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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"

11100 results found.

  1. GRB 100225A: Fermi LAT detection
  2. GRB 100225A: Fermi GBM detection
  3. GRB 100223A: Fermi GBM detection
  4. GRB 100218A : Fermi GBM detection
  5. GRB 100216A Short, hard GRB detected in ground analysis of Swift-BAT data
  6. GRB 100212A: Fermi GBM detection
  7. GRB 100205B: Fermi GBM detection
  8. GRB 100131A: MASTER-Net optical alert observations
  9. GRB 100206A: Fermi GBM observation
  10. GRB 100130B: Fermi GBM detection
  11. GRB 100113A: Fermi GBM detection
  12. GRB 100131A: Suzaku WAM observation of the prompt emission
  13. GRB 100131A: Fermi GBM detection
  14. GRB 100122A: Fermi GBM detection
  15. GRB 100122A: MASTER-Net optical observations
  16. GRB 100116A: Suzaku WAM observation of the prompt emission
  17. Konus-Wind observation of GRB 100116A
  18. GRB 100117A: Fermi GBM detection
  19. GRB 100116A: Fermi LAT detection
  20. GRB 100116A: Fermi GBM detection
  21. GRB 100111A: Fermi GBM observation
  22. GRB 091221: Fermi GBM Observation
  23. GRB 091208B: Fermi GBM observation
  24. GRB 091123: Suzaku WAM observation of the prompt emission
  25. GRB 091126A: Suzaku WAM observation of the prompt emission
  26. Konus-Wind observation of very long GRB 091123
  27. GRB 091123: Fermi GBM detection of a very long burst
  28. GRB 091126B: Fermi GBM detection
  29. GRB 091127: Suzaku WAM observation of the prompt emission
  30. GRB 091126: Fermi GBM detection
  31. GRB 091128: Fermi GBM detection
  32. GRB 091127: Fermi GBM detection
  33. IPN Triangulation of GRB091120
  34. Konus-Wind observation of GRB 091120
  35. GRB 091120: MAXI GSC detection
  36. GRB 091120: Fermi GBM observation
  37. GRB 091112: Suzaku WAM observation of the prompt emission
  38. GRB 091102A: Suzaku WAM observation of the prompt emission
  39. Konus-Wind and Konus-RF observations of GRB 091031
  40. GRB 091112: Fermi GBM observation
  41. GRB 091031: Fermi LAT detection of a faint burst
  42. GRB 091030: Fermi GBM detection
  43. Fermi LAT Upper Limits on GRB 091010
  44. GRB 091102A: Fermi GBM observation
  45. GRB 091031: Fermi GBM detection
  46. GRB 091024: Fermi LAT upper limits
  47. Fermi Gamma-ray Burst Monitor trigger 091028818 is not a GRB
  48. GRB 091020: Fermi GBM observation
  49. GRB 091024: Burst was outside the Swift-BAT FOV after T0(BAT)+460sec
  50. Konus-Wind and Konus-RF observations of GRB 091024
  51. GRB 091024: TLS Upper Limit
  52. GRB 091024: Fermi GBM Observations
  53. GRB 090926A: Late-time Gemini South Observations and Possible Jet Break
  54. GRB 091003: Gemini-N redshift of possible host galaxy
  55. GRB 091010: Suzaku WAM observation of the prompt emission
  56. Radio observation of GRB090926a with ATCA
  57. GRB 091010: Fermi GBM observation
  58. Detection of a short GRB 090929A by RT-2 Experiment
  59. RT-2 observation of the bright GRB 090926A
  60. GRB 091003A: Suzaku WAM observation of the prompt emission
  61. GRB 091003: Lick observations and possible SDSS host galaxy
  62. GRB 091003: WHT ACAM observations
  63. Konus-Wind observation of GRB 091003A
  64. GRB 090929A: Suzaku WAM observation of the prompt emission
  65. GRB 091003: Swift-XRT confirmation of fading afterglow
  66. GRB 091003: Swift/UVOT Detection of an Optical Afterglow
  67. GRB 091003: Skynet/DSO Observations
  68. GRB 091003: Swift UVOT Detection of a Candidate UV Afterglow
  69. GRB 091003: Swift XRT analysis
  70. GRB 091003A: Fermi LAT detection
  71. GRB 091003A: Fermi GBM detection
  72. GRB 090929A, Swift-BAT refined analysis
  73. Konus-Wind observation of GRB 090929A
  74. GRB 090927: Fermi GBM observation
  75. GRB 090926A: Fermi LAT and GBM refined analysis
  76. Konus-RF observation of GRB 090929A
  77. GRB 090929A BAT location of the Fermi GBM burst
  78. GRB 090929A: Fermi GBM detection
  79. GRB090926A: Swift-XRT refined analysis
  80. Konus-Wind and Konus-RF observations of GRB 090926A
  81. GRB 090926B: Fermi GBM detection
  82. GRB 090926A: Suzaku WAM observation of the prompt emission
  83. GRB090926A: Swift/UVOT observations
  84. GRB 090926A: Swift/UVOT detection of an optical afterglow
  85. GRB 090926A: Skynet/PROMPT Discovery of the Optical Afterglow
  86. GRB 090926: Fermi LAT detection
  87. GRB 090926: Fermi GBM detection
  88. GRB 090925: Fermi GBM detection
  89. GRB090922A: correction to Fermi location
  90. GRB 090922A: Fermi GBM detection
  91. GRB 090915: SARA detection of afterglow candidate
  92. GRB 090902B: Skynet/PROMPT Observations
  93. GRB 090915 Swift-BAT detection of a burst in ground analysis
  94. GRB 090910: Fermi GBM detection
  95. GRB 090904B: GROND detection of the optical afterglow
  96. GRB 090831A: Suzaku WAM observation of the prompt emission
  97. GRB 090902B: Suzaku WAM observation of the prompt emission
  98. GRB 090829A: Suzaku WAM observation of the prompt emission
  99. GRB 090904B: Fermi GBM detection
  100. GRB 090902B: ROTSE-III Detection of Optical Afterglow

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