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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"

19538 results found.

  1. GRB 081230: ROTSE-III Detection of Optical Counterpart
  2. GRB 081230: Swift detection of a burst
  3. GRB 081228: GROND confirmation of the optical/NIR afterglow
  4. GRB 081228, Swift-BAT refined analysis
  5. GRB 081228: Swift/UVOT Upper Limits
  6. GRB 081228: Swift-XRT Team refined analysis
  7. GRB 081228: detection by GROND
  8. GRB 081228: Enhanced Swift-XRT position
  9. GRB 081228: TAROT Calern observatory optical observations
  10. GRB 081228: Swift detection of a burst
  11. GRB 081226B: Swift XRT and UVOT upper limits
  12. GRB 081226: Swift-XRT refined analysis
  13. GRB 081226A: Swift UVOT Upper Limits
  14. GRB 081226A: Swift-BAT refined analysis
  15. GRB 081226: ROTSE-III Optical Limits
  16. GRB 081226: Swift detection of a possible short-hard burst
  17. GRB 081224: Swift-XRT observation
  18. Konus-Wind observation of GRB 081222
  19. GRB 081221: GROND observations
  20. GRB 081222:Optical afterglow observation
  21. GRB 081222: Fermi GBM observation
  22. GRB081222: Swift/UVOT further observations
  23. GRB 081221: Probable host galaxy in Keck imaging
  24. GRB 081222, Swift-BAT refined analysis
  25. GRB 081221, Swift-BAT refined analysis
  26. GRB081222 optical limit by "Pi of the Sky"
  27. GRB 081222: Swift XRT refined analysis
  28. GRB081221: Fermi GBM observation
  29. Swift/UVOT observations of GRB 081221
  30. IPN triangulation of bright GRB 081215A
  31. GRB 081221: Swift-XRT Refined Analysis
  32. GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
  33. GRB081222, optical observation
  34. GRB081222: Swift/UVOT detection of an optical afterglow
  35. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  36. GRB 081222: Swift detection of a burst with a bright optical afterglow
  37. GRB 081221: Enhanced Swift-XRT position
  38. GRB 081221: Swift detection of a burst
  39. Modification of Swift/UVOT response to bright GRBs
  40. GRB 081211B: Further Swift-XRT analysis
  41. GRB 081211B - possibly a short burst with extended emission
  42. Possible GRB 081211B: Swift/UVOT Upper Limits
  43. GRB 081210: optical observations
  44. Possible GRB 081211B - Swift-XRT analysis
  45. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  46. GRB 081211: Swift-BAT refined analysis
  47. GRB 081211: Swift XRT refined analysis
  48. GRB 081211: Swift/UVOT detection of an optical afterglow
  49. GRB 081211: Enhanced Swift-XRT position
  50. GRB 081210: Swift/UVOT refined analysis
  51. GRB 081211: Swift detection of a burst
  52. GRB 081210: Swift-XRT refined analysis
  53. GRB 081210: Enhanced Swift-XRT position
  54. GRB 081210: Swift-BAT refined analysis
  55. GRB 081210: Swift detection of a burst with optical afterglow
  56. IPN triangulation of short hard GRB 081209
  57. Radio observation of GRB 081121 with ATCA
  58. GRB 081203B: Suzaku WAM observation of the prompt emission
  59. Radio observation of GRB 081029 with ATCA
  60. Radio observation of GRB 081008 with ATCA
  61. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  62. GRB 081128: optical observation in CrAO
  63. GRB 081128: Optical afterglow observations
  64. GRB 081204: GROND Observations
  65. GRB 081204: Swift/UVOT Upper Limits
  66. GRB 081204: Swift XRT afterglow confirmation
  67. GRB 081204: Swift XRT afterglow candidate
  68. Swift-XRT observations of GRB 081203B
  69. Konus-Wind observation of GRB 081203A
  70. Konus-Wind observation of GRB 081203B
  71. GRB081203A: Swift-XRT refined analysis
  72. GRB 081203B: optical observations
  73. Swift/UVOT detection of GRB081203B
  74. GRB 081203B: Swift-XRT candidate afterglow.
  75. GRB 081203A: optical observations
  76. Swift UVOT observations of GRB 081203A
  77. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  78. GRB081203A: Swift/UVOT grism redshift
  79. GRB 081203A: Burst detection from Swift-BAT slew data
  80. GRB 081203A: Swift-BAT refined analysis
  81. GRB 081203: Enhanced Swift-XRT position
  82. GRB081203: optical observation
  83. GRB 081203: Swift detection of a burst with a bright optical counterpart
  84. GRB 081128: optical observation
  85. Swift Trigger 335971: Swift/UVOT Observations
  86. GRB 081126: Fermi GBM detection
  87. Swift Trigger 335971 is probably not a real source
  88. Trigger 335971: Swift possible detection of a burst
  89. GRB081128: Swift/UVOT Upper Limits
  90. GRB 081128: Swift-XRT refined analysis
  91. GRB081128: optical observations
  92. GRB 081128: Swift-BAT refined analysis
  93. GRB 081128: Enhanced Swift-XRT position
  94. GRB 081128: Swift detection of a burst
  95. GRB 081126: Swift observations continuing
  96. GRB081126: Afterglow photometry from Crni Vrh
  97. GRB 081126: GRT Optical Observation
  98. GRB 081127: Swift/UVOT Upper Limits
  99. GRB 081127: Swift-XRT refined analysis
  100. GRB 081127: Enhanced Swift-XRT position

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