Possible role of magnetic reconnection in the electromagnetic
  counterpart of binary black hole merger
  We propose a qualitative scenario to interpret the argued association between
the direct measurement of the gravitational wave event GW150914 by Laser
Interferometer Gravitational Wave Observatory (LIGO)-Virgo collaborations and
the hard $X$-ray transient detected by Fermi-Gamma-ray Burst Monitor (GBM)
$0.4$ sec after. In a binary system of two gravitationally collapsing objects
with a non-vanishing electric charge, the compenetration of the two
magnetospheres occurring during the coalescence, through magnetic reconnection,
produces a highly collimated relativistic outflow that becomes optically thin
and shines in the GBM field of view. We propose that this process should be
expected as a commonplace in the future joint gravitational/electromagnetic
detections and, in case of neutron star-neutron star merger event, might lead
to detectable $X$- or $\gamma$-ray precursors to, or transients associated
with, the gravitational bursts.
