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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. IPN triangulation of GRB 130828A - error box
  2. GRB 130822A: optical upper limits
  3. GRB 130829A: AAO optical observations
  4. GRB 130828A: Swift XRT and UVOT observations
  5. IPN triangulation of GRB 130828A
  6. GRB 130829A: Swift detection of a burst
  7. GRB 130828A Tiled Swift observations
  8. IPN triangulation of GRB130821A
  9. GRB 130822A Swift-BAT Spectral lag analysis
  10. GRB 130821A: Swift-XRT observation
  11. GRB 130822A: Gemini Observations
  12. GRB 130822A: Swift-XRT refined Analysis
  13. GRB 130822A: Swift/UVOT Upper Limits
  14. GRB 130822A: Enhanced Swift-XRT position
  15. GRB 130822A, Swift-BAT refined analysis
  16. GRB 130821A: Fermi-LAT detection of a burst
  17. GRB 130822A: Swift detection of a short burst
  18. GRB 130816A: Swift/UVOT Upper Limits
  19. GRB 130816B: Swift/UVOT Upper Limits
  20. GRB 130816B, Swift-BAT refined analysis
  21. GRB 130816B: GROND afterglow candidate
  22. GRB 130816A: Swift-XRT refined Analysis
  23. GRB 130816A, Swift-BAT refined analysis
  24. GRB 130816A: Fermi GBM observation
  25. GRB 130816B: Swift-XRT refined Analysis
  26. GRB 130816B: Enhanced Swift-XRT position
  27. GRB 130816A: GROND confirmation of afterglow
  28. GRB 130816A: Enhanced Swift-XRT position
  29. GRB 130816B: Swift detection of a burst
  30. GRB 130816A: Swift detection of a burst
  31. Refined IPN Triangulation of GRB 130812B
  32. IPN Triangulation of GRB 130812B (long/soft)
  33. GRB 130812A: Swift/UVOT Upper Limits
  34. GRB 130812A, Swift-BAT refined analysis
  35. GRB 130812A: GROND upper limits
  36. GRB 130812A: Swift-XRT refined Analysis
  37. GRB 130812A: Enhanced Swift-XRT position
  38. GRB 130812A: Swift detection of a burst
  39. Correction to GCN Circ. 15086 "GRB130807A: Swift/UVOT observations"
  40. GRB130807A: Swift/UVOT observations
  41. GRB 130807A: Swift-XRT refined analysis
  42. GRB 130806A: Swift/UVOT Upper Limits
  43. GRB 130807A, Swift-BAT refined analysis
  44. GRB 130807A: Swift detection of a GRB or Galactic transient
  45. GRB 130623A: GROND detection of the optical/NIR afterglow
  46. GRB 130806A: Swift-XRT refined Analysis
  47. GRB 130806A, Swift-BAT refined analysis
  48. IPN localization of GRB 130804A
  49. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  50. GRB130803A: GROND observations
  51. GRB 130806A: Enhanced Swift-XRT position
  52. GRB 130806A: Swift detection of a burst
  53. Trigger 565443: Swift detection of a burst from SGR J1745-29
  54. GRB 130803A: Swift-XRT refined Analysis
  55. GRB 130803A: RATIR Optical and NIR Observations
  56. GRB130803A: GROND detection of possible host
  57. GRB 130803A: Swift/UVOT Upper Limits
  58. GRB 130803A; Fermi GBM observation
  59. GRB 130803A, Swift-BAT refined analysis
  60. GRB 130803A: Enhanced Swift-XRT position
  61. GRB 130803A: Faulkes Telescope South Observations
  62. GRB 130803A: Swift detection of a burst
  63. GRB 130727A: Watcher optical limit
  64. GRB 130727A: Swift/UVOT Detection
  65. Konus-Wind observation of GRB 130727A
  66. GRB 130727A: Swift-XRT refined Analysis
  67. GRB 130727A: Fermi GBM detection
  68. GRB 130727A: GROND observations
  69. GRB 130727A: Enhanced Swift-XRT position
  70. GRB 130727A: Swift-BAT refined analysis
  71. GRB 130727A: Swift-XRT observations
  72. GRB 130727A: Swift-XRT and Swift-UVOT prompt observations
  73. GRB 130727A: Swift detection of a burst
  74. GRB 130725B: Swift/UVOT Observations
  75. GRB 130725B: Swift trigger time correction
  76. GRB 130725A: Swift-XRT refined Analysis
  77. GRB 130725B, Swift-BAT refined analysis
  78. GRB 130725B: Swift-XRT refined Analysis
  79. GRB 130725B - UVOT-enhanced XRT position
  80. GRB 130725A: Swift/UVOT Upper Limits
  81. GRB 130725A - Faulkes Telescope South Observations
  82. GRB 130725B: GROND Detection of the Optical/NIR Afterglow
  83. GRB 130725B: Swift/UVOT Detection of an Optical Counterpart
  84. GRB 130725A, Swift-BAT refined analysis
  85. GRB 130719A: Skynet/PROMPT observations
  86. GRB 130725B: Swift detection of a burst
  87. Swift Trigger 563980 is GRB 130725A
  88. Swift Trigger 563980 cannot be identified at this time.
  89. Retraction of GCN Circ. 15020 (GRB 130722C Tiled Swift observations)
  90. Konus-Wind observation of GRB 130722A
  91. GRB 130722A: Swift/UVOT Detection
  92. GRB 130722C Tiled Swift observations
  93. GRB 130722A: Enhanced Swift-XRT position
  94. GRB 130722A: Swift-XRT refined Analysis
  95. GRB 130722A: Skynet/GORT observations
  96. GRB 130719A, Swift-BAT refined analysis
  97. GRB 130715A: Suzaku WAM observation of the prompt emission
  98. GRB 130722A: Swift detection of a burst
  99. GRB 130719A: Swift detection of a burst
  100. GRB 130716A: Fermi GBM observation

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