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ON THE FERMI-GBM EVENT 0.4 s AFTER GW150914
Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Number of Authors: 4
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
2016. Vol. 827, no 2, L38
Keyword [en]
gamma-ray burst: general, gravitational waves, methods: statistical
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-135110DOI: 10.3847/2041-8205/827/2/L38ISI: 000383712100017OAI: oai:DiVA.org:su-135110DiVA: diva2:1046627
Available from: 2016-11-14 Created: 2016-10-31 Last updated: 2016-11-14Bibliographically approved

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