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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"

27408 results found.

  1. GRB081222, optical observation
  2. GRB081222: Swift/UVOT detection of an optical afterglow
  3. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  4. GRB 081222: Swift detection of a burst with a bright optical afterglow
  5. GRB 081221: Swift detection of a burst
  6. GRB 081217: Fermi GBM detection
  7. Modification of Swift/UVOT response to bright GRBs
  8. GRB 081211B: Further Swift-XRT analysis
  9. GRB 081215B: Fermi GBM detection
  10. GRB 081216: Suzaku WAM observation of the prompt emission
  11. GRB 081216 : Fermi GBM observation
  12. GRB 081215A: Fermi GBM detection
  13. IPN localization of short hard GRB 081216
  14. GRB 081211B - possibly a short burst with extended emission
  15. GRB 081118: Zadko observations
  16. Possible GRB 081211B: Swift/UVOT Upper Limits
  17. GRB 081213: Fermi GBM detection
  18. Possible GRB 081211B - Swift-XRT analysis
  19. GRB 081207: Fermi GBM detection
  20. GRB 081209: Fermi GBM detection
  21. Fermi Gamma-ray Burst Monitor trigger 250533995 is not a GRB
  22. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  23. GRB 081211: Swift-BAT refined analysis
  24. GRB 081211: Swift XRT refined analysis
  25. GRB 081211: Swift/UVOT detection of an optical afterglow
  26. GRB 081210: Swift/UVOT refined analysis
  27. GRB 081211: Swift detection of a burst
  28. GRB 081210: Swift-XRT refined analysis
  29. GRB 081210: Swift-BAT refined analysis
  30. GRB 081210: Swift detection of a burst with optical afterglow
  31. Konus-Wind observation of GRB 081209
  32. IPN triangulation of short hard GRB 081209
  33. GRB 081206C: Fermi GBM detection
  34. GRB 081206B: Fermi GBM detection
  35. GRB 081206: Fermi GBM detection
  36. GRB 081203B: Suzaku WAM observation of the prompt emission
  37. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  38. GRB081203A: Optical observations at Ishigaki
  39. GRB 081204: GROND Observations
  40. GRB 081204B: Fermi GBM detection
  41. GRB 081204: Swift XRT afterglow confirmation
  42. GRB081203A: MITSuME optical observation
  43. GRB 081203A: Skynet/GORT Detections
  44. GRB 081204: Swift XRT afterglow candidate
  45. Konus-Wind observation of GRB 081203A
  46. GRB081203A: Swift-XRT refined analysis
  47. GRB 081203B: SDSS upper limits at the position of the optical afterglow
  48. Swift/UVOT detection of GRB081203B
  49. GRB 081203B: Swift-XRT candidate afterglow.
  50. Swift UVOT observations of GRB 081203A
  51. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  52. GRB081203A: Swift/UVOT grism redshift
  53. GRB 081203A: Burst detection from Swift-BAT slew data
  54. GRB 081203A: Swift-BAT refined analysis
  55. GRB 081130B: MASTER prompt optical observations
  56. GRB 081203: Swift detection of a burst with a bright optical counterpart
  57. GRB 081130B: Fermi GBM detection
  58. GRB 081130: Fermi GBM detection
  59. Swift Trigger 335971: Swift/UVOT Observations
  60. GRB 081126: Fermi GBM detection
  61. Fermi Gamma-ray Burst Monitor trigger 249166723 reclassification
  62. GRB 081129: Fermi GBM detection
  63. Swift Trigger 335971 is probably not a real source
  64. Trigger 335971: Swift possible detection of a burst
  65. GRB081128: Swift/UVOT Upper Limits
  66. SGR 1806-20: Fermi GBM detection.
  67. GRB 081122B: Fermi GBM Detection
  68. GRB 081128: Swift-XRT refined analysis
  69. GRB 081128: Swift-BAT refined analysis
  70. GRB 081128: Swift detection of a burst
  71. GRB 081126: GRT Optical Observation
  72. GRB 081127: Swift/UVOT Upper Limits
  73. GRB 081127: Swift-BAT refined analysis
  74. GRB 081126: Swift-XRT refined analysis
  75. GRB 081127: Swift detection of a burst
  76. GRB 081126: Swift/UVOT Observations
  77. GRB 081126: optical observations
  78. GRB 081126: Swift-BAT refined analysis
  79. GRB 081126: TAROT Calern observatory optical observations
  80. GRB 081126: Swift detection of a burst
  81. GRB 081125: Fermi GBM detection
  82. GRB 081124: Fermi GBM detection
  83. GRB 081120: Fermi GBM detection
  84. GRB 081118: Fermi GBM detection.
  85. GRB 081122: Fermi GBM detection
  86. Konus-Wind observation of GRB 081121
  87. GRB081121: Fermi GBM detection
  88. Fermi GBM detection of a weak source
  89. GRB081121: Refined Swift/UVOT observations
  90. GRB 081121: Swift-XRT refined analysis
  91. GRB 081121: GROND observations
  92. GRB 081121: Swift-BAT refined analysis
  93. GRB081121: Swift/UVOT observations
  94. GRB 081121: Swift detection of a burst
  95. GRB 081121: ROTSE-III Detection of Optical Counterpart
  96. GRB081118 : optical upper limit
  97. GRB 081119: Fermi GBM detection
  98. GRB 081118: Swift-XRT refined analysis
  99. GRB 081118: GROND detection of afterglow
  100. GRB 081118: Swift UVOT Upper Limits

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