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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"

19534 results found.

  1. GRB 130606B: Swift/UVOT Upper Limit
  2. GRB 130610A: Swift-XRT refined Analysis
  3. GRB 130609B: Swift-XRT refined Analysis
  4. GRB 130610A: Enhanced Swift-XRT position
  5. GRB 130608A: Further Swift-BAT analysis
  6. GRB 130610A, Swift-BAT refined analysis
  7. GRB 130609B: Enhanced Swift-XRT position
  8. GRB 130610A: P60 Observations
  9. GRB 130610A: PAIRITEL NIR Afterglow Observations
  10. GRB 130610A: Skynet/PROMPT detection of the optical afterglow
  11. GRB 130610A - Liverpool Telescope Optical Afterglow Confirmation
  12. GRB 130610A: Swift detection of a burst with an optical counterpart
  13. GRB 130609B: Swift detection of a burst with an optical counterpart
  14. GRB 130609A: Fermi GBM observation
  15. GRB 130608A: Swift-XRT refined Analysis
  16. GRB 130609A: Swift-XRT refined Analysis
  17. GRB 130608A: RATIR Optical and NIR Observations
  18. GRB 130609A: Enhanced Swift-XRT position
  19. GRB 130609A, Swift-BAT refined analysis
  20. GRB 130608A: Swift-BAT refined analysis
  21. GRB 130608A: Enhanced Swift-XRT position
  22. GRB 130609A: RATIR Optical and NIR Observations
  23. GRB 130609A: Swift detection of a burst
  24. GRB 130608A: Swift detection of a burst
  25. GRB 130606A: Continued Skynet/PROMPT observations
  26. Swift Trigger 557674 was due to an onboard position error
  27. Swift Trigger 557674 is a probable new Galactic transient
  28. GRB 130606B: Swift-XRT observations
  29. GRB 130606A, Swift-BAT refined analysis
  30. GRB 130606A: TAROT Calern observatory early optical observations
  31. GRB 130606A: Skynet/PROMPT detection of the optical afterglow
  32. GRB 130606A: Swift/UVOT Upper Limits
  33. GRB 130603A: AAO optical observations
  34. GRB 130606A: Swift-XRT refined Analysis
  35. GRB 130606A: Enhanced Swift-XRT position
  36. Konus-Wind observation of GRB 130605A
  37. Konus-Wind observation of GRB 130606A
  38. GRB 130606A: GROND Detection of the Optical/NIR Afterglow
  39. GRB 130606A: AAO optical observations
  40. Trigger 557640: Swift detection of burst from SGR J1745-29
  41. GRB 130606A: PAIRITEL NIR Afterglow Observations
  42. GRB 130606A:T100 observations
  43. GRB 130606B: Fermi-LAT detection of a bright hard burst
  44. GRB130606A: Montarrenti Observatory afterglow detection
  45. GRB 130605A: Swift-XRT refined Analysis
  46. GRB 130605A: Swift-BAT refined analysis
  47. Swift Trigger 557466 is not astrophysical
  48. GRB 130606A - Liverpool Telescope Optical Afterglow Confirmation
  49. GRB 130606A: optical afterglow with BOOTES-2/TELMA and 1.23m CAHA
  50. GRB 130606A: Swift detection of a burst
  51. GRB 130605A: Swift/UVOT Detection
  52. GRB 130604A: Swift-BAT refined analysis
  53. GRB 130605A: Continued Skynet/PROMPT observations
  54. GRB 130605A: Skynet/PROMPT detection of a fading afterglow
  55. GRB 130605A: TAROT La Silla observatory optical detection of the afterglow
  56. GRB 130605A: GROND afterglow candidate
  57. GRB 130605A: Swift detection of a burst
  58. Konus-Wind observation of GRB 130603B
  59. GRB 130603B: MASTER-Net early observations and optical sloap limit
  60. GRB 130604A: Swift/UVOT Upper Limits
  61. Swift Trigger 557466 is probably not real.
  62. GRB 130604A: Swift-XRT refined Analysis
  63. GRB 130604A: Enhanced Swift-XRT position
  64. GRB 130604A: Gemini North Spectroscopy
  65. GRB 130603B: P60 Observations
  66. GRB130603B: Swift/UVOT detection
  67. GRB 130604A: further ISON-NM optical observation
  68. GRB 130604A: ISON-NM optical upper limit
  69. GRB 130604A: Swift detection of a burst
  70. GRB 130603B: Swift-XRT refined Analysis
  71. GRB 130603B: Swift-BAT Spectral lag analysis
  72. GRB 130603B: Swift-BAT refined analysis
  73. GRB 130603A: Swift-XRT refined Analysis
  74. GRB 130603B: Enhanced Swift-XRT position
  75. Swift/UVOT observations of GRB130603A
  76. GRB 130603A: Enhanced Swift-XRT position
  77. GRB 130603A: Swift-BAT refined analysis
  78. GRB 130603B: Swift detection of a bright short burst
  79. GRB 130603A: Swift-XRT observations
  80. GRB 130603A: Swift-XRT and Swift-UVOT detections
  81. GRB 130603A: Swift detection of a burst
  82. GRB 130529A: GROND upper limits
  83. GRB 130528A: Fermi GBM detection
  84. GRB 130529A: Swift/UVOT Upper Limits
  85. GRB 130527A: Suzaku WAM observation of the prompt emission
  86. GRB 130529A: Swift-BAT refined analysis
  87. GRB 130518A: Suzaku WAM observation of the prompt emission
  88. GRB 130529A: Swift-XRT refined Analysis
  89. GRB 130529A: Enhanced Swift-XRT position
  90. Konus-Wind observation of GRB 130528A
  91. GRB 130528A: Swift/UVOT Upper Limits
  92. Konus-Wind observation of GRB 130527A
  93. GRB 130529A: Prompt enhanced Swift-XRT position
  94. GRB 130528A: Swift-BAT refined analysis
  95. GRB 130529A: Swift detection of a burst
  96. GRB 130528A: Swift-XRT refined Analysis
  97. GRB 130527A: Swift/UVOT Upper Limits
  98. GRB 130528A: Enhanced Swift-XRT position
  99. GRB 130521A: Skynet/PROMPT detection of an extremely red afterglow
  100. GRB 130528A: Swift detection of a burst

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