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MAXI J1621-501 is the first Swift/XRT Deep Galactic Plane Survey transientthat was followed up with a multitude of space missions (NuSTAR, Swift,Chandra, NICER, INTEGRAL, and MAXI) and ground-based observatories (Gemini,IRSF, and ATCA). The source was discovered with MAXI on 2017 October 19 as anew, unidentified transient. Further observations with NuSTAR revealed 2 Type IX-ray bursts, identifying MAXI J1621-501 as a Low Mass X-ray Binary (LMXB) witha neutron star primary. Overall, 24 Type I bursts were detected from the sourceduring a 15 month period. At energies below 10 keV, the source spectrum wasbest fit with three components: an absorbed blackbody with kT = 2.3 keV, acutoff power law with index $\Gamma{}$ = 0.7, and an emission line centered on6.3 keV. Timing analysis of the X-ray persistent emission and burst data hasnot revealed coherent pulsations from the source or an orbital period. Weidentified, however, a super-orbital period $\sim{}$78 days in the source X-raylight curve. This period agrees very well with the theoretically predictedradiative precession period of $\sim{}$82 days. Thus, MAXI J1621-501 joins asmall group of sources characterized with super-orbital periods.

Discovery and Identification of MAXI J1621-501 as a Type I X-ray Burster with a Super-Orbital Period