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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').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

19 results found.

  1. LIGO/Virgo S200128d: Upper limits from Konus-Wind observations
  2. LIGO/Virgo S200128d: no counterpart candidate in SVOM/GWAC observations
  3. LIGO/Virgo S200128d : No significant candidates in FRAM - TAROT - GRANDMA observations
  4. LIGO/Virgo S200128d: upper limits from AGILE/GRID observations
  5. LIGO/Virgo S200128d: No counterpart candidates in Fermi-LAT observations
  6. LIGO/Virgo S200128d: Upper limits from CALET observations
  7. LIGO/Virgo S200128d: No counterpart candidates in KAIT observations
  8. Fermi-LAT ANTARES coincidence: IceCube neutrino search
  9. LIGO/Virgo S200128d: no counterpart candidates in the Swift/BAT observations
  10. Fermi-LAT ANTARES 200127.79 coincidence: MASTER alert observation and presence of young pulsar close to error-box
  11. LIGO/Virgo S200128d: Upper limits from Fermi-GBM Observations
  12. Fermi-LAT-ANTARES coincidence
  13. LIGO/Virgo S200128d : no neutrino counterpart candidate in ANTARES search
  14. LIGO/Virgo S200128d: Coverage and upper limits from MAXI/GSC observations
  15. LIGO/Virgo S200128d: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  16. LIGO/Virgo S200128d: No counterpart candidates in HAWC observations
  17. LIGO/Virgo S200128d: Identification of a GW compact binary merger candidate
  18. LIGO/Virgo S200128d: Upper limits from IceCube neutrino searches
  19. LIGO/Virgo S200128d: Global MASTER-Net observations report

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Download all Circulars as a .tar.gz archive:
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