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Article Dans Une Revue Astrophys.J.Lett. Année : 2016

On the FERMI-GBM event seen 0.4 s after GW150914

J. Greiner
  • Fonction : Auteur
J.M. Burgess
  • Fonction : Auteur
H.-F. Yu
  • Fonction : Auteur

Résumé

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.

Dates et versions

hal-01554128 , version 1 (03-07-2017)

Identifiants

Citer

J. Greiner, J.M. Burgess, V. Savchenko, H.-F. Yu. On the FERMI-GBM event seen 0.4 s after GW150914. Astrophys.J.Lett., 2016, 827 (2), pp.L38. ⟨10.3847/2041-8205/827/2/L38⟩. ⟨hal-01554128⟩
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