scholarly journals Compton Scattering Effects on the Spectral and Temporal Properties of Terrestrial Gamma‐Ray Flashes

2019 ◽  
Vol 124 (8) ◽  
pp. 7220-7230 ◽  
Author(s):  
Wei Xu ◽  
Sebastien Celestin ◽  
Victor P. Pasko ◽  
Robert A. Marshall
Keyword(s):  
Compton Scattering ◽  
Gamma Ray ◽  
Temporal Properties ◽  
Scattering Effects

Compton scattering effects on the duration of terrestrial gamma-ray flashes

2012 ◽  
Vol 39 (2) ◽  
pp. n/a-n/a ◽  
Author(s):  
Sebastien Celestin ◽  
Victor P. Pasko
Keyword(s):  
Compton Scattering ◽  
Gamma Ray ◽  
Scattering Effects

scholarly journals Gamma‐Ray Collimator Penetration and Scattering Effects

1957 ◽  
Vol 28 (10) ◽  
pp. 1200-1207 ◽  
Author(s):  
Robert L. Mather
Keyword(s):  
Gamma Ray ◽  
Scattering Effects

Saturated Compton scattering models for the soft gamma-ray repeater bursts

1997 ◽  
Author(s):  
I. A. Smith ◽  
E. P. Liang ◽  
A. Crider ◽  
D. Lin ◽  
M. Kusunose
Keyword(s):  
Compton Scattering ◽  
Gamma Ray

scholarly journals The properties of prompt emission in short gamma-ray bursts with extended emission observed by Fermi/GBM

2020 ◽  
Vol 492 (3) ◽  
pp. 3622-3630
Author(s):  
Lin Lan ◽  
Rui-Jingi Lu ◽  
Hou-Jun Lü ◽  
Jun Shen ◽  
Jared Rice ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Large Scatter ◽  
Intrinsic Properties ◽  
Temporal Properties ◽  
Peak Energy ◽  
Peak Flux ◽  
Short Grbs ◽  
Prompt Emission ◽  
Extended Emission

ABSTRACT Short gamma-ray bursts (GRB) with extended emission (EE) that are composed of an initial short hard spike followed by a long-lasting EE are thought to comprise a sucategory of short GRBs. The narrow energy band available during the Swift era, combined with a lack of spectral information, prevented the discovery of the intrinsic properties of these events. In this paper, we perform a systematic search of short GRBs with EE using all available Fermi/GBM data. The search identified 26 GBM-detected short GRBs with EE that are similar to GRB 060614 observed by Swift/BAT. We focus on investigating the spectral and temporal properties of both the hard spike and the EE component of all 26 GRBs, and explore differences and possible correlations between them. We find that while the peak energy (Ep) of the hard spikes is slightly harder than that of the EE, their fluences are comparable. The harder Ep seems to correspond to a larger fluence and peak flux, with a large scatter for both the hard spike and the EE component. Moreover, the Ep of both the hard spike and the EE are compared with other short GRBs. Finally, we also compare the properties of GRB 170817A with those of short GRBs with EE and find no significant statistical differences between them. We find that GRB 170817A has the lowest Ep, probably because it is off-axis.

scholarly journals Detection of gamma-ray transients with wild binary segmentation

2020 ◽  
Vol 493 (3) ◽  
pp. 4428-4441
Author(s):  
S Antier ◽  
K Barynova ◽  
P Fryzlewicz ◽  
C Lachaud ◽  
G Marchal-Duval
Keyword(s):  
Gamma Ray ◽  
Change Point Detection ◽  
Archival Data ◽  
Data Set ◽  
Temporal Properties ◽  
Background Removal ◽  
Segmentation Analysis ◽  
Binary Segmentation ◽  
Blind Search ◽  
Detection Search

ABSTRACT In the context of time domain astronomy, we present an offline detection search of gamma-ray transients using a wild binary segmentation analysis called F-WBSB targeting both short and long gamma-ray bursts (GRBs) and covering the soft and hard gamma-ray bands. We use NASA Fermi/GBM archival data as a training and testing data set. This paper describes the analysis applied to the 12 NaI detectors of the Fermi/GBM instrument. This includes background removal, change-point detection that brackets the peaks of gamma-ray flares, the evaluation of significance for each individual GBM detector, and the combination of the results among the detectors. We also explain the calibration of the ∼ 10 parameters present in the method using one week of archival data. Finally, we present our detection performance result for 60 d of a blind search analysis with F-WBSB by comparing to both the onboard and offline GBM search as well as external events found by others surveys such as Swift-BAT. We detect 42/44 onboard GBM events but also other gamma-ray flares at a rate of 1 per hour in the 4–50 keV band. Our results show that F-WBSB is capable of recovering gamma-ray flares, including the detection of soft X-ray long transients. FWBSB offers an independent identification of GRBs in combination with methods for determining spectral and temporal properties of the transient as well as localization. This is particularly useful for increasing the GRB rate and that will help the joint detection with gravitational-wave events.

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