Abstract
Recently, the direct detection of gravitational waves from black hole (BH)
mergers was announced by the Advanced LIGO Collaboration. Multi-messenger
counterparts of stellar-mass BH mergers are of interest, and it had been
suggested that a small disk or celestial body may be involved in the binary of
two BHs. To test such possibilities, we consider the fate of a wind powered by
an active mini-disk in a short accretion episode onto a BH with \~10-100 solar
masses. We show that, while the detections of counterparts may be currently
challenging, its thermal emission could be seen as a fast optical transient
with the duration of hours. We also find that the coasting outflow forms
external shocks due to interaction with the interstellar medium, whose
synchrotron emission might be expected in the radio band on a time scale of
years. Finally, we also discuss a possible jet component and the associated
high-energy emission.
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