Suppose GW 170817 had happened at a distance of D = 180 Mpc, five times its actual distance. Q: Compute the number of photons in each bin integrated over the exposure (N), the uncertainty in that number (sig), and the percentage uncertainty (p = 100% * sig/N) small telescope (D = 1m) big telescope (D = 10m) N sig p N sig p ---------------------------------------------------------------------------- w = 100 Angstrom 240 15 6 24,000 155 0.6 w = 10 Angstrom 24 5 20 2,400 49 2.0 ----------------------------------------------------------------------------