http://arxiv.org/pdf/1606.00314v1.pdf ON THE GBM EVENT SEEN 0.4 SEC AFTER GW 150914: ABSTRACT In view of the recent report by Connaughton et al. (2016, arXiv:1602.03920.v3) we analyse continuous TTE data of Fermi-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 broad-band 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.
So, just noise. The authors of this article actually are part of the Fermi GBM team. The original paper...... http://arxiv.org/pdf/1602.03920v5.pdf Fermi GBM Observations of LIGO Gravitational Wave Event GW150914
