### CONTEXT (Previous Events):
<system_output timestamp="573.401664">I: Retrieving libzstd1 1.5.4+dfsg2-5
</system_output>
<system_output timestamp="573.410113">I: Validating libzstd1 1.5.4+dfsg2-5
</system_output>
<system_output timestamp="573.426269">I: Retrieving login 1:4.13+dfsg1-1+b1
</system_output>
<system_output timestamp="573.435072">I: Validating login 1:4.13+dfsg1-1+b1
</system_output>
<system_output timestamp="573.45362">I: Retrieving logrotate 3.21.0-1
</system_output>
<system_output timestamp="573.461744">... [TRUNCATED TO SAVE SPACE] ...</system_output>
<system_output timestamp="573.476381">... [TRUNCATED TO SAVE SPACE] ...</system_output>
<system_output timestamp="573.483502">... [TRUNCATED TO SAVE SPACE] ...</system_output>
<system_output timestamp="573.498302">... [TRUNCATED TO SAVE SPACE] ...</system_output>
<system_output timestamp="573.506207">I: Validating mawk 1.3.4.20200120-3.1
</system_output>
<system_output timestamp="573.520642">I: Retrieving mount 2.38.1-5+deb12u1
</system_output>
<system_output timestamp="573.528293">I: Validating mount 2.38.1-5+deb12u1
</system_output>
<system_output timestamp="573.543">I: Retrieving ncurses-base 6.4-4
</system_output>
<system_output timestamp="573.551114">I: Validating ncurses-base 6.4-4
</system_output>

### TARGET LINE (Extract and Classify THIS Timestamp):
<system_output timestamp="573.566901">I: Retrieving ncurses-bin 6.4-4
</system_output>

Answer: 573.566901, old event