TO:   All GCN Sites
RE:   Loss of GRO telemetry
DT:   09 Dec 99

The telemetry from the GRO spacecraft was lost at 15:23 UT 06 Dec 99.
The initial cause was the loss of gyro (1 of 3).  The s/c went into
a sun-pointing safe mode.  Then after tracking was re-established
with the two remaining gyros, a small pointing offset developed
(due to a problem in the pointing table).  While the flight operations people
were working the problem, the normal high bit-rate telemetry was disabled
(only the 1kbps was available).  Full telemetry was re-established
at 20:18 UT 09 Dec 99.  The total loss of data was 3.2 days.
This outage effected only the BATSE-based & COMPTEL-based burst location
notices.  The non-GRO-based notices (XTE, SAX, ALEXIS, etc) part
of the GCN system reamined on-line -- as did the GCN Circulars.