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[XTEnews]: HEXTE Cluster B Update
As announced on the RXTE Web pages early this year, HEXTE Cluster B ceased modulation
(i.e., began "staring" instead of "rocking") on December 14, 2009, at approximately
16:10 UT. In January, the RXTE team performed a reboot of cluster B that successfully
restored modulation, but only for a brief period before it ceased again. After careful
consideration, the RXTE team has decided to permanently leave HEXTE Cluster B in an
off-source position, rather than risk it becoming unrecoverable in some other position.
The detectors in cluster B are still functioning well and collecting data. The off-source
position of data taken by HEXTE Cluster B will thus complement the data taken by HEXTE
Cluster A, which, since October 20, 2006, has been "staring" in an on-source position.
For further details, including the exact times and dates that Cluster B was not rocking
and a description of how to analyze HEXTE data from these periods, please see this
"Latest News" item on the RXTE Web pages: