Between Oct 1999 and Jun 2001 Chandra observed M31 on a nearly monthly schedule. These observations allowed the discovery of 14 X-ray transients, a few of which...

For nearly a century Black holes have been a hot topic, a physical singularity or simply a flawed, all be it brilliant, mathematical concept? Fundamental proof...

We report the discovery of a previously unseen X-ray source detected in a 5ks Chandra/ACIS observation starting on 2008-11-27.72 UT as part of our ongoing...

We report the discovery of a previously unseen X-ray source detected in a 5ks Chandra/ACIS observation starting on 2009-03-11.59 UT as part of our ongoing...

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Based on a 5ks Chandra ACIS-I observation of M31 on Nov 11 2009, we report a dramatic brightening of CXOM31 J004321.1+411751, [aka r3-7 (Kong et al. 2002 ApJ...

We present the results from a short (10 ks) Chandra GO1 observation of the nearby (z=0.051) radio source 3C371. The source is known to exhibit a 4.5arcsec-long...

We report the discovery of 2 previously unseen X-ray sources detected in a 5ks Chandra/ACIS observation starting on 2008-09-01.32 UT as part of our ongoing...

We triggered a Chandra ToO observation of the ongoing outburst of a transient source in the globular cluster Terzan 5 (ATel #2919, #2920, #2922, #2924, #2929,...