http://arxiv.org/abs/1909.10002
In the context of time domain astronomy, we present an offline detection search of gamma-ray transients using a wild binary segmentation analysis called FWBSB 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 11 parameters present in the method using one week of archival data. We finally present our detection performance result for 60 days of a blind search analysis with FWBSB by comparing to both the on-board and offline GBM search as well as external events found by others surveys such as Swift-BAT. We detected 42/44 on-board GBM events but also other gamma-ray flares at a rate of 1 per hour below 50 keV. Our results show that FWBSB is capable of recovering gamma-ray flares, including the detection of soft X-ray long transients. It is particularly useful for increasing the rate of GRB detection and will help the joint detection with gravitational-wave events.
S. Antier, K. Barynova, P. Fryzlewicz, et. al.
Tue, 24 Sep 19
17/70
Comments: 15 pages, 5 figures
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