First Results from the Taiwanese-American Occultation Survey (TAOS)

Zhang, Z.-W.; Bianco, Federica; Lehner, M. J.; Coehlo, N. K.; Wang, J.-H.; Mondal, Soumen; Alcock, Charles; Axelrod, T. S.; Byun, Yong Ik; Chen, W. P.; Cook, K. H.; Dave, R.; Pater, Imke de; Porrata, R.; Kim, Dae Won; King, S. K.; Lee, T.; Lin, H. C.; Lissauer, Jack J.; Marshall, S.; Protopapas, Pavlos; Rice, John A.; Schwamb, Megan E.; Wang, S.-Y.; Wen, C. Y.

doi:10.1086/592741

Cited by 30 publications

(36 citation statements)

References 23 publications

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“…This may be caused by a sample selection effect. A power-law index ∼ 0.2 ∼ 0.3 was also reported in the literature for energy dependence of GRB durations and pulse durations in some GRBs (e.g., Fenimore et al 1995;Norris et al 2005;Zhang 2008).…”

Section: Energy Dependence Of T 90supporting

confidence: 70%

A COMPREHENSIVE ANALYSIS OFFERMIGAMMA-RAY BURST DATA. III. ENERGY-DEPENDENTT₉₀DISTRIBUTIONS OF GBM GRBs AND INSTRUMENTAL SELECTION EFFECT ON DURATION CLASSIFICATION

Qin

Liang

et al. 2012

ApJ

103

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The durations (T 90 ) of 315 GRBs detected with Fermi/GBM (8-1000 keV) by 2011 September are calculated using the Bayesian Block method. We compare the T 90 distributions between this sample and those derived from previous/current GRB missions. We show that the T 90 distribution of this GRB sample is bimodal, with a statistical significance level being comparable to those derived from the BeppoSAX/GRBM sample and the Swift/BAT sample, but lower than that derived from the CGRO/BATSE sample. The short-to-long GRB number ratio is also much lower than that derived from the BATSE sample, i.e., 1:6.5 vs 1:3. We measure T 90 in several bands, i.e., 8-15, 15-25, 25-50, 50-100, 100-350, and 350-1000 keV, to investigate the energy-dependence effect of the bimodal T 90 distribution. It is found that the bimodal feature is well observed in the 50-100 and 100-350 keV bands, but is only marginally acceptable in the 25-50 keV and 350-1000 keV bands. The hypothesis of the bimodality is confidently rejected in the 8-15 and 15-25 keV bands. The T 90 distributions in these bands are roughly consistent with those observed by missions with similar energy bands. The parameter T 90 as a function of energy followsT 90 ∝ E −0.20±0.02 for long GRBs.Considering the erratic X-ray and optical flares, the duration of a burst would be even much longer for most GRBs. Our results, together with the observed extended emission of some short GRBs, indicate that the central engine activity time scale would be much longer than T 90 for both long and short GRBs and the observed bimodal T 90 distribution may be due to an instrumental selection effect.Available in the electronic version only.

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Section: Energy Dependence Of T 90supporting

confidence: 70%

A COMPREHENSIVE ANALYSIS OFFERMIGAMMA-RAY BURST DATA. III. ENERGY-DEPENDENTT₉₀DISTRIBUTIONS OF GBM GRBs AND INSTRUMENTAL SELECTION EFFECT ON DURATION CLASSIFICATION

Qin

Liang

et al. 2012

ApJ

103

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“…Norris et al (1996) drew the similar conclusion with a sample of 41 bright long GRBs detected by BATSE. Other authors also studied the same power-law relation but they gave very different indexes for their samples (Peng et al 2006;Zhang 2008;Golkhou et al 2015;Shao et al 2017). In addition, some literatures had investigated in details about the relation between the different timescales and temporal structures of GRBs pulses (Qin et al 2004;, where three main timescales, namely angular spreading timescale, cooling timescale and dynamic timescale, had been considered to form the shapes of GRB pulses.…”

Section: Introductionmentioning

confidence: 99%

Properties of Short GRB Pulses in the Fourth BATSE Catalog: Implications for the Structure and Evolution of the Jetted Outflows

X.J.Li

Z.B.Zhang

C.T.Zhang

et al. 2020

ApJ

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Considering the shortage of comparative studies on pulse temporal characteristics between singlepeaked short gamma-ray bursts (sGRBs) and double-peaked sGRBs, we examine the pulse properties of a sample of 100 BATSE sGRBs using the BATSE Time-Tagged Event (TTE) data with a 5-ms resolution. 243 individual pulses of the single-peaked, double-peaked and triple-peaked sGRBs are fitted to get their statistical properties such as the pulse asymmetry, amplitude, peak time, and pulse width, etc. For the double-peaked sGRBs, according to the overlapping ratio between two adjacent peaks, we first define two kinds of double-peaked sGRBs as M-loose and M-tight types and find that most of the first pulses are similar to the single-peaked ones. We study the dependence of the Full Width at Half Maximum (FWHM) on the photon energy among different energy bands. Interestingly, it is found that a power-law relation with an index of -0.4 does exist between the FWHM and the photon energy for the single-and double-peaked sGRBs. More interestingly, we notice that the powerlaw relation with a positive index also exist for several special short bursts. In view of the three typical timescales of pulses, namely the angular spreading timescale, the dynamic timescale, and the cooling timescale, we propose that the diverse power-law indexes together with the profile evolution of GRB pulse can be used as an effective probe to diagnose the structure and evolution of the relativistically jetted outflows.

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“…It is well known that the intrinsic durations or light curves of GRBs are highly energy dependent (Fenimore et al 1995;Norris et al 1996;Peng et al 2006;Zhang et al 2007;Zhang 2008;Zhang et al 2012;Qin et al 2013). We note that most previous works ignored this effect and simply measured the observed durations in a fixed observed energy range.…”

Section: Introductionmentioning

confidence: 99%

COSMOLOGICAL TIME DILATION IN DURATIONS OF SWIFT LONG GAMMA-RAY BURSTS

Zhang

Fan

Shao

et al. 2013

ApJ

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Cosmological time dilation is a fundamental phenomenon in an expanding universe, which stresses that both the duration and wavelength of the emitted light from a distant object at the redshift z will be dilated by a factor of 1 + z at the observer. By using a sample of 139 Swift long GRBs with known redshift (z ≤ 8.2), we measure the observed duration (T 90 ) in the observed energy range between 140/(1 + z) keV and 350/(1 + z) keV, corresponding to a fixed energy range of 140-350 keV in the rest frame. We obtain a significant correlation between the duration and the factor 1 + z, i.e., T 90 = 10.5(1 + z) 0.94±0.26 , which is well consistent with that expected from cosmological time dilation effect.Available in the electronic version only. ⋆ E 1 and E 2 correspond to the lower (140/(1 + z)) and upper (350/(1 + z)) limit of energy range used to measure durations T 90 and T 50 .

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First Results from the Taiwanese-American Occultation Survey (TAOS)

Cited by 30 publications

References 23 publications

A COMPREHENSIVE ANALYSIS OFFERMIGAMMA-RAY BURST DATA. III. ENERGY-DEPENDENTT₉₀DISTRIBUTIONS OF GBM GRBs AND INSTRUMENTAL SELECTION EFFECT ON DURATION CLASSIFICATION

A COMPREHENSIVE ANALYSIS OFFERMIGAMMA-RAY BURST DATA. III. ENERGY-DEPENDENTT₉₀DISTRIBUTIONS OF GBM GRBs AND INSTRUMENTAL SELECTION EFFECT ON DURATION CLASSIFICATION

Properties of Short GRB Pulses in the Fourth BATSE Catalog: Implications for the Structure and Evolution of the Jetted Outflows

COSMOLOGICAL TIME DILATION IN DURATIONS OF SWIFT LONG GAMMA-RAY BURSTS

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First Results from the Taiwanese-American Occultation Survey (TAOS)

Cited by 30 publications

References 23 publications

A COMPREHENSIVE ANALYSIS OFFERMIGAMMA-RAY BURST DATA. III. ENERGY-DEPENDENTT90DISTRIBUTIONS OF GBM GRBs AND INSTRUMENTAL SELECTION EFFECT ON DURATION CLASSIFICATION

A COMPREHENSIVE ANALYSIS OFFERMIGAMMA-RAY BURST DATA. III. ENERGY-DEPENDENTT90DISTRIBUTIONS OF GBM GRBs AND INSTRUMENTAL SELECTION EFFECT ON DURATION CLASSIFICATION

Properties of Short GRB Pulses in the Fourth BATSE Catalog: Implications for the Structure and Evolution of the Jetted Outflows

COSMOLOGICAL TIME DILATION IN DURATIONS OF SWIFT LONG GAMMA-RAY BURSTS

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A COMPREHENSIVE ANALYSIS OFFERMIGAMMA-RAY BURST DATA. III. ENERGY-DEPENDENTT₉₀DISTRIBUTIONS OF GBM GRBs AND INSTRUMENTAL SELECTION EFFECT ON DURATION CLASSIFICATION

A COMPREHENSIVE ANALYSIS OFFERMIGAMMA-RAY BURST DATA. III. ENERGY-DEPENDENTT₉₀DISTRIBUTIONS OF GBM GRBs AND INSTRUMENTAL SELECTION EFFECT ON DURATION CLASSIFICATION