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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"

16155 results found.

  1. GRB980519 optical observations
  2. GRB 980425 Radio Light Curve
  3. GRB 980425 Brightness Temperature
  4. SAX J0840.7+2248 Optical Observations
  5. GRB 980425 optical observations
  6. GRB980425: optical obs.
  7. GRB980425: Radio Observations
  8. GRB 980425 optical observations
  9. GRB 980425 optical observations
  10. GRB980326 X-ray Observations
  11. GRB980326, optical observations
  12. GRB980326, optical observations
  13. GRB980326 IPN annulus
  14. GRB980329
  15. GRB980329 Keck K-band observations
  16. GRB980329 IPN annulus
  17. GRB980329 optical observations
  18. GRB980329 optical observations
  19. GRB980329 infrared observations
  20. GRB980329 optical observations
  21. GRB980326 optical observations
  22. GRB980329 optical observations
  23. GRB980329 optical observations
  24. GRB980329 optical observations
  25. GRB980329 optical observations
  26. GRB980326 optical observations
  27. GRB980326 optical observations
  28. GRB980326 optical observations
  29. GRB980326 optical observations
  30. GRB970508 SAO RAS optical observations
  31. Optical Observations of GRB 970508
  32. GRB 971214: Redshift from Keck Observations
  33. Near-IR follow-up on GRB 971227
  34. GRB971214: Keck R & I-band Observations
  35. GRB 971227: Optical Observations
  36. Optical Observations of the GRB 971227 field
  37. Optical Observations on GRB 971227
  38. GRB971227: Plaskett R-band observations
  39. GRB 971227: Optical clarifications
  40. Optical Observations for GRB 971227
  41. GRB971227: Further CAHA R-band images
  42. GRB971227: LOTIS observations
  43. GRB 971227: Optical observations
  44. GRB971214: Optical Observations and Calibrations
  45. Sub-millimeter Observations of GRB 971214 at the JCMT
  46. GRB 971214: Redshift from Keck Optical Observations
  47. GRB 971214: Redshift from Keck Optical Observations
  48. GRB 971214: Apache Point Observatory Optical Observations
  49. GRB 971214: KPNO Optical Observations
  50. Optical Observations of GRB 971214 at Keck
  51. GRB 971214: Optical Observations
  52. GRB 971024: KPNO Optical Observations Summary
  53. GRB 971024: KPNO Optical Observations
  54. GRB 970828: Palomar Observations
  55. GRB 970228: Keck/LRIS Optical Observations

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