IRAS Explanatory Supplement
X. The Formats of the IRAS Catalogs and Atlases
B. Point Sources
B.7 Bit Assignments
Table of Contents | Index | Previous Section | Next Section
| Bit # | Meaning |
|---|---|
| 0-3 | Bits 0-3 denote a flux limit derived solely from saturated detections. Bit 0=12 µm, Bit 1=25 µm. |
| 4 | Source failed to weeks-confirm with another WSDB source in the mini-survey region. |
| 5 | Source resulted from weeks-confirming at least two WSDB sources in the mini-survey region. |
| 6 | Source failed to weeks-confirm with another WSDB entry observed within 36 hours. |
| 7 | Source resulted from weeks-confirmation of two separate WSDB sources observed within 36 hours of each other. |
Table X.B.7b.
Bit # Meaning
0 false source generated by nearby
bright source
l-4 Source satisfies single band acceptance criteria
BIT 1 = 12 µm, Bit 2=25 µm, etc.
5-7 Source satisfies adjacent band acceptance criteria
BIT 5 = 12 and 25 µm
BIT 6 = 25 and 60 µm
BIT 7 = 60 and 100 µm
Table X.B.7c.
Bit # Meaning
Byte 1
0 and 1 00=0---not processed
01=1---low quality flux
10=2---medium quality
11=3---high quality flux
2 Band rejected
3 Band accepted
4-7 final reason for rejection
0000=0= not rejected
0001=1= not weeks-confirmed
0010=2= bad flux status
0011=3= bad correlation coefficients
0100=4= bad confusion status
0101=5= inconsistent fluxes
0110=6= weaker neighbor
0111=7= confused neighbor
1000=8= merging problems
9-15= spare
Byte 2 (Faults with Source)
0 not weeks-confirmed
1 bad flux status
2 bad correlation coefficient
3 bad confusion status
4 inconsistent fluxes
5 weaker neighbor
6 confused neighbor
7 merging problems
Table X.B.7d.
Bit # Meaning
0-3 Discrepant Flux found
in band.
BIT 0, 12 µm,
BIT 1, 25 µm, etc.
4,5 SPARE
6 (X) fix (Section VII.C)
7 Source accepted in
catalog