Night Report 2014-09-01

 Observers: Leonardo Tartaglia, Nancy Elias-Rosa

 Support: Enrico Cappellaro

 TAT on duty: Maria Teresa Botticella, Andrea Pastorello



 start: wind 13.0 m/s; temp. 8.7 C; humid. 29.9 % - Overcast.

 middle: wind 16.9 m/s; temp. 9.6 C; humid. 27.0 % - Cloudy.

 end: wind 16.1 m/s; temp. 10.4 C; humid. 24.1 % - Overcast.






 -- EFOSC2 bias, dome spec flats, arcs (impossible to do evening skyflats)


 Not observations tonight due to the bad weather.


Instructions for deep spectra of SN2013hx

The target is R=21.7, from imaging taken on 2014-08-25. It should be in the nebular phase, and dominated by emission lines. We expect to see [O I], [Ca II] and possibly H-alpha. But it is faint and at z=0.163, these lines are shifted into the dense night sky emission line region. We will attempt deep spectra, with 2D image subtraction. This just requires the object to be shifted, in X, along the slit in separate exposures. P2PP does not allow nodding along the slit for EFOSC2, so we need to do it manually. 

1800s at V=20.5 gave spectrum with reasonable S/N for LSQ14an, enough to detect the SN emission features. In the sky limited regime, we need 6 times longer to achieve comparable S/N. Hence 3hr total exposure required.  Always observe at PA. 

This will allow us to do 1-2 and 3-4 to give 2D sky subtracted images. This works well for other instruments. We haven't yet tried in PESSTO, but fairly sure it will work well. 

Only do if sky conditions are clear, seeing is <= 1.1", and dark sky conditions  If there is NO signal after the first 2700sec, then stop and abandon. You should see a faint trace in the 2700s individual exposures. 

Finder is linked on the wiki finder page.