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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"

37763 results found.

  1. GRB 081211B - possibly a short burst with extended emission
  2. GRB 081118: Zadko observations
  3. GRB 081215A: Gamma Repeater?
  4. GRB 0811215A: MASTER prompt optical observations
  5. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  6. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  7. Possible GRB 081211B: Swift/UVOT Upper Limits
  8. GRB 081213: Fermi GBM detection
  9. GRB 081210: optical observations
  10. Possible GRB 081211B - Swift-XRT analysis
  11. GRB 081207: Fermi GBM detection
  12. GRB 081209: Fermi GBM detection
  13. Fermi Gamma-ray Burst Monitor trigger 250533995 is not a GRB
  14. GRB 081007: Detection of a Supernova
  15. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  16. GRB 081210: Xinglong TNT R band Upper Limits
  17. GRB 081210, SMARTS optical/IR observations
  18. GRB 081211: Swift-BAT refined analysis
  19. GRB 081211: Swift XRT refined analysis
  20. GRB 081211: Swift/UVOT detection of an optical afterglow
  21. GRB 081211: Enhanced Swift-XRT position
  22. GRB 081210: Swift/UVOT refined analysis
  23. GRB 081211: Swift detection of a burst
  24. GRB 081210: Swift-XRT refined analysis
  25. GRB081203B: optical observations
  26. GRB 081210: Enhanced Swift-XRT position
  27. GRB 081210: Swift-BAT refined analysis
  28. GRB 081210: Swift detection of a burst with optical afterglow
  29. Konus-Wind observation of GRB 081209
  30. IPN triangulation of short hard GRB 081209
  31. GRB 081203A: optical observations
  32. GRB 081206C: Fermi GBM detection
  33. Radio observation of GRB 081121 with ATCA
  34. Radio observation of GRB 081118 with ATCA
  35. GRB 081206B: Fermi GBM detection
  36. GRB 081206: Fermi GBM detection
  37. GRB 081128: afterglow observations
  38. GRB 081203B: Suzaku WAM observation of the prompt emission
  39. GRB 081203B: Additional Gemini imaging
  40. Radio observation of GRB 081109 with ATCA
  41. Radio observation of GRB 081104 with ATCA
  42. Radio observation of GRB 081029 with ATCA
  43. Radio observation of GRB 081008 with ATCA
  44. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  45. GRB 081203B: Gemini observations
  46. GRB 081128: optical observation in CrAO
  47. GRB081203A: Optical observations at Ishigaki
  48. GRB 081128: Optical afterglow observations
  49. GRB 081204: GROND Observations
  50. GRB081203B: optical observations
  51. Radio detection of GRB 081203B with the VLA
  52. GRB 081204: Magellan observations
  53. GRB081203A: Radio upper limit at 15 GHz
  54. GRB 081204B: Fermi GBM detection
  55. GRB 081204: Swift/UVOT Upper Limits
  56. GRB 081204: Swift XRT afterglow confirmation
  57. GRB081203A: MITSuME optical observation
  58. GRB 081203A: Optical observations of Xinglong TNT telescope
  59. GRB 081203A: Skynet/GORT Detections
  60. GRB 081204: Swift XRT afterglow candidate
  61. GRB081203A: optical observation
  62. GRB 081204 : a long GRB localized by INTEGRAL
  63. VLA Radio upper limit on GRB 081203A
  64. Swift-XRT observations of GRB 081203B
  65. Konus-Wind observation of GRB 081203A
  66. Konus-Wind observation of GRB 081203B
  67. GRB081203A: Swift-XRT refined analysis
  68. GRB 081203B: optical observations
  69. GRB 081203B: SDSS upper limits at the position of the optical afterglow
  70. Swift/UVOT detection of GRB081203B
  71. GRB 081203B: Swift-XRT candidate afterglow.
  72. GRB 081203A: optical observations
  73. Swift UVOT observations of GRB 081203A
  74. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  75. GRB081203A: Swift/UVOT grism redshift
  76. GRB 081203A: Burst detection from Swift-BAT slew data
  77. GRB 081203A: Swift-BAT refined analysis
  78. GRB 081203: Enhanced Swift-XRT position
  79. GRB 081130B: MASTER prompt optical observations
  80. GRB081203: optical observation
  81. GRB 081203: Swift detection of a burst with a bright optical counterpart
  82. GRB 081128: optical observation
  83. GRB 081130B: Fermi GBM detection
  84. GRB 081130: Fermi GBM detection
  85. Swift Trigger 335971: Swift/UVOT Observations
  86. GRB 081126: afterglow photometry
  87. GRB 081126: Fermi GBM detection
  88. Fermi Gamma-ray Burst Monitor trigger 249166723 reclassification
  89. VLA Radio upper limit on GRB 081126
  90. GRB 081129: Fermi GBM detection
  91. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  92. GRB 081128A: optical observations
  93. Swift Trigger 335971 is probably not a real source
  94. Trigger 335971: Swift possible detection of a burst
  95. GRB081128: Swift/UVOT Upper Limits
  96. GRB 081122B: Fermi GBM Detection
  97. GRB 081128: Swift-XRT refined analysis
  98. GRB 081128: Liverpool Telescope afterglow confirmation
  99. GRB081128: optical observations
  100. GRB 081128: Swift-BAT refined analysis

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