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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"

27480 results found.

  1. GRB090113: XRT position
  2. GRB 090112B: Fermi GBM Detection
  3. GRB 090113: Swift detection of a burst
  4. GRB 090112: Fermi GBM detection
  5. GRB 090109: Fermi GBM detection
  6. GRB 090108B: Fermi GBM detection
  7. GRB 090111, Swift-BAT refined analysis
  8. GRB 090111: Swift UVOT Upper Limits
  9. GRB 090108: Fermi GBM Detection
  10. GRB 090111: Swift-XRT refined analysis
  11. GRB 090111: Swift detection of a burst
  12. GRB090107B: Fermi GBM Detection
  13. GRB 090107B: Swift XRT afterglow confirmation
  14. GRB 090107B: Swift/UVOT Observations
  15. GRB 090107B: Swift-XRT detection of possible afterglow
  16. GRB 090107B: ROTSE-III Optical Limits
  17. Fermi/GBM detection of GRB 081226A
  18. Fermi/GBM detection of GRB 081225
  19. GRB 090107: Swift-BAT refined analysis
  20. GRB 090107: Swift detection of a burst
  21. GRB 081231: Fermi GBM Detection
  22. GRB 090102: GRT Optical Observation
  23. Swift triggered on the HMXB 1A 1118-61
  24. Konus-Wind observation of GRB 090102
  25. GRB 081229: Fermi GBM detection
  26. Swift UVOT observations of GRB 090102
  27. GRB 090102: Swift-BAT refined analysis
  28. GRB 090102: Swift XRT refined analysis
  29. GRB 090102: TAROT Calern observatory optical light curve
  30. GRB 090102: Swift detection of a burst with an optical counterpart
  31. GRB 090102: TAROT Calern observatory optical observations
  32. GRB 081230: GROND confirmation of the afterglow
  33. GRB 081230, Swift-BAT refined analysis
  34. GRB 081230 Swift/UVOT Observations
  35. GRB 081230: Swift/UVOT Detection of an Optical Afterglow
  36. GRB 081230: ROTSE-III Detection of Optical Counterpart
  37. GRB 081230: Swift detection of a burst
  38. GRB 081228: GROND confirmation of the optical/NIR afterglow
  39. GRB 081226B: Fermi GBM observation
  40. GRB 081226C: Fermi GBM detection
  41. GRB 081228, Swift-BAT refined analysis
  42. GRB 081228: Swift/UVOT Upper Limits
  43. GRB 081228: Swift-XRT Team refined analysis
  44. GRB 081228: detection by GROND
  45. GRB 081228: TAROT Calern observatory optical observations
  46. GRB 081228: Swift detection of a burst
  47. GRB 081226B: Swift XRT and UVOT upper limits
  48. GRB 081224: Suzaku WAM observation of the prompt emission
  49. GRB 081226: Swift-XRT refined analysis
  50. GRB 081226A: Swift UVOT Upper Limits
  51. GRB 081226A: Swift-BAT refined analysis
  52. GRB 081226: ROTSE-III Optical Limits
  53. GRB 081226: Swift detection of a possible short-hard burst
  54. GRB 081224: Swift-XRT observation
  55. GRB 081224: Fermi GBM Detection & LAT Localization
  56. Konus-Wind observation of GRB 081222
  57. GRB 081223: Fermi GBM detection
  58. GRB 081221: GROND observations
  59. GRB 081222: Fermi GBM observation
  60. Fermi Gamma-ray Burst Monitor trigger 251687595 reclassification
  61. GRB081222: Swift/UVOT further observations
  62. GRB 081204C: Fermi GBM detection
  63. GRB 081222, Swift-BAT refined analysis
  64. GRB 081221, Swift-BAT refined analysis
  65. GRB081222 optical limit by "Pi of the Sky"
  66. Konus-Wind observation of very bright GRB 081215A
  67. GRB 081222: Swift XRT refined analysis
  68. GRB081221: Fermi GBM observation
  69. Swift/UVOT observations of GRB 081221
  70. IPN triangulation of bright GRB 081215A
  71. GRB 081221: Swift-XRT Refined Analysis
  72. GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
  73. GRB081222, optical observation
  74. GRB081222: Swift/UVOT detection of an optical afterglow
  75. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  76. GRB 081222: Swift detection of a burst with a bright optical afterglow
  77. GRB 081221: Swift detection of a burst
  78. GRB 081217: Fermi GBM detection
  79. Modification of Swift/UVOT response to bright GRBs
  80. GRB 081211B: Further Swift-XRT analysis
  81. GRB 081215B: Fermi GBM detection
  82. GRB 081216: Suzaku WAM observation of the prompt emission
  83. GRB 081216 : Fermi GBM observation
  84. GRB 081215A: Fermi GBM detection
  85. IPN localization of short hard GRB 081216
  86. GRB 081211B - possibly a short burst with extended emission
  87. GRB 081118: Zadko observations
  88. Possible GRB 081211B: Swift/UVOT Upper Limits
  89. GRB 081213: Fermi GBM detection
  90. Possible GRB 081211B - Swift-XRT analysis
  91. GRB 081207: Fermi GBM detection
  92. GRB 081209: Fermi GBM detection
  93. Fermi Gamma-ray Burst Monitor trigger 250533995 is not a GRB
  94. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  95. GRB 081211: Swift-BAT refined analysis
  96. GRB 081211: Swift XRT refined analysis
  97. GRB 081211: Swift/UVOT detection of an optical afterglow
  98. GRB 081210: Swift/UVOT refined analysis
  99. GRB 081211: Swift detection of a burst
  100. GRB 081210: Swift-XRT refined analysis

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