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RXTE PCA Snapshots of IGR J16318-4848 and IGR J19140+098

ATel #128; J. H. Swank (GSFC) & C. B. Markwardt (U. Maryland & GSFC)
on 18 Mar 2003; 02:50 UT
Credential Certification: Jean Swank (swank@milkyway.gsfc.nasa.gov)

Subjects: X-ray, Binary, Black Hole, Transient, Pulsar

RXTE carried out brief observations of the INTEGRAL sources IGR_J19140+098 (Hannikainen et al. 2003, IAUC 8088 )and IGR_J16318-4848 (Courvoisier et al. 2003, IAUC 8063 ; see also Murakami et al. 2003, IAUC 8070 and Schartel et al. 2003, IAUC 8072 ). No pulsations were identified from either. The data will be public. IGR_J16318-4848 was observed Mar 14.1-14.2 UT from an offset position, to avoid other sources. The source was steady. A consistent model flux contained 7e-11 ergs cm**-2 s**-1 2-10 keV and 3e-10 ergs cm**-2 s**-1 10-60 keV. This model (not unique) contained two power laws, one with photon index 1.7 and equivalent hydrogen column density of 1.3e24 cm**-2, the other with photon index of 5 and column of 1.3e23 cm**-2. A very strong Fe emission complex was present, as was found by Revnivtsev et al.(2003; astro-ph/0303274)in ASCA archival data. IGR_J19140+098 was observed Mar 10.8 UT. Significant irregular variability is present on time scales longer than 100 s. The spectrum is consistent with a power law of photon index 1.6 and hydrogen column 6e22. An Fe line complex with equivalent width of 550 eV was present. The fluxes in ergs cm**-2 s**-1 were 1e-10 2-10 keV and 2e-10 10-60 keV.