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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"

17851 results found.

  1. GRB 980703: ASM Position & Intensity
  2. GRB980703 optical followup
  3. Radio observations of SGRs
  4. SGR1900+14 field optical observations
  5. GRB 980613: Optical transient and its host galaxy
  6. GRB 980613: Detection of the probable host galaxy
  7. GRB 980613 Optical Observations
  8. GRB 980613 optical observations
  9. Discovery of a new SGR source, SGR1627-41
  10. GRB980613 Optical Observations
  11. GRB980613 observations from Palomar
  12. GRB980613 BeppoSAX-NFI follow up
  13. GRB980613 Near Infra-Red Observations
  14. GRB971214 Secondary Standards
  15. GRB980519 Secondary Standards
  16. GRB 980519 Optical Observations
  17. GRB 980519
  18. GRB980519 optical observations
  19. GRB 980519 Optical Observations
  20. GRB970519, optical follow-up at Schmidt Calern
  21. GRB980519 Optical Observations
  22. GRB 980519 Optical Observations
  23. GRB980515, BeppoSAX IAUC to be submitted
  24. BSAX Observations of GRB980425 field
  25. SAX J0840.7+2248 Optical Observations
  26. GRB980425: optical obs.
  27. GRB980425: Radio Observations
  28. report on BSAX observations of GRB980425
  29. GRB 980329 ROSAT observation
  30. GRB980326 X-ray Observations
  31. GRB980326, optical observations
  32. GRB980326, optical observations
  33. GRB980329 Keck K-band observations
  34. GRB980326 optical observations
  35. GRB980329 optical observations
  36. GRB980329 VLA observations
  37. GRB980329 optical observations
  38. GRB980326 optical observations
  39. Optical Observations of GRB 970508
  40. Near-IR follow-up on GRB 971227
  41. Optical Observations of the GRB 971227 field
  42. Optical Observations on GRB 971227
  43. GRB971227: Plaskett R-band observations
  44. GRB 971227: Optical clarifications
  45. GRB971227: Further CAHA R-band images
  46. GRB971227: LOTIS observations
  47. GRB971214: Optical Observations and Calibrations
  48. GRB 971214: Optical Observations
  49. Radio Observations of GRB 971214 at the VLA
  50. GRB 971024: KPNO Optical Observations
  51. GRB 970828: Palomar Observations

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