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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"

31730 results found.

  1. Konus-Wind observation of GRB 081203B
  2. GRB081203A: Swift-XRT refined analysis
  3. GRB 081203B: optical observations
  4. Swift/UVOT detection of GRB081203B
  5. GRB 081203B: Swift-XRT candidate afterglow.
  6. GRB 081203A: optical observations
  7. Swift UVOT observations of GRB 081203A
  8. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  9. GRB081203A: Swift/UVOT grism redshift
  10. GRB 081203A: Burst detection from Swift-BAT slew data
  11. GRB 081203A: Swift-BAT refined analysis
  12. GRB 081130B: MASTER prompt optical observations
  13. GRB081203: optical observation
  14. GRB 081128: optical observation
  15. Swift Trigger 335971: Swift/UVOT Observations
  16. GRB 081126: afterglow photometry
  17. GRB 081126: Fermi GBM detection
  18. VLA Radio upper limit on GRB 081126
  19. GRB 081128A: optical observations
  20. GRB081128: Swift/UVOT Upper Limits
  21. SGR 1806-20: Fermi GBM detection.
  22. GRB 081128: Swift-XRT refined analysis
  23. GRB 081128: Liverpool Telescope afterglow confirmation
  24. GRB081128: optical observations
  25. GRB081128 : Lulin optical follow-ups
  26. GRB 081128: Swift-BAT refined analysis
  27. GRB 081128: Optical observation of xinglong TNT
  28. GRB081126: Afterglow photometry from Crni Vrh
  29. GRB 081127: Swift/UVOT Upper Limits
  30. GRB 081127: Swift-XRT refined analysis
  31. GRB 081126: Confirmation of the Optical Afterglow
  32. GRB 081127: Swift-BAT refined analysis
  33. Konus-Wind observation of GRB 081126
  34. GRB 081126: Swift-XRT refined analysis
  35. GRB 081126: Swift/UVOT Observations
  36. GRB 081126: optical observations
  37. GRB 081126: Swift-BAT refined analysis
  38. Konus-Wind observation of GRB 081121
  39. GRB 081121, SMARTS optical/IR afterglow observations
  40. GRB081121: Fermi GBM detection
  41. GRB081121: Refined Swift/UVOT observations
  42. GRB 081121: Swift-XRT refined analysis
  43. GRB 081121: GROND observations
  44. GRB 081121: Swift-BAT refined analysis
  45. GRB081121: Swift/UVOT observations
  46. GRB 081121: ROTSE-III Detection of Optical Counterpart
  47. GRB081118 : optical upper limit
  48. GRB 081016b, SMARTS optical/IR observations
  49. VLA Radio upper limit on GRB 081118
  50. GRB 081118: VLT redshift
  51. GRB 081118: Swift-XRT refined analysis
  52. GRB 081118: GROND detection of afterglow
  53. GRB 081118: optical afterglow candidate
  54. GRB 081118: Swift UVOT Upper Limits
  55. GRB 081118: Swift-BAT refined analysis
  56. GRB 081109A: confirmation of possible detection host galaxy
  57. Further Swift-XRT observations of the probable GRB 081105.
  58. GRB 081102: MASTER refind and final results
  59. GRB 081109: GROND redshift limit and host extinction
  60. GRB 081025: Swift-XRT further analysis
  61. GRB 081024B: Swift-XRT late-time observations
  62. Swift-BAT refined analysis of trigger 334129
  63. GRB 081109B: Swift/UVOT refined analysis
  64. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  65. GRB 081109A: Possible Swift-UVOT detection
  66. GRB 081109A: Faulkes Telescope South observations
  67. GRB 081109A, Swift-BAT refined analysis
  68. GRB 081109A: Swift-XRT refined analysis
  69. GRB 081109: Fermi GBM detection
  70. GRB 081109: Swift/UVOT upper limits
  71. GRB 081109A optical upper limit
  72. GRB 081109: REM NIR afterglow detection
  73. GRB 081028 - PAIRITEL NIR detection
  74. GRB 081104: GROND found no Optical/NIR Afterglow
  75. GRB 081105: GROND Upper Limits
  76. Radio observation of GRB 080523 with ATCA
  77. Radio observation of GRB 080520 with ATCA
  78. UVOT/Swift observations of GRB081105
  79. Swift-XRT observations of GRB 081105
  80. Radio observation of GRB 080516 with ATCA
  81. GRB 081025: Fermi GBM observation
  82. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  83. GRB 081104: refined XRT analysis
  84. GRB 081104: Swift-BAT refined analysis
  85. GRB081104: Swift/UVOT Upper Limits
  86. Fermi-GBM detection of a Solar Flare
  87. Fermi Detection of GRB 081102
  88. GRB 081104 : Faulkes Telescope South observations
  89. GRB 081104: Swift-XRT position
  90. Radio observation of GRB 080130 with ATCA
  91. GRB 081102: MASTER prompt optical limit
  92. GRB 081102: Swift-XRT refined analysis
  93. GRB 081102: Swift/UVOT refined analysis
  94. GRB 081102: Swift-BAT refined analysis
  95. Radio observation of GRB 080218b with ATCA
  96. Radio observation of GRB 080229a with ATCA
  97. GRB 081102: MASTER VWF promt observation
  98. GRB 081102: OPTIMA-Burst optical upper limit
  99. SGR 0501+4516: optical observations in August
  100. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection

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