A Comprehensive Analysis of Insight-HXMT Gamma-Ray Burst Data. I. Power Density Spectrum

• DOI: 10.3847/1538-4357/ad5f90
• Publication Date: 2024-09-09T06:32:12Z
• Authors: Zi-Min Zhou; Xiang-Gao Wang; En-Wei Liang; Jia-Xin Cao; Hui-Ya Liu; Cheng-Kui Li; Bing Li; Da-Bin Lin; Tian-Ci Zheng; Rui-Jing Lu; Shao-Lin Xiong; Ling-Jun Wang; Li-Ming Song; Shuang-Nan Zhang
• Keywords: QB460-466; High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics - Phenomenology; High Energy Physics - Phenomenology (hep-ph); FOS: Physical sciences; Gamma-ray bursts; Astrophysics; Astrophysics - High Energy Astrophysical Phenomena

Abstract The power density spectrum (PDS) is a powerful tool to study light curves of gamma-ray bursts (GRBs). We show the average PDS and individual analysis with GRB data from Hard X-ray Modulation Telescope (also named Insight-HXMT). values power-law index ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>α</mml:mi> </mml:mrow> <mml:mover accent="true"> <mml:mi>P</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:msub> </mml:math> ) for long GRBs (LGRBs) vary 1.58 1.29 (for 100–245, 245–600, 600–2000 keV). Insight-HXMT allow us extend energy LGRBs up 2000 keV, relation between E obtained: <mml:mo>∝</mml:mo> <mml:msup> <mml:mi>E</mml:mi> <mml:mo>−</mml:mo> <mml:mn>0.09</mml:mn> </mml:msup> (8–2000 first systematically investigate PDSs short (SGRBs), obtain <mml:mn>0.07</mml:mn> (8–1000 keV), where 1.86 1.34. distribution an α SGRB consistent that LGRB, value group dominant timescale (the bent law) higher than no single law). Both SGRBs similar , which indicates they may be result stochastic processes. Typical τ are s 0.02 s, respectively. It seems varies in proportion duration T 90 <mml:mi>τ</mml:mi> <mml:msubsup> <mml:mi>T</mml:mi> <mml:mn>90</mml:mn> <mml:mn>0.86</mml:mn> </mml:msubsup> . curve superposing number pulses different timescales. No periodic or quasi-periodic signal above 3 σ significance threshold found our sample.