4U 0115+634 in outburst
ATel #333; J. Tueller, S. D. Barthelmy, H. Krimm, T. Okajima, S. Owens, P. Serlemitsos (NASA/Goddard Space Flight Center), A. Furuzawa, Y. Ogasaka, R. Shibata, K. Tamura, Y. Tawara, K. Yamashita (Nagoya Univ.), H. Kunieda JAXA/ISAS, M. Rex (U of Penn.)
on 23 Sep 2004; 17:18 UT
Credential Certification: Jack Tueller (tueller@nasa.gov)
Subjects: X-ray, Gamma Ray, Binary, Neutron Star, Pulsar
The balloon-borne hard X-ray focusing telescope, InFOCuS, a collaboration between NASA/GSFC, Nagoya University, JAXA/ISAS and the University of Pennsylvania, observed transient X-ray pulsar 4U 0115+634. The pulsar is continuing in outburst as first detected by RXTE/ASM (http://xte.mit.edu/XTE.hmtl) during its observation from Aug. 27 to Sept. 2. InFOCuS was launched by NSBF from Ft. Sumner NM on Sept. 16 and observed 4U 0115+634 for 3.2 ksec starting at 4.6 hrs UT on Sept. 17 The time period from 4.7 to 5.25 hrs UT on Sept. 17 was used to derive the preliminary flux of (3.18 +0.375 -0.324) x 10**-9 erg cm**-2 s**-1 in the 20 to 50 keV range. This flux is consistent with the RXTE/ASM observation. A summed epoch analysis was
performed and the preliminary pulse period is 3.616 +/- 0.001 sec. Further analysis is in process.
