Overall spectral properties of prompt emissions with diverse segments in<i>Swift</i>/BAT short gamma-ray bursts

Li, X. J.; Zhang, Z. B.; Zhang, K.

doi:10.1051/0004-6361/202140747

Cited by 4 publications

(3 citation statements)

References 81 publications

(91 reference statements)

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“…LGRBs and 93 SGRBs as our data set III. The traditional S/N > 3 criterion in each time bin has been adopted to distinguish the EE segments (see, e.g., von Kienlin et al 2019;Li et al 2021aLi et al , 2022, which is slightly different from the results in the literature (Zhang et al 2016;Kisaka et al 2017;Yu et al 2020;. It is noticeable that the ratio of short to long GRBs remains almost unchanged after these EE GRBs are excluded.…”

Section: Samplementioning

confidence: 90%

Reclassifying Swift Gamma-Ray Bursts with Diverse Duration Distributions

Deng

Zhang

et al. 2022

ApJ

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We select the largest sample of Swift gamma-ray bursts (GRBs) so far to reexamine the classification in terms of time duration, hardness ratio, and physical collapse model. To analyze the sample selection effect, we divide the observed Swift GRB sample into four subsamples according to signal-to-noise level, spectral quality, and extended emission. First, we find that only the sample of Swift GRBs with well-measured peak energy can be evidently divided into two types at a boundary of ∼1 s, and other data sets are well described by three Gaussian functions. Using Swift GRBs with known redshift, a Kolmogorov–Smirnov test shows the intrinsic duration distributions of five data sets are equally distributed. Second, we ascertain in the plane of hardness ratio versus duration that the hardness ratio of short GRBs is significantly higher than those of middle classes and long GRBs, while the latter two components are the same in statistics, implying the so-called middle class to be artificial. Third, we apply a collapse model to discriminate the boundaries between collapse and noncollapse Swift bursts. It is interesting to find that a significant fraction, ≥30%, of Swift short GRBs could have originated from the collapsing progenitors, while all long GRBs are produced from the collapsars only. Finally, we point out that short GRBs with extended emission are the main contributors to the noncollapsar population with longer duration.

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Section: Samplementioning

confidence: 90%

Reclassifying Swift Gamma-Ray Bursts with Diverse Duration Distributions

Deng

Zhang

et al. 2022

ApJ

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“…We take two steps to obtain the more accurate spectral lags. First, in order to obtain the smooth CCF curves, we follow Zhang et al (2006aZhang et al ( , 2006b to fit the light-curve data using the "KRL" function of individual GRB pulses and obtain four smooth light-curve pulses (Li et al 2020(Li et al , 2021a(Li et al , 2022a. Then, we perform the CCF analysis with the Stingray Python package (Huppenkothen et al 2019b(Huppenkothen et al , 2019a.…”

Section: Discussionmentioning

confidence: 99%

Multiwavelength Analysis of the Supernova-associated Low-luminosity GRB 171205A

Li,

Zhang,

Huang

et al. 2024

ApJ

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Multiwavelength properties of the nearby supernova (SN)-associated low-luminosity GRB 171205A are investigated in depth to constrain its physical origin synthetically. The pulse width is found to be correlated with energy with a power-law index of −0.24 ± 0.07, which is consistent with the indices of other SN-associated gamma-ray bursts (SN/GRBs) but larger than those of long GRBs. By analyzing the overall light curve of its prompt gamma rays and X-ray plateaus simultaneously, we infer that the early X-rays together with the gamma-rays should reflect the activities of the central engine, while the late X-rays may be dominated by the interaction of external shocks with circumburst material. In addition, we find that the host radio flux and offset of GRB 171205A are similar to those of other nearby low-luminosity GRBs. We adopt nine SN/GRBs with measured offset to build a relation between peak luminosity (L γ,p ) and spectral lag (τ) as L γ,p ∝ τ −1.91±0.33. The peak luminosity and the projected physical offset of 12 SN/GRBs and 10 kilonova-associated GRBs are found to be moderately correlated, suggesting their different progenitors. The multiwavelength afterglow fitted with a top-hat jet model indicates that the jet half-opening angle and the viewing angle of GRB 171205A are ∼34.°4 and 41.°8, respectively, which implies that the off-axis emissions are dominated by the peripheral cocoon rather than the jet core.

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“…They proposed that the precursor, the main burst, and the extended emission have the same physical origin. Li et al (2022) studied the precursors of LGRBs, and the temporal behavior of the precursor is similar to that of the main burst. In our work, it is shown that the precursor, the main emission, and the extended emission are dominated by the thermal emission.…”

Section: Discussionmentioning

confidence: 99%

A Comparative Analysis of Two Peculiar Gamma-Ray Bursts: GRB 230307A and GRB 211211A

Peng,

Chen,

Mao

2024

ApJ

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GRB 211211A is a peculiar long gamma-ray burst (GRB) with very high brightness and short burst properties. Its full light curve consists of three emission episodes, i.e., a precursor, a main burst, and an extended emission. We find that a recently detected long-duration GRB 230307A also includes the three consistent emission episodes. Furthermore, the two bursts have similar redshifts, 0.076 and 0.065, respectively. We perform a detailed temporal and spectral analysis of the two GRBs to compare their temporal and spectral properties. Our analysis shows that the two bursts share great similarities for both the whole emission and the three corresponding emission phases, which are listed as follows: (1) they have near zero spectral lag; (2) they have very short minimum variability timescale (MVT); (3) they lie in the same region of in the MVT–T 90, Amati relation and hardness–T 90 planes; (4) the three phases are quasi-thermal spectra; (5) both the peak energy and the low-energy index track the flux; (6) the time-resolved spectra are much wider than those of the blackbody predicted by the model; (7) there are strong correlations between thermal flux and total flux and the correlation coefficients, and the slopes for the corresponding stages are very consistent; and (8) the photosphere emission properties are very consistent. Other investigations and observations suggest that the two GRBs indeed belong to a short burst with a compact star merger origin. Therefore, we think that GRB 230307A and GRB 211211A are rare and similar GRBs, and the photospheric radiation can interpret their radiation mechanisms.

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Overall spectral properties of prompt emissions with diverse segments inSwift/BAT short gamma-ray bursts

Cited by 4 publications

References 81 publications

Reclassifying Swift Gamma-Ray Bursts with Diverse Duration Distributions

Reclassifying Swift Gamma-Ray Bursts with Diverse Duration Distributions

Multiwavelength Analysis of the Supernova-associated Low-luminosity GRB 171205A

A Comparative Analysis of Two Peculiar Gamma-Ray Bursts: GRB 230307A and GRB 211211A

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