Table 2: ROSAT observations of NGC 2903.
  Central coordinates Date ROR no. Exposure Count ratea Background PI
  RA(2000) Dec(2000)     time [s] [cts s-1] [cts s-1 arcsec-2]  
HRI 9$^{\rm h}$ 32$^{\rm m}$ 9 $.\!\!^{\rm s}$6 +21$^\circ $30$^\prime$00 $^{\prime\prime}$ April 27-29, 1994 600602h 13619 0.020 b 3.6  $\times~10^{-7}$ b N. Junkes
  9$^{\rm h}$ 32$^{\rm m}$ 9 $.\!\!^{\rm s}$6 +21$^\circ $30$^\prime$00 $^{\prime\prime}$ Nov. 7, 1994 dto. 8284     N. Junkes
PSPC 9$^{\rm h}$ 32$^{\rm m}$ 9 $.\!\!^{\rm s}$6 +21$^\circ $30$^\prime$00 $^{\prime\prime}$ May 6-7, 1991 600093p 9184 0.091 3.2  $\times~10^{-7}$ H. Zinnecker
a Background subtracted.
b Combined HRI observations.

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