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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"

21525 results found.

  1. GRB 081230: GROND confirmation of the afterglow
  2. GRB 081230, Swift-BAT refined analysis
  3. GRB081230: Swift-XRT refined analysis
  4. GRB 081230 Swift/UVOT Observations
  5. GRB 081230: Enhanced Swift-XRT position
  6. GRB 081230: Swift/UVOT Detection of an Optical Afterglow
  7. GRB 081230: ROTSE-III Detection of Optical Counterpart
  8. GRB 081230: Swift detection of a burst
  9. GRB 081228: GROND confirmation of the optical/NIR afterglow
  10. GRB 081228, Swift-BAT refined analysis
  11. GRB 081228: Swift/UVOT Upper Limits
  12. GRB 081228: Swift-XRT Team refined analysis
  13. GRB 081228: detection by GROND
  14. GRB 081228: Enhanced Swift-XRT position
  15. GRB 081228: TAROT Calern observatory optical observations
  16. GRB 081228: Swift detection of a burst
  17. GRB 081226B: Swift XRT and UVOT upper limits
  18. GRB 081226: Swift-XRT refined analysis
  19. GRB 081226A: Swift UVOT Upper Limits
  20. GRB 081226: Second epoch of Gemini-South imaging
  21. GRB 081226A: Swift-BAT refined analysis
  22. GRB 081226: Gemini-South imaging
  23. GRB 081226: GROND afterglow candidate
  24. GRB 081226: ROTSE-III Optical Limits
  25. GRB 081226: Swift detection of a possible short-hard burst
  26. GRB 081211B: optical observations
  27. GRB 081224: Swift-XRT observation
  28. Konus-Wind observation of GRB 081222
  29. GRB 081221: GROND observations
  30. GRB 081222:Optical afterglow observation
  31. GRB 081222: Fermi GBM observation
  32. GRB081222: Swift/UVOT further observations
  33. GRB 081221: Probable host galaxy in Keck imaging
  34. GRB 081222, Swift-BAT refined analysis
  35. GRB 081221, Swift-BAT refined analysis
  36. GRB081222 optical limit by "Pi of the Sky"
  37. GRB 081222: Swift XRT refined analysis
  38. GRB081221: Fermi GBM observation
  39. Swift/UVOT observations of GRB 081221
  40. IPN triangulation of bright GRB 081215A
  41. GRB 081221: Swift-XRT Refined Analysis
  42. GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
  43. GRB 081221: Gemini-N nIR imaging
  44. GRB081222, optical observation
  45. GRB081222: Swift/UVOT detection of an optical afterglow
  46. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  47. GRB081222: REM candidate afterglow
  48. GRB 081222: Swift detection of a burst with a bright optical afterglow
  49. GRB 081221: Enhanced Swift-XRT position
  50. GRB 081221: further NOT observations
  51. GRB 081221: NOT observations
  52. GRB 081221: Swift detection of a burst
  53. Modification of Swift/UVOT response to bright GRBs
  54. GRB 081211B: Further Swift-XRT analysis
  55. GRB 081211B - possibly a short burst with extended emission
  56. GRB 081118: Zadko observations
  57. Possible GRB 081211B: Swift/UVOT Upper Limits
  58. GRB 081210: optical observations
  59. Possible GRB 081211B - Swift-XRT analysis
  60. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  61. GRB 081211: Swift-BAT refined analysis
  62. GRB 081211: Swift XRT refined analysis
  63. GRB 081211: Swift/UVOT detection of an optical afterglow
  64. GRB 081211: Enhanced Swift-XRT position
  65. GRB 081210: Swift/UVOT refined analysis
  66. GRB 081211: Swift detection of a burst
  67. GRB 081210: Swift-XRT refined analysis
  68. GRB 081210: Enhanced Swift-XRT position
  69. GRB 081210: Swift-BAT refined analysis
  70. GRB 081210: Swift detection of a burst with optical afterglow
  71. IPN triangulation of short hard GRB 081209
  72. Radio observation of GRB 081121 with ATCA
  73. GRB 081128: afterglow observations
  74. GRB 081203B: Suzaku WAM observation of the prompt emission
  75. Radio observation of GRB 081029 with ATCA
  76. Radio observation of GRB 081008 with ATCA
  77. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  78. GRB 081128: optical observation in CrAO
  79. GRB 081128: Optical afterglow observations
  80. GRB 081204: GROND Observations
  81. GRB 081204: Magellan observations
  82. GRB 081204: Swift/UVOT Upper Limits
  83. GRB 081204: Swift XRT afterglow confirmation
  84. GRB 081204: Swift XRT afterglow candidate
  85. Swift-XRT observations of GRB 081203B
  86. Konus-Wind observation of GRB 081203A
  87. Konus-Wind observation of GRB 081203B
  88. GRB081203A: Swift-XRT refined analysis
  89. GRB 081203B: optical observations
  90. Swift/UVOT detection of GRB081203B
  91. GRB 081203B: Swift-XRT candidate afterglow.
  92. GRB 081203A: optical observations
  93. Swift UVOT observations of GRB 081203A
  94. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  95. GRB081203A: Swift/UVOT grism redshift
  96. GRB 081203A: Burst detection from Swift-BAT slew data
  97. GRB 081203A: Swift-BAT refined analysis
  98. GRB 081203: Enhanced Swift-XRT position
  99. GRB081203: optical observation
  100. GRB 081203: Swift detection of a burst with a bright optical counterpart

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