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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"

26 results found.

  1. ZTF23aaoohpy/AT2023lcr: JWST spectroscopy confirmation of an associated type Ic-BL supernova
  2. ZTF23aaoohpy/AT2023lcr: JWST observations consistent with the presence of a supernova
  3. ZTF23aaoohpy/AT2023lcr : HCT follow-up observations
  4. ZTF23aaoohpy/AT2023lcr: AMI-LA radio detection
  5. AT2023lcr (ATLAS23msn/ZTF23aaoohpy): ALMA 100 GHz Detection
  6. ZTF23aaoohpy/AT2023lcr: LBT observations
  7. ZTF23aaoohpy /AT2023lcr: TNG NIR detection
  8. INTEGRAL upper limit on any GRB associated with ZTF23aaoohpy/AT2023lcr
  9. ZTF23aaoohpy/AT2023lcr: further SAO RAS observations
  10. ATLAS23msn/ZTF23aaoohpy/AT2023lcr: Zeiss-1000 of Koshka observatory optical observations
  11. ZTF23aaoohpy/AT2023lcr: SAO RAS observations
  12. AT2023lcr: VLA radio detection
  13. ZTF23aaoohpy/AT2023lcr: Montarrenti Observatory optical observations
  14. ZTF23aaoohpy (AT2023lcr/ATLAS23msn): Upper limits from Konus-Wind observations
  15. ZTF23aaoohpy (AT2023lcr/ATLAS23msn): Swift/UVOT detection
  16. ZTF23aaoohpy/AT2023lc: Mondy optical observations
  17. AT2023lcr: Neil Gehrels Swift Observatory X-ray detection
  18. AT2023lcr (ATLAS23msn/ZTF23aaoohpy): Kinder observations with Lulin observatory and a probable plateau in the g-band light curve
  19. AT2023lcr: Pan-STARRS & ATLAS Observations
  20. ZTF23aaoohpy/AT2023lcr: Keck/LRIS spectroscopy and redshift
  21. ZTF23aaoohpy/AT2023lcr: Xinglong-2.16m optical observations
  22. ZTF23aaoohpy/AT2023lcr: Liverpool Telescope detection
  23. ZTF23aaoohpy/AT2023lcr: OHP/T193 and OHP/T120 optical follow-up observations
  24. ZTF23aaoohpy/AT2023lcr: GROWTH-India Telescope follow-up observations
  25. ZTF23aaoohpy/AT2023lcr: GOTO early optical observations and constraint
  26. ZTF23aaoohpy/AT2023lcr: Zwicky Transient Facility discovery of a fast fading red transient

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Download all Circulars as a .tar.gz archive (updated once a day):
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