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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"

4169 results found.

  1. GRB000528: BeppoSAX GRBM observations
  2. GRB000419 [IPN Position]
  3. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  4. GRB 000326: Optical Observations
  5. GRB 000301C, Optical Observation
  6. GRB000301C
  7. GRB 000301C : Optical Candidate
  8. GRB000226 [IPN Position]
  9. HST Observations of GRB 990712
  10. IPN annulus for GRB000214
  11. GRB000126, optical observations
  12. IPN localization of GRB000126
  13. GRB991216 late optical observation
  14. BEPPOSAX GRBM Localization of GRB991226
  15. IPN error boxes for GRB991229
  16. IPN localization of GRB991226
  17. IPN localization of GRB991208
  18. IPN localization of GRB991014 - CORRECTION
  19. IPN localization of GRB991014
  20. BATSE GRB trigger criteria
  21. GRB 990712 Late Optical Decay and Host Galaxy
  22. GRB 990712, Optical Observation
  23. GRB 990712
  24. IPN localization of GRB990705
  25. BeppoSAX NFI Observation of GRB990627 X-ray afterglow
  26. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  27. GRB 990510: optical observations
  28. GRB 990510: optical observations
  29. GRB990510: X-ray afterglow
  30. GRB 990510: optical observation
  31. GRB 990510: Broad Band Break
  32. GRB990510: optical observation
  33. GRB 990510 Optical Observations
  34. GRB 990510 optical observations
  35. GRB990510 optical observations
  36. GRB990510
  37. GRB 990510 optical observations
  38. GRB 990510 optical observations
  39. GRB 990510 optical observations
  40. IPN localization of GRB990510
  41. New IPN/RXTE error box for GRB990506
  42. GRB990308 not a new SGR
  43. GRB990308, Possible new SGR~0209+70
  44. GRB 990123: Discovery of the Probable Host Galaxy
  45. Possible identification of SN1999E with GRB980910
  46. GRB 981226: radio variable
  47. GRB 981226 Optical Observations
  48. GRB981226, sub-millimeter observations
  49. GRB 981226
  50. GRB 981226 optical observations
  51. Optical Observations of GRB981226
  52. GRB 981226 - Infrared Observations
  53. SGR1900+14, BeppoSAX-GRBM observations
  54. SGR1627-41
  55. SGR1627-41, RXTE/ASM observations
  56. Reduced error box of SGR 1627-41
  57. SGR 1627-41
  58. Discovery of a new SGR source, SGR1627-41
  59. GRB980613 observations from Palomar
  60. SGR 1900+14
  61. SGR1900+14
  62. SGR1900+14
  63. BATSE on-board GRB trigger change
  64. GRB980329 IPN annulus
  65. Optical Observations of GRB 970508
  66. IRAS 18119-1342 and the possible new SGR
  67. Possible new SGR from US Naval Observatory
  68. RXTE Observations of SGR 1814-13
  69. GRB 970828: Palomar Observations

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