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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.

Lucene Examples (click to copy):

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

45 results found.

  1. GRB 250129A: GRANDMA Continued Afterglow Detection
  2. GRB 250129A: ABObservatory SLOAN r’ afterglow detection
  3. GRB 250129A: Continued AbAO and Mondy optical observations
  4. GRB 250129A: Swift-BAT refined analysis
  5. GRB 250129A: LCO late afterglow detection
  6. GRB 250129A: AbAO AS-32 and Mondy AZT-33IK optical observations
  7. GRB 250129A: COLIBRÍ/DDRAGO Afterglow Detection
  8. GRB 250129a: Liverpool Telescope optical follow-up
  9. GRB 240129A: further SAO RAS optical observations
  10. GRB 250129A: 7DT Detection and Medium-band SED of Afterglow
  11. GRB 250129A: SVOM/C-GFT optical observations
  12. Swift GRB250129A: MASTER 4 days observations report
  13. Konus-Wind detection of GRB 250129A
  14. GRB 250129A: 1.3m DFOT Optical observations
  15. GRB 250129A: Liverpool Telescope observations suggest continued engine activity
  16. GRB 250129A: Skynet Continued Optical Observations
  17. GRB 250129A: Calapai Observatory, Massa S. Giorgio (Messina), optical observations
  18. GRB 250129A: SAO RAS optical observations
  19. GRB 250129A: COLIBRÍ Continuing Detection of the Afterglow
  20. GRB 250129A: optical photometry from Konkoly
  21. GRB 250129A: COLIBRÍ Optical Observations
  22. GRB 250129A: continued KAIT observations indicating steep decay after 28.5h
  23. GRB 250129A: iTelescope optical observation
  24. GRB 250129A: NOT optical observations of continuining activity
  25. GRB 250129a: Liverpool Telescope optical follow-up
  26. GRB 250129A: TNG NIR afterglow detection
  27. GRB 250129A: AKO Optical Afterglow Detection
  28. GRB 250129A: GRANDMA/TAROT optical afterglow detection
  29. GRB 250129A: Skynet optical observations
  30. GRB 250129A: KAIT optical observations of the rebrightening around 5.1 hours
  31. GRB 250129A: Swift-XRT refined Analysis
  32. GRB 250129A: Swift/UVOT Detection
  33. GRB 250129A: Enhanced Swift-XRT position
  34. GRB 250128B: NOT optical upper limit
  35. GRB 250129A: REM optical/NIR afterglow detection
  36. GRB 250129A: OHP/T193 optical and spectroscopy observations
  37. GRB 250129A: Early afterglow detection by LCO.
  38. Swift GRB 250129A: Global MASTER-Net Slowly evolving LC detection
  39. GRB 250129A: LCO optical observations
  40. GRB 250129A: NOT optical observations and redshift confirmation
  41. GRB 250129A: GOTO optical observations show brightening afterglow
  42. GRB 250129A: VLT/X-shooter redshift of z = 2.151
  43. Swift GRB 250129A: Global MASTER-Net observations report
  44. GRB 250129A: Swift detection of a burst with an optical counterpart
  45. Swift GRB 250129A: Global MASTER-Net OT detection

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