Supernova classifications made easy

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Easy Supernova classifications for everyone and everywhere.

GELATO (GEneric cLAssification TOol) is a software for objective classification of Supernovae spectra. GELATO is available to anyone for free and can be accessed from anywhere. No specialised software, additional resources or installation is needed. Any standard browser on any operating system will do it!

The new version of GELATO (v.2.0 Fiordilatte) has an entirely redesigned new responsive UI, as well as a bunch of improvements under the hood, including:
  • new and enriched templates database
  • additional spectral noise filtering algorithms
  • support for ASCII format input spectra
  • options to narrow down the classification templates set
  • "basic" and "advanced" modes
  • user password recovery function
Note to the users of the previous version of GELATO: you do not need to sign up for the new GELATO, neither take any other action in order to continue using it. Moreover, if you have set your browser to remember your usernames and passwords, your GELATO username and password should already be autofilled in the sign in form above.

GELATO performs an automatic comparison of a given (input) spectrum with its database of well-studied SN spectra (templates), in order to find the templates that are most similar to the input one. After the comparison process the user is provided with the best matching templates and their characteristics (SN type, phase, etc), that objectively classify the input spectrum. To make it even easier, GELATO provides comparison plots of the input spectrum and templates.

GELATO has responsive UI which provides optimal user experience on mobile devices too!

Please take into account that the classification results provide optional comparison plots of spectra, and GELATO does its best to render the plots usable even for the reduced screen sizes of smartphones. Nevertheless, you may find challenging viewing spectra on a small screen, so please try and decide yourself.

Some mobile devices (in particular iOS based ones) by default do not allow direct user access to the file system and consequently file uploads to web services through standard web browsers. As GELATO requires you to upload your SN spectrum in order to classify it, it cannot be used on these devices, unless additional third party applications are installed to bypass the operating system's native behaviour.

GELATO templates are hand-picked SN spectra of all SNe types, spanning a wide range of characteristics and SN evolution phases. Only spectra of very well studied SNe are chosen and visually examined one by one.
The templates database is continuously growing with new additions, and these updates are immidiately available to all GELATO users!

GELATO cares about your privacy! The email address requested to sign you up is used only to provide you access to GELATO and help you to reset your password if you need it one day. Your email address will not be used for anything else, neither will it be shared to third parties. According to the Spanish personal data privacy law (the TNG is located in Spain), you can, at any moment, request that GELATO deletes your email address.
GELATO removes all your session data, including your spectrum, at the exact moment when you sign out clicking any of the "Sign out" links available throughout your session. If you do not sign out, your session stays active for 6 hours after your last classification and you can resume using GELATO without signing in. GELATO does this to offer you more flexibility. After 6 hours your session is closed and all related session data are automatically removed by a specially designed routine procedure.

GELATO is developed by Avet Harutyunyan and Padova-Asiago Supernova Group and is based on the algorithm descibed in Harutyunyan et al., 2008, A&A, 488, 383. GELATO is hosted by the Telescopio Nazionale Galileo.
GELATO is offered "as-is". No warranty of any kind is expressed or implied. However, if your work benefits from using GELATO, please aknowledge it by a reference to Harutyunyan et al., 2008, A&A, 488, 383 and a link to GELATO (

Please contact for any kind of GELATO related question or problem report. Of course, your comments and suggestions are also welcome!