urn:nasa:pds:lro-crater:data-raw-sec:crat_l0_sec_2026081 1.0 1.18.0.0 Product_Observational Spence, Harlan E. 2025 Lunar Reconnaissance Orbiter LRO Cosmic Ray Telescope for the Effects of Radiation CRaTER Raw (Level 0) secondary science data from CRaTER for year 2026 day 081 (2026-03-22). These data have been reformatted from the PDS3 data file CRAT_L0_SEC_2026081_V02.LBL during the process of migrating to PDS4. Bit fields in the original file have been converted to integer values. Field values should be unchanged. 2026-06-14 1.0 This product, CRAT_L0_SEC_2026081_V02.xml, is a reformatted version of the product CRAT_L0_SEC_2026081_V02.LBL, which was originally released as part of the PDS3 EDR dataset. The data values are unchanged. This version of the data and metadata are the first version to be migrated to PDS4 so it carries a PDS4 version_id of 1.0. Instrument Serial Number: 2 2026-03-22T00:00:00.84Z 2026-03-22T23:59:59.84Z Science Raw Magnetosphere Heliosphere Particles Ions Cosmic Ray LRO Mission urn:nasa:pds:context:investigation:mission.lunar_reconnaissance_orbiter data_to_investigation CRaTER Instrument urn:nasa:pds:context:instrument:lro.crat is_instrument LRO Host urn:nasa:pds:context:instrument_host:spacecraft.lro is_instrument_host Moon Satellite urn:nasa:pds:context:target:satellite.earth.moon data_to_target SIXTH EXTENDED SCIENCE MISSION 0795830400.81 0795916799.81 1 Ions Counts urn:nasa:pds:lro-crater:data-raw-pri:crat_l0_pri_2026081::1.0 data_to_raw_product urn:nasa:pds:lro-crater:data-raw-hk:crat_l0_hk_2026081::1.0 data_to_raw_product The referenced product contains instrument engineering data associated with this product. urn:nasa:pds:lro-crater:document:data-raw-sec-desc data_to_document LRO-L-CRAT-2-EDR-RAWDATA-V1.0:CRAT_L0_SEC_2026081_V02:CRAT_L0_SEC_2026081_V02.DAT data_to_raw_source_product 10.17189/1519728 NASA Planetary Data System This is the first version of this product converted to PDS4. The DOI provided references the PDS3 source data set. CRAT_L0_SEC_2026081_V02.DAT 2026-03-23T19:54:44.000Z 5356818 2bd10cc4e05dd99424b7b6c8c213b333 This data file has been reformatted from the PDS3 version. Header Record 0 1 Header for data file, consisting of 1 record. The first three bytes are spare and not described by a Field_Binary object. 6 0 18 FileID 1 4 UnsignedByte 1 File Identifier (primary science = 200, housekeeping = 201, secondary science = 202). 202 200 Reserved 2 5 UnsignedMSB4 4 Spare. StartTimeSec 3 9 UnsignedMSB4 4 s Spacecraft Time of First Packet in File (elapsed seconds from epoch 2001-01-01T00:00:00.000 UTC) 2147483647 0 StartTimeSubsec 4 13 UnsignedByte 1 Counts Spacecraft Time of First Packet in File--Fractional Seconds. (Use only the 4 most significant bits (MSB) to compute an unsigned integer corresponding to the number of 1/16th second increments. The 4 remaining bits are undefined.) 255 0 StopTimeSec 5 14 UnsignedMSB4 4 s Spacecraft Time of Last Packet in File (elapsed seconds from epoch 2001-01-01T00:00:00.000 UTC). 2147483647 0 StopTimeSubsec 6 18 UnsignedByte 1 Counts Spacecraft Time of Last Packet in File--Fractional Seconds. (Use only the 4 most significant bits (MSB) to compute an unsigned integer corresponding to the number of 1/16th second increments. The 4 remaining bits are undefined.) 255 0 Data Table 18 46 Table containing the measured data. 24 3 62 Version 1 1 UnsignedByte 1 Part of CCSDS Primary and Secondary Headers, ApID = 121. PacketType 2 2 UnsignedByte 1 Packet Type. Part of CCSDS Primary and Secondary Headers, ApID = 121. SecHdrFlag 3 3 UnsignedByte 1 Secondary Header Flag (1 = secondary header follows). Part of CCSDS Primary and Secondary Headers, ApID = 121. APID 4 4 UnsignedMSB2 2 Application Process ID (120 = primary science; 121 = secondary science; 122 = housekeeping). Part of CCSDS Primary and Secondary Headers, ApID = 121. 65535 0 SegFlags 5 6 UnsignedByte 1 Packet Segmentation Flag (3 = no segmentation). Part of CCSDS Primary and Secondary Headers, ApID = 121. SeqCount 6 7 UnsignedMSB2 2 Sources Sequence Count (separate for each ApId). Part of CCSDS Primary and Secondary Headers, ApID = 121. 65535 0 PacketLength 7 9 UnsignedMSB2 2 Packet Length (number of bytes following primary header - 1). Part of CCSDS Primary and Secondary Headers, ApID = 121. This is the original CCSDS packet length, not the reformatted record length. 65535 0 Time 8 11 UnsignedMSB4 4 s Spacecraft Time (elapsed seconds from epoch 2001-01-01T00:00:00.000 UTC). Part of CCSDS Primary and Secondary Headers, ApID = 121. 4294967295 0 FracTime 9 15 UnsignedByte 1 Counts Spacecraft Time--Fractional Seconds (number of 1/16 sec increments). Part of CCSDS Primary and Secondary Headers, ApID = 121. 255 0 TestFlag 10 16 UnsignedByte 1 Test Mode Flag (1 = test enabled). Part of CCSDS Primary and Secondary Headers, ApID = 121. 255 0 OneHertz 11 17 UnsignedByte 1 External 1-Hz Time Sync Pulse Flag (1 = not received). Part of CCSDS Primary and Secondary Headers, ApID = 121. 255 0 SerialNumber 12 18 UnsignedByte 1 Instrument Serial Number. Part of CCSDS Primary and Secondary Headers, ApID = 121. 255 0 BiasCntrl 13 19 UnsignedByte 1 Detector Bias Delayed Control Flag (1 = enabled). A secondary science flag. 255 0 BiasCmd 14 20 UnsignedByte 1 Detector Bias Voltage Flag (1 = on). A secondary science flag. 255 0 CAllow 15 21 UnsignedByte 1 Internal Calibration Pulser--Low Range Flag (1 = enabled). A secondary science flag. 255 0 CalHigh 16 22 UnsignedByte 1 Internal Calibration Pulser--High Range Flag (1 = enabled). A secondary science flag. 255 0 CalRate 17 23 UnsignedByte 1 Internal Calibration Pulser Pulse Rate Flag (0 = 8 Hz; 1 = 1953 Hz). A secondary science flag. 255 0 ProcdFlags 6 1 0 Internal Calibration Pulser Pulse Rate Flags 1 through 6 (0 = 8 Hz; 1 = 1953 Hz). These are secondary science flags. 24 6 ProcdFlag 1 1 UnsignedByte 1 Internal Calibration Pulser Pulse Rate Flag (0 = 8 Hz; 1 = 1953 Hz). A secondary science flag. 255 0 LastCmd 24 30 UnsignedByte 1 Address of Last Command to CRaTER. 255 0 LastValue 25 31 UnsignedMSB2 2 Contents of Last Command to CRaTER. 65535 0 DiscThin 26 33 UnsignedMSB2 2 LLD Monitor Value--Thin Detectors (D1, D3, D5). (DN-Min = 0, DN-Max = 65535) 65535 0 DiscThick 27 35 UnsignedMSB2 2 LLD Monitor Value--Thick Detectors (D2, D4, D6). 65535 0 Masks 2 1 0 Detector Coincidence Discriminator Accept Mask (64 bits) -- two fields containing two bytes each. 37 8 Mask 1 1 UnsignedMSB4 4 Detector Coincidence Discriminator Accept Mask. 4294967295 0 Singles 6 1 0 Singles counters for detectors D1-D6. 45 12 Single 1 1 UnsignedMSB2 2 Singles counter for one detector. 65535 0 Good 36 57 UnsignedMSB2 2 Good Events Counter. 65535 0 Reject 37 59 UnsignedMSB2 2 Rejected Events Counter. 65535 0 Total 38 61 UnsignedMSB2 2 Total Events Counter. 65535 0