Geographic and seasonal influences on optical followup of gravitational   wave events
  We investigate the effects of observatory locations on the probability of discovering optical/infrared counterparts of gravitational wave sources. We show that for the LIGO--Virgo network, the odds of discovering optical/infrared (OIR) counterparts show some latitude dependence, but weak or no longitudinal dependence. A stronger effect is seen to arise from the timing of LIGO/Virgo observing runs, with northern OIR observatories having better chances of finding the counterparts in northern winters. Assuming identical technical capabilities, the tentative mid-2017 three-detector network observing favors southern OIR observatories for discovery of EM counterparts. 
Varun Srivastava (1), Varun Bhalerao (2), Aravind P. Ravi (3 and 4),   Archisman Ghosh (4 and 5), Sukanta Bose (2 and 6), ((...
astro-ph.HE astro-ph.IM