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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17440
Message-Id: <20251011070623.D5C3B2880698@server.astronomerstelegram.org>
Date: Sat, 11 Oct 2025 03:06:23 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17440							     ATEL #17440

Title:	Detection of a Highly Circularly Polarized Pulse at S-band
		from LPT J1634+44
Author:	Yunpeng Men (MPIfR), Ewan Barr (MPIfR), Gregory Desvignes
		(MPIfR), Ramesh Karuppusamy (MPIfR), Jason Wu (MPIfR)
Queries:	ypmen@mpifr-bonn.mpg.de
Posted:	10 Oct 2025; 16:03 UT
Subjects:Radio, Transient

We report on the detection of a highly circularly-polarized pulse from
LPT J1634+44 at S-band. The observation was conducted with the Ultra-Broad-Band
(UBB) receiver at Effelsberg on October 4, 2025. The time-of-arrival of
the pulse is UTC 2025-10-04 17:09:25.6, which is phase-aligned with the
timing solution reported in Dong et al. (2025, ApJ, 988, L29) and Bloot
et al. (2025, A&A, 699, A341).

The pulse exhibits nearly 100% circular polarization, consistent with previous
reports. The peak flux density of the pulse is estimated to be 0.3 Jy.
The UBB receiver covers the frequency range between 1.3 and 6 GHz, but
the pulse is detected only between 2.2 GHz and 3.0 GHz, as the other sub-bands
are contaminated by strong Radio Frequency Interferences. The corresponding
dynamic spectrum is shown in the link below.

A few days earlier, the CHIME/FRB and CHIME/Pulsar collaborations reported
renewed activity from LPT J1634+44 at 400–800 MHz and L-band (ATel #17434).
Combined with our observation, this confirms that the source is currently
active up to S-band.

Spectrum of a pulse from LPT J1634+44 detected at Effelsberg: https://doi.org/10.17617/3.REGUVO
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