GRB 200415A: A Short Gamma-Ray Burst from a Magnetar Giant Flare?

Yang, Jun; Chand, Vikas; Zhang, Bin-Bin; Yang, Yuhan; Zhao, Xiaoxia; Shao, L.; Xiong, S. L.; Luo, Q.; Li, Xiaobo; Xiao, Shuo; Li, Cheng-Kui; Liu, Cong‐Zhan; Joshi, Jagdish C.; Sharma, V.; Chakraborty, Manoneeta; Li, Ye

doi:10.3847/1538-4357/aba745

Cited by 51 publications

(50 citation statements)

References 78 publications

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“…Following Yang et al (2020b) and Yang et al (2020a), we calculate the burst duration, T 90 , in 8 keV -800 keV energy band using the continuous time-tagged event (CTTE) data of the Fermi/GBM detector n0. The results are shown in Figure 2.…”

Section: Light Curvesmentioning

confidence: 99%

“…In addition, a third track was recently found for those short GRBs originating from magnetar giant flares (a.k.a. MGF-GRBs, e.g., GRB 200415A, Yang et al 2020a;Svinkin et al 2021;Roberts et al 2021;Zhang et al 2020a). Since there is no redshift measurement for GRB 210121A, we assign its redshift as a free parameter ranging from 10 −5 to 10 and over plot it with a dotted line in Figure 7.…”

Section: Placement On E P -E γIso Correlationmentioning

confidence: 99%

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GRB 210121A: A Typical Fireball Burst Detected by Two Small Missions

Wang,

Zheng,

Xiao

et al. 2021

Preprint

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The Chinese CubeSat Mission, Gamma Ray Integrated Detectors (GRID), recently detected its first gamma-ray burst, GRB 210121A, which was jointly observed by the Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM). This burst is confirmed by several other missions, including Fermi and Insight-HXMT. We combined multi-mission observational data and performed a comprehensive analysis of the burst's temporal and spectral properties. Our results show that the burst is special in its high peak energy, thermal-like low energy indices, and large fluence. By putting it to the E p -E γ,iso relation diagram with assumed distance, we found this burst can be constrained at the redshift range of [0.3,3.0]. The thermal spectral component is also confirmed by the direct fit of the physical models to the observed spectra. Interestingly, the physical photosphere model also constrained a redshift of z ∼ 0.3 for this burst, which help us to identify a host galaxy candidate at such a distance within the location error box. Assuming the host galaxy is real, we found the burst can be best explained by the photosphere emission of a typical fireball with an initial radius of r 0 ∼ 6.7 × 10 7 cm.

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Section: Light Curvesmentioning

confidence: 99%

Section: Placement On E P -E γIso Correlationmentioning

confidence: 99%

GRB 210121A: A Typical Fireball Burst Detected by Two Small Missions

Wang,

Zheng,

Xiao

et al. 2021

Preprint

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“…Mazets et al 1979b;Hurley et al 1999). A few Gamma-ray Bursts, namely, GRB 051103 (Ofek et al 2006;Frederiks et al 2007), GRB 070201 (Mazets et al 2008;Ofek et al 2008), and GRB 200415A (Yang et al 2020;Svinkin et al 2021) are proposed to be related to the SGR GF population.…”

Section: Introductionmentioning

confidence: 99%

Periodicity Search on X-ray Bursts of SGR J1935+2154 Using 8.5 yr of Fermi/GBM Data

Zou,

Zhang,

Zhang

et al. 2021

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We performed a systematic search for X-ray bursts of the SGR J1935+2154 using the Fermi Gammaray Burst Monitor continuous data dated from Jan 2013 to July 2021. Eight bursting phases, which consist of a total of 255 individual bursts, are identified. We further analyze the periodic properties of our sample using the Lomb-Scargle spectrum and a novel model (named "Simple Period Model") developed by ourselves. Two methods yield the same results in that those bursts exhibit a period of ∼ 237 days with a ∼58.6% duty cycle. Based on our analysis, we further predict two upcoming active windows of the X-ray bursts. As of July 8th, 2021, the beginning date of our first prediction has been confirmed by the ongoing X-ray activities of the SGR J1935+2154.

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“…After decades of researches, the radiation mechanism of GRB prompt emission is still unclear (e.g., Zhang & Yan 2011;Geng et al 2018Geng et al , 2019Lin et al 2018;Zhang et al 2018aZhang et al ,b, 2021Duan, & Wang 2019a,b;Huang et al 2019;Li et al 2019b;Yang et al 2020;Zhang 2020). The photospheric emission model seems to be a promising scenario (e.g., Abramowicz et al 1991;Thompson 1994;Mészáros & Rees 2000;Rees & Mészáros 2005;Pe'er & Ryde 2011;Fan et al 2012;Lazzati et al 2013;Ruffini et al 2013;Gao & Zhang 2015;Bégué & Pe'er 2015;Pe'er et al 2015;Ryde et al 2017;Acuner & Ryde 2018;Hou et al 2018;Meng et al 2018Meng et al , 2019Li 2019a,c,d;Acuner et al 2020;Wang et al 2020).…”

Section: Introductionmentioning

confidence: 99%

The Photosphere Emission Spectrum of Hybrid Relativistic Outflow for Gamma-ray Bursts

Meng,

Geng,

2021

Preprint

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The photospheric emission in the prompt phase is the natural prediction of the original fireball model for gamma-ray burst (GRB) due to the large optical depth (τ > 1) at the base of the outflow, which is supported by the quasi-thermal components detected in several Fermi GRBs. However, which radiation mechanism (photosphere or synchrotron) dominates in most GRB spectra is still under hot debate. The shape of the observed photosphere spectrum from a pure hot fireball or a pure Poynting-fluxdominated outflow has been investigated before. In this work, we further study the photosphere spectrum from a hybrid outflow containing both a thermal component and a magnetic component with moderate magnetization (σ 0 = L P /L Th ∼ 1 − 10), by invoking the probability photosphere model. The high-energy spectrum from such a hybrid outflow is a power law rather than an exponential cutoff, which is compatible with the observed Band function in large amounts of GRBs. Also, the distribution of the low-energy indices (corresponding to the peak-flux spectra) is found to be quite consistent with the statistical result for the peak-flux spectra of GRBs best-fitted by the Band function, with similar angular profiles of structured jet in our previous works. Finally, the observed distribution of the high-energy indices can be well understood after considering the different magnetic acceleration (due to magnetic reconnection and kink instability) and the angular profiles of dimensionless entropy with the narrower core.

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GRB 200415A: A Short Gamma-Ray Burst from a Magnetar Giant Flare?

Cited by 51 publications

References 78 publications

GRB 210121A: A Typical Fireball Burst Detected by Two Small Missions

GRB 210121A: A Typical Fireball Burst Detected by Two Small Missions

Periodicity Search on X-ray Bursts of SGR J1935+2154 Using 8.5 yr of Fermi/GBM Data

The Photosphere Emission Spectrum of Hybrid Relativistic Outflow for Gamma-ray Bursts

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