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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

27921 results found.

  1. GRB 081222: Fermi GBM observation
  2. GRB 081222: Gemini-South absorption redshift
  3. GRB081222: Swift/UVOT further observations
  4. GRB 081221: Probable host galaxy in Keck imaging
  5. GRB 081204C: Fermi GBM detection
  6. GRB 081222, Swift-BAT refined analysis
  7. GRB 081221, Swift-BAT refined analysis
  8. GRB081222 optical limit by "Pi of the Sky"
  9. GRB 081222: Swift XRT refined analysis
  10. GRB081221: Fermi GBM observation
  11. Swift/UVOT observations of GRB 081221
  12. IPN triangulation of bright GRB 081215A
  13. GRB 081221: Swift-XRT Refined Analysis
  14. GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
  15. GRB 081221: Gemini-N nIR imaging
  16. GRB081222, optical observation
  17. GRB081222: Swift/UVOT detection of an optical afterglow
  18. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  19. GRB 081222: Swift detection of a burst with a bright optical afterglow
  20. GRB 081221: Enhanced Swift-XRT position
  21. GRB 081221: Swift detection of a burst
  22. GRB 081217: Fermi GBM detection
  23. Modification of Swift/UVOT response to bright GRBs
  24. GRB081215A: Fermi-LAT observations
  25. GRB 081211B: Further Swift-XRT analysis
  26. GRB 081215B: Fermi GBM detection
  27. GRB 081215A: Fermi GBM detection (correction to event fluence)
  28. GRB 081215A: Fermi GBM detection
  29. GRB 081211B - possibly a short burst with extended emission
  30. GRB 081118: Zadko observations
  31. Possible GRB 081211B: Swift/UVOT Upper Limits
  32. GRB 081213: Fermi GBM detection
  33. GRB 081210: optical observations
  34. Possible GRB 081211B - Swift-XRT analysis
  35. GRB 081207: Fermi GBM detection
  36. GRB 081209: Fermi GBM detection
  37. GRB 081007: Detection of a Supernova
  38. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  39. GRB 081211: Swift-BAT refined analysis
  40. GRB 081211: Swift XRT refined analysis
  41. GRB 081211: Swift/UVOT detection of an optical afterglow
  42. GRB 081211: Enhanced Swift-XRT position
  43. GRB 081210: Swift/UVOT refined analysis
  44. GRB 081211: Swift detection of a burst
  45. GRB 081210: Swift-XRT refined analysis
  46. GRB 081210: Enhanced Swift-XRT position
  47. GRB 081210: Swift-BAT refined analysis
  48. GRB 081210: Swift detection of a burst with optical afterglow
  49. IPN triangulation of short hard GRB 081209
  50. GRB 081206C: Fermi GBM detection
  51. Radio observation of GRB 081121 with ATCA
  52. GRB 081206B: Fermi GBM detection
  53. GRB 081206: Fermi GBM detection
  54. GRB 081128: afterglow observations
  55. GRB 081203B: Suzaku WAM observation of the prompt emission
  56. Radio observation of GRB 081029 with ATCA
  57. Radio observation of GRB 081008 with ATCA
  58. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  59. GRB 081128: optical observation in CrAO
  60. GRB 081128: Optical afterglow observations
  61. GRB 081204: GROND Observations
  62. Radio detection of GRB 081203B with the VLA
  63. GRB081203A: Radio upper limit at 15 GHz
  64. GRB 081204B: Fermi GBM detection
  65. GRB 081204: Swift/UVOT Upper Limits
  66. GRB 081204: Swift XRT afterglow confirmation
  67. GRB 081204: Swift XRT afterglow candidate
  68. Swift-XRT observations of GRB 081203B
  69. Konus-Wind observation of GRB 081203A
  70. Konus-Wind observation of GRB 081203B
  71. GRB081203A: Swift-XRT refined analysis
  72. GRB 081203B: optical observations
  73. Swift/UVOT detection of GRB081203B
  74. GRB 081203B: Swift-XRT candidate afterglow.
  75. GRB 081203A: optical observations
  76. Swift UVOT observations of GRB 081203A
  77. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  78. GRB081203A: Swift/UVOT grism redshift
  79. GRB 081203A: Burst detection from Swift-BAT slew data
  80. GRB 081203A: Swift-BAT refined analysis
  81. GRB 081203: Enhanced Swift-XRT position
  82. GRB081203: optical observation
  83. GRB 081203: Swift detection of a burst with a bright optical counterpart
  84. GRB 081128: optical observation
  85. GRB 081130B: Fermi GBM detection
  86. GRB 081130: Fermi GBM detection
  87. Swift Trigger 335971: Swift/UVOT Observations
  88. GRB 081126: Fermi GBM detection
  89. GRB 081129: Fermi GBM detection
  90. Swift Trigger 335971 is probably not a real source
  91. Trigger 335971: Swift possible detection of a burst
  92. GRB081128: Swift/UVOT Upper Limits
  93. SGR 1806-20: Fermi GBM detection.
  94. GRB 081122B: Fermi GBM Detection
  95. GRB 081128: Swift-XRT refined analysis
  96. GRB081128: optical observations
  97. GRB 081128: Swift-BAT refined analysis
  98. GRB 081128: Enhanced Swift-XRT position
  99. GRB 081128: Swift detection of a burst
  100. GRB 081126: Swift observations continuing

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