Constraining bright optical counterparts of fast radio bursts

Fast Radio Bursts (FRBs) are extremely energetic pulses of millisecond duration and unknown origin. In order to understand the phenomenon that emits these pulses, targeted untargeted searches have been performed for multi-wavelength counterparts, including optical. The objective this work is search optical transients at position 8 well-localized FRBs, after arrival burst on different time-scales (typically one day, several months, year FRB detection) in compare with known transient light curves. We used Las Cumbres Observatory Global Telescope Network (LCOGT), which allows us promptly take images owing its network twenty-three telescopes working around world. a template subtraction technique all we collected epochs. divided subtractions into two groups, group use image last epoch as other first template. searched bright localizations FRBs (<1 arcsec) subtracted images. found no transients, so set limiting magnitudes counterparts. Typical apparent (absolute) our LCOGT data ~22 (-19) mag r-band. compared curves superluminous supernovae (SLSNe), type Ia (SNe), associated gamma-ray bursts (GRB SNe), kilonova, tidal disruption events (TDEs). rule out SLSN confidence ~99.9%. can also brightest sub-types SNe, GRB SNe TDEs (under some conditions) similar confidence, though cannot exclude scenarios where faintest sub-type each classes.