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Table 1.

Archival data, obtained from February 2006 to May 2017, of the source at the AT 2021blu location.

UT Date MJD Filter Magnitude Instrumental configuration
2006-02-25 54094.15 B 23.50 (0.14) INT + WFC
2006-02-25 54094.13 V 23.03 (0.26) INT + WFC
2006-12-25 54094.12 r 22.98 (0.12) INT + WFC
2010-03-21 to 2013-02-12 55801.07 ( * ) g 23.27 (0.21) PS1 (stack)
2011-03-14 to 2014-02-09 56246.25 ( * ) r 22.98 (0.18) PS1 (slack)
2011-05-16 to 2015-01-12 56246.96 ( * ) z 22.83 (0.27) PS1 (slack)
2010-12-31 to 2015-01-22 56271.52 ( * ) y > 21.86 PS1 (slack)
2011-03-14 to 2015-01-12 56582.35 ( * ) i 22.86 (0.20) PS1 (slack)
2016-03-09 57456.33 g 23.03 (0.34) Bok + 90prime
2016-02-03 57421.37 r > 22.73 Bok + 90prime
2016-02-04 57422.40 r 22.79 (0.44) Bok + 90prime
2016-02-04 57422.40 z 22.51 (0.35) KPNO4m + Mosaic3
2016-02-06 57424.38 z 22.50 (0.33) KPNO4m + Mosaic3
2016-02-15 57433.38 r > 22.70 Bok + 90prime
2017-03-22 57834.34 z 22.03 (0.18) KPNO4m + Mosaic3
2017-03-25 57837.31 z 22.06 (0.16) KPNO4m + Mosaic3
2017-05-17 57890.21 g > 22.60 Bok + 90prime

Notes. Johnson-Bessell B and V data are in the Vega magnitude scale, while Sloan g, r, i, z and Pan-STARRS y data (Tonry et al. 2012) are in the AB magnitude scale. The Pan-STARRS data were obtained after stacking individal images collected from March 2010 to January 2015. ( * )Average MJD of the stacked image.

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