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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"

19352 results found.

  1. GRB 140402A BAT refined analysis
  2. GRB 140402A: Marginal BAT detection
  3. GRB 140402A: Fermi-LAT detection of a burst
  4. Swift trigger 594286: Is likely a noise trigger
  5. GRB 140331A: Swift-XRT refined Analysis
  6. GRB 140301A: Zadko observatory - Gingin optical observations
  7. GRB 140331A: Swift-BAT refined analysis
  8. GRB 140331A: Swift/UVOT Upper Limits
  9. GRB 140302A: TAROT La Silla observatory optical observations
  10. GRB 140323A: Zadko observatory - Gingin optical observations
  11. GRB 140331A: Zadko observatory - Gingin optical observations
  12. GRB 140129B: AAO optical upper limit
  13. GRB 140129A: Mondy optical observations
  14. GRB 140331A: Enhanced Swift-XRT position
  15. GRB 140331A: RATIR Optical and NIR Observations
  16. GRB 140331A: Swift detection of a burst
  17. GRB 140330A: Fermi-LAT Detection
  18. Swift trigger 593744: detection of a flare from UV Cet
  19. GRB 140323A : Suzaku WAM observation of the prompt emission
  20. Konus-Wind observation of GRB 140323A
  21. GRB 140323A: Fermi-LAT detection
  22. GRB 140323A: Swift-XRT refined Analysis
  23. GRB 140323A: Fermi GBM observation
  24. GRB 140323A: BOOTES-3 optical upper limit.
  25. GRB 140323A: Swift/UVOT Upper Limits
  26. GRB 140323A: Swift-BAT refined analysis
  27. GRB 140323A: Enhanced Swift-XRT position
  28. GRB 140323A: Swift detection of a burst
  29. GRB 140320A: RATIR Optical and NIR Observations
  30. IPN Triangulation of very intense GRB 140320D
  31. GRB 140320C: Swift/UVOT Upper Limits
  32. GRB 140320A: Swift-BAT refined analysis
  33. GRB 140320B: Swift/UVOT Upper Limits
  34. GRB 140320A: Swift/UVOT Upper Limits
  35. GRB 140320C: Swift-XRT observations
  36. GRB 140320A: Confirmation of a fading X-ray afterglow
  37. GRB 140320C: Swift-XRT detection of the X-ray afterglow
  38. GRB 140320A: Fermi GBM detection
  39. GRB 140320B: Swift-XRT detection of the afterglow
  40. GRB 140320A: Enhanced Swift-XRT position
  41. GRB 140320A: Swift-XRT detection of an afterglow candidate
  42. Swift Trigger 592558 is not an astrophysical source
  43. GRB 140320A: Fermi GBM observations suggest a short GRB
  44. GRB 140320A: Swift detection of a burst
  45. GRB 140318A: Mondy optical limit
  46. GRB 140318A: Swift/UVOT Upper Limits
  47. GRB 140318A: Swift-BAT refined analysis
  48. GRB 140311B: Mondy optical limit
  49. GRB 140311A: Mondy optical limits
  50. GRB 140318A: Swift-XRT refined Analysis
  51. GRB 140318A: Liverpool Telescope optical observations
  52. GRB 140318A: Enhanced Swift-XRT position
  53. GRB140318A: Discovery Channel Telescope Optical Detection
  54. GRB 140318A: Swift detection of a burst
  55. GRB140308A: Suzaku WAM observation of the prompt emission
  56. GRB 140311C: Swift-XRT and UVOT observations
  57. GRB 140311B: Swift-BAT refined analysis
  58. GRB 140311A: RATIR Optical and NIR Detection
  59. GRB 140311A: Montarrenti Observatory optical upper limit
  60. GRB 140311B: Fermi GBM Detection
  61. GRB 140311A: Swift/UVOT Upper Limits
  62. GRB 140311B: Swift/UVOT Upper Limits
  63. Fermi416242156: possible iPTF counterpart
  64. GRB 140311B: RATIR Optical and NIR Observations
  65. GRB 140311A: Bassano Bresciano Observatory optical upper limit
  66. GRB 140311A: Swift-XRT refined Analysis
  67. GRO J1744-28: Fermi GBM observation
  68. GRB 140302A: GROND confirmation of the afterglow
  69. GRB 140311B: Swift-XRT refined Analysis
  70. GRB 140311A: Swift-BAT refined analysis
  71. GRB 140311A: Enhanced Swift-XRT position
  72. GRB 140311B: Enhanced Swift-XRT position
  73. GRB 140311B: TAROT Calern observatory optical observations
  74. GRB 140311A: Zadko observatory - Gingin optical observations
  75. GRB140311B: Swift/XRT position
  76. GRB 140311B: Swift-XRT observations
  77. GRB 140311B: MASTER early optical observations
  78. GRB 140311A: MASTER early optical observations
  79. GRB 140311B: Swift detection of a burst
  80. GRB 140311A: Swift detection of a probable burst
  81. GRB 140304A: Suzaku WAM observation of the prompt emission
  82. IPN Triangulation of GRB 140308A
  83. IPN Triangulation of GRB 140306A
  84. GRB 140304A: Continued RATIR Optical and NIR Observations
  85. GRB 140305A: Swift-BAT refined analysis
  86. Trigger 590503: Swift-BAT triggered on noise
  87. GRB 140304A: CARMA 3mm detection
  88. GRB 140305A: Swift detection of a burst
  89. GRB 140304A: RATIR g-band Dropout
  90. GRB 140304A: Swift-BAT refined analysis
  91. GRB 140304A: Swift-XRT refined Analysis
  92. GRB 140304A: Enhanced Swift-XRT position
  93. GRB 140304A: Fermi GBM detection
  94. GRB 140304A: 10.4m GTC redshift z = 5.39
  95. GRB 140304A: Swift/UVOT Upper Limits
  96. GRB 140304A: Afterglow decay from Nanshan observations
  97. GRB 140304A: Swift detection of a burst
  98. GRB 140304A: MASTER OT detecton
  99. GRB 140301A: Swift/UVOT Upper Limits
  100. GRB 140302A: Swift/UVOT Upper Limits

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