Vol 18, No 5

A low-latency pipeline for GRB light curve and spectrum using Fermi/GBM near real-time data

Yi Zhao, Bin-Bin Zhang, Shao-Lin Xiong, Xi Long, Qiang Zhang, Li-Ming Song, Jian-Chao Sun, Yuan-Hao Wang, Han-Cheng Li, Qing-Cui Bu, Min-Zi Feng, Zheng-Heng Li, Xing Wen, Bo-Bing Wu, Lai-Yu Zhang, Yong-Jie Zhang, Shuang-Nan Zhang, Jian-Xiong Shao


Abstract Rapid response and short time latency are very important for Time Domain Astronomy, such as the observations of Gamma-ray Bursts (GRBs) and electromagnetic (EM) counterparts of gravitational waves (GWs). Based on near real-time Fermi/GBM data, we developed a low-latency pipeline to automatically calculate the temporal and spectral properties of GRBs. With this pipeline, some important parameters can be obtained, such as T90 and fluence, within ∼ 20 min after the GRB trigger. For ∼ 90% of GRBs, T90 and fluence are consistent with the GBM catalog results within 2σ errors. This pipeline has been used by the Gamma-ray Bursts Polarimeter (POLAR) and the Insight Hard X-ray Modulation Telescope (Insight-HXMT) to follow up the bursts of interest. For GRB 170817A, the first EM counterpart of GW events detected by Fermi/GBM and INTEGRAL/SPI-ACS, the pipeline gave T 90 and spectral information 21 min after the GBM trigger, providing important information for POLAR and Insight-HXMT observations.


Keywords gamma-ray bursts: general — polarization — radiation mechanisms: non-thermal

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