"GBM Repoint" (APP/LPA)

ITOS Mnemonic:  LPAGBMCREPRECOM

View Options: (help)

Focus:	Maintenance / Operation
Structures:	Abstract / Concrete

Context:

Description:

The Candidate Repoint Recommendation telecommand is sent once per burst trigger.

Layout:  (hide detail; help)

GBM Repoint (GbmRpt) Telecommand Packet Format
0x	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15
000	Version=0			T=1	SH	APID=0x660:2
002	SF=3		Sequence Count
004	Packet Length=25
006	0	Function Code=2
008	TRGID_TSEC tsec
00C	TRGID_USEC usec
00E	LR_SEQ seq								LR_VER ver
010	LPASPARE8 pad								RPT_REC rec
012	LOC_RA ra
014	LOC_DEC dec
016	TOT_ERR err
018	LOC_ALG lalg
01A	EVT_CLASS class0								EVT_CLASS class1
01C	EVT_CLASS class2								EVT_CLASS class3
01E	Packet Checksum

GbmRpt (pkt)
|  TRGID_TSEC tsec (fld)
|  TRGID_USEC usec (fld)
|  LR_SEQ seq (fld)
|  LR_VER ver (fld)
|  LPASPARE8 pad (fld)
|  RPT_REC rec (fld)
|  LOC_RA ra (fld)
|  LOC_DEC dec (fld)
|  TOT_ERR err (fld)
|  LOC_ALG lalg (fld)
|  EVT_CLASS class0 (fld) ... class3 (fld)

typedef struct _LPA_GbmRpt_Pkt {

    /* CCSDS header */
    char                 hdr[8];

    /* Command payload */
    LPA_GbmRpt_Prm       pay;

} LPA_GbmRpt_Pkt;

Fields:

EVT_CLASS (index)

Attribute(s):  

Brief:  "GRB Event Class"

Instance(s):  class0, class1, class2, class3

Byte 0: Most likely Event Type (enum?) Byte 1: 2nd Most likely Event Type Byte 2: Most likely Event Probability (0 255) Byte 3: 2nd Most likely Event s Probability (0 255) RELIABILITY Deleted: Classification and reliability of classification

LOC_ALG (index)

Attribute(s):  

Brief:  "GRB Location Algorithm"

Instance(s):  lalg

GRB location algorithm used.

LOC_DEC (index)

Attribute(s):  

Brief:  "GRB Declination"

Instance(s):  dec

GRB calculated declination in arcmin

LOC_RA (index)

Attribute(s):  

Brief:  "GRB Right Ascension"

Instance(s):  ra

GRB calculated right ascension location in arcmin

LPASPARE8 (index)

Attribute(s):  

Brief:  "Spare 8 Bits"

Instance(s):  pad

LR_SEQ (index)

Attribute(s):  

Brief:  "GRB LAT Record Sequence Number"

Instance(s):  seq

Record number (1 relative) with respect to the specified TRIGGER ID burst.

LR_VER (index)

Attribute(s):  

Brief:  "GRB Record Type Version"

Instance(s):  ver

Record Type Version Number

RPT_REC (index)

Attribute(s):  

Brief:  "GBM Repornt Recommendation"

Instance(s):  rec

0 = Do Not Recommend Repoint 1 = Recommend Repoint

TOT_ERR (index)

Attribute(s):  

Brief:  "GRB Total Error"

Instance(s):  err

GRB error on location in arcmin

TRGID_TSEC (index)

Attribute(s):  

Brief:  "GRB Trigger ID"

Instance(s):  tsec

Tenths of a second

TRGID_USEC (index)

Attribute(s):  

Brief:  "GBM Trigger ID"

Instance(s):  usec

Microseconds.