Swift J16444+57: dramatic drop in intensity for the past month
Abstract
The Swift XRT monitoring of tidal disruption event Swift J1644+57, discovered by Swift on 2011 March 28 has shown a dramatic decrease in the X-ray count rate starting the 5th of August, with the source dropping from a count rate of ~ 1.0E-2 counts/s (5.1E-13 erg cm^-2 s^-1) to a rate not detectable with the 1 ks daily exposure used since March 2012 for our monitoring program.
In order to assess the state of the source we have increased the length of our daily observations, first to 3 ks/day and then to 10 ks/day beginning on September 14th.- Publication:
-
The Astronomer's Telegram
- Pub Date:
- September 2012
- Bibcode:
- 2012ATel.4398....1S
- Keywords:
-
- X-ray;
- Transient