bug fixed

observation_sim/sim_steps/add_pattern_noise.py

@@ -22,7 +22,7 @@ def add_poisson_and_dark(self, chip, filt, tel, pointing, catalog, obs_param):
     if obs_param["add_dark"] is True:
         chip.img, _ = chip_utils.add_poisson(img=chip.img,
                                              chip=chip,
-                                             exptime=pointing.exp_time,
+                                             exptime=exptime,
                                              poisson_noise=chip.poisson_noise,
                                              InputDark=None)
     else: