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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"

4252 results found.

  1. IPN localization of GRB991014 - CORRECTION
  2. IPN localization of GRB991014
  3. BATSE GRB trigger criteria
  4. GRB 990712 Late Optical Decay and Host Galaxy
  5. GRB 990712, Optical Observation
  6. GRB 990712
  7. IPN localization of GRB990705
  8. BeppoSAX NFI Observation of GRB990627 X-ray afterglow
  9. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  10. GRB 990510: optical observations
  11. GRB 990510: optical observations
  12. GRB990510: X-ray afterglow
  13. GRB 990510: optical observation
  14. GRB 990510: Broad Band Break
  15. GRB990510: optical observation
  16. GRB 990510 Optical Observations
  17. GRB 990510 optical observations
  18. GRB990510 optical observations
  19. GRB990510
  20. GRB 990510 optical observations
  21. GRB 990510 optical observations
  22. GRB 990510 optical observations
  23. IPN localization of GRB990510
  24. New IPN/RXTE error box for GRB990506
  25. GRB990308 not a new SGR
  26. GRB990308, Possible new SGR~0209+70
  27. GRB 990123: Discovery of the Probable Host Galaxy
  28. Possible identification of SN1999E with GRB980910
  29. GRB 981226: radio variable
  30. GRB 981226 Optical Observations
  31. GRB981226, sub-millimeter observations
  32. GRB 981226
  33. GRB 981226 optical observations
  34. Optical Observations of GRB981226
  35. GRB 981226 - Infrared Observations
  36. SGR1900+14, BeppoSAX-GRBM observations
  37. SGR1627-41
  38. SGR1627-41, RXTE/ASM observations
  39. Reduced error box of SGR 1627-41
  40. SGR 1627-41
  41. Discovery of a new SGR source, SGR1627-41
  42. GRB980613 observations from Palomar
  43. SGR 1900+14
  44. SGR1900+14
  45. SGR1900+14
  46. BATSE on-board GRB trigger change
  47. GRB980329 IPN annulus
  48. Optical Observations of GRB 970508
  49. IRAS 18119-1342 and the possible new SGR
  50. Possible new SGR from US Naval Observatory
  51. RXTE Observations of SGR 1814-13
  52. GRB 970828: Palomar Observations

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