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The near-infrared counterpart of X-ray transient MAXI J1535-571

ATel #10716; Tolga Dincer (Yale University)
on 6 Sep 2017; 19:05 UT
Credential Certification: Tolga Dincer (tolga.dincer@yale.edu)

Subjects: Infra-Red, Binary, Transient

Referred to by ATel #: 10761, 10768, 10816, 11020

The discovery of the X-ray transient MAXI J1535-571 has been reported in GCN #21788, ATEL #10699, #10700, #10708, and #10711. Soon after, the optical counterpart of the source has been identified in ATEL #10702 and #10704. Following its optical identification, we conducted near-infrared (NIR) observations of the source with the SMARTS 1.3m telescope at CTIO. We detected the NIR counterpart of the source and the source seems to be brightening in the NIR. This NIR source does not exist in the 2MASS point source catalogue, confirming the optical/NIR counterpart of the recently activated X-ray transient MAXI J1535-571. The results from our two observations are:

MJD (J-band)	J-mag	MJD (H-band)	H-mag
58000.990 14.88 58000.983 13.11
58001.993 14.68 58001.985 12.79
The calibration is done through the 2MASS catalogue value of the nearby field stars. Combined errors due to photometry and calibration are typically ~0.03 mag. Each observation consisted of 9 dithered images of 50s. Our monitoring observations of MAXI J1535-571 will continue. We encourage further multiwavelength observations of the source.