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SN1999em:
The End of Days - Chandra Catches X-ray Glow From Supernova

SN1999em
Credit: X-ray: NASA/CXC/SAO, Optical: Palomar Observatory Digital Sky Survey

Chandra Observation of Supernova SN1999em. In late October of 1999, a supernova was detected in NGC 1637, a spiral galaxy that is 25 million light years from Earth. Chandra observed the supernova twice soon after the explosion. X rays, shown by contours overlaid on an optical mage, were detected from 3 million degree gas produced by the supernova. An X-ray source in the center of the galaxy was also detected.

Fast Facts for SN1999em:
Credit  X-ray: NASA/CXC/SAO, Optical: Palomar Observatory Digital Sky Survey
Scale  Image is 2 arcmin across.
Category  Supernovas & Supernova Remnants
Coordinates (J2000)  RA 04h 41s 28.08m | Dec -02° 51´ 33.49"
Constellation  Taurus
Observation Dates  October 1 & 11, 1999
Observation Time  18 hours
Obs. IDs  763 and 764
Color Code  Intensity
Instrument  ACIS
Distance Estimate  25 million light years
Release Date  December 14, 1999