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| Mission/Instruments | Science Requirement Absolute Time | Timing System Design | Timing Calibration Status | In-orbit Timing Calibration Targets | Reported Issues | Reference | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Requirement | Goal | GPS Receiver | Clock Stability | (Absolute Timing Precision) | |||||||||
RXTE/PCA  | |||||||||||||
| Chandra / ACIS | |||||||||||||
| Chandra / HRC | |||||||||||||
| XMM-Newton/EPIC-MOS | |||||||||||||
| XMM-Newtion/EPIC-PN | 1 ms | No | 108 μsec | Crab pulsar (bi-annual) | None currently | Kirsch et al, SPIE, 5165, 85 Martin-Carrillo et al, A&A, 545, A126 (2012) CAL-TN-0220-1-4.pdf (Limited access) | |||||||
| INTEGRAL/SPI | |||||||||||||
| INTEGRAL/IBIS | |||||||||||||
| Swift/BAT | |||||||||||||
| Swift/XRT | |||||||||||||
Suzaku/XIS | No science requirement defined. | No | 1.9 x 10^-9 s/s | Not confirmed. | A0535+262, Her X-1, etc | N/A | Y.Terada et al 2008 (10.1093/pasj/60.sp1.S25) | ||||||
| Suzaku/HXD | 360±150 μsec (270±130 μsec in condition) | Crab for coordinated PSR1509-58 | Timing shift by a failure in time stamp at the ground station during 2012-2014 (Shu Koyama, Fixed) | ||||||||||
| NuSTAR/FPM | Should be 100 ms | none | No | Freely drifting by ~3 ms/day. | 65 us (1-sigma) | Crab | ~5ms offset using Corrected through | Bachetti+ in prep (can distribute early copy) | |||||
| Astrosat | |||||||||||||
| HXMT | |||||||||||||
| Hitomi/SXS, SXI, HXI, SGD | 350 μsec | 35 μsec | Yes | 0.01μsec(GPSR) | ~ 120-230 μsec | Crab (with radio) note: using out-of-time event for SXI | absolute timing accuracy is much larger than expected on ground (3 μsec) | Y.Terada et al 2018 (10.1117/1.JATIS.4.1.011206) | |||||
| NICER | 100 ns (RMS) | none | Yes | N/A | Approx. 3 µs | Crab Pulsar PSR B1821-24A PSR B1937+21 | Precise 1-second offset in on-board timestamps due to flight software bug; corrected using TIMEZERO keyword in pipeline-processed FITS data files. | Markwardt et al. (in prep.) | |||||
| eROSITA | |||||||||||||
XRISM/Resolve  | 1 msec | none | Yes | same as Hitomi | (under discussion) | ||||||||
| XRISM/Xtend | 10 msec | none | Yes | (under discussion) | |||||||||
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