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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"

19356 results found.

  1. GRB 140304A: Swift detection of a burst
  2. GRB 140304A: MASTER OT detecton
  3. GRB 140301A: Swift/UVOT Upper Limits
  4. GRB 140302A: Swift/UVOT Upper Limits
  5. GRB140302A: Fermi GBM detection
  6. GRB 140302A: Swift-XRT refined Analysis
  7. GRB 140302A: Swift-BAT refined analysis
  8. GRB 140302A: Enhanced Swift-XRT position
  9. GRB 140301A: Swift-BAT refined analysis
  10. GRB 140301A: Swift-XRT refined Analysis
  11. GRB 140301A: GROND Detection of the Optical/NIR Afterglow
  12. GRB 140302A: GROND afterglow candidate
  13. GRB 140302A: Prompt enhanced Swift-XRT position
  14. GRB 140302A: Swift detection of a burst
  15. GRB 140301A: Enhanced Swift-XRT position
  16. GRB 140301A: Skynet R-COP Observations
  17. GRB 140301A: Swift detection of a burst
  18. GRB 140226A/iPTF14yb: Swift/UVOT Observations
  19. GRB 140226A / iPTF14yb: Swift-XRT confirms a fading X-ray source
  20. IPN triangulation of GRB 140226A, a possible GRB counterpart to iPTF14yb
  21. iPTF14yb: Swift-XRT detection
  22. GRB 140219A: Retraction of X-ray afterglow
  23. GRB 140102A: TAOS early optical afterglow detection
  24. GRB 140219A: XRT afterglow candidate
  25. GRB 140221A: Results from Swift XRT tiled observations
  26. GRB 140219A: Xuyi and Nanshan upper limits
  27. GRB 140219A: results from Swift XRT and UVOT tiled observations
  28. GRB 140221A Tiled Swift observations
  29. GRB 140219A Tiled Swift observations
  30. Swift follow-up of an Integral weak transient
  31. GRB 140213A: Continued Skynet R-COP/PROMPT Observations of the Optical Afterglow
  32. GRB 140215A: RAPTOR Observations During Gamma-Ray Emitting Interval
  33. GRB 140213A: Continued Skynet R-COP/PROMPT Detections of a Rebrightening Optical Afterglow
  34. GRB 140215A: Continued Skynet PROMPT Observations of the Optical Afterglow
  35. GRB 140211A: Khureltogot optical upper limits
  36. GRB 140215A: Continued RATIR Optical and NIR Observations
  37. Konus-Wind observation of GRB 140213A
  38. Konus-Wind observation of GRB 140215A
  39. GRB 140215A: Swift/UVOT Detection
  40. GRB 140211A: Swift-XRT and UVOT observations
  41. GRB140215A: Continued Discovery Channel Telescope Observations
  42. GRB 140215A: Swift-BAT refined analysis
  43. GRB 140215A: ISON-NM optical observations
  44. GRB 140215A: Swift-XRT refined Analysis
  45. GRB 140215A: P60 observations
  46. GRB 140215A: Enhanced Swift-XRT position
  47. GRB 140215A: RATIR Optical and NIR Observations
  48. GRB140215A: Skynet PROMPT Optical Observations
  49. GRB 140215A: KAIT Optical Detection
  50. GRB140215A: Prompt Observations with Discovery Channel Telescope
  51. GRB 140215A: Swift detection of a burst with optical counterpart
  52. GRB 140213A: Swift-BAT refined analysis
  53. GRB140206A: Discovery Channel Telescope Optical Detection
  54. GRB 140213A: Swift/UVOT Observations
  55. GRB 140213A: Fermi GBM Detection
  56. GRB 140213A: Swift-XRT refined Analysis
  57. GRB 140213A: Enhanced Swift-XRT position
  58. GRB 140213A: GROND Detection of the Optical/NIR Afterglow
  59. GRB 140213A: Skynet R-COP Detection of Optical Afterglow
  60. GRB 140213A: Swift-XRT observations
  61. GRB 140213A: Swift/UVOT Detection
  62. GRB 140213A: Swift detection of a burst
  63. Trigger 586482: Swift detection of GROJ1744-28
  64. Correction to GCN 18521 "GRB140209A: Swift/UVOT observations"
  65. GRB140209A: Swift/UVOT observations.
  66. GRB 140211A: Swift-BAT refined analysis
  67. GRB 140209A: Swift-XRT observations
  68. Konus-Wind observation of GRB 140209A
  69. GRB 140211A: Swift detection of a burst
  70. GRB 140209A: Early RAPTOR Optical Detection
  71. GRB 140209A: Swift-BAT Spectral lag analysis
  72. GRB 140206A: Bassano Bresciano Observatory optical upper limit
  73. GRB 140209A, Swift-BAT refined analysis
  74. GRB 140209A: Fermi GBM observation
  75. GRB 140209A: optical observations
  76. GRB 140209A: P60 optical afterglow detection
  77. GRB 140209A: Swift detection of a burst
  78. GRB 140206A: Mondy optical observations
  79. GRB 140206A: Liverpool Telescope optical afterglow observations
  80. GRB 140206A, Swift-BAT refined analysis
  81. GRB 140206A: Swift-XRT refined Analysis
  82. GRB 140206A: T100 observations
  83. GRB 140206A: Fermi GBM detection
  84. GRB 140206A: Swift/UVOT Detection
  85. GRB 140206A: theoretical prediction of redshift and of supernova occurrence
  86. GRB 140206A: Enhanced Swift-XRT position
  87. GRB 140206A: ISON-Ussuriysk optical observations
  88. GRB 140206B: Fermi-LAT detection
  89. GRB 140206A: Swift/UVOT optical detection
  90. GRB140206A: a long GRB detected by INTEGRAL
  91. GRB 140206A: Swift detection of a burst
  92. GRB 140129A: 5 GHz VLA observations
  93. GRB 140129A: Khureltogot optical limit
  94. GRB 140129B: Swift/UVOT Detection
  95. GRB 140129A: Continued RATIR Optical and NIR Observations
  96. GRB 140129B: Swift-XRT refined Analysis
  97. GRB 140129B: MASTER OT early light curve
  98. GRB 140129B, Swift-BAT refined analysis (probably not a short burst)
  99. GRB140129A: RAPTOR Observations of the Early Afterglow
  100. GRB 140129B: Enhanced Swift-XRT position

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