Bright X-ray Transient, XTEJ0421+560
D. Smith and R. Remillard (M.I.T.), Jean Swank, T. Takeshima, and E. Smith (NASA / GSFC) report:
The RXTE All-Sky Monitor has detected a bright and rapidly rising X-ray transient, which we designate XTE J0421+560. The best fit position is at R.A. = 04h21.0m and Dec. = +56 03.5' (equinox 2000.0), with an error radius (90% confidence) of 4'. The ASM count rate (2-12 keV) was below 40 mCrab (at 3 sigma) on March 31.36, rising rapidly thereafter to 139 mCrab (March 31.64), 504 (31.77), and 1880 (April 1.04). An RXTE PCA observation, which began on April 1.08, confirms the presence of a new source with a flux near 2 Crab. The ASM spectrum appears very hard, but the PCA light curve shows no obvious pulsations at periods longer than 0.25 s. Observations at other wavelengths are urgently needed.
V-magnitude calculated from USNO A1.0 by using V=r+0.375(b-r):
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