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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"

28061 results found.

  1. GRB 090102: Swift detection of a burst with an optical counterpart
  2. GRB 090102: TAROT Calern observatory optical observations
  3. GRB 081230: GROND confirmation of the afterglow
  4. GRB 081230, Swift-BAT refined analysis
  5. GRB081230: Swift-XRT refined analysis
  6. GRB 081230 Swift/UVOT Observations
  7. GRB 081230: Enhanced Swift-XRT position
  8. GRB 081230: ROTSE-III Detection of Optical Counterpart
  9. GRB 081230: Swift detection of a burst
  10. GRB 081226C: Fermi GBM detection
  11. GRB 081228, Swift-BAT refined analysis
  12. VLA radio detection of GRB 081221
  13. GRB 081228: Swift/UVOT Upper Limits
  14. GRB 081228: Swift-XRT Team refined analysis
  15. GRB 081228: detection by GROND
  16. GRB 081228: Enhanced Swift-XRT position
  17. GRB 081228: TAROT Calern observatory optical observations
  18. GRB 081228: Swift detection of a burst
  19. VLA radio observation of GRB 081221
  20. GRB 081226B: Swift XRT and UVOT upper limits
  21. GRB 081224: Suzaku WAM observation of the prompt emission
  22. GRB 081226: Swift-XRT refined analysis
  23. GRB 081226A: Swift UVOT Upper Limits
  24. GRB 081226A: Swift-BAT refined analysis
  25. GRB 081226: GROND afterglow candidate
  26. GRB 081226: ROTSE-III Optical Limits
  27. GRB 081226: Swift detection of a possible short-hard burst
  28. GRB 080810: optical observations
  29. GRB 081211B: optical observations
  30. GRB 081224: Swift-XRT observation
  31. GRB 081222: MITSuME optical observation
  32. GRB 081224: Fermi GBM Detection & LAT Localization
  33. GRB 080810: optical observations
  34. Konus-Wind observation of GRB 081222
  35. GRB 081223: Fermi GBM detection
  36. GRB 081221: GROND observations
  37. VLA radio upper limit on GRB 081222
  38. GRB 081222: Fermi GBM observation
  39. GRB 081221: Probable host galaxy in Keck imaging
  40. GRB 081204C: Fermi GBM detection
  41. GRB 081222, Swift-BAT refined analysis
  42. GRB 081221, Swift-BAT refined analysis
  43. GRB081222 optical limit by "Pi of the Sky"
  44. GRB 081222: Swift XRT refined analysis
  45. GRB081221: Fermi GBM observation
  46. IPN triangulation of bright GRB 081215A
  47. GRB 081222: Faulkes Telescope South observations
  48. GRB 081221: Gemini-N nIR imaging
  49. GRB081222, optical observation
  50. GRB081203A: BTA observation
  51. Konus-Wind observation of GRB 081221
  52. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  53. GRB081222: REM candidate afterglow
  54. GRB 081222: Swift detection of a burst with a bright optical afterglow
  55. GRB 081221: Enhanced Swift-XRT position
  56. GRB 081221: further NOT observations
  57. GRB 081221: NOT observations
  58. GRB 081221: Swift detection of a burst
  59. GRB 081217: Fermi GBM detection
  60. GRB 081211B: Further Swift-XRT analysis
  61. GRB 081215B: Fermi GBM detection
  62. GRB 081216: Suzaku WAM observation of the prompt emission
  63. GRB 081216 : Fermi GBM observation
  64. GRB 081215A: Fermi GBM detection
  65. GRB 081118: Zadko observations
  66. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  67. GRB 0811215A: MASTER prompt optical observations
  68. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  69. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  70. Possible GRB 081211B: Swift/UVOT Upper Limits
  71. GRB 081213: Fermi GBM detection
  72. Possible GRB 081211B - Swift-XRT analysis
  73. GRB 081207: Fermi GBM detection
  74. GRB 081209: Fermi GBM detection
  75. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  76. GRB 081210, SMARTS optical/IR observations
  77. GRB 081211: Swift-BAT refined analysis
  78. GRB 081211: Swift XRT refined analysis
  79. GRB 081211: Enhanced Swift-XRT position
  80. GRB 081211: Swift detection of a burst
  81. GRB 081210: Swift-XRT refined analysis
  82. GRB081203B: optical observations
  83. GRB 081210: Enhanced Swift-XRT position
  84. GRB 081210: Swift-BAT refined analysis
  85. GRB 081210: Swift detection of a burst with optical afterglow
  86. IPN triangulation of short hard GRB 081209
  87. GRB 081203A: optical observations
  88. GRB 081206C: Fermi GBM detection
  89. Radio observation of GRB 081121 with ATCA
  90. Radio observation of GRB 081118 with ATCA
  91. GRB 081206B: Fermi GBM detection
  92. GRB 081206: Fermi GBM detection
  93. GRB 081128: afterglow observations
  94. GRB 081203B: Suzaku WAM observation of the prompt emission
  95. Radio observation of GRB 081109 with ATCA
  96. Radio observation of GRB 081104 with ATCA
  97. Radio observation of GRB 081029 with ATCA
  98. Radio observation of GRB 081008 with ATCA
  99. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  100. GRB081203A: Optical observations at Ishigaki

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