Or it's the typical circa-7-day lead time for an alert for a media teleconference announcement:

04.17.06 - Black Holes Found to be "Green"
Astronomers using NASA's Chandra X-ray Observatory will hold a media teleconference at 1 p.m. EDT Monday, April 24

04.11.06 - Black Hole Merger Breakthrough
NASA will hold a media teleconference 1 p.m. EDT Tuesday, April 18

03.29.06 - NASA Announces Spitzer Planet Finder Update
Astronomers using NASA's Spitzer Space Telescope will hold a media teleconference at 1 p.m. EST Wednesday, April 5

Dec. 10, 2007 MEDIA ADVISORY : M07-178 NASA Announces Discovery of Assault by a Black Hole WASHINGTON - Astronomers will hold a media teleconference Monday, Dec. 17

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