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SMARTS observations of Swift J1357.2-0933

ATel #10329; Tolga Dincer, Charles Bailyn, Bryndis Cruz (Yale)
on 28 Apr 2017; 20:39 UT
Credential Certification: Tolga Dincer (tolga.dincer@yale.edu)

Subjects: Optical

The optical/IR brightness of the current outburst of Swift J1357.2-0933 (ATel #10297, #10314) has increased significantly over the past few days, and the source has become bluer in optical colors. SMARTS observations with the ANDICAM instrument on the 1.3m telescope at Cerro Tololo in Chile show the following: MJD V V-I 57869.161 16.58 +/- 0.03 0.85 +/- 0.04 57870.148 16.40 +/- 0.04 0.71 +/- 0.04 57871.207 16.26 +/- 0.04 0.63 +/- 0.05 Times are given for the start of 11 minute observation sequence. There is also a potential error of a few hundredths of a magnitude in the calibration of the field to the Landolt system. We will continue to obtain nightly observations (weather permitting) including infrared bands.