Effective exposure time, corrected for dead time and lost time (seconds). NOTE: This keyword is present for backward compatibility with ground system software. Where possible, use the FITS Standard keyword XPOSURE for this quantity.
| Attribute | Value |
|---|---|
| data type | float |
| enumerated Values | not defined |
| units | seconds |
| example | 21.474 |
| default value | |
| special processing | VALUE_REQUIRED |
| source | Observatory Status File (OSF) |
| software source | METRICS:completedExposure.photonCollectingTime |
| calculation | TFRAME*(NGROUPS*NFRAMES+(NGROUPS-1)*GROUPGAP+DROPFRAMES1)*NINTS) where DROPFRAMES1 is a lookup value from the PRD Datamode table |
| DB destination | ['ScienceCommon.effexptm'] |
| data type in DB | float |
| instrument | Multiple |
| mode | All |
| product level | 1b |
| FITS hdu | PRIMARY |
| FITS header section | Exposure |