Merge pull request #1700 from pypeit/fors2_mos

Add support for VLT/FORS2 MOS mode
pypeit · Oct 17, 2023 · 2b3a8d1 · 2b3a8d1
2 parents e999155 + faf99d7
commit 2b3a8d1
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diff --git a/doc/releases/1.14.1dev.rst b/doc/releases/1.14.1dev.rst
@@ -14,13 +14,14 @@ Functionality/Performance Improvements and Additions
   release, we only model KCWI/KCRM scattered light.
 - Turned on usage of the use_2dmodel_mask parameter for echelle spectrographs
 - Added support for Keck/KCRM RL data reduction.
-- Allow one to turn off reinit of reduce_bpm in global_skysub and made this 
+- Allow one to turn off reinit of reduce_bpm in global_skysub and made this
   the default for the final pass
 
 Instrument-specific Updates
 ---------------------------
 
 - Keck/KCWI and Keck/KCRM: Turned on polynomial correction for sky subtraction.
+- We now support the reduction of VLT/FORS2 data taken in MOS mode.
 
 Script Changes
 --------------

diff --git a/pypeit/spectrographs/vlt_fors.py b/pypeit/spectrographs/vlt_fors.py
@@ -121,14 +121,22 @@ def compound_meta(self, headarr, meta_key):
             binning = parse.binning2string(binspec, binspatial)
             return binning
         elif meta_key == 'decker':
-            try:  # Science
-                decker = headarr[0]['HIERARCH ESO INS SLIT NAME']
-            except KeyError:  # Standard!
-                try:
-                    decker = headarr[0]['HIERARCH ESO SEQ SPEC TARG']
-                except KeyError:
-                    return None
-            return decker
+            mode = headarr[0]['HIERARCH ESO INS MODE']
+            if mode == 'LSS':
+                try:  # Science
+                    return headarr[0]['HIERARCH ESO INS SLIT NAME']
+                except KeyError:  # Standard!
+                    try:
+                        return headarr[0]['HIERARCH ESO SEQ SPEC TARG']
+                    except KeyError:
+                        return None
+            elif mode == 'MOS':
+                return headarr[0]['HIERARCH ESO INS MOS CHECKSUM']
+            elif mode == 'IMG':
+                # This is for the bias frames
+                return None
+            else:
+                msgs.error(f"PypeIt does not currently support VLT/FORS2 '{mode}' data reduction.")
         else:
             msgs.error("Not ready for this compound meta")
 
@@ -207,7 +215,7 @@ class VLTFORS2Spectrograph(VLTFORSSpectrograph):
     camera = 'FORS2'
     header_name = 'FORS2'
     supported = True
-    comment = '300I, 300V gratings'
+    comment = '300I, 300V gratings. Supports LSS and MOS mode only.'
 
     def get_detector_par(self, det, hdu=None):
         """
@@ -354,7 +362,7 @@ def config_independent_frames(self):
             keywords that can be used to assign the frames to a configuration
             group.
         """
-        return {'bias': 'detector', 'dark': 'detector'}
+        return {'bias': 'detector', 'dark': 'detector', 'standard':['detector', 'dispangle', 'dispname']}
 
     def configuration_keys(self):
         """