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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"

32545 results found.

  1. GRB980519 Optical Observations
  2. GRB 980519 Optical Observations
  3. GRB980519 optical observations
  4. GRB980515, BeppoSAX IAUC to be submitted
  5. GRB980519, BeppoSAX-WFC updated position
  6. GRB 980425 Radio Light Curve
  7. GRB 980425 Brightness Temperature
  8. BSAX Observations of GRB980425 field
  9. IPN web site of GRBs
  10. GRB980425 BATSE observations
  11. SAX J0840.7+2248 Optical Observations
  12. GRB 980425 optical observations
  13. GRB980425: optical obs.
  14. GRB980425: Radio Observations
  15. GRB 980425 optical observations
  16. GRB980326, optical observations
  17. GRB980326, optical observations
  18. GRB980329, Fading IR counterpart to radio source
  19. GRByymmdd, Announcement of automation
  20. GRB980326 IPN annulus
  21. GRB980329
  22. GRB980329 Keck K-band observations
  23. GRB980329 sub-millimeter observations
  24. GRB980329 IPN annulus
  25. GRB980329 optical observations
  26. GRB980329 near-IR observations
  27. GRB980329 optical observations
  28. GRB980326 optical observations
  29. GRB980326 optical observations
  30. GRB970508 SAO RAS optical observations
  31. GRB 971214: Redshift from Keck Observations
  32. Near-IR follow-up on GRB 971227
  33. GRB971214: Keck R & I-band Observations
  34. GRB 971227: Optical Observations
  35. Optical Observations of the GRB 971227 field
  36. GRB971227: Plaskett R-band observations
  37. GRB 971227: Optical clarifications
  38. GRB971227: LOTIS observations
  39. GRB971214: Optical Observations and Calibrations
  40. Optical Observations of GRB 971214 at Keck
  41. GRB 971024: Refined analysis by USNOFS Observations
  42. GRB 971024: USNO Observations
  43. GRB 970925: BATSE Localization
  44. IRAS 18119-1342 and the possible new SGR
  45. GRB 970228: Keck/LRIS Optical Observations

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