During INTEGRAL Bulge monitoring (ATel #438; Kuulkers et al. 2007, A&A, 466, 595) observations performed on March 23, 2011, between 6:52 and 10:33 (UTC), the twin X-ray monitor JEM-X detected an X-ray transient source at the position:
RA= 266.20 (17h 44m 48s)
DEC=-29.85 (-29d 51' 00")
(J2000) with an uncertainty of 1.3 arcmin at 95% confidence level.
The Galactic coordinates are: (l, b)= (359.13, -0.32).
The source is detected at 5 σ between 10-25 keV (for 12.3 ks effective exposure), and measured at a flux of 13±3 mCrab (1.5±0.3 ×10-10 erg/cm2/s). It is not detected in other energy bands, leading to a 3 σ upper limit of 5 mCrab between 3-10 keV, which suggests a large amount of absorption. The source is not detected by the IBIS/ISGRI instrument with 5 σ upper limits of about 5 mCrab and 10 mCrab between 18-40 keV and 40-100 keV, respectively.
Both the source position and its high absorption are consistent with the X-ray transient XMMU J174445.5-295044 reported by Heinke et al. 2009, ApJ 701, 1627.
INTEGRAL will continue to monitor the Galactic bulge on March 29 and 31, and observation results from near real time data will be made available at: http://integral.esac.esa.int/BULGE/index.html
Multi-wavelength follow-up observations are encouraged to constrain the nature of this transient.
5086 Coherent Pulsations and Burst Oscillations in the Millisecond Pulsar IGR J18245-2452/PSR J1824-2452I in M28
5069 The transient low-mass X-ray binary IGR J18245-2452 is again active as a radio pulsar
5068 Burst Oscillations in the X-Ray Binary IGR J18245-2452 in M28
5031 HST search of the region around IGR J18245-2452
4981 ATCA radio observation of the region around IGR J18245-2452
4964 Optical amateur observations of the field of IGR J18245-2452 in M28
4961 MAXI/GSC detected two X-ray bursts from IGR J18245-2452 in M28
4960 IGR J18245-2452: an accreting neutron star and thermonuclear burster in M28
4959 A type-I X-ray burst detected by Swift/XRT from the direction of IGR J18245-2452
4929 Swift observations of IGR J18245-2452
4927 IGR J18245-2452 is a new transient located in the core of the globular cluster M28
4925 IGR J18245-2452: a new hard X-ray transient discovered by INTEGRAL
4924 INTEGRAL/IBIS detects a new hard X-ray transient IGR J17446-2948 in the Galactic Center region
4000 INTEGRAL Galactic Bulge monitoring detects activity from XMMU J174445.5-295044 with JEM-X
|Publication date||24 Mar 2012|
|Publication status||Published - 24 Mar 2012|
|Series||The Astronomer's telegram|