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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"

36196 results found.

  1. GRB 081221: NOT observations
  2. GRB 081221: Swift detection of a burst
  3. GRB 081217: Fermi GBM detection
  4. GRB 081211B: Further Swift-XRT analysis
  5. GRB 081215B: Fermi GBM detection
  6. GRB 081216: Suzaku WAM observation of the prompt emission
  7. GRB 081216 : Fermi GBM observation
  8. GRB 081215A: Fermi GBM detection (correction to event fluence)
  9. GRB 081215A: Fermi GBM detection
  10. IPN localization of short hard GRB 081216
  11. GRB 081211B - possibly a short burst with extended emission
  12. GRB 081118: Zadko observations
  13. GRB 081215A: Gamma Repeater?
  14. GRB 0811215A: MASTER prompt optical observations
  15. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  16. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  17. Possible GRB 081211B: Swift/UVOT Upper Limits
  18. GRB 081213: Fermi GBM detection
  19. GRB 081210: optical observations
  20. Possible GRB 081211B - Swift-XRT analysis
  21. GRB 081207: Fermi GBM detection
  22. GRB 081209: Fermi GBM detection
  23. Fermi Gamma-ray Burst Monitor trigger 250533995 is not a GRB
  24. GRB 081007: Detection of a Supernova
  25. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  26. GRB 081210: Xinglong TNT R band Upper Limits
  27. GRB 081210, SMARTS optical/IR observations
  28. GRB 081211: Swift-BAT refined analysis
  29. GRB 081211: Swift XRT refined analysis
  30. GRB 081211: Swift/UVOT detection of an optical afterglow
  31. GRB 081211: Enhanced Swift-XRT position
  32. GRB 081210: Swift/UVOT refined analysis
  33. GRB 081211: Swift detection of a burst
  34. GRB 081210: Swift-XRT refined analysis
  35. GRB081203B: optical observations
  36. GRB 081210: Enhanced Swift-XRT position
  37. GRB 081210: Swift-BAT refined analysis
  38. GRB 081210: Swift detection of a burst with optical afterglow
  39. Konus-Wind observation of GRB 081209
  40. IPN triangulation of short hard GRB 081209
  41. GRB 081203A: optical observations
  42. GRB 081206C: Fermi GBM detection
  43. Radio observation of GRB 081121 with ATCA
  44. Radio observation of GRB 081118 with ATCA
  45. GRB 081206B: Fermi GBM detection
  46. GRB 081206: Fermi GBM detection
  47. GRB 081128: afterglow observations
  48. GRB 081203B: Suzaku WAM observation of the prompt emission
  49. GRB 081203B: Additional Gemini imaging
  50. Radio observation of GRB 081109 with ATCA
  51. Radio observation of GRB 081104 with ATCA
  52. Radio observation of GRB 081029 with ATCA
  53. Radio observation of GRB 081008 with ATCA
  54. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  55. GRB 081203B: Gemini observations
  56. GRB 081128: optical observation in CrAO
  57. GRB081203A: Optical observations at Ishigaki
  58. GRB 081128: Optical afterglow observations
  59. GRB 081204: GROND Observations
  60. GRB081203B: optical observations
  61. Radio detection of GRB 081203B with the VLA
  62. GRB 081204: Magellan observations
  63. GRB081203A: Radio upper limit at 15 GHz
  64. GRB 081204B: Fermi GBM detection
  65. GRB 081204: Swift/UVOT Upper Limits
  66. GRB 081204: Swift XRT afterglow confirmation
  67. GRB081203A: MITSuME optical observation
  68. GRB 081203A: Optical observations of Xinglong TNT telescope
  69. GRB 081203A: Skynet/GORT Detections
  70. GRB 081204: Swift XRT afterglow candidate
  71. GRB081203A: optical observation
  72. GRB 081204 : a long GRB localized by INTEGRAL
  73. VLA Radio upper limit on GRB 081203A
  74. Swift-XRT observations of GRB 081203B
  75. Konus-Wind observation of GRB 081203A
  76. Konus-Wind observation of GRB 081203B
  77. GRB081203A: Swift-XRT refined analysis
  78. GRB 081203B: optical observations
  79. GRB 081203B: SDSS upper limits at the position of the optical afterglow
  80. Swift/UVOT detection of GRB081203B
  81. GRB 081203B: Swift-XRT candidate afterglow.
  82. GRB 081203A: optical observations
  83. Swift UVOT observations of GRB 081203A
  84. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  85. GRB081203A: Swift/UVOT grism redshift
  86. GRB 081203A: Burst detection from Swift-BAT slew data
  87. GRB 081203A: Swift-BAT refined analysis
  88. GRB 081203: Enhanced Swift-XRT position
  89. GRB 081130B: MASTER prompt optical observations
  90. GRB081203: optical observation
  91. GRB 081203: Swift detection of a burst with a bright optical counterpart
  92. GRB 081128: optical observation
  93. GRB 081130B: Fermi GBM detection
  94. GRB 081130: Fermi GBM detection
  95. GRB 081126: afterglow photometry
  96. GRB 081126: Fermi GBM detection
  97. Fermi Gamma-ray Burst Monitor trigger 249166723 reclassification
  98. VLA Radio upper limit on GRB 081126
  99. GRB 081129: Fermi GBM detection
  100. GRB 081130: MASTER VWF prompt optical observations Fermi GRB

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