Skip to main content
Announcing GCN Classic Migration Survey, End of Legacy Circulars Email. See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').

17 results found.

  1. LIGO/Virgo S190503bf: Gaia Photometric Alerts transient candidate
  2. LIGO/Virgo S190503bf: Gaia Photometric Alerts transient candidate
  3. LIGO/Virgo S190503bf: TAROT-GRANDMA observation report
  4. LIGO/Virgo S190503bf: AstroSat CZTI upper limits
  5. LIGO/Virgo S190503bf: CALET Observations
  6. LIGO/Virgo S190503bf Global MASTER-Net observations report
  7. LIGO/Virgo S190503bf: Swift/BAT Counterpart Search
  8. LIGO/Virgo S190503bf: Fermi-LAT search for a high-energy gamma-ray counterpart
  9. LIGO/Virgo S190503bf: Insight-HXMT/HE observation
  10. LIGO/Virgo S190503bf: ANTARES neutrino search
  11. LIGO/Virgo S190503bf: Fermi-GBM Observations
  12. LIGO/Virgo S190503bf: MAXI/GSC Observations
  13. LIGO/Virgo S190503bf: AGILE-GRID Observations
  14. LIGO/Virgo S190503bf: INTEGRAL prompt observation
  15. LIGO/Virgo S190503bf: AGILE MCAL observations
  16. LIGO/Virgo S190503bf: Identification of a GW compact binary merger candidate
  17. LIGO/Virgo S190503bf: IceCube Neutrino Search

Advanced

Download all Circulars as a .tar.gz archive:
Looking for U.S. government information and services? Visit USA.gov