Jul 12 – 23, 2021
Europe/Berlin timezone

Fermi-LAT realtime follow-ups of high-energy neutrino alerts

Jul 12, 2021, 6:00 PM
1h 30m


Talk MM | Multi-Messenger Discussion


Simone Garrappa (DESY Zeuthen)


The detection of the flaring gamma-ray blazar TXS 0506+056 in spatial and temporal coincidence with the high-energy neutrino IC-170922A represents a milestone for multi-messenger astronomy. The prompt multi-wavelength coverage from several ground- and space-based facilities of this special event was enabled thanks to the key role of the Fermi-Large Area Telescope (LAT), continuously monitoring the gamma-ray sky. Exceptional variable and transient events, such as bright gamma-ray flares of blazars, are regularly reported to the whole astronomical community to enable prompt multi-wavelength observations of the astrophysical sources. As soon as real-time IceCube high-energy neutrino event alerts are received, the relevant positions are searched, at multiple timescales, for gamma-ray activity from known sources and newly detected emitters positionally consistent with the neutrino localization.
In this contribution, we present an overview of follow-up activities and strategies for the real-time neutrino alerts with the Fermi-LAT, focusing on some interesting observed coincidences with gamma-ray sources. We will also discuss future plans and improvements in the strategies for the identification of gamma-ray counterparts of single high-energy neutrinos.


gamma-rays; neutrinos; AGN; blazars;

Collaboration Ferrmi-LAT
Subcategory Experimental Results

Primary author

Simone Garrappa (DESY Zeuthen)


Sara Buson (JMU Wuerzburg) Anna Franckowiak (DESY Zeuthen - RU Bochum) Marcello Giroletti (IRA-INAF) Dr Ioannis Liodakis (Finnish Center for Astronomy with ESO) Cristina Nanci (IRA-INAF)

Presentation materials