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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"

28270 results found.

  1. GRB 081229: Fermi GBM detection
  2. GRB 090102: P60 Imaging and P200 Spectroscopy
  3. GRB 090102 Observations from IAC80
  4. GRB 090102: GROND observations of the optical afterglow
  5. GRB 090102: Swift-BAT refined analysis
  6. GRB 090102: Swift XRT refined analysis
  7. GRB 090102: NOT redshift
  8. GRB 090102: Enhanced Swift-XRT position
  9. GRB 090102: REM observations of a bright afterglow
  10. GRB 090102: Swift detection of a burst with an optical counterpart
  11. GRB 090102: TAROT Calern observatory optical observations
  12. GRB 081230: GROND confirmation of the afterglow
  13. GRB 081230, Swift-BAT refined analysis
  14. GRB081230: Swift-XRT refined analysis
  15. GRB 081230 Swift/UVOT Observations
  16. GRB 081230: Enhanced Swift-XRT position
  17. GRB 081230: ROTSE-III Detection of Optical Counterpart
  18. GRB 081230: Swift detection of a burst
  19. GRB 081226C: Fermi GBM detection
  20. GRB 081228, Swift-BAT refined analysis
  21. VLA radio detection of GRB 081221
  22. GRB 081228: Swift/UVOT Upper Limits
  23. GRB 081228: Swift-XRT Team refined analysis
  24. GRB 081228: detection by GROND
  25. GRB 081228: Enhanced Swift-XRT position
  26. GRB 081228: TAROT Calern observatory optical observations
  27. GRB 081228: Swift detection of a burst
  28. VLA radio observation of GRB 081221
  29. GRB 081226B: Swift XRT and UVOT upper limits
  30. GRB 081224: Suzaku WAM observation of the prompt emission
  31. GRB 081226: Swift-XRT refined analysis
  32. GRB 081226A: Swift UVOT Upper Limits
  33. GRB 081226A: Swift-BAT refined analysis
  34. GRB 081226: GROND afterglow candidate
  35. GRB 081226: ROTSE-III Optical Limits
  36. GRB 081226: Swift detection of a possible short-hard burst
  37. GRB 080810: optical observations
  38. GRB 081211B: optical observations
  39. GRB 081224: Swift-XRT observation
  40. GRB 081222: MITSuME optical observation
  41. GRB 081224: Fermi GBM Detection & LAT Localization
  42. GRB 080810: optical observations
  43. Konus-Wind observation of GRB 081222
  44. GRB 081223: Fermi GBM detection
  45. GRB 081221: GROND observations
  46. VLA radio upper limit on GRB 081222
  47. GRB 081222: Fermi GBM observation
  48. GRB 081221: Probable host galaxy in Keck imaging
  49. GRB 081204C: Fermi GBM detection
  50. GRB 081222, Swift-BAT refined analysis
  51. GRB 081221, Swift-BAT refined analysis
  52. GRB081222 optical limit by "Pi of the Sky"
  53. GRB 081222: Swift XRT refined analysis
  54. GRB081221: Fermi GBM observation
  55. IPN triangulation of bright GRB 081215A
  56. GRB 081222: Faulkes Telescope South observations
  57. GRB 081221: Gemini-N nIR imaging
  58. GRB081222, optical observation
  59. GRB081203A: BTA observation
  60. Konus-Wind observation of GRB 081221
  61. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  62. GRB081222: REM candidate afterglow
  63. GRB 081222: Swift detection of a burst with a bright optical afterglow
  64. GRB 081221: Enhanced Swift-XRT position
  65. GRB 081221: further NOT observations
  66. GRB 081221: NOT observations
  67. GRB 081221: Swift detection of a burst
  68. GRB 081217: Fermi GBM detection
  69. GRB 081211B: Further Swift-XRT analysis
  70. GRB 081215B: Fermi GBM detection
  71. GRB 081216: Suzaku WAM observation of the prompt emission
  72. GRB 081216 : Fermi GBM observation
  73. GRB 081215A: Fermi GBM detection
  74. GRB 081118: Zadko observations
  75. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  76. GRB 0811215A: MASTER prompt optical observations
  77. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  78. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  79. Possible GRB 081211B: Swift/UVOT Upper Limits
  80. GRB 081213: Fermi GBM detection
  81. Possible GRB 081211B - Swift-XRT analysis
  82. GRB 081207: Fermi GBM detection
  83. GRB 081209: Fermi GBM detection
  84. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  85. GRB 081210, SMARTS optical/IR observations
  86. GRB 081211: Swift-BAT refined analysis
  87. GRB 081211: Swift XRT refined analysis
  88. GRB 081211: Enhanced Swift-XRT position
  89. GRB 081211: Swift detection of a burst
  90. GRB 081210: Swift-XRT refined analysis
  91. GRB081203B: optical observations
  92. GRB 081210: Enhanced Swift-XRT position
  93. GRB 081210: Swift-BAT refined analysis
  94. GRB 081210: Swift detection of a burst with optical afterglow
  95. IPN triangulation of short hard GRB 081209
  96. GRB 081203A: optical observations
  97. GRB 081206C: Fermi GBM detection
  98. Radio observation of GRB 081121 with ATCA
  99. Radio observation of GRB 081118 with ATCA
  100. GRB 081206B: Fermi GBM detection

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