Fixed off-by-one in detid2xy

Author: dmopalmer

setup.py

@@ -35,7 +35,7 @@
 
 setup(
     name='swiftbat',
-    version='0.1.2a1',
+    version='0.1.2a3',
     packages=['swiftbat'],
     package_data={'':['catalog', 'recent_bcttb.fits.gz']},
     url='https://github.com/lanl/swiftbat_python/',

swiftbat/swinfo.py

@@ -416,8 +416,8 @@ def detid2xy(detids):
     # and blocks 8-15 are rotated 180 degrees
     bit15, bit14_11 = np.divmod(block, np.int16(8))
     #                      8-15        0-7
-    y = np.where(bit15, np.int16(85) - jblock, np.int16(88) + jblock)
-    x = np.where(bit15, np.int16(34) - iblock, iblock) + np.int16(36) * bit14_11
+    y = np.where(bit15, np.int16(85) - jblock - 1, np.int16(88) + jblock)
+    x = np.where(bit15, np.int16(34) - iblock - 1, iblock) + np.int16(36) * bit14_11
     if scalar:
         x = np.int16(x)
         y = np.int16(y)