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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel 17383, 17384
Message-Id: <20250911071149.782DE2880908@server.astronomerstelegram.org>
Date: Thu, 11 Sep 2025 03:11:49 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17383							     ATEL #17383

Title:	Correction to ATel #17382
Author:	T. Liu (NAOC), Z. Pan (NAOC), D. A. Smith (CNRS and U. Bordeaux),
		X. Hou (YNAO), L. Qian (NAOC), R. B. Ding (BNU), S. Cao (BNU), and
		P. Jiang (NAOC)
Queries:	tongliu@bao.ac.cn
Posted:	10 Sep 2025; 14:19 UT
Subjects:Radio, Gamma Ray, Pulsar

Reference: <a href="https://www.astronomerstelegram.org/?read=17382">ATel
#17382</a>

The previously reported parameters in <a href="https://www.astronomerstelegram.org/?read=17382">ATel
#17382 are updated below with their measurement uncertainties.

For PSR J0237+5238 (associated with 4FGL J0237.8+5238):

- Spin period: 4.35295(2) ms

- Dispersion measure: 10.30(4) pc cm-3

- Orbital period: 15.87090(3) days

- Projected semi-major axis: 18.0609(4) light seconds

For PSR J0534+5945 (associated with 4FGL J0533.6+5945):

- Spin period: 191.496315(1) ms

- Dispersion measure: 18.75(8) pc cm-3

- Period derivative: 2.0(4) &times; 10-15 s/s

These corrections do not affect the scientific conclusions of the original
telegram.

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Password Certification: Shuo Cao (caoshuo@bnu.edu.cn)
https://www.astronomerstelegram.org/?read=17383
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ATEL #17384							     ATEL #17384

Title:	The FAST Discovery of Three Radio Pulsars Coincident with Fermi-LAT
		Gamma-ray Sources
Author:	Jianhua Fang(ZL), Pei Wang(NAOC), Dengke Zhou(ZL), Huaxi Chen(ZL),
		Yi Feng(ZL), Kuang Mao(ZL), Qi Wang(ZL), Zhaorong Tang(ZL), Qiuhong
		Pan(ZL), Dantong Jin(ZL), Di Li(THU/NAOC)
Queries:	wangpei@nao.cas.cn
Posted:	11 Sep 2025; 06:52 UT
Subjects:Radio, Gamma Ray, Neutron Star, Pulsar

We report the FAST (Five-hundred-meter Aperture Spherical radio Telescope,
[1]) discovery of three new radio pulsars coincident with previously unassociated
Fermi-LAT gamma-ray sources from the Fourth Fermi-LAT catalog (4FGL, [2][3]).

The pulsar PSR J1904-0708, associated with 4FGL J1904.7-0708, was first
detected in FAST data taken on 23 March 2025. It was detected in this single
epoch with a dispersion measure (DM) of 87.15 pc cm-3 and a
spin period of P=2.06 ms. Archival Swift-XRT observations of the region
revealed an X-ray counterpart with a count rate of (1.0 &plusmn; 0.2) &times;
10-2 counts/s, based on 34 photons. Previous analysis combining
Fermi gamma-ray data and machine learning identified this source as a high-probability
pulsar candidate [4].

The pulsar PSR J1730-0359, associated with 4FGL J1730.4-0359, was first
detected in FAST observations on 28 March 2025. It was observed in this
single epoch with a dispersion measure of 22.45 pc cm-3 and
a spin period of P = 5.09 ms.

The pulsar PSR J1827+1141, associated with 4FGL J1827.5+1141, was first
detected in FAST observations on 31 March 2025. It was detected in this
single epoch with a dispersion measure of 45.10 pc cm-3 and
a spin period of P = 2.66 ms. This source had previously been identified
by the MeerKAT TRAPUM survey as a high-confidence gamma-ray pulsar candidate
(random forest probability 0.96), with imaging sensitivity in the range
of 59-111 &mu;Jy [5].

We have proposed further FAST observations to conduct phase-connected timing
and to better constrain the rotational and emission properties of these
pulsars. We also encourage more target observations with multi-band facilities.

References: 
[1] Nan et al. 2011, IJMPD, 20, 989, doi:10.1142/S0218271811019335arXiv:
1105.3794 
[2] Ballet et al. 2023, arXiv:2307.12546 
[3]Smith et al. 2023, ApJ, 958, 191, doi:10.3847/1538-4357/acee67, arXiv:
2307.11132 
[4] Kaur et al. 2019, ApJ, 887, 18, doi:10.3847/1538-4357/ab4ceb

[5] Clark et al. 2023, MNRAS, 519, 5590, arXiv:2212.08528

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Password Certification: Pei Wang (wangpei@nao.cas.cn)
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