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We consider possible indications of Very-Short-BaseLine (VSBL) electron neutrino disappearance into sterile neutrinos in MiniBooNE neutrino data and Gallium radioactive source experiments.
We discuss the compatibility of such a disappearance with reactor and MiniBooNE antineutrino data.
We find a tension between neutrino and antineutrino data which could be due to: 1) statistical fluctuations;
2) underestimate of systematic uncertainties;
3) exclusion of our hypothesis of VSBL nu_e disappearance;
4) a violation of CPT symmetry.
Considering the first possibility,
we present the results of a combined fit of all data,
which indicate that P_{ee}
< 1 with 97.05% CL.
We consider also the possibility of CPT violation,
which leads to the best-fit value A_{ee}^{CPT,bf} = - 0.165 for the asymmetry of the nu_e and antinu_e survival probabilities and A_{ee}^{CPT}
< 0 at 99.71% CL.
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