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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"

18360 results found.

  1. GRB 081109: GROND redshift limit and host extinction
  2. GRB 081025: Swift-XRT further analysis
  3. GRB 081024B: Swift-XRT late-time observations
  4. GRB 081109B: Swift/UVOT refined analysis
  5. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  6. GRB 081109A: Swift-XRT refined analysis
  7. GRB 081109: Swift/UVOT upper limits
  8. Swift-BAT Trigger 334129: possible burst
  9. GRB 081109: REM NIR afterglow detection
  10. GRB 081109: Swift detection of a burst
  11. GRB 081104: GROND found no Optical/NIR Afterglow
  12. GRB 081105: GROND Upper Limits
  13. Radio observation of GRB 080523 with ATCA
  14. Radio observation of GRB 080520 with ATCA
  15. GRB 081105: Observations from OSN
  16. Swift-XRT observations of GRB 081105
  17. Radio observation of GRB 080516 with ATCA
  18. GRB 081105 Swift/BAT and IPN Localization
  19. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  20. GRB 081104: refined XRT analysis
  21. GRB 081104: Enhanced Swift-XRT position
  22. GRB 081104 : Faulkes Telescope South observations
  23. Radio observation of GRB 080130 with ATCA
  24. GRB 081102: MASTER prompt optical limit
  25. GRB 081102: Swift-XRT refined analysis
  26. GRB 081102: Enhanced Swift-XRT position
  27. Radio observation of GRB 080218b with ATCA
  28. Radio observation of GRB 080229a with ATCA
  29. GRB 081102: MASTER VWF promt observation
  30. GRB 081102: Swift detection of a burst
  31. SGR 0501+4516: optical observations in August
  32. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  33. GRB 081024B: BTA deep optical observations
  34. GRB 081024B: new Swift-XRT observations
  35. Radio observation of GRB 080229b with ATCA
  36. GRB 081024B: VLA radio observation
  37. GRB 081029: UVOT Detection of the Optical Afterglow
  38. GRB 081029: PROMPT Detections
  39. GRB 081025: Suzaku WAM observation of the prompt emission
  40. GRB 081029: Enhanced Swift-XRT position
  41. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  42. GRB 081029: REM observations
  43. Radio observation of GRB 080303 with ATCA
  44. Radio observation of GRB 080411 with ATCA
  45. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  46. Swift UVOT observations of GRB081028
  47. GRB 081028: Swift-XRT refined analysis
  48. GRB 081028: Enhanced Swift-XRT position
  49. GRB 081028: TAROT Calern observatory optical observations
  50. GRB 081028: optical observations at the NOT
  51. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  52. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  53. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  54. GRB 081028: Swift detection of a burst
  55. GRB 081024: No radio detection with the VLA
  56. GRB081025: RTT150 optical observations
  57. GRB081024B: P200 Observations
  58. GRB 081024B: Swift-XRT further observations
  59. GRB 081025 BAT refined analysis
  60. Swift UVOT observations of GRB081024B
  61. GRB 081025: Swift-XRT position
  62. GRB 081024B: Swift-XRT observations
  63. GRB 081025: Burst detection from Swift-BAT slew data
  64. GRB 081024: Enhanced Swift-XRT position
  65. GRB 081024: Faulkes Telescope North optical observations
  66. GRB 081024A: ROTSE-III Optical Limits
  67. GRB 081024: Swift detection of a burst
  68. GRB 081016A: Swift-XRT refined analysis
  69. Swift detection of a possible burst (trigger 332287)
  70. GRB 081017: REM early observations
  71. GRB 081011: Swift XRT refined analysis
  72. GRB 081016B: Enhanced Swift-XRT position
  73. GRB 081016B: ROTSE-III Optical Limits
  74. GRB 081016B: Swift detection of a burst
  75. GRB 081011: Enhanced Swift-XRT position
  76. Swift detection of flare on CC Eri
  77. Trigger 331721 Due to Swift startracker loss-of-lock
  78. Detection of flare star Algol in Swift-BAT slew data
  79. GRB 081009: Fermi GBM detection
  80. GRB 081012: GROND upper limits
  81. Swift-BAT triggered on the flare star Algol
  82. GRB 081012: Observations from NOT
  83. GRB 081012: Swift/XRT detection
  84. GRB081011: UVOT detection of an optical afterglow
  85. GRB 081011: Swift/XRT detection
  86. GRB 081011, Swift-BAT refined analysis
  87. GRB 081008, SMARTS optical/IR afterglow observations
  88. GRB 081011: Swift detection of a burst
  89. GRB 081007: Radio Detection
  90. GRB 081008: Swift-XRT Refined Analysis
  91. GRB081008: Swift/UVOT observations
  92. GRB 081008: Enhanced Swift-XRT position
  93. GRB 081008: Gemini-South Absorption Redshiftt
  94. GRB 081008: Swift detection of a burst with optical afterglow
  95. GRB081006B: Fermi GBM detection
  96. GRB081007: Swift/UVOT Observations
  97. GRB 081007, SMARTS optical afterglow observations
  98. GRB 081007, Swift-BAT refined analysis
  99. GRB 081007: Early RAPTOR measurements of optical counterpart
  100. GRB 081007: Swift-XRT Team refined analysis

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