ON THE FERMI-GBM EVENT 0.4 s AFTER GW150914

ABSTRACT In view of the recent report by Connaughton et al., we analyze continuous time-tagged event (TTE) data of Fermi-gamma-ray burst monitor (GBM) around the time of the gravitational-wave event GW 150914. We find that after proper accounting for low-count statistics, the GBM transient event at...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2016-08, Vol.827 (2), p.L38-L38
Main Authors: Greiner, J., Burgess, J. M., Savchenko, V., Yu, H.-F.
Format: Article
Language:English
Subjects:
ACCOUNTING
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Broadband
Bursting
COSMIC GAMMA BURSTS
DETECTION
DIAGRAMS
Fluctuation
FLUCTUATIONS
Fluence
GAMMA RADIATION
gamma-ray burst: general
GRAVITATIONAL WAVES
Integrals
methods: statistical
Monitors
SIMULATION
Statistics
VISIBLE RADIATION
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Summary:ABSTRACT In view of the recent report by Connaughton et al., we analyze continuous time-tagged event (TTE) data of Fermi-gamma-ray burst monitor (GBM) around the time of the gravitational-wave event GW 150914. We find that after proper accounting for low-count statistics, the GBM transient event at 0.4 s after GW 150914 is likely not due to an astrophysical source, but consistent with a background fluctuation, removing the tension between the INTEGRAL/ACS non-detection and GBM. Additionally, reanalysis of other short GRBs shows that without proper statistical modeling the fluence of faint events is over-predicted, as verified for some joint GBM-ACS detections of short GRBs. We detail the statistical procedure to correct these biases. As a result, faint short GRBs, verified by ACS detections, with significances in the broadband light curve even smaller than that of the GBM-GW150914 event are recovered as proper non-zero source, while the GBM-GW150914 event is consistent with zero fluence.
ISSN:2041-8205
2041-8213
2041-8213
DOI:10.3847/2041-8205/827/2/L38