We present RXTE/PCA and HEXTE data from the time of the double-peaked
MOST flare, where the spectra have been fit with multi-temperature
disk + power-law and multi-temperature disk + sombrero
(ie. disk + comptonized hot corona) models.
In addition, we present a CGRO/OSSE spectrum from the time
immediately succeeding the second (more intense) radio flare.
The OSSE spectrum has been fit with a hybrid model, which takes
into account thermal and nonthermal particle energy distributions.
The addition of the nonthermal model component provides a much better
fit to the high energy portion of the spectrum of GRS 1915+105
than a purely thermal
model (e.g. Vilhu 1999). We consider possible scenarios that
would accomodate the need for a hybrid solution, including
one that would reinforce the jet ejection hypothesis for the
1996 radio flaring event, in which the nonthermal component
arises from electrons which are a relic of an ejection event.
We also consider the case where there is a persistent nonthermal
component, and discuss the pros and cons of the two scenarios.
Fender, R. et al. 1999, MNRAS, 304, 865
Hannikainen, D. et al. 1999, ASP Conf. Ser., 161, 88
Vilhu, O. 1999, ASP Conf. Ser., 161, 82