Outbursts from the SFXT IGR J17544-2619 detected by Swift
ATel #7137; H. A. Krimm (CRESST/GSFC/USRA) and P. Romano (INAF-IASF Palermo)
on 25 Feb 2015; 01:19 UT
Credential Certification: Hans A. Krimm (Hans.Krimm@nasa.gov)
Subjects: X-ray, Binary, Transient, Pulsar
Referred to by ATel #: 7141
The Swift/BAT transient monitor has detected a series of flares from the HMXB/SFXT IGR J17544-2619 (e.g. Romano et al, 2014, A&A, 562, A2). Significant activity from this source was detected during the following observations:
| DATE | MJD..... | .....UTC..... | EXP(s) | RATE (ct/s/cm^2) | MCRAB | SNR | |
| 2015-Feb-21 | 57073 | 23:39:01 | 1344 | 0.014 +/- 0.003 | 65 | 5.4 |
| 2015-Feb-22 | 57073 | 01:06:21 | 1056 | 0.020 +/- 0.005 | 91 | 4.1 |
| 2015-Feb-22 | 57073 | 01:25:17 | 704 | 0.011 +/- 0.003 | 48 | 3.1 |
| 2015-Feb-22 | 57073 | 07:35:17 | 192 | 0.034 +/- 0.009 | 152 | 3.7 |
| *2015-Feb-22 | 57073 | 07:51:33 | 656 | 0.043 +/- 0.005 | 197 | 9.2 |
| 2015-Feb-22 | 57073 | 13:43:25 | 984 | 0.012 +/- 0.003 | 53 | 3.6 |
All count rates are in the 15-50 keV band. The starred exposure also triggered on-board, but below the threshold to generate an automatic slew.
Swift/XRT observations were obtained as a Target of Opportunity,
on 2015-02-24 from 17:11:55 to 17:28:25 UT (0.9 ks net exposure,
about 51 hours after the flare), and yield a 3-sigma upper limit
of 2.1E-2 ct/s.
The last Swift outburst of this source was detected on 2014 Oct 10 (Romano et al. 2015, A&AL, in press, arXiv:1502.04717).
See ATel #6566 for a list of previous outbursts.
Swift/BAT transient monitor light curve for IGR J17544-2619
