Was it just me? or did AO-51 drop off-line at 00:44:50?
Looks like you caught the mode change. Here's this month's schedule from http://www.amsat.org/amsat-new/echo/CTNews.php .
January 2009 AO-51 Schedule
All modes using the 435.150 downlink are subject to interruption for telemetry collection by a command station.
January 5 - January 11
FM Repeater, V/S Uplink: 145.880 MHz FM Downlink: 2401.200 MHz FM
9k6 BBS, L/U Uplink: 1268.700 MHz 9k6 FM Downlink: 435.150 MHz 9k6 FM
January 12 - January 18
FM Repeater, V/U Uplink: 145.920 MHz FM Downlink: 435.300 MHz FM
FM Repeater, L/U Uplink: 1268.700 MHz FM Downlink: 435.150 MHz FM
January 19 - January 25
FM Repeater, V/U Uplink: 145.920 MHz FM Downlink: 435.300 MHz FM
9k6 BBS, L/U Uplink: 1268.700 MHz 9k6 FM Downlink: 435.150 MHz 9k6 FM
January 26 - February 1
FM Repeater, L/S Uplink: 1268.700 MHz FM Downlink: 2401.200 MHz FM
SSTV Repeater, V/U Uplink: 145.860 MHz FM SSTV Downlink: 435.150 MHz FM SSTV
73, Drew KO4MA AMSAT-NA VP Operations