PDS_VERSION_ID                = PDS3                                          
/* label standards identifiers PDS Version 3.8 */                             
                                                                              
RECORD_TYPE                   = FIXED_LENGTH                                  
RECORD_BYTES                  = 221                                           
FILE_RECORDS                  = 46                                            
MD5_CHECKSUM                  = "a16b24d380f66fae2b37b209359e5738"            
^TABLE                        = "GRD-L1B-090217-090218_110225-DTS-NCR.TAB"    
PRODUCER_FULL_NAME            = "T. H. PRETTYMAN"                             
PRODUCER_INSTITUTION_NAME     = "PLANETARY SCIENCE INSTITUTE"                 
PRODUCT_CREATION_TIME         = 2011-02-25T06:09:06                           
PRODUCT_ID                    = "GRD-L1B-090217-090218_110225-DTS-NCR"        
PRODUCT_TYPE                  = "DATA"                                        
PRODUCT_VERSION_ID            = "1.0"                                         
START_TIME                    = 2009-02-17T22:33:04                           
STOP_TIME                     = 2009-02-18T00:44:19                           
SOFTWARE_NAME                 = "GRD_L1B_PIPELINE"                            
SOFTWARE_VERSION_ID           = "Version 1.0"                                 
MISSION_NAME                  = "DAWN MISSION TO VESTA AND CERES"             
MISSION_ID                    = "DAWN"                                        
INSTRUMENT_HOST_NAME          = "DAWN"                                        
INSTRUMENT_HOST_ID            = "DAWN"                                        
INSTRUMENT_ID                 = "GRAND"                                       
INSTRUMENT_NAME               = "GAMMA RAY AND NEUTRON DETECTOR"              
MISSION_PHASE_NAME            = "MARS GRAVITY ASSIST (MGA)"                   
TARGET_NAME                   = "MARS"                                        
TARGET_TYPE                   = "PLANET"                                      
DATA_SET_ID                   = "DAWN-M-GRAND-3-RDR-MARS-COUNTS-V1.0"         
DATA_SET_NAME = "DAWN GRAND CALIBRATED MARS FLYBY COUNTS V1.0"                
SPICE_FILE_NAME               = ("naif0009.tls",                              
                                 "DAWN_203_SCLKSCET.00014.tsc",               
                                 "dawn_rec_081109-090228_090306_v1.bsp",      
                                 "dawn_sc_090216_090222.bc",                  
                                 "de421.bsp",                                 
                                 "pck00008.tpc",                              
                                 "dawn_grand_v00.ti",                         
                                 "dawn_v08.tf")                               
                                                                              
OBJECT                        = TABLE                                         
 ROWS                         = 46                                            
 ROW_BYTES                    = 221                                           
 INTERCHANGE_FORMAT           = ASCII                                         
 COLUMNS                      = 21                                            
 ^STRUCTURE                   = "GRD_L1B-NCR.FMT"                             
 DESCRIPTION                  = "                                             
     This time series contains GRaND calibrated (level1b) data.  The time     
     series was constructed by averaging corrected counting rates over        
     a moving window using one of two methods: Central Moving Average (CMA)   
     or Decimated Time Series (DTS).  The CMA method provides an result       
     for each science data record by averaging over records on either side    
     of the current point as illustrated here:                                
                                                                              
     Science records       XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX                
                             ...                                              
                              | 1 |                                           
                               | 2 |                                          
                                | 3 |                                         
                                 | 4 |                                        
                                  | 5 |                                       
                                    ....                                      
     where each of the time-ordered science records is indicated by an        
     X and the window boundaries are indicated by the vertical bars.          
     The middle of each time series is labeled with an index (1, 2, ...).     
                                                                              
     The DTS method marches the window through the science data records,      
     resulting in a decimated time series as follows:                         
                                                                              
     Science records       XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX                
                           ...| 1 || 2 || 3 || 4 || 5 |...                    
                                                                              
     The number of science data records averaged for each point in the time   
     series is given by WINDOW_WIDTH, which is an odd integer.  For both      
     methods, all time, ephemeris, and pointing information is determined at  
     the midpoint of the window.                                              
                                                                              
     The time series parameters for this data set are given here:             
                                                                              
     SERIES_TYPE  = 1 Decimated Time Series (DTS)                             
     WINDOW_WIDTH = 5                                                         
     TELREADOUT   = 35                                                        
     TRUE_TIME    = 175                                                       
                                                                              
     This file contains a time series of thermal, epithermal, and fast        
     neutron counting rates determined from reduced CAT1, CAT2, and CAT4      
     (neutron event buffer) data.                                             
                                                                              
     The CAT1 counting data acquired by the +Z phoswich is sensitive to       
     neutrons originating from Mars around Mars Closest Approach.  Because    
     the +Z phoswich is shielded by Gd and Li-loaded-glass, the CAT1 counting 
     rate for the 93 keVeq peak from the 10B(n,alpha) reaction is sensitive   
     to neutrons in the epithermal energy range (between 0.3 eV and 0.7 MeV). 
     The CAT1 counting rate for the 6Li(n,t)peak is sensitive to thermal      
     (<0.3 eV) and epithermal neutrons.                                       
                                                                              
     CAT2 coincidence counting rates were determined for all of the           
     boron-loaded-plastic (BLP) scintillators. Net areas were determined for  
     the 478 keV peak that appears in the BGO CAT2 spectrum, resulting from   
     neutrons undergoing 10B(n,alpha) in each of the BLP scintillators.  Since
     they are shielded by Gd and Li-glass, the -Z and +Z scintillators are    
     primarily sensitive to epithermal neutrons (between 0.3 eV and 0.7 MeV). 
     Because they are unshielded, their the -Y and +Y are sensitive to        
     thermal and epithermal neutrons.                                         
                                                                              
     Fast neutron counting rate were determined for all of the BLP            
     scintillators by analyzing the CAT4 event and scaler counting data. The  
     counting rates are sensitive to neutrons with energies greater than      
     0.7 MeV.                                                                 
                                                                              
 "                                                                            
END_OBJECT                    = TABLE                                         
END