National Aeronautics and Space Administration

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Background model epoch boundaries are listed below. Observers who still use invidividual background files can download them from here. Use these only if you have a special need.

NOTE: It will be much more convenient to use the mission-long background models listed on the main PCA Digest page.

Epoch	Start Time	Stop Time	Faint Model	Bright Model
Epoch 1	Launch	21 Mar 1996 18:33	Download	Download
Epoch 2	21 Mar 1996 18:34	15 Apr 1996 23:05	Download	Download
Epoch 3A	15 Apr 1996 23:06	09 Feb 1998 00:00	Download	Download
Epoch 3B	09 Feb 1998 00:00	22 Mar 1999 17:38	Download	Download
Epoch 4	22 Mar 1999 17:39	13 May 2000 00:00	Download	Download
Epoch 5A	13 May 2000 00:00	01 Jan 2002 00:00	Download	Download
Epoch 5B	01 Jan 2002 00:00	01 Jan 2004 00:00	Download	Download
Epoch 5C	01 Jan 2004 00:00	Present	Download	Download

This page is maintained by the RXTE GOF and was last modified on Wednesday, 24-Aug-2022 11:10:32 EDT.