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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"

19592 results found.

  1. GRB 140311A: RATIR Optical and NIR Detection
  2. GRB 140311A: Montarrenti Observatory optical upper limit
  3. GRB 140311B: Fermi GBM Detection
  4. GRB 140311A: Swift/UVOT Upper Limits
  5. GRB 140311B: Swift/UVOT Upper Limits
  6. Fermi416242156: possible iPTF counterpart
  7. GRB 140311B: RATIR Optical and NIR Observations
  8. GRB 140311A: Bassano Bresciano Observatory optical upper limit
  9. GRB 140311A: Swift-XRT refined Analysis
  10. GRO J1744-28: Fermi GBM observation
  11. GRB 140302A: GROND confirmation of the afterglow
  12. GRB 140311B: Swift-XRT refined Analysis
  13. GRB 140311A: Swift-BAT refined analysis
  14. GRB 140311A: Enhanced Swift-XRT position
  15. GRB 140311B: Enhanced Swift-XRT position
  16. GRB 140311B: TAROT Calern observatory optical observations
  17. GRB 140311A: Zadko observatory - Gingin optical observations
  18. GRB140311B: Swift/XRT position
  19. GRB 140311B: Swift-XRT observations
  20. GRB 140311B: MASTER early optical observations
  21. GRB 140311A: MASTER early optical observations
  22. GRB 140311B: Swift detection of a burst
  23. GRB 140311A: Swift detection of a probable burst
  24. GRB 140304A: Suzaku WAM observation of the prompt emission
  25. IPN Triangulation of GRB 140308A
  26. IPN Triangulation of GRB 140306A
  27. GRB 140304A: Continued RATIR Optical and NIR Observations
  28. GRB 140305A: Swift-BAT refined analysis
  29. Trigger 590503: Swift-BAT triggered on noise
  30. GRB 140304A: CARMA 3mm detection
  31. GRB 140305A: Swift detection of a burst
  32. GRB 140304A: RATIR g-band Dropout
  33. GRB 140304A: Swift-BAT refined analysis
  34. GRB 140304A: Swift-XRT refined Analysis
  35. GRB 140304A: Enhanced Swift-XRT position
  36. GRB 140304A: Fermi GBM detection
  37. GRB 140304A: 10.4m GTC redshift z = 5.39
  38. GRB 140304A: Swift/UVOT Upper Limits
  39. GRB 140304A: Afterglow decay from Nanshan observations
  40. GRB 140304A: Swift detection of a burst
  41. GRB 140304A: MASTER OT detecton
  42. GRB 140301A: Swift/UVOT Upper Limits
  43. GRB 140302A: Swift/UVOT Upper Limits
  44. GRB140302A: Fermi GBM detection
  45. GRB 140302A: Swift-XRT refined Analysis
  46. GRB 140302A: Swift-BAT refined analysis
  47. GRB 140302A: Enhanced Swift-XRT position
  48. GRB 140301A: Swift-BAT refined analysis
  49. GRB 140301A: Swift-XRT refined Analysis
  50. GRB 140301A: GROND Detection of the Optical/NIR Afterglow
  51. GRB 140302A: GROND afterglow candidate
  52. GRB 140302A: Prompt enhanced Swift-XRT position
  53. GRB 140302A: Swift detection of a burst
  54. GRB 140301A: Enhanced Swift-XRT position
  55. GRB 140301A: Skynet R-COP Observations
  56. GRB 140301A: Swift detection of a burst
  57. GRB 140226A/iPTF14yb: Swift/UVOT Observations
  58. GRB 140226A / iPTF14yb: Swift-XRT confirms a fading X-ray source
  59. IPN triangulation of GRB 140226A, a possible GRB counterpart to iPTF14yb
  60. iPTF14yb: Swift-XRT detection
  61. GRB 140219A: Retraction of X-ray afterglow
  62. GRB 140102A: TAOS early optical afterglow detection
  63. GRB 140219A: XRT afterglow candidate
  64. GRB 140221A: Results from Swift XRT tiled observations
  65. GRB 140219A: Xuyi and Nanshan upper limits
  66. GRB 140219A: results from Swift XRT and UVOT tiled observations
  67. GRB 140221A Tiled Swift observations
  68. GRB 140219A Tiled Swift observations
  69. Swift follow-up of an Integral weak transient
  70. GRB 140213A: Continued Skynet R-COP/PROMPT Observations of the Optical Afterglow
  71. GRB 140215A: RAPTOR Observations During Gamma-Ray Emitting Interval
  72. GRB 140213A: Continued Skynet R-COP/PROMPT Detections of a Rebrightening Optical Afterglow
  73. GRB 140215A: Continued Skynet PROMPT Observations of the Optical Afterglow
  74. GRB 140211A: Khureltogot optical upper limits
  75. GRB 140215A: Continued RATIR Optical and NIR Observations
  76. Konus-Wind observation of GRB 140213A
  77. Konus-Wind observation of GRB 140215A
  78. GRB 140215A: Swift/UVOT Detection
  79. GRB 140211A: Swift-XRT and UVOT observations
  80. GRB140215A: Continued Discovery Channel Telescope Observations
  81. GRB 140215A: Swift-BAT refined analysis
  82. GRB 140215A: ISON-NM optical observations
  83. GRB 140215A: Swift-XRT refined Analysis
  84. GRB 140215A: P60 observations
  85. GRB 140215A: Enhanced Swift-XRT position
  86. GRB 140215A: RATIR Optical and NIR Observations
  87. GRB140215A: Skynet PROMPT Optical Observations
  88. GRB 140215A: KAIT Optical Detection
  89. GRB140215A: Prompt Observations with Discovery Channel Telescope
  90. GRB 140215A: Swift detection of a burst with optical counterpart
  91. GRB 140213A: Swift-BAT refined analysis
  92. GRB140206A: Discovery Channel Telescope Optical Detection
  93. GRB 140213A: Swift/UVOT Observations
  94. GRB 140213A: Fermi GBM Detection
  95. GRB 140213A: Swift-XRT refined Analysis
  96. GRB 140213A: Enhanced Swift-XRT position
  97. GRB 140213A: GROND Detection of the Optical/NIR Afterglow
  98. GRB 140213A: Skynet R-COP Detection of Optical Afterglow
  99. GRB 140213A: Swift-XRT observations
  100. GRB 140213A: Swift/UVOT Detection

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