The desk and chair were shaking a little heavily when I was tutoring a middle school student at about 16:23. After a while, about a minute, it stopped. My wife called me and told me that The magnitude of this aftershock is 6.4 which happened in Qingchuan, Sichuan, heard from TV.
The date from China Earthquake Networks Center:
地震参数 时间: 2008-05-25 16:21:47.0
However, the EMSC said it was 5.9.
The data from EMSC:
Magnitude mb 5.9
Region: SICHUAN-GANSU BORDER REG, CHINA
Date time: 2008-05-25 at 08:21:49.0 UTC
Location: 32.62 N ; 105.45 E
Depth : 10 km
Distances : 45 km NW Guangyuan (pop 213,365 ; local time 16:21 2008-05-25)
125 km NW Baoning (pop 60,542 ; local time 16:21 2008-05-25)