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We report the results of a high-energy multi-instrumental campaign withINTEGRAL, RXTE, and Swift of the recently discovered INTEGRAL source IGRJ19294+1816. The Swift/XRT data allow us to refine the position of the sourceto RA= 19h 29m 55.9s Dec=+18deg 18' 38.4" (+- 3.5"), which in turn permits usto identify a candidate infrared counterpart. The Swift and RXTE spectra arewell fitted with absorbed power laws with hard (Gamma ~ 1) photon indices.During the longest Swift observation, we obtained evidence of absorption intrue excess to the Galactic value, which may indicate some intrinsic absorptionin this source. We detected a strong (P=40%) pulsation at 12.43781 (+-0.00003)s that we interpret as the spin period of a pulsar. All these results, coupledwith the possible 117 day orbital period, point to IGR J19294+1816 being anHMXB with a Be companion star. However, while the long-term INTEGRAL/IBIS/ISGRI18--40 keV light curve shows that the source spends most of its time in anundetectable state, we detect occurrences of short (~2000-3000 s) and intenseflares that are more typical of supergiant fast X-ray transients. We thereforecannot make firm conclusions on the type of system, and we discuss the possibleimplications of IGR J19294+1816 being an SFXT.

The nature of the X-ray binary IGR J19294+1816 from INTEGRAL, RXTE, and Swift observations