Profile Data

Profile data are an array of the raw gamma events continuously binned at high time resolution and limited energy resolution. The array length, settable up to 2048 elements, covers the duration of the current pixel. Each element contains four scalars which represent the counts above the Lower Level Discriminator (LLD), between LLD and L1, between L1 and L2, and between L2 and L3. The parameters LLD, L1, L2, and L3 are all settable parameters. These data are sent from the CEB when a burst is detected. At the time of detection the current pixel's profile data along with addition pixel sets are packaged for downlink. The total number of additional sets is a settable parameter and is currently set to 2. The data values are sets of 4 values representing the number of events seen in between the discriminator levels (LLD, L1, L2, L3, ULD) within a settable period (def. 32 ms) over the pixel. This is also referred to as small burst data.

Column Descriptions
Column Name Type Bytes Units
SC_RECV_TIME MSB_UNSIGNED_INTEGER 8
The time this packet was received by the spacecraft, in ticks (256 per second).
SC_EV_TIME MSB_UNSIGNED_INTEGER 8
Spacecraft time at the beginning of the pixel, in ticks (256 per second).
SC_EV_TIME_FINE MSB_UNSIGNED_INTEGER 2
Fine time portion of spacecraft time at the beginning of the pixel, units of 65536ths of a second.
CEB_TIME MSB_UNSIGNED_INTEGER 8 MILLISECOND
Clock count from the GRS Common Electronics Box at the beginning of the pixel.
UTC CHARACTER 23
SC_EV_TIME converted to UTC, stored as yyyy-mm-ddThh:mm:ss.sss.
GRS_PIXEL_NUMBER MSB_UNSIGNED_INTEGER 4
Sequential counter of accumulation intervals, starts with one as grs orbit begins. Special case on reboot when the the CEB is in orbit 0, pixel 0.
GRS_ORBIT_NUMBER MSB_UNSIGNED_INTEGER 4
Sequential counter of orbits from GRS CEB boot.
ODY_ORBIT_NUMBER MSB_UNSIGNED_INTEGER 4
Orbit number common to all instruments aboard Odyssey. This orbit number is incremented by one as the spacecraft passes through the orbital descending node.
BAD_CODE MSB_UNSIGNED_INTEGER 4
If non-zero, the data has been flagged bad. Definitions in bad_code.txt.
COUNTER MSB_UNSIGNED_INTEGER 4
A profile can come down in up to 4 packets. Each packet has its own counter. This counter is the combination of all eight possible counters, four bits for each.
PROFILE_COUNT MSB_UNSIGNED_INTEGER 2
Number of 4-scalar element sets that are in the profile array.
PROFILE_SERIES 16
Series of summed counts of gamma events in four energy ranges. The nominal summing period is 32 milliseconds.