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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17836, 17837
Message-Id: <20260608070539.757F828807EB@server.astronomerstelegram.org>
Date: Mon,  8 Jun 2026 03:05:39 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17836							     ATEL #17836

Title:	Extraordinary radio flaring activity of X-ray binary Cyg X-3
		in 2026
Author:	S. A. Trushkin, P. G. Tsybulev, N. N. Bursov,  (SAO RAS, Russia)
Queries:	sergei.trushkin@gmail.com
Posted:	7 Jun 2026; 09:42 UT
Subjects:Radio, Millimeter, X-ray, Gamma Ray, >GeV, Binary, Black
		Hole

We carry  out the multi-frequency monitoring of the Galactic microquasars
with the RATAN-600 radio telescope on 10 January, 6 and 26 April, and now
on 6 June 2026 we detected the  giant flares  from the X-ray and Gamma-ray
binary, microquasar Cygnus X-3 at frequencies 1.45 - 30 GHz (see ATel #17742).
The three first flares were brighter than 10 Jy at 4.7 GHz, and higher
that 20 Jy at 1.45 GHz and probably current flare in June will be bright
also. The flares are characterized by the optically thin  synchrotron spectra
with power law dependence at high frequencies with variable spectral indices
(from -0.3  to -0.8) and optically thick spectra with positive spectral
indices (usually from +1 to +2) at lower frequencies  in first 1-3 days.
All these flares associated with the X-ray transition from long-term hyper-soft
X-ray states to hard states according Swift/BAT data (https://swift.gsfc.nasa.gov/results/transients/CygX-3).
Moreover the flares are clearly detected in Gamma-rays (0.1-300 GeV) with
Fermi-LAT observatory (https://fermi.gsfc.nasa.gov/ssc/data/access/lat/msl_lc/source/Cygnus_X-3).
Spectra of Cyg X-3 on 6 and  7 June (and will be further), are  given 
<a href="http://www.sao.ru/hq/lran/XB/CygX-3/CygX-3_sp_2026Jun.png"> here
</a>. The light curves at 2.25, 4.7 and 8.2 GHz and Fermi/LAT fluxes are
given below. 
Multi-band observations are  encouraged as soon as possible.

Radio light curves of Cyg X-3 from 5 April 2026 and Fermi/LAT fluxes at
0.1-300 GeV: http://www.sao.ru/hq/lran/XB/CygX-3/CygX-3_lc_2026Apr-Jun.png
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Password Certification: Sergei  Trushkin (satr@sao.ru)
https://www.astronomerstelegram.org/?read=17836
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ATEL #17837							     ATEL #17837

Title:	Eight FRBs discovered in the FAST POP survey
Author:	L. Qian(NAOC), Y. C. Zhang(NAOC), M. Zhu(NAOC), P. Jiang(NAOC),
		G. Y. Zhang(NAOC), L. Y. Wang(NAOC), X. Y. Zhang(NAOC), R. P. Eatough(NAOC),
		Z. Pan(NAOC)
Queries:	lqian@nao.cas.cn
Posted:	7 Jun 2026; 15:46 UT
Subjects:Radio, Pulsar, Fast Radio Burst

We performed a systematic search of single pulses by a TransientX-based
pipeline with a dispersion measure range of 10 cm^-3 pc to 5000 cm^-3 pc
in the POP (Piggyback Observation of Pulsars, https://fast.bao.ac.cn/cms/article/2034282224688386050)
survey, with a S/N threshold of 8.0.

Eight FRBs have been detected following the previously reported one (ATeL#
17800). The details of the observation can also be found in this previous
ATeL. Except a possible repeating one (6 pulses detected) waiting for further
confirmation, the details of the other 7 FRBs are listed below.

(name  RA(J2000)  Dec(J2000)  DM  Width(ms)  SNR)

(FRB 20241019D  08:21:29.60  -10:15:52.60  2710.2  6.7  21.3) 
(FRB 20250511A  00:42:59.26  +63:17:28.44  1330.4  8.1  73.1) 
(FRB 20250716C  09:05:5.00  +56:00:44.90  580.1  1.2  43.6) 
(FRB 20251011A  10:22:56.34  +06:27:22.40  1683.7  12.0  24.3) 
(FRB 20251125A  10:23:47.53  +09:51:24.74  585.3  12.0  20.7) 
(FRB 20251219A  09:21:18.97  +10:23:21.12  568.3  9.8  31.4) 
(FRB 20260326A  06:56:39.17  -12:20:8.62  1288.1  9.8  18.2)

This work made use of the data from FAST (Five-hundred-meter Aperture Spherical
radio Telescope) (https://cstr.cn/31116.02.FAST). FAST is a Chinese national
mega-science facility, operated by the National Astronomical Observatories,
Chinese Academy of Sciences.

POP, Piggyback Observation of Pulsars: https://fast.bao.ac.cn/cms/article/2034282224688386050
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Password Certification: Lei Qian (lqian@nao.cas.cn)
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