Abstract
The JEM-X twin X-ray monitors on board the INTEGRAL satellite have again detected a new X-ray transient during the latest observation of the Galactic Center region. The new source named IGR J17454-2919 is found less than 24 arcmin from the Galactic Center.
The source appears in both JEM-X 3-10 keV and 10-25 keV independent mosaic images of each monitor, obtained from the observations of the Galactic Bulge region and Galactic Center performed during INTEGRAL revolution 1460 between 2014 September 27 UTC 19:00 - 22:42, and from September 28 UTC 03:40 to September 30 UTC 01:44. It was not detected during any previous recent observations of the region leading to a 3-25 keV flux upper limit of 1 mCrab.
The average JEM-X fluxes are 6.5 ±1 mCrab (3-10 keV) and 8.2 ±1.7 mCrab (10-25 keV).
No significant time variation is seen in the source light-curve.
A Swift follow-up observation of 2 ksec exposure has been executed on October 2 between UTC 17:57 and 19:49. Though a PSF-fitted position cannot be obtained the new INTEGRAL source is clearly visible on the XRT image, only 10 arcsec from the JEM-X position, at:
R.A. = 266.366 equivalent to 17h45m28s
Dec. = -29.332 equivalent to -29d19m55s
with a 90% error confidence of 5 arcsec.
The XRT 0.3-10 keV PC-mode count-rate is 0.64 ±0.03 cnt/s.
Further analysis of the Swift data is on-going. We thank the Swift team for having performed this observation of the new transient source.
Multi-wavelength follow-up observations are encouraged to unveil the nature of IGR J17454-2919.
The source appears in both JEM-X 3-10 keV and 10-25 keV independent mosaic images of each monitor, obtained from the observations of the Galactic Bulge region and Galactic Center performed during INTEGRAL revolution 1460 between 2014 September 27 UTC 19:00 - 22:42, and from September 28 UTC 03:40 to September 30 UTC 01:44. It was not detected during any previous recent observations of the region leading to a 3-25 keV flux upper limit of 1 mCrab.
The average JEM-X fluxes are 6.5 ±1 mCrab (3-10 keV) and 8.2 ±1.7 mCrab (10-25 keV).
No significant time variation is seen in the source light-curve.
A Swift follow-up observation of 2 ksec exposure has been executed on October 2 between UTC 17:57 and 19:49. Though a PSF-fitted position cannot be obtained the new INTEGRAL source is clearly visible on the XRT image, only 10 arcsec from the JEM-X position, at:
R.A. = 266.366 equivalent to 17h45m28s
Dec. = -29.332 equivalent to -29d19m55s
with a 90% error confidence of 5 arcsec.
The XRT 0.3-10 keV PC-mode count-rate is 0.64 ±0.03 cnt/s.
Further analysis of the Swift data is on-going. We thank the Swift team for having performed this observation of the new transient source.
Multi-wavelength follow-up observations are encouraged to unveil the nature of IGR J17454-2919.
| Original language | English |
|---|---|
| Publication date | 3 Oct 2014 |
| Number of pages | 1 |
| Publication status | Published - 3 Oct 2014 |
| Series | The Astronomer's telegram |
|---|---|
| Number | ATel #6530 |
Keywords
- X-ray
- Transient