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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"

28058 results found.

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

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