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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

15987 results found.

  1. GRB 081128A: optical observations
  2. GRB 081128: Liverpool Telescope afterglow confirmation
  3. GRB081128: optical observations
  4. GRB081128 : Lulin optical follow-ups
  5. GRB 081128: Optical observation of xinglong TNT
  6. GRB 081126: GRT Optical Observation
  7. GRB 081126: Confirmation of the Optical Afterglow
  8. GRB 081126: optical observations
  9. GRB 081126: TAROT Calern observatory optical observations
  10. GRB 081121, SMARTS optical/IR afterglow observations
  11. GRB081121: Fermi GBM detection
  12. GRB081121: Refined Swift/UVOT observations
  13. GRB 081121: Swift-XRT refined analysis
  14. GRB 081121: Magellan Redshift
  15. GRB 081121: GROND observations
  16. GRB081121: Swift/UVOT observations
  17. GRB 081121: ROTSE-III Detection of Optical Counterpart
  18. GRB081118 : optical upper limit
  19. GRB 081016b, SMARTS optical/IR observations
  20. VLA Radio upper limit on GRB 081118
  21. GRB 081118: VLT redshift
  22. GRB 081118: optical afterglow candidate
  23. GRB 081109A: confirmation of possible detection host galaxy
  24. GRB 081102: RTT150 Optical observations
  25. GRB 081110: MASTER: first optical observations Fermi GRB
  26. GRB 081109: TAROT La Silla observatory optical observations
  27. GRB 081102: MASTER refind and final results
  28. GRB 081109B: Swift/UVOT refined analysis
  29. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  30. GRB 081109A: Possible Swift-UVOT detection
  31. GRB 081109: Swift/UVOT upper limits
  32. GRB 081109A optical upper limit
  33. Swift-BAT Trigger 334129: possible burst
  34. GRB 081109: REM NIR afterglow detection
  35. GRB 081028 - PAIRITEL NIR detection
  36. GRB 081104: GROND found no Optical/NIR Afterglow
  37. UVOT/Swift observations of GRB081105
  38. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  39. GRB081104: Swift/UVOT Upper Limits
  40. GRB 081104 : Faulkes Telescope South observations
  41. GRB 081102: MASTER prompt optical limit
  42. GRB 081102: Swift/UVOT refined analysis
  43. GRB 081102: OPTIMA-Burst optical upper limit
  44. SGR 0501+4516: optical observations in August
  45. GRB 081024B: BTA deep optical observations
  46. GRB 081028: CrAO optical observations
  47. GRB 081024B: new Swift-XRT observations
  48. GRB 081029, SMARTS optical/IR afterglow observations
  49. GRB 081029: UVOT Detection of the Optical Afterglow
  50. GRB 081029: Redshift Confirmation from Gemini-South
  51. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  52. GRB 081029: REM observations
  53. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  54. GRB 081029: ROTSE-III Detection of Optical Counterpart
  55. GRB 081028: Magellan redshift
  56. GRB081028: UVOT detection of a brightening afterglow
  57. Swift UVOT observations of GRB081028
  58. GRB 081028: TAROT Calern observatory optical observations
  59. GRB 081028: optical observations at the NOT
  60. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  61. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  62. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  63. GRB081025: RTT150 optical observations
  64. Swift UVOT observations of GRB081025
  65. Swift UVOT observations of GRB081024B
  66. Swift UVOT observations of GRB 081024
  67. GRB 081024: Faulkes Telescope North optical observations
  68. GRB 081024: KAIT Optical Limits
  69. GRB 081024A: ROTSE-III Optical Limits
  70. GRB 081016B: Swift/UVOT Upper Limits
  71. GRB 081016B: ROTSE-III Optical Limits
  72. Swift-BAT triggered on the flare star Algol
  73. GRB 080430: optical observations
  74. GRB 081008 optical upper limit
  75. GRB 081012: Swift/UVOT analysis of initial observations
  76. GRB 081012: ROTSE-III Optical Limits
  77. GRB081011: UVOT detection of an optical afterglow
  78. GRB 081008, SMARTS optical/IR afterglow observations
  79. GRB 081007: Radio Detection
  80. GRB 081008: VLT redshift confirmation
  81. GRB 081008: Gemini-South Absorption Redshiftt
  82. GRB 081008: Swift detection of a burst with optical afterglow
  83. GRB 081008: ROTSE-III Detection of Optical Counterpart
  84. GRB 081007, SMARTS optical afterglow observations
  85. GRB 081007: Early RAPTOR measurements of optical counterpart
  86. GRB 081007: Gemini-south redshift
  87. GRB 081007, Faulkes Telescope North optical observations
  88. GRB 081007, SMARTS optical/IR afterglow observations
  89. GRB 081007: REM NIR and optical counterpart
  90. GRB 081007: Swift detection of a burst with optical afterglow
  91. GRB 081003B: TAROT Calern observatory optical observations
  92. GRB 081003A: OSN optical observations
  93. GRB081003B: Optical limits from Spain
  94. GRB081001: optical limit from ASH-Centurion
  95. GRB 080928: Watcher observations
  96. GRB080928: Gemini-South Absorption Redshift
  97. GRB 080928: Swift/UVOT observations
  98. GRB 080928: GROND DETECTION
  99. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  100. GRB 080928: Swift detection of a burst with an optical counterpart

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