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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"

28232 results found.

  1. GRB 081224: Swift-XRT observation
  2. GRB 081222: MITSuME optical observation
  3. GRB 081224: Fermi GBM Detection & LAT Localization
  4. GRB 080810: optical observations
  5. Konus-Wind observation of GRB 081222
  6. GRB 081223: Fermi GBM detection
  7. GRB 081221: GROND observations
  8. VLA radio upper limit on GRB 081222
  9. GRB 081222: Fermi GBM observation
  10. GRB 081221: Probable host galaxy in Keck imaging
  11. GRB 081204C: Fermi GBM detection
  12. GRB 081222, Swift-BAT refined analysis
  13. GRB 081221, Swift-BAT refined analysis
  14. GRB081222 optical limit by "Pi of the Sky"
  15. GRB 081222: Swift XRT refined analysis
  16. GRB081221: Fermi GBM observation
  17. IPN triangulation of bright GRB 081215A
  18. GRB 081222: Faulkes Telescope South observations
  19. GRB 081221: Gemini-N nIR imaging
  20. GRB081222, optical observation
  21. GRB081203A: BTA observation
  22. Konus-Wind observation of GRB 081221
  23. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  24. GRB081222: REM candidate afterglow
  25. GRB 081222: Swift detection of a burst with a bright optical afterglow
  26. GRB 081221: Enhanced Swift-XRT position
  27. GRB 081221: further NOT observations
  28. GRB 081221: NOT observations
  29. GRB 081221: Swift detection of a burst
  30. GRB 081217: Fermi GBM detection
  31. GRB 081211B: Further Swift-XRT analysis
  32. GRB 081215B: Fermi GBM detection
  33. GRB 081216: Suzaku WAM observation of the prompt emission
  34. GRB 081216 : Fermi GBM observation
  35. GRB 081215A: Fermi GBM detection
  36. GRB 081118: Zadko observations
  37. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  38. GRB 0811215A: MASTER prompt optical observations
  39. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  40. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  41. Possible GRB 081211B: Swift/UVOT Upper Limits
  42. GRB 081213: Fermi GBM detection
  43. Possible GRB 081211B - Swift-XRT analysis
  44. GRB 081207: Fermi GBM detection
  45. GRB 081209: Fermi GBM detection
  46. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  47. GRB 081210, SMARTS optical/IR observations
  48. GRB 081211: Swift-BAT refined analysis
  49. GRB 081211: Swift XRT refined analysis
  50. GRB 081211: Enhanced Swift-XRT position
  51. GRB 081211: Swift detection of a burst
  52. GRB 081210: Swift-XRT refined analysis
  53. GRB081203B: optical observations
  54. GRB 081210: Enhanced Swift-XRT position
  55. GRB 081210: Swift-BAT refined analysis
  56. GRB 081210: Swift detection of a burst with optical afterglow
  57. IPN triangulation of short hard GRB 081209
  58. GRB 081203A: optical observations
  59. GRB 081206C: Fermi GBM detection
  60. Radio observation of GRB 081121 with ATCA
  61. Radio observation of GRB 081118 with ATCA
  62. GRB 081206B: Fermi GBM detection
  63. GRB 081206: Fermi GBM detection
  64. GRB 081128: afterglow observations
  65. GRB 081203B: Suzaku WAM observation of the prompt emission
  66. Radio observation of GRB 081109 with ATCA
  67. Radio observation of GRB 081104 with ATCA
  68. Radio observation of GRB 081029 with ATCA
  69. Radio observation of GRB 081008 with ATCA
  70. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  71. GRB081203A: Optical observations at Ishigaki
  72. GRB 081204: GROND Observations
  73. Radio detection of GRB 081203B with the VLA
  74. GRB081203A: Radio upper limit at 15 GHz
  75. GRB 081204B: Fermi GBM detection
  76. GRB 081204: Swift/UVOT Upper Limits
  77. GRB 081204: Swift XRT afterglow confirmation
  78. GRB081203A: MITSuME optical observation
  79. GRB081203A: optical observation
  80. GRB 081204 : a long GRB localized by INTEGRAL
  81. VLA Radio upper limit on GRB 081203A
  82. Swift-XRT observations of GRB 081203B
  83. GRB081203A: Swift-XRT refined analysis
  84. GRB 081203B: optical observations
  85. Swift/UVOT detection of GRB081203B
  86. GRB 081203B: Swift-XRT candidate afterglow.
  87. GRB 081203A: optical observations
  88. GRB081203A: Swift/UVOT grism redshift
  89. GRB 081203A: Burst detection from Swift-BAT slew data
  90. GRB 081203A: Swift-BAT refined analysis
  91. GRB 081203: Enhanced Swift-XRT position
  92. GRB 081130B: MASTER prompt optical observations
  93. GRB081203: optical observation
  94. GRB 081203: Swift detection of a burst with a bright optical counterpart
  95. GRB 081130B: Fermi GBM detection
  96. GRB 081130: Fermi GBM detection
  97. Swift Trigger 335971: Swift/UVOT Observations
  98. GRB 081126: afterglow photometry
  99. GRB 081126: Fermi GBM detection
  100. VLA Radio upper limit on GRB 081126

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