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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"

32697 results found.

  1. GRB 081126: Swift-XRT refined analysis
  2. GRB 081126: Swift/UVOT Observations
  3. GRB 081126: optical observations
  4. GRB 081126: Swift-BAT refined analysis
  5. Konus-Wind observation of GRB 081121
  6. GRB 081121, SMARTS optical/IR afterglow observations
  7. GRB081121: Fermi GBM detection
  8. GRB081121: Refined Swift/UVOT observations
  9. GRB 081121: Swift-XRT refined analysis
  10. GRB 081121: GROND observations
  11. GRB 081121: Swift-BAT refined analysis
  12. GRB081121: Swift/UVOT observations
  13. GRB 081121: ROTSE-III Detection of Optical Counterpart
  14. GRB081118 : optical upper limit
  15. GRB 081016b, SMARTS optical/IR observations
  16. VLA Radio upper limit on GRB 081118
  17. GRB 081118: VLT redshift
  18. GRB 081118: Swift-XRT refined analysis
  19. GRB 081118: GROND detection of afterglow
  20. GRB 081118: optical afterglow candidate
  21. GRB 081118: Swift UVOT Upper Limits
  22. GRB 081118: Swift-BAT refined analysis
  23. GRB 081109A: confirmation of possible detection host galaxy
  24. Further Swift-XRT observations of the probable GRB 081105.
  25. GRB 081102: MASTER refind and final results
  26. GRB 081109: GROND redshift limit and host extinction
  27. GRB 081025: Swift-XRT further analysis
  28. GRB 081024B: Swift-XRT late-time observations
  29. Swift-BAT refined analysis of trigger 334129
  30. GRB 081109B: Swift/UVOT refined analysis
  31. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  32. GRB 081109A: Possible Swift-UVOT detection
  33. GRB 081109A: Faulkes Telescope South observations
  34. GRB 081109A, Swift-BAT refined analysis
  35. GRB 081109A: Swift-XRT refined analysis
  36. GRB 081109: Fermi GBM detection
  37. GRB 081109: Swift/UVOT upper limits
  38. GRB 081109A optical upper limit
  39. GRB 081109: REM NIR afterglow detection
  40. GRB 081028 - PAIRITEL NIR detection
  41. GRB 081104: GROND found no Optical/NIR Afterglow
  42. GRB 081105: GROND Upper Limits
  43. Radio observation of GRB 080523 with ATCA
  44. Radio observation of GRB 080520 with ATCA
  45. UVOT/Swift observations of GRB081105
  46. Swift-XRT observations of GRB 081105
  47. Radio observation of GRB 080516 with ATCA
  48. GRB 081025: Fermi GBM observation
  49. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  50. GRB 081104: refined XRT analysis
  51. GRB 081104: Swift-BAT refined analysis
  52. GRB081104: Swift/UVOT Upper Limits
  53. Fermi-GBM detection of a Solar Flare
  54. Fermi Detection of GRB 081102
  55. GRB 081104 : Faulkes Telescope South observations
  56. GRB 081104: Swift-XRT position
  57. Radio observation of GRB 080130 with ATCA
  58. GRB 081102: MASTER prompt optical limit
  59. GRB 081102: Swift-XRT refined analysis
  60. GRB 081102: Swift/UVOT refined analysis
  61. GRB 081102: Swift-BAT refined analysis
  62. Radio observation of GRB 080218b with ATCA
  63. Radio observation of GRB 080229a with ATCA
  64. GRB 081102: MASTER VWF promt observation
  65. GRB 081102: OPTIMA-Burst optical upper limit
  66. SGR 0501+4516: optical observations in August
  67. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  68. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  69. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  70. GRB 081024B: BTA deep optical observations
  71. GRB 081028: CrAO optical observations
  72. GRB 081024B: new Swift-XRT observations
  73. Radio observation of GRB 080229b with ATCA
  74. GRB 081029, SMARTS optical/IR afterglow observations
  75. GRB 081024B: VLA radio observation
  76. GRB 081029: PROMPT Detections
  77. GRB 081029: Redshift Confirmation from Gemini-South
  78. GRB 081029: Swift-BAT refined analysis
  79. GRB081029: Swift XRT refined analysis
  80. GRB 081025: Suzaku WAM observation of the prompt emission
  81. GRB 081024B: Suzaku WAM observation of the prompt emission
  82. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  83. GRB 081029: REM observations
  84. Radio observation of GRB 080303 with ATCA
  85. Radio observation of GRB 080411 with ATCA
  86. GRB 081029: UVES/VLT Absorption Redshift
  87. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  88. GRB 081029: ROTSE-III Detection of Optical Counterpart
  89. GRB 081028: Magellan redshift
  90. GRB081028: UVOT detection of a brightening afterglow
  91. Swift UVOT observations of GRB081028
  92. GRB 081028: Swift-XRT refined analysis
  93. GRB 081028, Swift-BAT refined analysis
  94. GRB 081028: TAROT Calern observatory optical observations
  95. GRB 081028: optical observations at the NOT
  96. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  97. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  98. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  99. GRB 081025: TLS upper limits
  100. GRB 081024: No radio detection with the VLA

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