Swift/BAT trigger on EXO 0748-676 is a Type I X-ray burst
ATel #16655; Erik Kuulkers (ESA/ESTEC)
on 15 Jun 2024; 12:33 UT
Credential Certification: Erik Kuulkers (erik.kuulkers@gmail.com)
Subjects: X-ray, A Comment, Binary, Neutron Star, Transient, Variables
The Swift/BAT trigger #1236151(D'Elia et al., GCN Circ. 36653) at 10 June 2024 07:36:36 UT on EXO 0748-676 shows a fast rise exponential decay profile in the15-25 keV energy range, with a T90 (15-350 keV) value of ~8 sec (Moss et al., GCN Circ. 36657). The results of the batgrbproduct analysis are available at https://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1236151 (Moss et al., GCN Circ. 36657). As shown, a black-body spectral fit to the peak spectrum reveals kT=3.0 (-0.8,+ 1.1; 90% confidence) keV and R^2/D10^2 = 45 (-45, +242), where R is the radius in km and D10 is the distance to the source in units of 10 kpc. The light curve and spectral values are typical for strong Type I X-ray bursts at hard X-rays, such as observed by the Swift/BAT or INTEGRAL/ISGRI (see, e.g., Kuulkers et al., 2010, A&A 514, A65). This is thus an earlier (Type I) X-ray burst from the source, more than 3 days before the X-ray burst reported from MAXI/GSC (Mihara et al., ATel #16654).
