1160 transients classified by PESSTO so far
268 transients are being followed by PESSTO

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PESSTO SSDR3 Data Release has been published and is now available for download from the ESO Data Archive. The spectra can be accessed from here and the SOFI imaging data from here.

In four years of operations, PESSTO has taken spectra of 1168 distinct objects. From this list, 161 supernovae (10 of which are super-luminous supernovae), 2 supernova imposters, 3 Tidal Disruption Events, 1 unclassified objects and 1 AGN were picked as interesting science targets and these were scheduled for follow-up time series EFOSC2 optical spectroscopy, with the brightest also having SOFI spectra taken.

In total SSDR3 contains 21.29GB of data. In total there are 2851 EFOSC2 spectra released. These include 1753 EFOSC spectra of the 168 PESSTO Key Science targets which are chosen for detailed follow-up. The remaining 1098 EFOSC spectra relate to 1000 objects for which we took classification spectra but did not pursue a detailed follow-up campaign. 224 SOFI spectra where also taken of the Key Science targets.

Total number of science files released in the various formats is described in the table below.

The release descriptions for the data products can be found here and further information can be found in the ESO news archive.

From detailed download instructions please read our wiki article.

If you use these data in a publication, please add the following acknowledgement AND a citation to our PESSTO Survey paper, Smartt et al. 2015 A&A, 579, 40:

“This work is based (in part) on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere, Chile as part of PESSTO, (the Public ESO Spectroscopic Survey for Transient Objects Survey) ESO program 188.D-3003, 191.D-0935, 197.D-1075.”

PESSTO Special data release - nebular spectra of superluminous supernovae

The paper by Anders Jerkstrand et al. LONG-DURATION SUPERLUMINOUS SUPERNOVAE AT LATE TIMES, (Jerkstrand A. et al. The Astrophysical Journal, Volume 835, Issue 1, article id. 13, 23 pp. 2017), contains spectra from ESO (VLT + FORS2, VLT + Xshooter, NTT + EFOSC2) for three superluminous supernovae at late times. LSQ14an and SN2015bn/PS15ae were PESSTO follow-up targets.

Figure 7 of Jerkstrand et al. (2017):

There are various corrections applied to the spectra to scale them to photometry and to subtract off the host galaxy contributions. The paper includes photometry corrected and host galaxy subtracted spectra of SN2007bi using new photometry of the host that was not available at the time of the original publication in Gal-Yam et al. (2009, Natur.,
462, 624)

The scaling and corrections are described in the paper. Here we release the various spectra, including our calculated host galaxy spectra, and a detailed README file to describe each of the data products available.


When using these data, please cite the Jerkstrand et al. paper, and also (if using 2007bi data) the Gal-Yam et al. (2009) paper as the original data source.

The data are also available through WISeREP.

a few of the most recent PESSTO papers ...

LSQ14efd: observations of the cooling of a shock break-out event in a type Ic Supernova  Barbarino, C.; Botticella, M. T.; Dall'Ora, M. et al.
OGLE-2014-SN-131: A long-rising Type Ibn supernova from a massive progenitor  Karamehmetoglu, E.; Taddia, F.; Sollerman, J. et al.