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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17310, 17311
Message-Id: <20250727071100.81804288097D@server.astronomerstelegram.org>
Date: Sun, 27 Jul 2025 03:11:00 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17310							     ATEL #17310

Title:	Rebrightness of FRB 20220529
Author:	Xuan Yang (PMO), Ye Li (PMO), Song-Bo Zhang (PMO), Jia-Rui
		Niu (NAOC), Yuan-Pei Yang (YNU), Wei-Wei Zhu (NAOC), Xue-Feng Wu (PMO)
Queries:	yangxuan@pmo.ac.cn
Posted:	26 Jul 2025; 09:05 UT
Subjects:Radio, Transient, Fast Radio Burst

We observed the repeating fast radio burst FRB 20220529 using the Five-hundred-meter
Aperture Spherical radio Telescope (FAST) for 20 minutes starting at 2025-07-23
21:27:00 UTC. The pointing center was at (RA, Dec) = (01h 16m 25.01s, +20d
37m 57.0s; J2000). Five bursts were detected with signal-to-noise ratios
(S/N) above 7, corresponding to an event rate of approximately 15 per hour
above a fluence threshold of 0.015 Jy ms, assuming an average burst width
of 3 ms.

The brightest event reached an S/N of 682 at MJD 60879.90512561738 (topocentric,
1.5 GHz), corresponding to a peak flux density of 4.5 Jy and a fluence
of 16.0 Jy ms. Including three earlier FAST sessions over the preceding
10 days (1 hour on 2025-07-17 and 0.5 hours on 2025-07-22, with 8 and 5
faint pulses detected, respectively), we estimate the rate of such bright
bursts to be 0.5 per hour, with a 1 sigma Poisson confidence interval of
0.1 to 1.8 per hour.

This result confirms that FRB 20220529 continues to emit bright bursts
that are detectable even by moderately sensitive radio telescopes. Given
the detection of this bright event and the likelihood of even brighter
bursts from this source, we encourage continued monitoring by other facilities,
including those equipped with ~10-meter-class dishes.

A link to the waterfall of this pulse: 
https://github.com/Astroyx/FRB20220529/blob/main/20250724_FRB20220529A_tracking-M01_0151.add_60879.90512561738_cut_mb8_-120.832.png

Waterfall of the pulse: https://github.com/Astroyx/FRB20220529/blob/main/20250724_FRB20220529A_tracking-M01_0151.add_60879.90512561738_cut_mb8_-120.832.png
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Password Certification: Xuan Yang (yangxuan@pmo.ac.cn)
https://www.astronomerstelegram.org/?read=17310
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ATEL #17311							     ATEL #17311

Title:	A Soft Gamma Repeater burst from CXOU J164710.2-455216/PSR
		J1647-4552
Author:	David M. Palmer on behalf of the Swift Team
Queries:	palmer@lanl.gov
Posted:	27 Jul 2025; 00:04 UT
Subjects:X-ray, Neutron Star, Soft Gamma-ray Repeater, Magnetar

As reported in GCN #41172 (Dichiara et al.), Swift/BAT has detected a short
burst 
from the Soft Gamma Repeater (SGR) 
CXOU J164710.2-455216 == PSR J1647-4552 at 2025-07-26 22:49:05 UTC

The catalog of bursts from this source as detected by BAT is listed below.

2006-09-21 01:34:51

2011-09-19 21:16:11

2011-09-19 21:25:44

2017-05-16 07:09:02

2017-10-19 04:48:48

2017-10-19 05:20:39

2017-10-19 09:58:13

2018-02-05 19:25:19

2018-02-05 19:25:46

2018-02-05 19:27:11

2018-08-23 04:57:27

2020-02-06 16:40:26

2025-07-26 22:49:05

BAT's livetime and FOV coverage implies a ~10% completeness in time for
any 
random point in the sky, so many additional bursts (e.g. ATel #11270, 
Savchenko et al., for 3 bursts on 2018-02-06) are not detected by BAT.

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Password Certification: David M. Palmer (palmer@lanl.gov)
https://www.astronomerstelegram.org/?read=17311
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