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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17927, 17928
Message-Id: <20260727070610.E603028806A7@server.astronomerstelegram.org>
Date: Mon, 27 Jul 2026 03:06:10 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17927							     ATEL #17927

Title:	FRB 20121102A: Upper limits from a neutrino search with IceCube
Author:	Yuhua Yao (University of Wisconsin-Madison), Anna Franckowiak
		(Ruhr-University Bochum)
Queries:	anna.franckowiak@desy.de
Posted:	26 Jul 2026; 07:45 UT
Subjects:Neutrinos, Fast Radio Burst

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 frequently repeating fast radio burst FRB 20121102A,
following the report of renewed activity by FAST (ATel #17921).  We analyzed
a time window of 3600 seconds (2026-07-17 23:42:59.04 UTC to 2026-07-18
00:42:59.04 UTC), during which IceCube was collecting good quality data.
This time window is centered on the 1800 second interval with a high burst
rate reported by FAST. 
The analysis is consistent with the atmospheric background only hypothesis,
with a p-value of 1.0. We accordingly derive a time-integrated muon-neutrino
flux upper limit for this source of E^2 dN/dE = 4.8e-2 GeV cm^-2 at 90%
confidence level, for 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 470 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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Password Certification: Anna Franckowiak (anna.franckowiak@desy.de)
https://www.astronomerstelegram.org/?read=17927
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ATEL #17928							     ATEL #17928

Title:	Fermi-LAT detection of enhanced gamma-ray activity from the
		BL Lac 4C +14.60
Author:	Adithiya Dinesh (Universidad Complutense de Madrid), on behalf
		of the Fermi Large Area Telescope Collaboration
Queries:	adinesh@ucm.es
Posted:	26 Jul 2026; 17:47 UT
Subjects:Gamma Ray, >GeV, AGN, Blazar

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 BL Lac 4C +14.60, also known
as 4FGL J1540.7+1449 (Abdollahi et al. 2022, ApJS, 260, 53), with coordinates
R.A. = 235.20622 deg, Dec. = +14.79608 deg (J2000; Charlot et al. 2020,
A&A, 644, A159, and redshift z=0.606 (SDSS-DR13, Albareti et al. 2017,
ApJS, 233, 25).

Preliminary analysis indicates that this source was in an elevated gamma-ray
emission state on July 25, 2026, with a daily averaged gamma-ray flux (E>100MeV)
of (0.8+/-0.2) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only).
This corresponds to a flux increase of a factor of 120 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 1.75+/-0.12, indicating a significantly harder spectrum than the
4FGL-DR4 value of 2.25+/-0.08.

Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray
monitoring of this source will continue. We encourage multifrequency observations
of this source. For this source, the Fermi-LAT contact person is Adithiya
Dinesh (adinesh@ucm.es).

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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Password Certification: Adithiya Dinesh (adinesh@ucm.es)
https://www.astronomerstelegram.org/?read=17928
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