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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"

23685 results found.

  1. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  2. GRB 081109A: Possible Swift-UVOT detection
  3. GRB 081109A: Faulkes Telescope South observations
  4. GRB 081109A, Swift-BAT refined analysis
  5. GRB 081109: Swift/UVOT upper limits
  6. Swift-BAT Trigger 334129: possible burst
  7. GRB 081109: REM NIR afterglow detection
  8. GRB 081109: Swift detection of a burst
  9. GRB 081028 - PAIRITEL NIR detection
  10. GRB 081024C: Fermi Gamma-ray Burst Monitor detection
  11. SGR 1806-20: Fermi GBM detection
  12. GRB 081105: GROND Upper Limits
  13. GRB 081105 Swift/BAT and IPN Localization
  14. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  15. GRB 081104: Enhanced Swift-XRT position
  16. GRB 081104: Swift-BAT refined analysis
  17. GRB081104: Swift/UVOT Upper Limits
  18. GRB 081104 : Faulkes Telescope South observations
  19. GRB 081104: Swift detection of a burst
  20. GRB 081102: MASTER prompt optical limit
  21. GRB 081102: Swift-BAT refined analysis
  22. GRB 081102: MASTER VWF promt observation
  23. GRB 081102: Swift detection of a burst
  24. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  25. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  26. GRB 081024B: BTA deep optical observations
  27. GRB 081029: PROMPT Detections
  28. GRB 081029: Swift-BAT refined analysis
  29. GRB 081025: Suzaku WAM observation of the prompt emission
  30. GRB 081024B: Suzaku WAM observation of the prompt emission
  31. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  32. GRB 081029: Swift detection of a burst
  33. GRB 081028: Magellan redshift
  34. GRB 081028: Swift-XRT refined analysis
  35. GRB 081028, Swift-BAT refined analysis
  36. GRB 081028: TAROT Calern observatory optical observations
  37. GRB 081028: optical observations at the NOT
  38. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  39. GRB 081028: Swift detection of a burst
  40. GRB081025: RTT150 optical observations
  41. GRB081024B: P200 Observations
  42. Konus-Wind observation of GRB 081025
  43. Swift UVOT observations of GRB 081024
  44. GRB 081024, Swift-BAT refined analysis
  45. GRB 081024: Faulkes Telescope North optical observations
  46. GRB 081024: KAIT Optical Limits
  47. GRB 081024: Early Super-LOTIS Observations
  48. GRB 081024: Swift detection of a burst
  49. GRB 081022, Swift-BAT refined analysis
  50. GRB 081022: Swift detection of a burst
  51. Swift detection of a possible burst (trigger 332287)
  52. GRB 081017, Swift-BAT refined analysis
  53. GRB 081017: Swift detection of a burst
  54. GRB 081016B, Swift-BAT refined analysis
  55. GRB 081016B: Swift detection of a burst
  56. Swift detection of flare on CC Eri
  57. GRB 081016: A long GRB discovered by INTEGRAL
  58. Trigger 331721 Due to Swift startracker loss-of-lock
  59. Swift-BAT triggered on the flare star Algol
  60. GRB 081012: Swift/UVOT analysis of initial observations
  61. GRB 081012: Swift/XRT detection
  62. GRB 081012, Swift-BAT refined analysis
  63. GRB 081012: Swift detection of a burst
  64. GRB 081011, Swift-BAT refined analysis
  65. GRB 081011: Swift detection of a burst
  66. Konus-Wind observation of GRB 081001
  67. GRB 081007: Rapid PROMPT Detections
  68. GRB 081008, Swift-BAT refined analysis
  69. GRB 081008: Swift detection of a burst with optical afterglow
  70. GRB081006B: Fermi GBM detection
  71. GRB081006: Fermi GBM detection
  72. GRB 081007, Swift-BAT refined analysis
  73. GRB 081007: Gemini-south redshift
  74. GRB 081007: Swift detection of a burst with optical afterglow
  75. GRB081003C: GLAST Burst Monitor detection
  76. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  77. GRB 081003B: TAROT Calern observatory optical observations
  78. GRB 081003A: OSN optical observations
  79. GRB 081001: Further observations from OSN
  80. GRB 081003A: Swift-XRT Team position and analysis
  81. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  82. GRB 081003B: a long GRB detected with INTEGRAL
  83. GRB 080928: Fermi GBM detection
  84. GRB 081003: A long GRB discovered by INTEGRAL
  85. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  86. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  87. Trigger 330353: Swift detection of a Galactic short soft burst
  88. GRB 081001: Observations from OSN
  89. GRB 080925: Suzaku WAM observation of the prompt emission
  90. GRB081001: SuperAGILE Localization of a long GRB
  91. GRB 080928: VLT redshift
  92. GRB 080928: Swift/UVOT observations
  93. GRB 080928, Swift-BAT final refined analysis
  94. GRB 080928, Swift-BAT initial refined analysis
  95. GRB 080928: Swift detection of a burst with an optical counterpart
  96. GRB 080925: Fermi GBM Detection
  97. GRB 080920: Fermi GBM detection
  98. GRB080922, optical upper limit
  99. Swift detection of a possible GRB (trigger 325707)
  100. GRB080916A: Suzaku WAM observation of the prompt emission

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