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        @    MTA Monitoring Report 4/21/00 - 4/27/00    @
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             ************ CTI trend *************

No major changes are observed. 

Software Note:
Averaged CCD plots had bugs; computation of error bars were wrong. 
It is fixed. 

One caution when you look at averaged plot, especially for the
BI CCDs. Since it is often the case that CCD 5 and CCD 7 are
not used at the same time, for a given time on the plot, 
a point from only one CCD could be plotted. That is why the average
plot for BI CCDs appears to have 2 tracks.


     ************** MTA Problem Tracking *****************

For this week, a following msid was reopened:

MSID	 		      Inst. Unit Date Reopen   Pri.   Scientist
---------------------------------------------------------------------
2PRBSCR (PRIMARY BUS CURRENT) HRC   AMP  4/26/2000      4       M. Juda

Following msids keep coming. 

C28VMONB, CUSOB28V, CIUB5V. CTUB15V, AWD1TQI, QWD4TQI, SEHSE400

Software Note:
The bug reported the last week (missing most recent date) was fixed. 
It was due to an incoming data format change. We lost a few dates
due to this bug.

                ******** Trending  ***********

Some of msids of ACIS Temperatures which displayed significant
scattering between dom 200 and 250 now converged  back to their original
levels.


             *************  Telemetry ***********
Spacecraft temperatures TSCIUSF1 hit a red zone for a significant
amount of time (23.02%) on 4/23. This was first time that it happened. 
It seems a few other spacecraft temperature msids are up ward trend.

On 4/24, HRC electronics settings were changed. Due to these changes,
HRC housekeeping msids displayed significant movement, but nothing
serious. HRC electronics setting changed again on 4/27.


          *********** ACIS Focal Temperature ********

Acis focal plane temperature peaked three times:
        Day (DOY)       Temp (C)
	112.1		-107 		(reported last week)
	114.8		-107
	117.4		-106

             *********** Photon Page ************


OBSID   DETECTOR        GRATING TARGET          ANALYSIS
---------------------------------------------------------
442     ACIS-S          NONE    MKN 421, YOFF-25 OK
797     ACIS-S          NONE    NGC 4631        OK
830     ACIS-S          NONE    JET OF 3C 390.3 OK
402     ACIS-S          NONE    NGC 4395        OK

The following msid was listed under ACIS, but should be HRC

OBSID   DETECTOR        GRATING TARGET          ANALYSIS
---------------------------------------------------------
73      HRC-S           NONE    REJ1236+47      ?????

GRATING Analysis

OBSID   DETECTOR        GRATING TARGET          ANALYSIS
---------------------------------------------------------
1701    ACIS            LETG    XTE J1118+48    MISSING ANALYSIS
705     ACIS-S          HETG    CEN X-3         OK