Shift report A8 July 29 1999, 8:00am EDT, GMT 210:12:00

First event mode data from ACIS !!!!!!!!

ACIS Activities this Shift:

1. Event Histogram Mode run on the ACIS-I Array
   OBSID 62973
   1st Data Packet at GMT 211:01:41:53
   Stop Science    at GMT 211:06:26:00

   Wonderful data on the internal cal source, the spectra clearly
shows the Mn K-alpha, K-beta, the escape peaks, the Mn-L line and
various weaker lines.  The spectral resolution is fine and the gain is
fine.  The higher on-orbit background does not effect the spectrum
significantly.

   
2. Internal Cal Source Measurements
   FP Temp = -118.7 or -118.9 C
  
   We had some trouble getting started because the latest versions of
our scripts were not in the UDE.  The anomaly coordinator insisted on
reviewing our scripts in realtime while the spacecraft time wasted
away. Sigh.

   - Timed Exposure Faint Mode on the I array, no g7 events
   OBSID 62775
   Start Science at GMT 211:08:05:08
   Stop Science  at GMT 211:10:20:30
 
   The spatial distribution of the internal cal source counts look the
same as preflight.  The spectra look similar to the Event Histogram
data.  The total rate was about 100 c/s, well within TLM limits for
Faint mode.


   - Timed Exposure Faint Mode on the S array, no g7 events
   OBSID 62774
   Start Science at GMT 211:10:24:04
   Stop Science  at GMT 211:12:50:00


   - Timed Exposure Faint Mode, accept counts from S2 and S3 only, no
b255 events, event amplitude filter at 2900 ADU
   OBSID 62773
   Start Science at GMT 211:12:5?:??



Spacecraft activities

- HRC continued their activation but did not ramp up their HV to
oerational values or put in their cal source.   ACIS then swooped in
and utilized the time to get more internal background data.
- the spacecraft did several manuevers last night, none effected ACIS
- work continues to prepare for the final earth scan before IPS burn
#3
- we continue to plan with the spacecraft folks to squeeze in as many
ACIS activities as possible


Staff

ACIS - Mark Bautz, Mike Pivovaroff, Royce Buehler, Paul Plucinsky,
Shanil Virani
SOT Lead - Dan Schwartz
ACA - Bill Podgorski