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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"

27321 results found.

  1. GRB 130831B: Enhanced Swift-XRT position
  2. GRB 130831A: Skynet/PROMPT-SSO detections
  3. GRB 130831A: Enhanced Swift-XRT position
  4. GRB 130831A: MITSuME Akeno Optical observation
  5. GRB 130831A: Weihai optical observations
  6. GRB 130831B: Swift detection of a burst
  7. GRB 130831A: Faulkes Telescope North and South optical afterglow
  8. GRB 130831A: Swift detection of a burst with an optical counterpart
  9. GRB 130822A: optical upper limits
  10. GRB 130829A: AAO optical observations
  11. GRB 130828A: Swift XRT and UVOT observations
  12. GRB 130829A: NOT optical observations
  13. IPN triangulation of GRB 130828A
  14. GRB 130829A: Swift detection of a burst
  15. GRB 130828A: Fermi GBM detection
  16. GRB 130828A: Fermi-LAT detection of a burst
  17. GRB 130822A Swift-BAT Spectral lag analysis
  18. GRB 130821A: Weihai optical upper limit
  19. GRB 130821A: Swift-XRT observation
  20. GRB 130822A: 5.8 GHz VLA upper limit
  21. GRB 130822A: Swift-XRT refined Analysis
  22. GRB 130822A: Swift/UVOT Upper Limits
  23. GRB 130822A: Enhanced Swift-XRT position
  24. GRB 130822A, Swift-BAT refined analysis
  25. GRB 130821A: Fermi-LAT detection of a burst
  26. GRB 130822A: Weihai optical upper limit
  27. GRB 130821A: Fermi GBM Detection
  28. GRB 130822A: Swift detection of a short burst
  29. GRB 130816A: Swift/UVOT Upper Limits
  30. GRB 130816B: Swift/UVOT Upper Limits
  31. GRB 130816B, Swift-BAT refined analysis
  32. GRB 130816B: GROND afterglow candidate
  33. GRB 130816A: Swift-XRT refined Analysis
  34. GRB 130816A, Swift-BAT refined analysis
  35. GRB 130816A: Fermi GBM observation
  36. GRB 130816B: Swift-XRT refined Analysis
  37. GRB 130816B: Enhanced Swift-XRT position
  38. GRB 130816A: GROND confirmation of afterglow
  39. GRB 130816A: Enhanced Swift-XRT position
  40. GRB 130816B: Swift detection of a burst
  41. GRB 130816A: REM NIR candidate afterglow
  42. GRB 130816A: Swift detection of a burst
  43. IPN Triangulation of GRB 130812B (long/soft)
  44. GRB 130812A: Swift/UVOT Upper Limits
  45. GRB 130812A, Swift-BAT refined analysis
  46. GRB 130812A: GROND upper limits
  47. GRB 130812A: Swift-XRT refined Analysis
  48. GRB 130812A: Enhanced Swift-XRT position
  49. GRB 130812A: Swift detection of a burst
  50. GRB130807A: Swift/UVOT observations
  51. GRB 130807A: Swift-XRT refined analysis
  52. GRB 130806A: Swift/UVOT Upper Limits
  53. GRB 130807A, Swift-BAT refined analysis
  54. GRB 130807A: Swift detection of a GRB or Galactic transient
  55. Konus-Wind observation of GRB 130804A
  56. GRB 130623A: GROND detection of the optical/NIR afterglow
  57. GRB 130806A: MITSuME Akeno Optical observation
  58. GRB 130806A: Swift-XRT refined Analysis
  59. GRB 130806A: MITSuME Okayama upper limits
  60. GRB 130806A, Swift-BAT refined analysis
  61. IPN localization of GRB 130804A
  62. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  63. GRB130803A: GROND observations
  64. GRB 130806A: Enhanced Swift-XRT position
  65. GRB 130806A: Swift detection of a burst
  66. GRB 130804A; Fermi GBM observation
  67. Trigger 565443: Swift detection of a burst from SGR J1745-29
  68. GRB 130803A: Swift-XRT refined Analysis
  69. GRB 130803A: RATIR Optical and NIR Observations
  70. GRB130803A: GROND detection of possible host
  71. GRB 130803A: Swift/UVOT Upper Limits
  72. GRB 130803A; Fermi GBM observation
  73. GRB 130803A, Swift-BAT refined analysis
  74. GRB 130803A: Enhanced Swift-XRT position
  75. GRB 130803A: Faulkes Telescope South Observations
  76. GRB 130803A: Swift detection of a burst
  77. GRB 130727A: Watcher optical limit
  78. GRB 130722A: RATIR Optical Observations
  79. GRB 130727A: Swift/UVOT Detection
  80. GRB 130727A: Swift-XRT refined Analysis
  81. GRB 130727A: Fermi GBM detection
  82. GRB 130727A: GROND observations
  83. GRB 130727A: Enhanced Swift-XRT position
  84. GRB 130727A: Swift-BAT refined analysis
  85. GRB 130727A: Swift-XRT observations
  86. GRB 130727A: Swift-XRT and Swift-UVOT prompt observations
  87. GRB 130725B: Swift/UVOT Observations
  88. GRB 130725A: Swift-XRT refined Analysis
  89. GRB 130725B, Swift-BAT refined analysis
  90. GRB 130725B: Swift-XRT refined Analysis
  91. GRB130725B: REM-ROS2 optical observations
  92. GRB 130725B - UVOT-enhanced XRT position
  93. GRB 130725A: Swift/UVOT Upper Limits
  94. GRB 130725A - Faulkes Telescope South Observations
  95. GRB 130725B: GROND Detection of the Optical/NIR Afterglow
  96. GRB 130725A: MITSuME Ishigakijima Optical Observation
  97. GRB 130725B: Swift/UVOT Detection of an Optical Counterpart
  98. GRB 130725A, Swift-BAT refined analysis
  99. GRB 130719A: Skynet/PROMPT observations
  100. Swift Trigger 563980 is GRB 130725A

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