Gravity Collective: counterpart to GrW190814

Using the joint limits from our follow-up imaging, we conclude that a counterpart with an r-band decline rate of 0.68mag/day, similar to the kilonova AT 2017gfo, could peak at an absolute magnitude of at most -17.8mag (50% confidence). Our data are not constraining for "red" kilonovae and rule out "blue" kilonovae with M>0.5M_{sun}_ (30% confidence). We strongly rule out all known types of short gamma-ray burst afterglows with viewing angles <17{deg} assuming an initial jet opening angle of ~5.2 and explosion energies and circumburst densities similar to afterglows explored in the literature.

Finally, we explore the possibility that GW190814 merged in the disk of an active galactic nucleus, of which we find four in the localization region, but we do not find any candidate counterparts among these sources.