  Mergers of compact objects are considered prime sources of gravitational
waves (GW) and will soon be targets of GW observatories such as the
Advanced-LIGO, VIRGO etc. Finding electromagnetic counterparts of these GW
sources will be important to understand their nature. We discuss possible
electromagnetic signatures of the mergers. We show that the BH-BH mergers could
have luminosities which exceed Eddington luminosity from unity to several
orders of magnitude depending on the masses of the merging BHs. As a result
these mergers could be explosive, release up to $10^{51}$ erg of energy and
shine as radio transients. At any given time we expect about a few such
transients in the sky at GHz frequencies which could be detected out to about
300 Mpc. It has also been argued that these radio transients would look alike
radio supernovae with comparable detection rates. Multi-band follow up could,
however, distinguish between the mergers and supernovae.
