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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"

11836 results found.

  1. Radio observation of GRB090926a with ATCA
  2. GRB 091010: Fermi GBM observation
  3. Detection of a short GRB 090929A by RT-2 Experiment
  4. RT-2 observation of the bright GRB 090926A
  5. GRB 091003A: Suzaku WAM observation of the prompt emission
  6. GRB 091003: Lick observations and possible SDSS host galaxy
  7. GRB 091003: WHT ACAM observations
  8. Konus-Wind observation of GRB 091003A
  9. GRB 090929A: Suzaku WAM observation of the prompt emission
  10. GRB 091003: Swift-XRT confirmation of fading afterglow
  11. GRB 091003: Swift/UVOT Detection of an Optical Afterglow
  12. GRB 091003: Skynet/DSO Observations
  13. GRB 091003: Swift UVOT Detection of a Candidate UV Afterglow
  14. GRB 091003: Swift XRT analysis
  15. GRB 091003A: Fermi LAT detection
  16. GRB 091003A: Fermi GBM detection
  17. GRB 090929A, Swift-BAT refined analysis
  18. Konus-Wind observation of GRB 090929A
  19. GRB 090927: Fermi GBM observation
  20. GRB 090926A: Fermi LAT and GBM refined analysis
  21. Konus-RF observation of GRB 090929A
  22. GRB 090929A BAT location of the Fermi GBM burst
  23. GRB 090929A: Fermi GBM detection
  24. GRB090926A: Swift-XRT refined analysis
  25. Konus-Wind and Konus-RF observations of GRB 090926A
  26. GRB 090926B: Fermi GBM detection
  27. GRB 090926A: Suzaku WAM observation of the prompt emission
  28. GRB090926A: Swift/UVOT observations
  29. GRB 090926A: Swift/UVOT detection of an optical afterglow
  30. GRB 090926A: Skynet/PROMPT Discovery of the Optical Afterglow
  31. GRB 090926: Fermi LAT detection
  32. GRB 090926: Fermi GBM detection
  33. GRB 090925: Fermi GBM detection
  34. GRB090922A: correction to Fermi location
  35. GRB 090922A: Fermi GBM detection
  36. GRB 090915: SARA detection of afterglow candidate
  37. GRB 090902B: Skynet/PROMPT Observations
  38. GRB 090915 Swift-BAT detection of a burst in ground analysis
  39. GRB 090910: Fermi GBM detection
  40. GRB 090831A: Suzaku WAM observation of the prompt emission
  41. GRB 090902B: Suzaku WAM observation of the prompt emission
  42. GRB 090829A: Suzaku WAM observation of the prompt emission
  43. GRB 090904B: Fermi GBM detection
  44. GRB 090902B: Swift/UVOT refined analysis
  45. GRB090902B: Swift XRT refined analysis
  46. GRB 090902B: Faulkes Telescope North observations
  47. GRB 090902B: GROND NIR Afterglow Observations
  48. GRB 090902B: Gemini-N absorption redshift
  49. GRB 090902B: Fermi LAT and GBM refined analysis.
  50. GRB 090902B: Optical afterglow candidate
  51. GRB090902B: Swift/UVOT observations
  52. GRB 090902B: Swift/XRT Afterglow Candidate
  53. GRB 090902B: Fermi LAT detection
  54. GRB 090902B: Fermi GBM detection of a bright burst
  55. GRB 090902: Fermi GBM detection
  56. GRB 090831A: IPN Triangulation
  57. GRB 090829B: Fermi GBM Detection
  58. GRB 090831: MAXI GSC detection
  59. GRB 090831: Fermi GBM detection
  60. GRB090829: Fermi GBM Detection
  61. GRB 090826: Fermi GBM detection
  62. GRB 090828: Fermi GBM detection
  63. Fermi Gamma-ray Burst Monitor trigger 273123112 is not a GRB
  64. GRB 090817 - TLS Observations
  65. GRB 090820: detection of a strong burst by RT-2 on board CORONAS PHOTON
  66. GRB 090820B: Fermi GBM detection
  67. GRB 090820: MASTER-Net optical polarization observations
  68. GRB 090820: Fermi GBM Detection of a bright burst.
  69. GRB 090817: Fermi GBM observation
  70. GRB 090813: Suzaku WAM observation of the prompt emission
  71. GRB 090815B: Fermi GBM detection
  72. GRB 090815: Fermi GBM detection
  73. Fermi Gamma-ray Burst Monitor trigger 271934815 is not a GRB
  74. GRB 090814C: Fermi GBM detection
  75. GRB 090813: Fermi GBM observation
  76. Fermi Gamma-ray Burst Monitor trigger 271446248 is not a GRB
  77. Fermi Gamma-ray Burst Monitor trigger 271833016 is not a GRB
  78. GRB 090807B: Fermi GBM detection
  79. GRB 090621B: MAGIC telescope GeV observation
  80. GRB 090621A: MAGIC telescope GeV observation
  81. GRB 090809B: Fermi GBM detection
  82. Fermi Gamma-ray Burst Monitor trigger 271275771 is not a GRB
  83. GRB 090802B: Fermi GBM detection
  84. GRB 090802: Fermi GBM detection
  85. GRB 090717A: Suzaku WAM observation of the prompt emission
  86. GRB 090711: Fermi GBM detection
  87. Konus-Wind and Konus-RF observations of GRB 090719
  88. Konus-RF and Konus-Wind observations of GRB 090718B
  89. Fermi Gamma-ray Burst Monitor triggers 269935914 through 270021937 are not GRBs
  90. Konus-Wind observations of bright hard GRB 090720B
  91. IPN Triangulation of bright GRB 090720B
  92. GRB 090720: Gemini-North Imaging and Optical Afterglow
  93. GRB 090720B: Fermi GBM detection
  94. Swift XRT and UVOT refned analysis of GRB 090720
  95. GRB 090720 Source found in ground processing of Swift-BAT data
  96. GRB 090717B: Fermi GBM detection
  97. GRB 090717: Fermi GBM detection
  98. GRB 090719: Fermi GBM detection
  99. GRB 090718B: Fermi GBM detection
  100. GRB 090718: Fermi GBM detection

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