Multifrequency observations of SGR J1935+2154

Bailes, M.; Bassa, C. G.; Bernardi, G.; Buchner, S.; Burgay, M.; Caleb, M.; Cooper, A. J.; Desvignes, G.; Groot, P.; Heywood, Ian; Jankowski, F.; Karuppusamy, R.; Krämer, M.; Malenta, Mateusz; Naldi, G.; Pilia, M.; Pupillo, G.; Rajwade, Kaustubh; Spitler, Laura; Surnis, Mayuresh; Stappers, B. W.; Addis, A.; Bloemen, S.; Bezuidenhout, Mechiel Christiaan; Bianchi, G.; Champion, D. J.; Chen, W.; Driessen, Laura; Geyer, M.; Gourdji, K.; Hessels, J. W. T.; Kondratiev, V. I.; Klein-Wolt, M.; Körding, Elmar; Poole, R. Le; Liu, K.; Lower, M. E.; Lyne, A. G.; Magro, Alessio; McBride, V. A.; Mickaliger, M. B.; Morello, Vincent; Parthasarathy, A.; Paterson, K.; Perera, B. B. P.; Pieterse, D. L. A.; Pleunis, Ziggy; Possenti, A.; Rowlinson, A.; Serylak, M.; Setti, G.; Tavani, M.; Wijers, R. A. M. J.; Veen, S. ter; Krishnan, V. Venkatraman; Vreeswijk, P. M.; Woudt, P. A.

doi:10.1093/mnras/stab749

Cited by 33 publications

(31 citation statements)

References 64 publications

(90 reference statements)

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“…The motivation for favouring a lower distance in part comes from a SNR-independent distance estimate to SGR 1935+2154 from the detection of an X-ray dust scattering ring by Mereghetti et al (2020), who estimate a distance of 4.4 +2.8 −1.3 kpc. Even more recently, Bailes et al (2021) estimated a distance to SGR 1935+2154, based on line-of-sight measures such as column density and extinction, of 1.5-6.5 kpc -again consistent with the lower estimates of the SNR. Where appropriate, we also discuss the impact of distance on our results.…”

Section: The Distance To Sgr 1935+2154mentioning

confidence: 58%

The Fast Radio Burst-emitting magnetar SGR 1935+2154 -- proper motion and variability from long-term Hubble Space Telescope monitoring

Lyman,

Levan,

Wiersema

et al. 2021

Preprint

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We present deep Hubble Space Telescope near-infrared (NIR) observations of the magnetar SGR 1935+2154 from June 2021, approximately 6 years after the first HST observations, a year after the discovery of fast radio burst like emission from the source, and in a period of exceptional high frequency activity. Although not directly taken during a bursting period the counterpart is a factor of ∼ 1.5 to 2.5 brighter than seen at previous epochs with F140W(AB) = 24.65 ± 0.02 mag. We do not detect significant variations of the NIR counterpart within the course of any one orbit (i.e. on minutes-hour timescales), and contemporaneous X-ray observations show SGR 1935+2154 to be at the quiescent level. With a time baseline of 6 years from the first identification of the counterpart we place stringent limits on the proper motion of the source, with a measured proper motion of µ = 3.1 ± 1.5 mas yr −1 . The direction of proper motion indicates an origin of SGR 1935+2154 very close to the geometric centre of SNR G57.2+08, further strengthening their association. At an adopted distance of 6.6 ± 0.7 kpc, the corresponding tangential space velocity is ν T = 97 ± 48 km s −1 (corrected for differential Galactic rotation and peculiar Solar motion), although its formal statistical determination may be compromised owing to few epochs of observation. The current velocity estimate places it at the low end of the kick distribution for pulsars, and makes it among the lowest known magnetar kicks. When collating the few-magnetar kick constraints available, we find full consistency between the magnetar kick distribution and the much larger pulsar kick sample.

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Section: The Distance To Sgr 1935+2154mentioning

confidence: 58%

The Fast Radio Burst-emitting magnetar SGR 1935+2154 -- proper motion and variability from long-term Hubble Space Telescope monitoring

Lyman,

Levan,

Wiersema

et al. 2021

Preprint

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“…Moreover, no radio bursts were detected in the observation campaigns by the Arecibo, Effelsberg, LOFAR, MeerKAT, MK2 and Northern Cross radio telescopes (not shown in Fig. 1) [29]. Two additional radio bursts separated by ∼ 1.4s on May 24, 2020 [27] were detected following an X-ray burst detected by HXMT during a joint campaign between the Westerbork, Onsala, and Toruń radio dishes.…”

Section: Pos(icrc2021)777mentioning

confidence: 87%

“…Optical: No optical emission has been detected by the BOOTES-3 telescopes observing contemporaneously to the first detected FRB [28]. No optical emission was seen by LCOGT, other BOOTES telescopes or MeerLICHT optical telescope [29].…”

Section: Pos(icrc2021)777mentioning

confidence: 93%

Observation of burst activity from SGR1935+2154 associated to first galactic FRB with H.E.S.S.

Kostunin¹,

Abdalla²,

Aharonian³

et al. 2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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Fast radio bursts (FRB) are enigmatic powerful single radio pulses with durations of several milliseconds and high brightness temperatures suggesting coherent emission mechanism. For the time being a number of extragalactic FRBs have been detected in the high-frequency radio band including repeating ones. The most plausible explanation for these phenomena is magnetar hyperflares. The first observational evidence of this scenario was obtained in April 2020 when an FRB was detected from the direction of the Galactic magnetar and soft gamma repeater SGR1935+2154. The FRB was preceded with a number of soft gamma-ray bursts observed by Swift-BAT satellite, which triggered the follow-up program of the H.E.S.S. imaging atmospheric Cherenkov telescopes (IACTs). H.E.S.S. has observed SGR1935+2154 over a 2 hour window few hours prior to the FRB detection by STARE2 and CHIME. The observations overlapped with other X-ray bursts from the magnetar detected by INTEGRAL and Swift-BAT, thus providing first observations of a magnetar in a flaring state in the very-high energy domain. We present the analysis of these observations, discuss the obtained results and prospects of the H.E.S.S. follow-up program for soft gamma repeaters and anomalous X-ray pulsars.

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“…Imaging and timing modes are used in the study of objects such as magnetars, 18 and phase stability is important to reach high signal-to-noise ratio and high contrast (in imaging and time domain science). Signal-to-noise ratio in signal chains are, amongst other things, affected by jitter 19 and the effect of phase stability on coherence loss is well known as described in Ref.…”

Section: Key Timing Requirement and Science Driversmentioning

confidence: 99%

Design, implementation, and qualification of high-performance time and frequency reference for the MeerKAT telescope

Burger

Siebrits

Gamatham

et al. 2022

J. Astron. Telesc. Instrum. Syst.

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The details of the MeerKAT radio telescope's time and frequency reference subsystem that enables sampling via low-jitter, low-drift microwave clock signals, and absolute timing (≤5 ns accurate) are discussed. The subsystem's microwave and pulse per second transmission parts are now fully qualified and commissioned for the ultra high frequency (UHF) and L-bands and also provide for a 100-MHz interface and timing interfaces for S-band receivers that were installed. The subsystem includes a cable measurement system called the Karoo array timing system (KATS). Performance and differences on different bands and seasonal drift of the cable delay measurement of KATS are reported. A time scale called the Karoo Telescope Time (KTT) (which is estimated from tracking a few atomic clocks via new software) and the issuing of timing bulletins to users have been largely implemented and verified. Absolute timing calibration and linkage of KTT to the global positioning system time scale and to different UTC(k) realizations of the Coordinated Universal Time (UTC) instances are described. The subsystem uniquely enables high-fidelity sampling and stable tied array configuration. The latter configuration enables timing and transient science over time spans of 5 to 10 years. Simultaneous subarraying is supported. The backend is unique for radio telescopes in terms of being very deterministic as far as timing is concerned.

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Multifrequency observations of SGR J1935+2154

Cited by 33 publications

References 64 publications

The Fast Radio Burst-emitting magnetar SGR 1935+2154 -- proper motion and variability from long-term Hubble Space Telescope monitoring

The Fast Radio Burst-emitting magnetar SGR 1935+2154 -- proper motion and variability from long-term Hubble Space Telescope monitoring

Observation of burst activity from SGR1935+2154 associated to first galactic FRB with H.E.S.S.

Design, implementation, and qualification of high-performance time and frequency reference for the MeerKAT telescope

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