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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"

16186 results found.

  1. Radio observation of GRB 081109 with ATCA
  2. Radio observation of GRB 081104 with ATCA
  3. Radio observation of GRB 081029 with ATCA
  4. Radio observation of GRB 081008 with ATCA
  5. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  6. GRB 081203B: Gemini observations
  7. GRB 081128: optical observation in CrAO
  8. GRB081203A: Optical observations at Ishigaki
  9. GRB 081128: Optical afterglow observations
  10. GRB081203B: optical observations
  11. Radio detection of GRB 081203B with the VLA
  12. GRB081203A: Radio upper limit at 15 GHz
  13. GRB 081204: Swift/UVOT Upper Limits
  14. GRB081203A: MITSuME optical observation
  15. GRB 081203A: Optical observations of Xinglong TNT telescope
  16. GRB081203A: optical observation
  17. GRB 081203B: optical observations
  18. GRB 081203B: SDSS upper limits at the position of the optical afterglow
  19. GRB 081203A: optical observations
  20. Swift UVOT observations of GRB 081203A
  21. GRB 081130B: MASTER prompt optical observations
  22. GRB081203: optical observation
  23. GRB 081203: Swift detection of a burst with a bright optical counterpart
  24. GRB 081128: optical observation
  25. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  26. GRB 081128A: optical observations
  27. GRB 081128: Liverpool Telescope afterglow confirmation
  28. GRB081128: optical observations
  29. GRB081128 : Lulin optical follow-ups
  30. GRB 081128: Optical observation of xinglong TNT
  31. GRB 081126: GRT Optical Observation
  32. GRB 081126: Confirmation of the Optical Afterglow
  33. GRB 081126: optical observations
  34. GRB 081126: TAROT Calern observatory optical observations
  35. GRB 081121, SMARTS optical/IR afterglow observations
  36. GRB081121: Fermi GBM detection
  37. GRB081121: Refined Swift/UVOT observations
  38. GRB 081121: Swift-XRT refined analysis
  39. GRB 081121: Magellan Redshift
  40. GRB 081121: GROND observations
  41. GRB081121: Swift/UVOT observations
  42. GRB 081121: Swift detection of a burst
  43. GRB 081121: ROTSE-III Detection of Optical Counterpart
  44. GRB081118 : optical upper limit
  45. GRB 081016b, SMARTS optical/IR observations
  46. VLA Radio upper limit on GRB 081118
  47. GRB 081118: VLT redshift
  48. GRB 081118: optical afterglow candidate
  49. GRB 081109A: confirmation of possible detection host galaxy
  50. GRB 081102: RTT150 Optical observations
  51. GRB 081110: MASTER: first optical observations Fermi GRB
  52. GRB 081109: TAROT La Silla observatory optical observations
  53. GRB 081102: MASTER refind and final results
  54. GRB 081109B: Swift/UVOT refined analysis
  55. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  56. GRB 081109A: Possible Swift-UVOT detection
  57. GRB 081109: Swift/UVOT upper limits
  58. GRB 081109A optical upper limit
  59. Swift-BAT Trigger 334129: possible burst
  60. GRB 081109: REM NIR afterglow detection
  61. GRB 081028 - PAIRITEL NIR detection
  62. GRB 081104: GROND found no Optical/NIR Afterglow
  63. UVOT/Swift observations of GRB081105
  64. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  65. GRB081104: Swift/UVOT Upper Limits
  66. GRB 081104 : Faulkes Telescope South observations
  67. GRB 081102: MASTER prompt optical limit
  68. GRB 081102: Swift/UVOT refined analysis
  69. GRB 081102: OPTIMA-Burst optical upper limit
  70. SGR 0501+4516: optical observations in August
  71. GRB 081024B: BTA deep optical observations
  72. GRB 081028: CrAO optical observations
  73. GRB 081024B: new Swift-XRT observations
  74. GRB 081029, SMARTS optical/IR afterglow observations
  75. GRB 081029: UVOT Detection of the Optical Afterglow
  76. GRB 081029: Redshift Confirmation from Gemini-South
  77. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  78. GRB 081029: REM observations
  79. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  80. GRB 081029: ROTSE-III Detection of Optical Counterpart
  81. GRB 081028: Magellan redshift
  82. GRB081028: UVOT detection of a brightening afterglow
  83. Swift UVOT observations of GRB081028
  84. GRB 081028: TAROT Calern observatory optical observations
  85. GRB 081028: optical observations at the NOT
  86. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  87. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  88. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  89. GRB081025: RTT150 optical observations
  90. Swift UVOT observations of GRB081025
  91. Swift UVOT observations of GRB081024B
  92. Swift UVOT observations of GRB 081024
  93. GRB 081024: Faulkes Telescope North optical observations
  94. GRB 081024: KAIT Optical Limits
  95. GRB 081024A: ROTSE-III Optical Limits
  96. GRB 081016B: Swift/UVOT Upper Limits
  97. GRB 081016B: ROTSE-III Optical Limits
  98. Swift-BAT triggered on the flare star Algol
  99. GRB 080430: optical observations
  100. GRB 081008 optical upper limit

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