Title: High-speed photometry of the disintegrating planetesimals at 
       WD 1145+017: evidence for rapid dynamical evolution  
Authors: Gansicke B.T., Aungwerojwit A., Marsh .R., Dhillon V.S., Sahman D.I., 
         Veras D., Farihi J., Chote P., Ashley R., Arjyotha S., Rattanasoon S., 
         Littlefair .P., Pollacco D., Burleigh M.R. 
Table: Observation Log
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Byte-by-byte Description of file: datafile2.txt
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   Bytes Format Units Label     Explanations
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   1-  4 I4     ---   Obs.Y     Observation Year
   6-  7 I2     ---   Obs.M     Observation Month
   9- 10 I2     ---   Obs.D     Observation Day
  12- 24 A13    ---   Instr     Instrument/Telescope Used (1)
  26- 29 I4     ---   N         Number of Images obtained
  31- 34 F4.1   s     Exp       Individual Exposure time
  36- 40 F5.1   min   TExp      Total duration of observation
  42-209 A168   ---   Comments  Comments on observation
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Note (1): Instrument/Telescope Used
   TNT/ULTRASPEC = ULTRASPEC camera on the 2.4 m Thai National Telescope (TNT), Doi Inthanon
   W1m = Warwick 1 m telescope at the Roque de Los Muchachos Observatory,La Palma
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2015 11 28 TNT/ULTRASPEC  292  8.4  40.5 Mostly photometric with high humidity of 90-95 percent. Seeing ~2.0-2.5".                                                                                                
2015 11 29 TNT/ULTRASPEC 1130  8.4 158.1 Mostly photometric with high humidity of 90 percent. Seeing ~2.0-2.5".                                                                                                   
2015 11 30 TNT/ULTRASPEC 1516  8.4 160.8 Intermittent cirrus. Seeing ~2.5".                                                                                                                                       
2015 12 01 TNT/ULTRASPEC 1677  6.4 178.1 Patchy cirrus affecting the first half of the observations, poor data has been removed. Seeing started at ~3", improved to ~2" throughout the night.                     
2015 12 05 TNT/ULTRASPEC 9183  0.8 114.7 Mostly clear, with a little bit of cirrus here and there. Seeing ~2".                                                                                                    
2015 12 06 TNT/ULTRASPEC 1481  5.0 174.1 Lots of cirrus, particularly near the start. Seeing ~1.6"                                                                                                                
2015 12 07 TNT/ULTRASPEC  704  5.0  59.2 Intermittent cirrus. Seeing ~2"                                                                                                                                          
2015 12 09 TNT/ULTRASPEC 2053  5.0 172.6 Photometric. Seeing ~1.6-2.4".                                                                                                                                           
2015 12 10 TNT/ULTRASPEC 2259  5.0 190.0 Photometric. Seeing ~1.8-2.8".                                                                                                                                           
2015 12 11 TNT/ULTRASPEC 2783  5.0 234.1 Object at high airmass at start, so initial data is noisy. Photometric. Seeing 1.5-2.0".                                                                                 
2015 12 17 W1m            340 24.0 151.1 Light variable cloud passing through. Seeing, early in the night, was ~2 arcsec, by the end it was 1-1.4 arcsec. Some transparency variations.                           
2015 12 22 TNT/ULTRASPEC 1663  6.4 176.4 Seeing started out at 2", dropped to ~1.5" after a short while.                                                                                                          
2015 12 23 W1m            384 24.0 160.0 Clear. 3" seeing at first, but improving during the course of the night.                                                                                                 
2015 12 24 W1m            441 24.0 176.4 Clear. Seeing variable during the night from 2 arcsec at the beginning, reaching 2.8 arcsec from 22:00 to 01:00 UT and down again to 1.3 arcsec at the end of the night. 
2015 12 25 W1m            367 34.0 209.5 Some clouds at low altitude. Seeing variable during the night from 1 to 4 arcsecs.