Flares from a new Integral hard X-ray source, IGR J17407-2808, likely associated with the ROSAT source SBM 10
ATel #345; P. Kretschmar (MPE/ISDC, Versoix), S. Mereghetti (IASF, Milano), W. Hermsen (SRON, Utrecht), P. Ubertini (IASF, Roma), C. Winkler (ESTEC, Nordwijk), S. Brandt (DSRI, Copenhagen), R. Diehl (MPE, Garching)
on 14 Oct 2004; 14:14 UT
Credential Certification: Peter Kretschmar (Peter.Kretschmar@obs.unige.ch)
Subjects: X-ray, Gamma Ray, Transient
Referred to by ATel #: 3685
On Oct 9, 2004 Integral observed hard X-ray flares from a source located
at R.A.=17h 40.7m, Dec.=-28s 08' (J2000, error radius 2.3').
This new hard X-ray source, IGR J17407-2808, is positionally
coincident with a faint ROSAT source listed as no. 10 in the catalogue
of sources in the Galactic Center region by
Sidoli, Belloni & Mereghetti 2001, A&A 368, 835 and as 2RXP J174040.9-280852
ROSAT Source Browser. No other observations of [SBM2001] 10
have been published up to date.
The flares were observed with the IBIS instrument in the 20-60 keV
energy range, starting at MJD 53287.6310 and over a timespan of 2000
seconds finishing in a strong flare at MJD 53287.6327.
Before and after this time period the source was not detected.
The last flare, with peak fluxes of 0.8±0.1 Crab and 0.6±0.1 Crab in
the energy ranges 20-40 keV and 40-60 keV respectively, triggered an
automatic alert message of the Integral Burst Alert System (IBAS Alert
#2010) which led to the discovery of the source (Gotz et al., GCN Circ.
#2793). The source was outside the FOV of the JEM-X and OMC monitor
instruments during this flare.
Note that the position of J17407-2808 is inconsistent with that of the X-ray
burster SLX 1737-282 [AX J1740.7-2818] (in't Zand et al. 2002, A&A 389,
L43), which is just ~11 arcmin away. The correct Integral attitude is
confirmed by other bright sources in the FOV.