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From: atel@astronomerstelegram.org
Subject: ATel  17448, 17449
Message-Id: <20251021071053.4F42328804C1@server.astronomerstelegram.org>
Date: Tue, 21 Oct 2025 03:10:53 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17448							     ATEL #17448

Title:	Fermi-LAT detection of renewed gamma-ray activity from the
		FSRQ PKS 0405-385
Author:	Adithiya Dinesh (Universidad Complutense de Madrid),  P. Monti-Guarnieri
		(University of Trieste and INFN Trieste),  and  Giovanni La Mura (INAF
		- Astronomical Observatory of Cagliari), on behalf of the Fermi Large
		Area Telescope Collaboration
Queries:	adinesh@ucm.es
Posted:	20 Oct 2025; 19:33 UT
Subjects:Gamma Ray, >GeV, Request for Observations, AGN

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  PKS
0405-385, also known as 4FGL J0407.0-3826 (Abdollahi et al. 2022, ApJS,
260, 53), with coordinates R.A. = 61.74598 deg, Dec. = -38.44112 deg (J2000;
Fey et al., 2004, AJ, 127, 3587), and redshift z=1.285 (Veron et al., 1990,
A&AS, 86, 543).

Preliminary analysis indicates that this source was in an elevated gamma-ray
emission state on October 19, 2025, with a daily averaged gamma-ray flux
(E>100MeV) of (0.7+/-0.1) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty
only). This corresponds to a flux increase of about a factor of 20 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 2.1+/-0.1,  indicating a slightly harder spectrum than
the 4FGL-DR4 value of  2.38 +/- 0.02. The Fermi LAT Collaboration has previously
reported flaring activity from this source in ATel #16183.

Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray
monitoring of this source will continue.  A preliminary light curve for
PKS 0405-385 can be accessed via the Fermi-LAT Light-Curve Repository at
<a href="https://fermi.gsfc.nasa.gov/ssc/data/access/lat/LightCurveRepository/source.html?source_name=4FGL_J0407.0-3826">https://fermi.gsfc.nasa.gov/ssc/data/access/lat/LightCurveRepository/source.html?source_name=4FGL_J0407.0-3826</a>.
We encourage multifrequency observations of this source. For this source,
the Fermi-LAT contact person is Denis Bernard (denis.bernard@in2p3.fr).

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=17448
==============================================================================
ATEL #17449							     ATEL #17449

Title:	Spectroscopic Classification of AT2025znv with the Lick Shane
		Telescope
Author:	K. Taggart, R. J. Foley (UCSC)
Queries:	k.taggart@ucsc.edu
Posted:	21 Oct 2025; 05:45 UT
Subjects:Optical, Supernovae

We report the following classification of AT2025znv from spectroscopic
observations with the Kast spectrograph on the Shane telescope. The target
was supplied by the Young Supernova Experiment and identified using the
target management platform YSE-PZ (Coulter et al., 2023, PASP, 135, 4501).
All observations were made on 2025 Oct 20  UT. Classifications were performed
with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

Name    | IAU Name | RA (J2000)  | Dec (J2000)  |   z    | Type | Phase
| Notes 
PS25hsk | 2025znv  | 07:31:59.58 | +42:33:44.95 | 0.0446 |  II  | post-peak
|  1)

Notes: 
When the redshift is given to 2 decimal places, it is derived from the
SN spectrum. Otherwise, the redshift is determined from the host galaxy.

1) We measure a narrow H-alpha component (FWHM ~400 km/s), likely from
the host galaxy, superposed on a broad component (FWHM ~15,900 km/s) that
has an absorption minimum at approximately 9,000 km/s

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Password Certification: Kirsty Taggart (k.taggart@ucsc.edu)
https://www.astronomerstelegram.org/?read=17449
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