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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"

28038 results found.

  1. GRB 090820: Fermi GBM Detection of a bright burst.
  2. GRB 090817: optical upper limit
  3. GRB 090817: Confirmation of the X-ray afterglow
  4. GRB 090815C: Swift refined analysis
  5. GRB 090817: Fermi GBM observation
  6. GRB 090817: Swift/UVOT Upper Limits
  7. GRB 090812: Konus-Wind and Swift/BAT joint spectral analysis
  8. GRB 090817: Swift-XRT observations
  9. GRB 090814A: optical observations
  10. GRB 090813: Suzaku WAM observation of the prompt emission
  11. GRB 090812: Suzaku WAM observation of the prompt emission
  12. VLA radio non-detection of GRB 090812
  13. GRB 090815B: Fermi GBM detection
  14. GRB 090815: Fermi GBM detection
  15. GRB 090813: CrAO optical obsevations
  16. GRB090814A: NOT optical follow-ups
  17. GRB 090814B: Swift/UVOT Upper Limits
  18. GRB 090814B: Liverpool Telescope Observations
  19. GRB 090814C: Fermi GBM detection
  20. GRB 090814B: Swift-XRT detection of a possible afterglow.
  21. GRB 090814A: Swift/UVOT Observations
  22. GRB 090814A: Swift-XRT Team Refined Analysis
  23. GRB 090814A, RIMOTS optical upper limits
  24. GRB 090814A: Swift-BAT refined analysis
  25. GRB090814A: VLT spectroscopy
  26. GRB 090814: Enhanced Swift-XRT position
  27. GRB 090814: GROND Detection of an Optical Afterglow Candidate
  28. GRB 090814: Swift detection of a burst
  29. GRB 090813: Swift-XRT refined analysis
  30. GRB 090813, Swift-BAT refined analysis
  31. Konus-Wind observations of GRB090813
  32. GRB090813: Swift/UVOT upper limits
  33. GRB 090813: Enhanced Swift-XRT position
  34. GRB 090813: Liverpool Telescope afterglow confirmation
  35. GRB 090813: P60 Optical Afterglow Confirmation
  36. GRB 090813: Swift detection of a burst
  37. GRB 090812: Faulkes Telescope South Continued Optical Monitoring
  38. GRB 090812: RAPTOR detections during the burst
  39. GRB 090812: Swift XRT refined analysis
  40. GRB 090812, RIMOTS optical upper limits
  41. GRB 090812 Swift-BAT Refined Analysis
  42. GRB090812: Swift/UVOT observations
  43. GRB 090812: GROND Observations of the Optical/NIR Afterglow
  44. GRB 090812: Enhanced Swift-XRT position
  45. GRB 090812: P60 Confirmation of Optical Afterglow
  46. GRB 090812: Swift detection of a burst with an optical counterpart
  47. GRB 090807B: Fermi GBM detection
  48. GRB 090809: Further NOT optical observations
  49. VLA radio upper limit on GRB 090809
  50. GRB 090621B: MAGIC telescope GeV observation
  51. GRB 090621A: MAGIC telescope GeV observation
  52. GRB 090809: WHT observations
  53. GRB 090809B: Fermi GBM detection
  54. GRB 090809: Swift-XRT refined analysis
  55. GRB090809: Swift/UVOT observations
  56. GRB 090809: Enhanced Swift-XRT position
  57. GRB 090809: Swift-BAT refined analysis
  58. GRB 090809: afterglow confirmation at the NOT
  59. GRB 090809: Swift detection of a burst with a possible optical counterpart
  60. GRB 090807: Liverpool Telescope observations
  61. GRB 090807: MITSuME optical upper limit
  62. GRB 090807: Swift/UVOT Upper Limits
  63. GRB 090807: Swift-XRT refined analysis
  64. GRB 090807, Swift-BAT refined analysis
  65. GRB 090807: Enhanced Swift-XRT position
  66. GRB 090807, RIMOTS optical upper limits
  67. GRB 090807: Swift detection of a burst
  68. GRB 090802B: Fermi GBM detection
  69. GRB 090802: Fermi GBM detection
  70. GRB 090726: optical observation
  71. Swift trigger 358760 is probably a noise event
  72. GRB 090717A: Suzaku WAM observation of the prompt emission
  73. GRB 090709A : Quick look analysis of the Suzaku observation
  74. GRB 090728: Swift-BAT refined analysis
  75. GRB 090727: GRT Optical Observation
  76. GRB 090728: Swift XRT refined analysis
  77. GRB 090726: GRT Optical Observation
  78. GRB 090727: Swift/UVOT Upper Limits
  79. GRB 090728: Swift/UVOT Upper Limits
  80. GRB 090728: Enhanced Swift-XRT position
  81. GRB 090728, RIMOTS optical upper limits
  82. GRB 090728: Swift detection of a burst
  83. GRB 090727: Swift-BAT refined analysis
  84. GRB 090727: Swift-XRT refined analysis
  85. GRB 090727: Enhanced Swift-XRT position
  86. GRB 090715B: Late-time Lick 3m observations
  87. GRB 090727: Swift detection of a burst
  88. GRB090726: Swift/UVOT observations
  89. GRB 090726, Swift-BAT refined analysis
  90. GRB 090726: Afterglow candidate photometryfrom Crni Vrh
  91. GRB 090726: D50 optical observations
  92. GRB 090711: Fermi GBM detection
  93. GRB 090726: Swift-XRT Team refined analysis
  94. GRB 090726: Enhanced Swift-XRT position
  95. GRB 090726: optical transient candidate
  96. Konus-RF and Konus-Wind observations of GRB 090718B
  97. GRB 090720B: Fermi GBM detection
  98. Swift XRT and UVOT refned analysis of GRB 090720
  99. GRB 090709A: Swift XRT Timing Analysis
  100. GRB 090715B: VLA radio detection

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