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MAXI J1807+132 is a low-mass X-ray binary (LMXB) first detected in outburstin 2017. Observations during the 2017 outburst did not allow for an unambiguousidentification of the nature of the compact object. MAXI J1807+132 was detectedin outburst again in 2019 and was monitored regularly with NICER. In this paperwe report on five days of observations during which we detected threethermonuclear (Type-I) X-ray bursts, identifying the system as a neutron starLMXB. Time-resolved spectroscopy of the three Type-I bursts revealed typicalcharacteristics expected for these phenomena. All three Type-I bursts show slowrises and long decays, indicative of mixed H/He fuel. We find no strongevidence that any of the Type-I bursts reached the Eddington Luminosity;however, under the assumption that the brightest X-ray burst underwentphotospheric radius expansion, we estimate a <12.4kpc upper limit for thedistance. We searched for burst oscillations during the Type-I bursts from MAXIJ1807+132 and found none (<10% amplitude upper limit at 95% confidence level).Finally, we found that the brightest Type-I burst shows a ~1.6sec pause duringthe rise. This pause is similar to one recently found with NICER in a brightType-I burst from the accreting millisecond X-ray pulsar SAX J1808.4-3658. Thefact that Type-I bursts from both sources can show this type of pause suggeststhat the origin of the pauses is independent of the composition of the burningfuel, the peak luminosity of the Type-I bursts, or whether the NS is an X-raypulsar.

Discovery of Thermonuclear Type-I X-ray Bursts from the X-ray binary MAXI J1807+132