GRBAlpha: The smallest astrophysical space observatory - I. Detector design, system description, and satellite operations

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Table 1

Self-synchronizing variable-length coding employed in the scientific data streams of GRBAlpha onboard units, and also found in the telemetry format.

Integer range	Bytes	Bit pattern	Overlong range
0…63	1	00xxxxxx	—
64… 2¹² − 1	2	010xxxxx 1xxxxxxx	0…63
2¹²…2¹⁸−1	3	0110xxxx 1xxxxxxx 1xxxxxxx	0…2¹² − 1, 0…63
2¹⁸…2²⁴−1	4	01110xxx 1xxxxxxx 1xxxxxxx 1xxxxxxx	0…2¹⁸−1,0…2¹²−1,0…63
2²⁴…2³⁰−l	5	011110xx 1xxxxxxx 1xxxxxxx 1xxxxxxx 1xxxxxxx	0…2²⁴−1,…,0…63
Unused code points	1+	011111xx […]	−

Notes. Up to 30-bit integers are currently supported, which also allows integers up to 24-bit length to be encoded in the overlong range. However, 2 bits of code point space are still available for arbitrary future extensions in order to ensure forward compatibility.

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