[vsnet-alert 10197] Variable in NGC 300

B Monard bmonard at mweb.co.za
Sun May 18 16:04:05 JST 2008


I was able to make some filtered observations of the transient just before dawn, incl a calibration sequence for V-I-R based on a calibrated field just South of the galaxy..

Var in NGC 300   20080518.16   14.62 V
Var in NGC 300   20080518.16   14.30 R
Var in NGC 300   20080518.16   13.82 I

These magnitudes tell that the transient is not as red as expected. 

For those that like to follow up with filtered photometry, a good reference star to use is at 00 55 06.47 -37 42 58.2 with V=13.71, R=13.40, I=13.10. The uncertainties are estimated to be around 0.03 for each. 

In view of the new sequence my earlier reported values of 14.2 (unfiltered CCD) would become 14.3 (as based on red zeropoint). Therefore no change in the (unfiltered CCD) brightness of the transient since May 14.16 .


Berto Monard
CBA Pretoria / Bronberg Observatory

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