Discoveries and Timing of Pulsars in NGC 6440
  Using the MeerKAT radio telescope, a series of observations have been
conducted to time the known pulsars and search for new pulsars in the globular
cluster NGC 6440. As a result, two pulsars have been discovered, NGC 6440G and
NGC 6440H, one of which is isolated and the other a non-eclipsing (at
frequencies above 962 MHz) "Black Widow", with a very low mass companion
(M$_{\rm c}$ > 0.006 M$_{\odot}$). It joins the other binary pulsars discovered
so far in this cluster which all have low companion masses (M$_{\rm c}$ < 0.30
M$_{\odot}$). We present the results of long-term timing solutions obtained
using data from both Green Bank and MeerKAT telescopes for these two new
pulsars and an analysis of the pulsars NGC 6440C and NGC 6440D. For the
isolated pulsar NGC 6440C, we searched for planets using a Markov Chain Monte
Carlo technique. We find evidence for significant unmodelled variations but
they cannot be well modelled as planets nor as part of a power-law red-noise
process. Studies of the eclipses of the "Redback" pulsar NGC 6440D at two
different frequency bands reveal a frequency dependence with longer and
asymmetric eclipses at lower frequencies (962-1283 MHz).
