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Recent observations with the GISMO (Goddard-IRAM Superconducting 2 MillimeterObserver) 2 mm camera revealed a detection 8 arcsec away from the lensed galaxyMACS1149-JD1 at z=9.6. Within the 17.5 arcsec FWHM GISMO beam, this detectionis consistent with the position of the high-redshift galaxy and therefore, ifconfirmed, this object could be claimed to be the youngest galaxy producingsignificant quantities of dust. We present higher resolution (8.5 arcsec)observations of this system taken with the AzTEC 1.1 mm camera mounted on theLarge Millimeter Telescope Alfonso Serrano. Dust continuum emission at theposition of MACS1149-JD1 is not detected with an r.m.s. of 0.17 mJy/beam.However, we find a detection ~ 11 arcsec away from MACS1149-JD1, still withinthe GISMO beam which is consistent with an association to the GISMO source.Combining the AzTEC and GISMO photometry, together with Herschel ancillarydata, we derive a z_phot= 0.7-1.6 for the dusty galaxy. We conclude thereforethat the GISMO and AzTEC detections are not associated with MACS1149-JD1. Fromthe non-detection of MACS1149-JD1 we derive the following (3 \sigma) upperlimits corrected for gravitational lensing magnification and for cosmicmicrowave background effects: dust mass < 1.6 x 10^7 M_sun, IR luminosity < 8 x10^10 L_sun, star formation rate < 14 M_sun/yr, and UV attenuation < 2.7 mag.These limits are comparable to those derived for other high-redshift galaxiesfrom deep Atacama Large Millimeter/submillimeter Array (ALMA) observations.

Early Science with the Large Millimeter Telescope: Dust constraints in a z~9.6 galaxy