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ATEL # 1557; D. Palmer (LANL), H. Krimm (GSFC/USRA), S. Barthelmy (GSFC)
on 4 Jun 2008; 3:50 UT
Password Certification: David M. Palmer (email@example.com)
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 http://swift.gsfc.nasa.gov/docs/swift/results/transients/AqlX-1