEP), Min Zha (IHEP), Zhiguo Yao (IHEP),
		Jianeng Zhou (SHAO) and Yi Xing (SHAO) report on behalf of the LHAASO
		Collaboration
Queries:	gmxiang@ihep.ac.cn
Posted:	3 Aug 2026; 15:16 UT
Subjects:Gamma Ray, TeV, VHE, AGN, Blazar, Transient

We report the detection of a gamma-ray signal from the direction of the
extreme high-synchrotron-peaked BL Lac object (EHBL) 1ES 1028+511 (RA =
10h31m18.5s, Dec = +50d53m36.0s) at a redshift of z = 0.361 (Polomski et
al. 1997, ApJ, 486, 179). Using the LHAASO-WCDA real-time alert system,
the signal was detected during the time window MJD 61251.31-61251.48 with
a false alarm rate of < 0.3 events/year. A preliminary analysis indicates
an observed flux of ~0.06 Crab units above 1 TeV.

1ES 1028+511 is a known VHE emitter previously detected by VERITAS and
Fermi-LAT. Given the low false alarm rate, we encourage multi-wavelength
follow-up observations on this source.

LHAASO is a multi-purpose Extensive Air Shower (EAS) array designed to
detect air showers induced by gamma rays and cosmic rays from sub-TeV energies
to above 1 PeV.

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