To properly process data (either imaging or multi-slit spectra) from the OSIRIS instrument at GTC you need first to convert the original data to single images. The raw fits data contain two extensions corresponding to the two CCD sensors. To combine these into a single 2110 X 2051 pixels image …
IRAF has become lately available through Debian‘s repositories. So I was curious to see how it works. But I was missing the right moment. About a month ago, I finally found the proper motivation so I went on to install it. As always … there were a few, minor, problems. …
During the last few days I have struggled a bit with the wavelength calibration of some long-slit spectra. When using the identify task of IRAF I found that I could select (“m”ark) only some of the lines, without any clear indication why the rest were not recognized (some were indeed …
Between 12 to 19 of September 2016, we organized the Ondřejov Summer School 2016, which was held at the Stellar Stellar Department of the Astronomical Institute (Czech Academy of Sciences), in Ondřejov. The main aim of the school was to provide students hands-on experience with real observational data, i.e. to …
I have been working lately with IRAF/daophot with the PyRAF environment in a 32bit machine and everything is smooth except for the fact that it takes many hours to finish the run in each field I examine. As I would like to finish this analysis as soon as possible I …
Does it seams that IRAF is getting too much time to start? And if it starts do you see cannot access host ‘iraf.noao.edu:80’ ? If yes, then if you also try iraf.noao.edu then you will notice that it does take too much time to open (if…it opens!). So, in this …
Among the simplest installation methods to install IRAF are SciSoft (for RedHat/Fedora based distributions) and Fernando Avila Castro iso files (for Ubuntu/Debian based distributions). However, both require root privileges. What can you do when you do not have these permissions? Ureka [1] comes in rescue! It is easy to install …
After a long time I finally managed to understand how to use IRAF’s sbands, along with a standard star and a filter. 1. If you want to use a spectrum from the standard star library of IRAF, you have to convert it from a .dat file to an image file …
After having looked and searched into the whole IRAF/PyRAF directory to point out the directory that contains the template spectra for the stsdas/synphot package it was just a matter of a quick look at the front page of the package to resolve the issue! As it is said: “Since the …
While doing photometry in some rather large images with DAOPHOT, the allstar I experienced a panic from IRAF: PANIC in `/iraf/iraf/noao/bin.linux/x_daophot.e’: Memory has been corrupted By googling the exact error I hit on this post in iraf.net (#136679) where the problem presented was exactly the same. The solution is simple …