Burst Properties of the Most Recurring Transient Magnetar SGR J1935+2154

Lin, Lin; Göǧüş, E.; Roberts, O. J.; Kouveliotou, C.; Kaneko, Yuki; Horst, A. J. van der; Younes, George

doi:10.3847/1538-4357/ab818f

Cited by 73 publications

(84 citation statements)

References 53 publications

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“…The rotation period (3.24 s) and surface dipole magnetic field (2.2 × 10 14 G) of SGR 1935+2154 is typical of the Milky Way magnetar population 2 . Although SGR 1935+2154 was in a phase of increased X-ray burst activity when ST 200428A was detected, increased burst activity has previously been observed from this SGR 30 . Indeed, SGR 1935+2154 is the most prolific known burster among the magnetar population 30 .…”

mentioning

confidence: 60%

“…Although SGR 1935+2154 was in a phase of increased X-ray burst activity when ST 200428A was detected, increased burst activity has previously been observed from this SGR 30 . Indeed, SGR 1935+2154 is the most prolific known burster among the magnetar population 30 . The X-ray burst coincident with ST 200428A (isotropicequivalent energy release of 8.3(8) × 10 39 erg) was a typical example of a magnetar burst 2 , with perhaps some unusual spectral characteristics 6 .…”

mentioning

confidence: 60%

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A fast radio burst associated with a Galactic magnetar

Bochenek

Ravi

Belov

et al. 2020

Nature

646

469

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mentioning

confidence: 60%

mentioning

confidence: 60%

A fast radio burst associated with a Galactic magnetar

Bochenek

Ravi

Belov

et al. 2020

Nature

646

469

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“…However, a thermal origin is preferred for normal short bursts from magnetars 26,27 . We notice that ∼ 6% of the bursts (7/109) from SGR J1935+2154 detected with Fermi/GBM between 2014 and 2016 can be best fit with a power-law model 13 19 , then the observed fluence should be ∼ 4 × 10 −15 erg cm −2 in 1-250 keV, which is far below the sensitivity limits of the X-ray telescopes currently in orbit (or in the foreseeable future). This may explain the non-detection of the X-ray counterpart of any cosmological FRB so far.…”

Section: Insight-hxmt Detected a Series Of 11 Bursts Within About 17 mentioning

confidence: 78%

Identification of a non-thermal X-ray burst with the Galactic magnetar SGR J1935+2154 and a fast radio burst using Insight-HXMT

Li¹,

Lin²,

Xiong³

et al. 2020

Preprint

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Fast radio bursts (FRBs) are short pulses observed in radio band from cosmological distances, some of which emit repeating bursts. The physical origins of these mysterious events have been subject to wide speculations and heated debates. One class of models invoke soft gamma-ray repeaters (SGRs), or magnetars, as the sources of FRBs. Magnetars are rotating neutron stars with extremely strong magnetic field and can sporadically emit bursts from X-ray (keV) to soft gamma-ray (sub-MeV) with duration from 10􀀀2 s to 102 s. However, even though some bright radio bursts have been observed from some magnetars, no FRB-like events had been detected to be associated with any magnetar burst, including one giant flare, and no radio burst has been associated with any X-ray event from any magnetar. Therefore, there is still no observational evidence for magnetar-FRB association up to today. Recently, a pair of FRB-like bursts (FRB~200428 hereafter) separated by 30 milliseconds (ms) were detected from the general direction of the Galactic magnetar SGR~J1935+2154. Here we report the detection of a non-thermal X-ray burst in the 1--250\,keV energy band with the Insight-HXMT satellite, which we identify as emitted from SGR~J1935+2154. The burst showed two hard peaks with a separation of ms, consistent with the separation between the two bursts in FRB~200428. The delay time between the double radio and X-ray peaks is 8:57s, fully consistent with the dispersion delay of FRB~200428. We thus identify the non-thermal X-ray burst is associated with FRB~200428 whose high energy counterpart is the two hard peaks in X-ray. Our results suggest that the non-thermal X-ray burst and FRB~200428 share the same physical origin in an explosive event from SGR~J1935+2154.

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“…Since its discovery, the source has sporadically gone into outburst over the past few years (Lin et al 2020a), with the most recent being reported as a "forest" of X-ray bursts detected during 2020 April 27-28 (Palmer & Team 2020;Younes et al 2020). Following the onset of the outburst, an unprecedented bright millisecond-duration radio burst (hereafter FRB 200428) was detected from the source by the Canadian Hydrogen Intensity Mapping Experiment (CHIME; The CHIME/FRB Collaboration et al 2020) and STARE2 (Bochenek et al 2020) telescopes, with an energy release that was ∼1000× brighter than any known radio burst from a Galactic source.…”

Section: Introductionmentioning

confidence: 99%

Constraining the X-Ray–Infrared Spectral Index of Second-timescale Flares from SGR 1935+2154 with Palomar Gattini-IR

Ashley

Andreoni

et al. 2020

ApJL

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The Galactic magnetar SGR 1935+2154 has been reported to produce the first example of a bright millisecondduration radio burst (FRB 200428) similar to the cosmological population of fast radio bursts (FRBs). The detection of a coincident bright X-ray burst represents the first observed multiwavelength counterpart of an FRB. However, the search for similar emission at optical wavelengths has been hampered by the high inferred extinction on the line of sight. Here, we present results from the first search for second-timescale emission from the source at near-infrared (NIR) wavelengths using the Palomar Gattini-IR observing system in the J band, enabled by a novel detector readout mode that allows short exposure times of ≈0.84 s with 99.9% observing efficiency. With a total observing time of ≈12 hr (≈47,728 images) during its 2020 outburst, we place median 3σ limits on the secondtimescale NIR fluence of 18Jy ms (13.1 AB mag). The corresponding extinction-corrected limit is 125Jy ms for an estimated extinction of A J =2.0 mag. Our observations were sensitive enough to easily detect an NIR counterpart of FRB 200428 if the NIR emission falls on the same power law as observed across its radio to X-ray spectrum. We report nondetection limits from epochs of four simultaneous X-ray bursts detected by the Insight-HXMT and NuSTAR telescopes during our observations. These limits provide the most stringent constraints to date on fluence of flares at ∼10 14 Hz, and constrain the fluence ratio of the NIR emission to coincident X-ray bursts to R NIR 0.025 (fluence index 0.35).

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Burst Properties of the Most Recurring Transient Magnetar SGR J1935+2154

Cited by 73 publications

References 53 publications

A fast radio burst associated with a Galactic magnetar

A fast radio burst associated with a Galactic magnetar

Identification of a non-thermal X-ray burst with the Galactic magnetar SGR J1935+2154 and a fast radio burst using Insight-HXMT

Constraining the X-Ray–Infrared Spectral Index of Second-timescale Flares from SGR 1935+2154 with Palomar Gattini-IR

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