The Astronomer's Telegram
Telegram Index | Search
To The Parent Site

[ Previous | Next ]

Hard X-ray activity from Aquila X-1

ATEL # 1557; D. Palmer (LANL), H. Krimm (GSFC/USRA), S. Barthelmy (GSFC)
on 4 Jun 2008; 3:50 UT
Password Certification: David M. Palmer (

Subjects: Optical, X-ray, Gamma Ray, Binaries, Transients

Swift-BAT confirms in hard X-rays (15-50 keV) the recent increased activity from Aql X-1 seen in optical by Ilovaisky and Chevalier (ATEL #1553). A 4-second long burst was detected from this source with an intensity of 0.9 Crab at 2008-05-29 00:54:26 UT. Since that time, the persistent flux has been rising and is at 60 mCrab as of 2008-06-03.

Previous Aql X-1 outbursts have also been seen as persistent flux and bursts by BAT: most recently a series of six bursts spanning 2007-09-19 to 2007-10-14, during an X-ray and Optical outburst (ATELs #1216, #1218, #1219, #1229, #1232). The outburst of May 2007 (ATELs #1079, #1080) also produced burst activity seen by Swift-BAT and increased persistent flux peaking at 80 mCrab.

The history of the X-ray persistent flux can be seen at the Swift-BAT Transient Monitor page (ATEL #904) for this source

[ Telegram Index ]

R. E. Rutledge , Editor
ATEL Mirror v1.0 Updates