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ON THE FERMI-GBM EV...
ON THE FERMI-GBM EVENT 0.4 s AFTER GW150914
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Greiner, J. (författare)
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- Burgess, J. Michael (författare)
- KTH,Partikel- och astropartikelfysik,Oskar Klein Centre for Cosmoparticle Physics, Sweden
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Savchenko, V. (författare)
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Yu, H. -F (författare)
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(creator_code:org_t)
- Institute of Physics Publishing (IOPP), 2016
- 2016
- Engelska.
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Ingår i: Astrophysical Journal Letters. - : Institute of Physics Publishing (IOPP). - 2041-8205 .- 2041-8213. ; 827:2
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- gamma-ray burst: general
- gravitational waves
- methods: statistical
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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