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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"

24845 results found.

  1. GRB980519 optical observations
  2. GRB 980519 Optical Observations
  3. GRB980519 BATSE Observations
  4. GRB980519 Optical Observations
  5. GRB980519 Optical Observations
  6. GRB 980519 Optical Observations
  7. GRB980515, BeppoSAX IAUC to be submitted
  8. BSAX Observations of GRB980425 field
  9. IPN web site of GRBs
  10. GRB980425 BATSE observations
  11. SAX J0840.7+2248 Optical Observations
  12. GRB980425: optical obs.
  13. GRB980425: Radio Observations
  14. report on BSAX observations of GRB980425
  15. GRB 980329 ROSAT observation
  16. GRB980326 X-ray Observations
  17. GRB980326, optical observations
  18. GRB980326, optical observations
  19. GRB980329, Fading IR counterpart to radio source
  20. GRB980329 Keck K-band observations
  21. GRB980329 sub-millimeter observations
  22. GRB980329 optical observations
  23. GRB980329 near-IR observations
  24. GRB980329 near-IR observations
  25. GRB980326 optical observations
  26. GRB980329 optical observations
  27. GRB980329 VLA observations
  28. GRB980329 optical observations
  29. GRB980329 optical observations
  30. GRB980326 optical observations
  31. GRB980326 optical observations
  32. Optical Observations of GRB 970508
  33. Near-IR follow-up on GRB 971227
  34. Optical Observations of the GRB 971227 field
  35. Optical Observations on GRB 971227
  36. GRB971227: Plaskett R-band observations
  37. GRB 971227: Optical clarifications
  38. GRB971227: Further CAHA R-band images
  39. GRB971227: LOTIS observations
  40. GRB971214: Optical Observations and Calibrations
  41. GRB 971214: Optical Observations
  42. Radio Observations of GRB 971214 at the VLA
  43. GRB 971024: Refined analysis by USNOFS Observations
  44. GRB 971024: KPNO Optical Observations
  45. GRB 970828: Palomar Observations

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