diff --git a/observation_sim/instruments/chip/effects.py b/observation_sim/instruments/chip/effects.py
index 7a6b7a667c15e5ff8bf5d740e63476cd597531d0..21735ede4ef8e5307fc645d75c4592b9e0c0e2d5 100644
--- a/observation_sim/instruments/chip/effects.py
+++ b/observation_sim/instruments/chip/effects.py
@@ -793,7 +793,7 @@ def ShutterEffectArr(GSImage, t_exp=150, t_shutter=1.3, dist_bearing=735, dt=1E-
     sizey = ymax-ymin+1
     xnewgrid = np.mgrid[xmin:(xmin+sizex)]
     expeffect = interpolate.splev(xnewgrid, intp, der=0)
-    expeffect /= np.max(expeffect)
+    expeffect /= t_exp
     exparrnormal = np.tile(expeffect, (sizey,1))
     # GSImage *= exparrnormal
 
diff --git a/observation_sim/sim_steps/readout_output.py b/observation_sim/sim_steps/readout_output.py
index 8ef872fd6d9348f3f46491486010fa41af935c6f..c2cb8a16ab8054a55ad7456fa01987e5d42a8d34 100644
--- a/observation_sim/sim_steps/readout_output.py
+++ b/observation_sim/sim_steps/readout_output.py
@@ -86,10 +86,10 @@ def quantization_and_output(self, chip, filt, tel, pointing, catalog, obs_param)
     fname = os.path.join(self.chip_output.subdir,
                          self.h_prim['FILENAME'] + '.fits')
 
-    f_name_size = 68
-    if (len(self.h_prim['FILENAME']) > f_name_size):
-        self.updateHeaderInfo(header_flag='prim', keys=['FILENAME'], values=[
-                              self.h_prim['FILENAME'][0:f_name_size]])
+    # f_name_size = 68
+    # if (len(self.h_prim['FILENAME']) > f_name_size):
+    #     self.updateHeaderInfo(header_flag='prim', keys=['FILENAME'], values=[
+    #                           self.h_prim['FILENAME'][0:f_name_size]])
 
     hdu1 = fits.PrimaryHDU(header=self.h_prim)
 
diff --git a/tools/get_pointing.py b/tools/get_pointing.py
index 073d160b59321ede75351dd8c850f3a1022be287..39216a16c7c2ed7c9cb7481a799c7211288e07aa 100755
--- a/tools/get_pointing.py
+++ b/tools/get_pointing.py
@@ -63,10 +63,15 @@ class Chip(object):
             ycen = self.cen_pix_y
         if pix_scale == None:
             pix_scale = self.pix_scale
-        dudx =  -np.cos(img_rot.rad) * pix_scale
-        dudy =  -np.sin(img_rot.rad) * pix_scale
-        dvdx =  -np.sin(img_rot.rad) * pix_scale
-        dvdy =  +np.cos(img_rot.rad) * pix_scale
+        # dudx =  -np.cos(img_rot.rad) * pix_scale
+        # dudy =  -np.sin(img_rot.rad) * pix_scale
+        # dvdx =  -np.sin(img_rot.rad) * pix_scale
+        # dvdy =  +np.cos(img_rot.rad) * pix_scale
+
+        dudx = -np.cos(img_rot.rad) * pix_scale
+        dudy = +np.sin(img_rot.rad) * pix_scale
+        dvdx = -np.sin(img_rot.rad) * pix_scale
+        dvdy = -np.cos(img_rot.rad) * pix_scale
         
         # dudx =  +np.sin(img_rot.rad) * pix_scale
         # dudy =  +np.cos(img_rot.rad) * pix_scale
@@ -139,12 +144,11 @@ def getobsPA(ra, dec):
     angle = math.acos(np.dot(l1l2cross,pdl2cross)/(np.linalg.norm(l1l2cross)*np.linalg.norm(pdl2cross)))
 
     angle = (angle)/math.pi*180
-
-    # if (ra>90 and ra< 270):
-    #     angle=-angle
+    angle = angle + 90
+    if (ra<90 or ra> 270):
+        angle=-angle
     return angle
 
-
 # @jit()
 def getSelectPointingList(center = [60,-40], radius = 2):
     points = np.loadtxt('sky.dat')
@@ -261,7 +265,7 @@ def findPointingbyChipID(chipID = 8, ra = 60., dec = -40.):
 
 
 if __name__ == "__main__":
-    tchip, tra, tdec = 8, 60., -40.
+    tchip, tra, tdec = 13, 60., -40.
     pointing = findPointingbyChipID(chipID=tchip, ra=tra, dec=tdec)
     print("[ra_center, dec_center, image_rot]: ", pointing)
 
diff --git a/tools/target_location_check.py b/tools/target_location_check.py
index 34293be892b00d330c8fac94037a3502e2b6055e..11f22bac7e8eb8d74606c4e5d003ac92e5e23633 100644
--- a/tools/target_location_check.py
+++ b/tools/target_location_check.py
@@ -119,10 +119,15 @@ def getTanWCS(ra, dec, img_rot, pix_scale=0.074):
     """
     xcen, ycen = 0, 0
     img_rot = img_rot * galsim.degrees
+    # dudx = -np.cos(img_rot.rad) * pix_scale
+    # dudy = -np.sin(img_rot.rad) * pix_scale
+    # dvdx = -np.sin(img_rot.rad) * pix_scale
+    # dvdy = +np.cos(img_rot.rad) * pix_scale
+
     dudx = -np.cos(img_rot.rad) * pix_scale
-    dudy = -np.sin(img_rot.rad) * pix_scale
+    dudy = +np.sin(img_rot.rad) * pix_scale
     dvdx = -np.sin(img_rot.rad) * pix_scale
-    dvdy = +np.cos(img_rot.rad) * pix_scale
+    dvdy = -np.cos(img_rot.rad) * pix_scale
 
     moscen = galsim.PositionD(x=xcen, y=ycen)
     sky_center = galsim.CelestialCoord(