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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"

14326 results found.

  1. GRB 081230: Swift detection of a burst
  2. GRB 081226C: Fermi GBM detection
  3. VLA radio detection of GRB 081221
  4. GRB 081228: detection by GROND
  5. GRB 081228: Swift detection of a burst
  6. GRB 081226: Swift detection of a possible short-hard burst
  7. GRB081224: LAT retraction
  8. GRB 081224: Fermi GBM Detection & LAT Localization
  9. GRB 081223: Fermi GBM detection
  10. GRB 081222: Gemini-South absorption redshift
  11. GRB081222: Swift/UVOT further observations
  12. GRB 081221: Probable host galaxy in Keck imaging
  13. GRB 081204C: Fermi GBM detection
  14. GRB 081221: Gemini-N nIR imaging
  15. GRB081222: Swift/UVOT detection of an optical afterglow
  16. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  17. GRB 081222: Swift detection of a burst with a bright optical afterglow
  18. GRB 081221: Swift detection of a burst
  19. GRB 081217: Fermi GBM detection
  20. GRB081215A: Fermi-LAT observations
  21. GRB 081211B: Further Swift-XRT analysis
  22. GRB 081215B: Fermi GBM detection
  23. GRB 081215A: Fermi GBM detection (correction to event fluence)
  24. GRB 081215A: Fermi GBM detection
  25. GRB 081118: Zadko observations
  26. GRB 081213: Fermi GBM detection
  27. GRB 081207: Fermi GBM detection
  28. GRB 081209: Fermi GBM detection
  29. GRB 081007: Detection of a Supernova
  30. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  31. GRB 081211: Swift/UVOT detection of an optical afterglow
  32. GRB 081210: Swift/UVOT refined analysis
  33. GRB 081211: Swift detection of a burst
  34. GRB 081210: Swift detection of a burst with optical afterglow
  35. GRB 081206C: Fermi GBM detection
  36. GRB 081206B: Fermi GBM detection
  37. GRB 081206: Fermi GBM detection
  38. GRB 081128: afterglow observations
  39. Radio detection of GRB 081203B with the VLA
  40. GRB081203A: Radio upper limit at 15 GHz
  41. GRB 081204B: Fermi GBM detection
  42. GRB 081204: Swift XRT afterglow confirmation
  43. Swift/UVOT detection of GRB081203B
  44. Swift UVOT observations of GRB 081203A
  45. GRB 081203A: Burst detection from Swift-BAT slew data
  46. GRB 081203: Swift detection of a burst with a bright optical counterpart
  47. GRB 081130B: Fermi GBM detection
  48. GRB 081130: Fermi GBM detection
  49. GRB 081126: Fermi GBM detection
  50. GRB 081129: Fermi GBM detection
  51. Trigger 335971: Swift possible detection of a burst
  52. SGR 1806-20: Fermi GBM detection.
  53. GRB 081122B: Fermi GBM Detection
  54. GRB 081128: Swift detection of a burst
  55. GRB081126: Afterglow photometry from Crni Vrh
  56. GRB 081126: Confirmation of the Optical Afterglow
  57. GRB 081127: Swift detection of a burst
  58. GRB 081126: Swift/UVOT Observations
  59. GRB 081126: Swift detection of a burst
  60. GRB 081125: Fermi GBM detection
  61. GRB 081124: Fermi GBM detection
  62. GRB 081120: Fermi GBM detection
  63. GRB 081118: Fermi GBM detection.
  64. GRB 081122: Fermi GBM detection
  65. GRB081121: Fermi GBM detection
  66. Fermi GBM detection of a weak source
  67. GRB081121: Refined Swift/UVOT observations
  68. GRB 081121: Swift detection of a burst
  69. GRB 081121: ROTSE-III Detection of Optical Counterpart
  70. GRB 081119: Fermi GBM detection
  71. GRB 081118: GROND detection of afterglow
  72. GRB 081118: Swift detection of a burst
  73. GRB 081109A: confirmation of possible detection host galaxy
  74. GRB 081113: Fermi GBM detection
  75. GRB 081110: Fermi GBM detection
  76. GRB 081109: GROND redshift limit and host extinction
  77. Swift-BAT refined analysis of trigger 334129
  78. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  79. GRB 081109A: Possible Swift-UVOT detection
  80. GRB 081109: Fermi GBM detection
  81. Swift-BAT Trigger 334129: possible burst
  82. GRB 081109: REM NIR afterglow detection
  83. GRB 081109: Swift detection of a burst
  84. GRB 081028 - PAIRITEL NIR detection
  85. GRB 081024C: Fermi Gamma-ray Burst Monitor detection
  86. SGR 1806-20: Fermi GBM detection
  87. GRB 081102B: Fermi GBM detection
  88. GRB 081105B: Fermi GBM detection
  89. GRB 081107: Fermi GBM detection
  90. GRB 081101B: Fermi GBM detection
  91. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  92. Fermi-GBM detection of a Solar Flare
  93. Fermi Detection of GRB 081102
  94. GRB 081104: Swift detection of a burst
  95. GRB 081102: Swift detection of a burst
  96. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  97. GRB 081029: UVOT Detection of the Optical Afterglow
  98. GRB 081029: Redshift Confirmation from Gemini-South
  99. GRB 081029: UVES/VLT Absorption Redshift
  100. GRB 081029: GROND Detection of the Optical/NIR Afterglow

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