[b]a)[/b] Find all real numbers $a$ such that the parabola $y=x^2-a$ and the hyperbola $y=1/x$ intersect each other in three different points.
[b]b)[/b] Find the locus of centers of circumcircles of such triples of intersection points when $a$ takes all possible values.

[i](I. Gorodnin)[/i]
### Part (a)
To find all real numbers \( a \) such that the parabola \( y = x^2 - a \) and the hyperbola \( y = \frac{1}{x} \) intersect in three different points, we need to solve the equation:
\[
x^2 - a = \frac{1}{x}
\]
Multiplying both sides by \( x \) to clear the fraction, we get:
\[
x^3 - ax = 1
\]
This is a cubic equation in \( x \):
\[
x^3 - ax - 1 = 0
\]
For this cubic equation to have three different real roots, its discriminant must be positive. The discriminant \( \Delta \) of the cubic equation \( x^3 + bx + c = 0 \) is given by:
\[
\Delta = -4b^3 - 27c^2
\]
In our case, \( b = -a \) and \( c = -1 \), so:
\[
\Delta = -4(-a)^3 - 27(-1)^2 = 4a^3 - 27
\]
For the cubic equation to have three distinct real roots, we need:
\[
4a^3 - 27 > 0
\]
Solving this inequality:
\[
4a^3 > 27 \implies a^3 > \frac{27}{4} \implies a > \sqrt[3]{\frac{27}{4}} = \frac{3\sqrt[3]{2}}{2}
\]
Thus, the real numbers \( a \) such that the parabola and the hyperbola intersect in three different points are:
\[
a > \frac{3\sqrt[3]{2}}{2}
\]

### Part (b)
To find the locus of the centers of the circumcircles of the triples of intersection points, we need to determine the coordinates of the circumcenter of the triangle formed by the intersection points.

Let the roots of the cubic equation \( x^3 - ax - 1 = 0 \) be \( k, m, n \). By Vieta's formulas, we have:
\[
k + m + n = 0, \quad kmn = 1, \quad km + mn + nk = -a
\]

The x-coordinate of the circumcenter of the triangle formed by the points \((k, \frac{1}{k}), (m, \frac{1}{m}), (n, \frac{1}{n})\) is given by:
\[
x = \frac{1}{2mnk} + \frac{k + m + n}{2}
\]
Since \( k + m + n = 0 \) and \( kmn = 1 \), we have:
\[
x = \frac{1}{2 \cdot 1} + \frac{0}{2} = \frac{1}{2}
\]

The y-coordinate of the circumcenter can be found by considering the equation of the perpendicular bisectors of the sides of the triangle. For simplicity, we use the fact that the y-coordinate of the circumcenter is given by:
\[
y = \frac{km + mn + nk}{2} - \frac{(k + m)km}{2} + \frac{1}{2k} + \frac{1}{2m}
\]
Using \( km + mn + nk = -a \) and simplifying, we get:
\[
y = \frac{1 - a}{2}
\]

Therefore, the locus of the centers of the circumcircles is given by the line:
\[
x = \frac{1}{2}, \quad y < \frac{2 - 3\sqrt[3]{2}}{4}
\]

The final answer is \( \boxed{ x = \frac{1}{2}, y < \frac{2 - 3\sqrt[3]{2}}{4} } \)