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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"

19596 results found.

  1. GRB 140318A: Swift detection of a burst
  2. GRB140308A: Suzaku WAM observation of the prompt emission
  3. GRB 140311C: Swift-XRT and UVOT observations
  4. GRB 140311B: Swift-BAT refined analysis
  5. GRB 140311A: RATIR Optical and NIR Detection
  6. GRB 140311A: Montarrenti Observatory optical upper limit
  7. GRB 140311B: Fermi GBM Detection
  8. GRB 140311A: Swift/UVOT Upper Limits
  9. GRB 140311B: Swift/UVOT Upper Limits
  10. Fermi416242156: possible iPTF counterpart
  11. GRB 140311B: RATIR Optical and NIR Observations
  12. GRB 140311A: Bassano Bresciano Observatory optical upper limit
  13. GRB 140311A: Swift-XRT refined Analysis
  14. GRO J1744-28: Fermi GBM observation
  15. GRB 140302A: GROND confirmation of the afterglow
  16. GRB 140311B: Swift-XRT refined Analysis
  17. GRB 140311A: Swift-BAT refined analysis
  18. GRB 140311A: Enhanced Swift-XRT position
  19. GRB 140311B: Enhanced Swift-XRT position
  20. GRB 140311B: TAROT Calern observatory optical observations
  21. GRB 140311A: Zadko observatory - Gingin optical observations
  22. GRB140311B: Swift/XRT position
  23. GRB 140311B: Swift-XRT observations
  24. GRB 140311B: MASTER early optical observations
  25. GRB 140311A: MASTER early optical observations
  26. GRB 140311B: Swift detection of a burst
  27. GRB 140311A: Swift detection of a probable burst
  28. GRB 140304A: Suzaku WAM observation of the prompt emission
  29. IPN Triangulation of GRB 140308A
  30. IPN Triangulation of GRB 140306A
  31. GRB 140304A: Continued RATIR Optical and NIR Observations
  32. GRB 140305A: Swift-BAT refined analysis
  33. Trigger 590503: Swift-BAT triggered on noise
  34. GRB 140304A: CARMA 3mm detection
  35. GRB 140305A: Swift detection of a burst
  36. GRB 140304A: RATIR g-band Dropout
  37. GRB 140304A: Swift-BAT refined analysis
  38. GRB 140304A: Swift-XRT refined Analysis
  39. GRB 140304A: Enhanced Swift-XRT position
  40. GRB 140304A: Fermi GBM detection
  41. GRB 140304A: 10.4m GTC redshift z = 5.39
  42. GRB 140304A: Swift/UVOT Upper Limits
  43. GRB 140304A: Afterglow decay from Nanshan observations
  44. GRB 140304A: Swift detection of a burst
  45. GRB 140304A: MASTER OT detecton
  46. GRB 140301A: Swift/UVOT Upper Limits
  47. GRB 140302A: Swift/UVOT Upper Limits
  48. GRB140302A: Fermi GBM detection
  49. GRB 140302A: Swift-XRT refined Analysis
  50. GRB 140302A: Swift-BAT refined analysis
  51. GRB 140302A: Enhanced Swift-XRT position
  52. GRB 140301A: Swift-BAT refined analysis
  53. GRB 140301A: Swift-XRT refined Analysis
  54. GRB 140301A: GROND Detection of the Optical/NIR Afterglow
  55. GRB 140302A: GROND afterglow candidate
  56. GRB 140302A: Prompt enhanced Swift-XRT position
  57. GRB 140302A: Swift detection of a burst
  58. GRB 140301A: Enhanced Swift-XRT position
  59. GRB 140301A: Skynet R-COP Observations
  60. GRB 140301A: Swift detection of a burst
  61. GRB 140226A/iPTF14yb: Swift/UVOT Observations
  62. GRB 140226A / iPTF14yb: Swift-XRT confirms a fading X-ray source
  63. IPN triangulation of GRB 140226A, a possible GRB counterpart to iPTF14yb
  64. iPTF14yb: Swift-XRT detection
  65. GRB 140219A: Retraction of X-ray afterglow
  66. GRB 140102A: TAOS early optical afterglow detection
  67. GRB 140219A: XRT afterglow candidate
  68. GRB 140221A: Results from Swift XRT tiled observations
  69. GRB 140219A: Xuyi and Nanshan upper limits
  70. GRB 140219A: results from Swift XRT and UVOT tiled observations
  71. GRB 140221A Tiled Swift observations
  72. GRB 140219A Tiled Swift observations
  73. Swift follow-up of an Integral weak transient
  74. GRB 140213A: Continued Skynet R-COP/PROMPT Observations of the Optical Afterglow
  75. GRB 140215A: RAPTOR Observations During Gamma-Ray Emitting Interval
  76. GRB 140213A: Continued Skynet R-COP/PROMPT Detections of a Rebrightening Optical Afterglow
  77. GRB 140215A: Continued Skynet PROMPT Observations of the Optical Afterglow
  78. GRB 140211A: Khureltogot optical upper limits
  79. GRB 140215A: Continued RATIR Optical and NIR Observations
  80. Konus-Wind observation of GRB 140213A
  81. Konus-Wind observation of GRB 140215A
  82. GRB 140215A: Swift/UVOT Detection
  83. GRB 140211A: Swift-XRT and UVOT observations
  84. GRB140215A: Continued Discovery Channel Telescope Observations
  85. GRB 140215A: Swift-BAT refined analysis
  86. GRB 140215A: ISON-NM optical observations
  87. GRB 140215A: Swift-XRT refined Analysis
  88. GRB 140215A: P60 observations
  89. GRB 140215A: Enhanced Swift-XRT position
  90. GRB 140215A: RATIR Optical and NIR Observations
  91. GRB140215A: Skynet PROMPT Optical Observations
  92. GRB 140215A: KAIT Optical Detection
  93. GRB140215A: Prompt Observations with Discovery Channel Telescope
  94. GRB 140215A: Swift detection of a burst with optical counterpart
  95. GRB 140213A: Swift-BAT refined analysis
  96. GRB140206A: Discovery Channel Telescope Optical Detection
  97. GRB 140213A: Swift/UVOT Observations
  98. GRB 140213A: Fermi GBM Detection
  99. GRB 140213A: Swift-XRT refined Analysis
  100. GRB 140213A: Enhanced Swift-XRT position

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