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ON THE FERMI-GBM EVENT 0.4 s AFTER GW150914
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Oskar Klein Centre for Cosmoparticle Physics, Sweden.ORCID iD: 0000-0003-3345-9515
2016 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 827, no 2, L38Article in journal (Refereed) Published
Abstract [en]

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 GW150914. We find that after proper accounting for low-count statistics, the GBM transient event at 0.4 s after GW150914 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.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2016. Vol. 827, no 2, L38
Keyword [en]
gamma-ray burst: general, gravitational waves, methods: statistical
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-194011DOI: 10.3847/2041-8205/827/2/L38ISI: 000383712100017ScopusID: 2-s2.0-84984680221OAI: oai:DiVA.org:kth-194011DiVA: diva2:1038684
Note

QC 20161019

Available from: 2016-10-19 Created: 2016-10-14 Last updated: 2016-10-19Bibliographically approved

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