Inflight performance of the GECAM Gamma-ray and Charge particle Detectors

Li, X. Q.; Xiong, S. L.; Gong, Ke; Zhang, D. L.; An, Zhongfu; Xu, Y. B.; Liu, Y. Q.; Cai, Chonghai; Chang, Zhe; Chen, G.; Chen, C.; Du, Y. Y.; Gao, Min; Gao, Ruihong; Guo, D. Y.; He, J.; Hou, Dongjie; C., Li,; Li, C. Y.; G., Li,; Li, Q. X.; Li, X. F.; S., Li, M.; Liang, X. H.; Liu, X. J.; Lu, Felix; Lü, H.; Ma, Xinhua; Meng, Bin; Peng, W. X.; Qiao, Rui; Song, Liming; Sun, X.; Wang, H.; Z., Wang, H.; Wang, J. Z.; Wang, Pu; Wang, Y. S.; Wen, Xiang-Yang; Xiao, S. Y.; Xu, Yupeng; Yang, Shuo; Yang, Jiajia; Yi, Q. B.; Zhang, Fan; Zhang, S. N.; Zhang, C. Y.; Zhang, C. M.; Zhang, Fei; Zhang, K.; Zhang, P.; Zhao, X. Y.; Zhao, Yuzhe; Zheng, S.; Zhou, X. X.

doi:10.48550/arxiv.2112.04772

Cited by 5 publications

(4 citation statements)

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“…On the other hand, although some magnetar theories predict the possible existence of QPOs of tens of Hz in an SGRB precursor (e.g., Sotani et al 2007;Tews 2017;Zhang et al 2022), the duration of the precursors of SGRBs is just about ∼0.1 s (see Table 1), which means that only a few cycles of oscillations could possibly exist in a precursor, making the QPO search even more difficult. A definitive answer may come from sufficient statistics observed by more advanced detectors and higher detection signal-to-noise ratios, or a joined analysis using the light curves obtained by multiple GRB detectors, such as Fermi/GBM (Meegan et al 2009), Insight-HXMT/HE (Liu et al 2020;Zhang et al 2020), Swift/BAT (Barthelmy et al 2005), and GECAM (Li et al 2021;Xiao et al 2022c). Detectors with a similar energy response will be more advantageous, such as GECAM and GBM (Xiao et al 2022d), as will combining the information from theoretical models and the QPO evolution with time as a template in searching for QPOs (Dichiara et al 2013).…”

Section: Discussionmentioning

confidence: 99%

Search for Quasiperiodic Oscillations in Precursors of Short and Long Gamma-Ray Bursts

Xiao

Peng²,

Zhang³

et al. 2022

ApJ

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The precursors of short and long gamma-ray bursts (SGRBs and LGRBs) can serve as probes of their progenitors, as well as shedding light on the physical processes of mergers or core-collapse supernovae. Some models predict the possible existence of quasiperiodic oscillations (QPOs) in the precursors of SGRBs. Although many previous studies have performed QPO searches in the main emission of SGRBs and LGRBs, so far there were no systematic QPO searches in their precursors. In this work, we perform a detailed QPO search in the precursors of SGRBs and LGRBs detected by Fermi/Gamma-ray Burst Monitor (GBM) from 2008 to 2019 using the power density spectrum (PDS) in the frequency domain and Gaussian processes in the time domain. We do not find any convinced QPO signal with significance above 3σ, possibly due to the low fluxes of precursors. Finally, the PDS continuum properties of both the precursors and main emissions are also studied for the first time, and no significant difference is found in the distributions of the PDS slope for precursors and main emissions in both SGRBs and LGRBs.

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Section: Discussionmentioning

confidence: 99%

Search for Quasiperiodic Oscillations in Precursors of Short and Long Gamma-Ray Bursts

Xiao

Peng²,

Zhang³

et al. 2022

ApJ

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“…Sotani et al 2007;Tews 2017;Zhang et al 2022), the duration of the precursors of SGRBs is just about ∼0.1 s (see Table .1), which means that only a few cycles of oscillations could possibly exist in a precursor, making the QPO search even more difficult. A definitive answer may come from sufficient statistics observed by more advanced detectors and higher detection signal to noise ratios, or a joined analysis using the light curves obtained by multiple GRB detectors, such as Fermi/GBM ), Insight-HXMT/HE (Zhang et al 2020;Liu et al 2020), Swift/BAT (Barthelmy et al 2005), and GECAM (Li et al 2021;Xiao et al 2022c). Especially for detectors with similar energy response will be more advantageous, such as GECAM and GBM (Xiao et al 2022d).…”

Section: Discussionmentioning

confidence: 99%

Search for Quasi-Periodical Oscillations in Precursors of Short and Long Gamma Ray Bursts

Xiao¹,

Peng²,

Zhang³

et al. 2022

Preprint

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The precursors of short and long Gamma Ray Bursts (SGRBs and LGRBs) can serve as probes of their progenitors, as well as shedding light on the physical processes of mergers or core-collapse supernovae. Some models predict the possible existence of Quasi-Periodically Oscillations (QPO) in the precursors of SGRBs. Although many previous studies have performed QPO search in the main emission of SGRBs and LGRBs, so far there was no systematic QPO search in their precursors. In this work, we perform a detailed QPO search in the precursors of SGRBs and LGRBs detected by Fermi/GBM from 2008 to 2019 using the power density spectrum (PDS) in frequency domain and Gaussian processes (GP) in time domain. We do not find any convinced QPO signal with significance above 3 σ, possibly due to the low fluxes of precursors. Finally, the PDS continuum properties of both the precursors and main emissions are also studied for the first time, and no significant difference is found in the distributions of the PDS slope for precursors and main emissions in both SGRBs and LGRBs.

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“…Since the launch on 2020 December 10, the GECAM mission (Xiong 2020) has observed hundreds of gamma-ray bursts (GRBs) including GRB 221009A (An et al 2023), the brightest of all time, and the second brightest, GRB 230307A (Xiong et al 2023), as well as X-ray bursts from magnetars such as SGR J1935+2154. Thanks to the excellent energy resolution (∼16% at 59.5 keV), antisaturation design at high count rates (< 4 × 10 5 counts per second) (Zhang et al 2019;Chen et al 2021;Li et al 2021) and the highest time resolution (0.1 μs) among all GRB satellites ever flown (Xiao et al 2022a), GECAM has advantages in energy spectral and timing analysis (Xiao et al 2022c), such as spectral lag (Xiao et al 2022d, minimum variable timescale , and quasiperiodic oscillation (QPO; , as well as time-delay localization for burst (Xiao et al 2021) and pulsar or magnetar navigation experiments (Luo et al 2023).…”

Section: Introductionmentioning

confidence: 99%

Calibration of the Timing Performance of GECAM-C

Xiao,

Liu,

Gong

et al. 2023

ApJS

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As a new member of the Gravitational-wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) after GECAM-A and GECAM-B, GECAM-C (originally called HEBS), which was launched on board the SATech-01 satellite on 2022 July 27, aims to monitor and localize X-ray and gamma-ray transients from ∼6 keV to 6 MeV. GECAM-C utilizes a similar design to GECAM but operates in a more complex orbital environment. In this work, we utilize the secondary particles simultaneously produced by the cosmic-ray events on orbit and recorded by multiple detectors to calibrate the relative timing accuracy between all detectors of GECAM-C. We find the result is 0.1 μs, which is the highest time resolution among all GRB detectors ever flown and very helpful in timing analyses such as minimum variable timescale and spectral lags, as well as in time delay localization. Besides this, we calibrate the absolute time accuracy using the one-year Crab Pulsar data observed by GECAM-C and Fermi’s Gamma-ray Burst Monitor, as well as GECAM-C and GECAM-B. The results are 2.02 ± 2.26 μs and 5.82 ± 3.59 μs, respectively. Finally, we investigate the spectral lag between the different energy bands of the Crab Pulsar observed by GECAM and the Gamma-ray Burst Monitor, which is ∼ −0.2 μs keV−1.

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Inflight performance of the GECAM Gamma-ray and Charge particle Detectors

Cited by 5 publications

References 0 publications

Search for Quasiperiodic Oscillations in Precursors of Short and Long Gamma-Ray Bursts

Search for Quasiperiodic Oscillations in Precursors of Short and Long Gamma-Ray Bursts

Search for Quasi-Periodical Oscillations in Precursors of Short and Long Gamma Ray Bursts

Calibration of the Timing Performance of GECAM-C

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