GRO J2058+42 Observations with BATSE and RXTE
Colleen A. Wilson
Mark H. Finger, D. Matthew Scott
GRO J2058+42 is a 196 second pulsar discovered with BATSE during a giant
outburst in 1995. It underwent a series of 9 weaker outbursts from 1995 to 1997
which alternated in pulsed intensity, with a 110 day cycle in the 20-50 keV
band (Wilson, C.A. et al. 1998, ApJ, 499, 820). These outbursts did not show the
same intensity variations in the 2-10 keV observations with the RXTE ASM
(Corbet, R. et al., 1997, IAU Circ. 6556). Additional outbursts after this
series were observed with BATSE, using a more sensitive search method which
accounts for excess aperiodic noise from Cygnus X-1, and with the RXTE PCA and
ASM. A set of two outbursts, one ``periastron" and one ``apastron" outburst
(assuming a 110 day orbital period) were observed with the RXTE PCA. Pulse shape
differences were found between the two outbursts. Histories of pulse frequency,
pulsed flux, and total flux are presented. Pulse profiles and spectra from PCA
observations are also presented.
File translated from TEX by TTH, version 2.32.
On 16 Jul 1999, 09:19.