In the title compound, C(10)H(6)BrN(3)O(2), the indazole fused-ring system is nearly planar (r.m.s. deviation = 0.008 Å); its nitro substituent is nearly coplanar with the fused ring [dihedral angle = 4.5 (2)°]. In the crystal, adjacent mol-ecules are linked by weak acetyl-ene-nitro C-H⋯O hydrogen bonds, generating a helical chain running along the b axis.