文件操作 - 1749452784.M642428P18276.mail.planetcloud-host.com,S=5113,W=5197:2,

文件: /var/vmail/bicar.it/stefano/cur/1749452784.M642428P18276.mail.planetcloud-host.com,S=5113,W=5197:2,

编辑文件内容

Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=174.142.199.243; helo=server.astronomerstelegram.org; envelope-from=atel@astronomerstelegram.org; receiver=stefano@bicar.it 
To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17226
Message-Id: <20250609070620.EF9B02880847@server.astronomerstelegram.org>
Date: Mon,  9 Jun 2025 03:06:20 -0400 (EDT)

------------------------------------------------------------------------------ 
The Astronomer's Telegram is free to read, free to publish, free to
use.  Thanks to the support of our patrons, we can continue to
keep it free. https://www.patreon.com/astronomerstel
------------------------------------------------------------------------------ 
The Astronomer's Telegram                   http://www.astronomerstelegram.org 
------------------------------------------------------------------------------
Posted: Within the last 24 hours
==============================================================================
ATEL #17226							     ATEL #17226

Title:	Fermi-LAT detection of renewed gamma-ray activity from the
		FSRQ Ton 599 (4C +29.45)
Author:	S. Wagner (University of Wuerzburg) and Pietro Monti-Guarnieri
		(University of Trieste and INFN Trieste) on behalf of the Fermi Large
		Area Telescope Collaboration
Queries:	sarah.wagner@physik.uni-wuerzburg.de
Posted:	8 Jun 2025; 19:59 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 renewed gamma-ray activity from
a source positionally consistent with the flat-spectrum radio quasar Ton
599, also known as 4FGL J1159.5+2914 (Abdollahi et al. 2022, ApJS, 260,
53), with coordinates RA = 179.88264 deg, Decl. = 29.24551 deg, (J2000;
Johnston et al. 1995 AJ 110, 880) at z = 0.72449 (Adelman-McCarthy et al.
2008, ApJS, 175, 297).

Preliminary analysis indicates that this source was in an elevated gamma-ray
emission state on June 7, 2025 , with a daily averaged gamma-ray flux (E>100MeV)
of (1.8 +/- 0.2) x 10^-6 photons cm^-2 s^-1 (statistical uncertainty only).
This corresponds to a flux increase of a factor of 10 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). The corresponding photon
index is 2.2 +/- 0.1, and is consistent with the 4FGL-DR4 value of 2.155
+/- 0.006 within the uncertainties. Gamma-ray flaring of Ton 599 has previously
been reported in ATels #15859, #14897, #14722, #10931, #8319, and #2795.

Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray
monitoring of this source will continue. A preliminary light curve for
Ton 599 can be accessed via the <a href="https://fermi.gsfc.nasa.gov/ssc/data/access/lat/LightCurveRepository/source.html?source_name=4FGL_J1159.5+2914">Fermi-LAT
Light-Curve Repository</a> and the <a href="https://fermi.gsfc.nasa.gov/ssc/data/access/lat/msl_lc/source/Ton_599">Monitored
Source List</a>.  We encourage multifrequency observations of this source.
For this source, the Fermi-LAT contact persons are S. Ciprini (stefano.ciprini@ssdc.asi.it)
and D. J. Thompson (David.J.Thompson@nasa.gov).

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.

------------------------------------------------------------------------------
Password Certification: Sarah Wagner (sarah.wagner@physik.uni-wuerzburg.de)
https://www.astronomerstelegram.org/?read=17226
==============================================================================

==============================================================================
This is an automatically-generated notice.  You can remove yourself permanently
from receiving both the Daily Email Digest and Instant Email Notices from
The Astronomer's Telegram by following this link:
https://www.astronomerstelegram.org?unsubscribe&confirmation=a803d34e7ea924f9a4142bac00763549&address=stefano@bicar.it

文件操作 - 1749452784.M642428P18276.mail.planetcloud-host.com,S=5113,W=5197:2,

文件: /var/vmail/bicar.it/stefano/cur/1749452784.M642428P18276.mail.planetcloud-host.com,S=5113,W=5197:2,

编辑文件内容

修改文件时间

删除文件