"The discovery was first made last September by a graduate student in
Texas." How come it is just being announced now?

How come it is just being announced now??? (The Nasa article ...
doesn't even tell when it was first observed.)

The discovery was first made last September by a graduate student in
Texas. ...  Unlike other exploding stars, which peak at brightness for
a couple of weeks at most, this supernova, peaked for 70 days,
according to NASA. And it has been shining at levels brighter than
other supernovae for several months, Smith said.
 

brightest supernova astronomers have ever seen ...

http://www.breitbart.com/article.php?id=D8OVMVQO0&show_article=1

Brightest Star Explosion Ever Spotted
May 7 02:27 PM US/Eastern By SETH BORENSTEIN AP Science Writer

WASHINGTON (AP) - A massive exploding faraway star-the brightest
supernova astronomers have ever seen-has scientists wondering if a
similar celestial fireworks show may light up the sky much closer to
Earth sometime soon ...
 
 

"This was a truly monstrous explosion, a hundred times more energetic
than a typical supernova"

http://science.nasa.gov/headlines/y2007/07may_bigsupernova.htm?list150199

May 7, 2007: The brightest stellar explosion ever recorded may be a
long-sought new type of supernova, according to observations by NASA's
Chandra X-ray Observatory and ground-based optical telescopes. This
discovery indicates that violent explosions of extremely massive stars
were relatively common in the early universe, and that a similar
explosion may be ready to go off in our own galaxy.

"This was a truly monstrous explosion, a hundred times more energetic
than a typical supernova," said Nathan Smith of the University of
California at Berkeley, who led a team of astronomers from California
and the University of Texas in Austin. "That means the star that
exploded might have been as massive as a star can get, about 150 times
that of our sun. We've never seen that before." ...