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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"

11539 results found.

  1. GRB 091003: WHT ACAM observations
  2. Konus-Wind observation of GRB 091003A
  3. GRB 090929A: Suzaku WAM observation of the prompt emission
  4. GRB 091003: Swift-XRT confirmation of fading afterglow
  5. GRB 091003: Swift/UVOT Detection of an Optical Afterglow
  6. GRB 091003: Skynet/DSO Observations
  7. GRB 091003: Swift UVOT Detection of a Candidate UV Afterglow
  8. GRB 091003: Swift XRT analysis
  9. GRB 091003A: Fermi LAT detection
  10. GRB 091003A: Fermi GBM detection
  11. GRB 090929A, Swift-BAT refined analysis
  12. Konus-Wind observation of GRB 090929A
  13. GRB 090927: Fermi GBM observation
  14. GRB 090926A: Fermi LAT and GBM refined analysis
  15. Konus-RF observation of GRB 090929A
  16. GRB 090929A BAT location of the Fermi GBM burst
  17. GRB 090929A: Fermi GBM detection
  18. GRB090926A: Swift-XRT refined analysis
  19. Konus-Wind and Konus-RF observations of GRB 090926A
  20. GRB 090926B: Fermi GBM detection
  21. GRB 090926A: Suzaku WAM observation of the prompt emission
  22. GRB090926A: Swift/UVOT observations
  23. GRB 090926A: Swift/UVOT detection of an optical afterglow
  24. GRB 090926A: Skynet/PROMPT Discovery of the Optical Afterglow
  25. GRB 090926: Fermi LAT detection
  26. GRB 090926: Fermi GBM detection
  27. GRB 090925: Fermi GBM detection
  28. GRB090922A: correction to Fermi location
  29. GRB 090922A: Fermi GBM detection
  30. GRB 090915: SARA detection of afterglow candidate
  31. GRB 090902B: Skynet/PROMPT Observations
  32. GRB 090915 Swift-BAT detection of a burst in ground analysis
  33. GRB 090910: Fermi GBM detection
  34. GRB 090904B: GROND detection of the optical afterglow
  35. GRB 090831A: Suzaku WAM observation of the prompt emission
  36. GRB 090902B: Suzaku WAM observation of the prompt emission
  37. GRB 090829A: Suzaku WAM observation of the prompt emission
  38. GRB 090904B: Fermi GBM detection
  39. GRB 090902B: ROTSE-III Detection of Optical Afterglow
  40. GRB 090902B: Swift/UVOT refined analysis
  41. GRB090902B: Swift XRT refined analysis
  42. GRB 090902B: Faulkes Telescope North observations
  43. GRB 090902B: GROND NIR Afterglow Observations
  44. GRB 090902B: Gemini-N absorption redshift
  45. GRB 090902B: Fermi LAT and GBM refined analysis.
  46. GRB 090902B: Optical afterglow candidate
  47. GRB090902B: Swift/UVOT observations
  48. GRB 090902B: Swift/XRT Afterglow Candidate
  49. GRB 090902B: Fermi LAT detection
  50. GRB 090902B: Fermi GBM detection of a bright burst
  51. GRB 090902: Fermi GBM detection
  52. GRB 090831A: IPN Triangulation
  53. GRB 090829B: Fermi GBM Detection
  54. GRB 090831: MAXI GSC detection
  55. GRB 090831: Fermi GBM detection
  56. GRB090829: Fermi GBM Detection
  57. GRB 090826: Fermi GBM detection
  58. GRB 090828: Fermi GBM detection
  59. Fermi Gamma-ray Burst Monitor trigger 273123112 is not a GRB
  60. GRB 090817 - TLS Observations
  61. GRB 090820: detection of a strong burst by RT-2 on board CORONAS PHOTON
  62. GRB 090820B: Fermi GBM detection
  63. GRB 090820: MASTER-Net optical polarization observations
  64. GRB 090820: Fermi GBM Detection of a bright burst.
  65. GRB 090817: Fermi GBM observation
  66. GRB 090813: Suzaku WAM observation of the prompt emission
  67. GRB 090815B: Fermi GBM detection
  68. GRB 090815: Fermi GBM detection
  69. Fermi Gamma-ray Burst Monitor trigger 271934815 is not a GRB
  70. GRB 090814C: Fermi GBM detection
  71. GRB 090813: Fermi GBM observation
  72. Fermi Gamma-ray Burst Monitor trigger 271446248 is not a GRB
  73. Fermi Gamma-ray Burst Monitor trigger 271833016 is not a GRB
  74. GRB 090807B: Fermi GBM detection
  75. GRB 090621B: MAGIC telescope GeV observation
  76. GRB 090621A: MAGIC telescope GeV observation
  77. GRB 090809B: Fermi GBM detection
  78. Fermi Gamma-ray Burst Monitor trigger 271275771 is not a GRB
  79. GRB 090802B: Fermi GBM detection
  80. GRB 090802: Fermi GBM detection
  81. GRB 090717A: Suzaku WAM observation of the prompt emission
  82. GRB 090711: Fermi GBM detection
  83. Konus-Wind and Konus-RF observations of GRB 090719
  84. Konus-RF and Konus-Wind observations of GRB 090718B
  85. Fermi Gamma-ray Burst Monitor triggers 269935914 through 270021937 are not GRBs
  86. Konus-Wind observations of bright hard GRB 090720B
  87. IPN Triangulation of bright GRB 090720B
  88. GRB 090720: Gemini-North Imaging and Optical Afterglow
  89. GRB 090720B: Fermi GBM detection
  90. Swift XRT and UVOT refned analysis of GRB 090720
  91. GRB 090720 Source found in ground processing of Swift-BAT data
  92. GRB 090717B: Fermi GBM detection
  93. GRB 090717: Fermi GBM detection
  94. GRB 090719: Fermi GBM detection
  95. GRB 090718B: Fermi GBM detection
  96. GRB 090718: Fermi GBM detection
  97. GRB 090720: Fermi GBM detection
  98. GRB090713 optical limit by "Pi of the Sky"
  99. GRB 090712: Fermi GBM observation
  100. GRB 090713: Fermi GBM detection

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