Latest revision  6 Dec. 1996

TJD 10416-10417 = November 29-30, 1996

A flight software upset (bit flip) occurred at TJD/SoD 10415/16347.
The effect was not noticed until the readout of the next trigger (5698)
which occurred on TJD 10416.  As a result of the upset and the attempts
to reset the flight software, two accidental triggers occurred (5699 
and 5702) and the count rates changed discontinuously to different 
levels for different (but not all) detectors and channels.  Eventually,
the rates returned to their "proper" values, in one case when the high
voltage was turned back on after the SAA.

It was decided to treat the time intervals when the rates were bad as
intervals when the high voltage was off.  Therefore, quality flag 50
was added to the quality flag files for the times
     10416/16897 - 10416/19200
     10417/70332 - 10417/71000

The gains for all of the LA detectors were out of balance between 
10416/16897  and soon after the high voltage was turned on and 
the AGC activated at  10418/69320  after the flight software began
to be properly reset.  A few AGC commands were given during the
overall interval when triggers occurred so that there were HER
readouts.  However, the gains do not appear to have been very far 
out of balance and no quality flag 64 was set.

HER and SHER readouts halted during most of the overall interval
(except during trigger readouts) so that some HER and SHER records 
cover extremely long accumulation times.  These include the following:
     TJD 10416   10416/22931 - 10416/41080
     TJD 10417   10416/46538 - 10417/19407
     TJD 10417   10417/24865 - 10417/70853
     TJD 10418   10417/76311 - 10418/67415

Pulsar readouts also halted during the overall interval.
No pulsar (PSR_DATA.n) files were created at all on TJD 10417.
The pulsar files on TJDs 10416 and 10418 are smaller than normal.