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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"

38580 results found.

  1. GRB081224: LAT retraction
  2. GRB 081224: Swift-XRT observation
  3. GRB 081222: MITSuME optical observation
  4. GRB 081224: Fermi GBM Detection & LAT Localization
  5. GRB 080810: optical observations
  6. Konus-Wind observation of GRB 081222
  7. GRB 081223: Fermi GBM detection
  8. GRB 081221: GROND observations
  9. GRB 081222: Gemini-N confirmation of redshift z=2.77
  10. GRB 081222:Optical afterglow observation
  11. VLA radio upper limit on GRB 081222
  12. GRB 081222: Fermi GBM observation
  13. Fermi Gamma-ray Burst Monitor trigger 251687595 reclassification
  14. GRB 081222: Gemini-South absorption redshift
  15. GRB081222: Swift/UVOT further observations
  16. GRB 081221: Probable host galaxy in Keck imaging
  17. GRB 081204C: Fermi GBM detection
  18. GRB081222 optical limit by "Pi of the Sky"
  19. Konus-Wind observation of very bright GRB 081215A
  20. GRB 081222: Swift XRT refined analysis
  21. GRB081221: Fermi GBM observation
  22. Swift/UVOT observations of GRB 081221
  23. IPN triangulation of bright GRB 081215A
  24. GRB 081221: Swift-XRT Refined Analysis
  25. GRB 081222: Faulkes Telescope South observations
  26. GRB081222, optical observation
  27. GRB081222: Swift/UVOT detection of an optical afterglow
  28. GRB081203A: BTA observation
  29. Konus-Wind observation of GRB 081221
  30. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  31. GRB081222: REM candidate afterglow
  32. GRB 081222: Swift detection of a burst with a bright optical afterglow
  33. GRB 081221: Enhanced Swift-XRT position
  34. GRB 081221: further NOT observations
  35. GRB 081221: NOT observations
  36. GRB 081221: Swift detection of a burst
  37. GRB 081217: Fermi GBM detection
  38. Modification of Swift/UVOT response to bright GRBs
  39. GRB081215A: Fermi-LAT observations
  40. GRB 081211B: Further Swift-XRT analysis
  41. GRB 081215B: Fermi GBM detection
  42. GRB 081216: Suzaku WAM observation of the prompt emission
  43. GRB 081216 : Fermi GBM observation
  44. GRB 081215A: Fermi GBM detection (correction to event fluence)
  45. GRB 081215A: Fermi GBM detection
  46. IPN localization of short hard GRB 081216
  47. GRB 081211B - possibly a short burst with extended emission
  48. GRB 081118: Zadko observations
  49. GRB 0811215A: MASTER prompt optical observations
  50. Possible GRB 081211B: Swift/UVOT Upper Limits
  51. GRB 081213: Fermi GBM detection
  52. GRB 081210: optical observations
  53. Possible GRB 081211B - Swift-XRT analysis
  54. GRB 081207: Fermi GBM detection
  55. GRB 081209: Fermi GBM detection
  56. Fermi Gamma-ray Burst Monitor trigger 250533995 is not a GRB
  57. GRB 081007: Detection of a Supernova
  58. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  59. GRB 081210: Xinglong TNT R band Upper Limits
  60. GRB 081210, SMARTS optical/IR observations
  61. GRB 081211: Swift XRT refined analysis
  62. GRB 081211: Swift/UVOT detection of an optical afterglow
  63. GRB 081211: Enhanced Swift-XRT position
  64. GRB 081210: Swift/UVOT refined analysis
  65. GRB 081211: Swift detection of a burst
  66. GRB 081210: Swift-XRT refined analysis
  67. GRB081203B: optical observations
  68. GRB 081210: Enhanced Swift-XRT position
  69. GRB 081210: Swift detection of a burst with optical afterglow
  70. Konus-Wind observation of GRB 081209
  71. IPN triangulation of short hard GRB 081209
  72. GRB 081203A: optical observations
  73. GRB 081206C: Fermi GBM detection
  74. GRB 081206B: Fermi GBM detection
  75. GRB 081206: Fermi GBM detection
  76. GRB 081128: afterglow observations
  77. GRB 081203B: Suzaku WAM observation of the prompt emission
  78. GRB 081203B: Additional Gemini imaging
  79. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  80. GRB 081128: optical observation in CrAO
  81. GRB 081128: Optical afterglow observations
  82. GRB 081204: GROND Observations
  83. GRB081203B: optical observations
  84. Radio detection of GRB 081203B with the VLA
  85. GRB 081204: Magellan observations
  86. GRB081203A: Radio upper limit at 15 GHz
  87. GRB 081204B: Fermi GBM detection
  88. GRB 081204: Swift/UVOT Upper Limits
  89. GRB 081204: Swift XRT afterglow confirmation
  90. GRB081203A: MITSuME optical observation
  91. GRB 081203A: Optical observations of Xinglong TNT telescope
  92. GRB 081204: Swift XRT afterglow candidate
  93. GRB081203A: optical observation
  94. GRB 081204 : a long GRB localized by INTEGRAL
  95. VLA Radio upper limit on GRB 081203A
  96. Swift-XRT observations of GRB 081203B
  97. Konus-Wind observation of GRB 081203A
  98. Konus-Wind observation of GRB 081203B
  99. GRB081203A: Swift-XRT refined analysis
  100. GRB 081203B: optical observations

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