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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17835
Message-Id: <20260607070328.403D528807DB@server.astronomerstelegram.org>
Date: Sun,  7 Jun 2026 03:03:28 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17835							     ATEL #17835

Title:	FSRQ OQ 334: Upper limits from a neutrino search with IceCube
Author:	Yuhua Yao (University of Wisconsin–Madison), Justin Vandenbroucke
		(University of Wisconsin–Madison) for the IceCube Collaboration
Queries:	justin.vandenbroucke@wisc.edu
Posted:	6 Jun 2026; 21:42 UT
Subjects:Neutrinos, Blazar

The IceCube Collaboration (http://icecube.wisc.edu/) reports:

IceCube has performed a search for track-like muon neutrino events arriving
from the direction of the flat-spectrum radio quasar (FSRQ) OQ 334 (B2
1420+326). This FSRQ was recently found to be flaring brightly in the radio
(ATel # 17745), NIR (ATel #17792), optical (ATel #17795, ATel #17782),
GeV (ATel #17790, ATel #17821), and >100 GeV (ATel #17802) electromagnetic
bands. We searched in a time range of 30 days (2026-05-05 00:00:00.00 UTC
to 2026-06-04 00:00:00.00 UTC), during which IceCube was collecting good
quality data.

For this search, we report a p-value of 0.155 with respect to an atmospheric
background-only hypothesis. We accordingly derive a time-integrated muon-neutrino
flux upper limit for this source of E^2 dN/dE = 6.6e-2 GeV cm^-2 at 90%
CL, under the assumption of an E^-2 power law. 90% of events IceCube would
detect from a source at this declination with an E^-2 spectrum are between
approximately 700 GeV and 500 TeV.

The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector
operating at the geographic South Pole, Antarctica. The IceCube realtime
alert point of contact can be reached at roc@icecube.wisc.edu.

[1] IceCube Collaboration, R. Abbasi et al., ApJ 910 4 (2021)

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