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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

19663 results found.

  1. GRB 140408A: RATIR Optical Upper Limits
  2. GRB 140408A: Swift-BAT refined analysis
  3. GRB 140408A: GROND Detection of an Afterglow Candidate
  4. GRB 140408A: Swift/UVOT Upper Limits
  5. GRB 140408A: Swift-XRT refined Analysis
  6. GRB 140408A: Enhanced Swift-XRT position
  7. GRB 140408A: Fermi GBM detection
  8. Swift Trigger 595162: a possible GRB
  9. GRB 140408A: Swift detection of a burst
  10. GRB 140402A: Deep limit on the optical afterglow from Magellan observations
  11. GRB 140402A: Swift/UVOT Upper Limits
  12. GRB 140331A: Continued RATIR Optical and NIR Observations
  13. GRB 140402A: Swift-XRT observations
  14. GRB 140402A: MASTER optical observations
  15. GRB 140402A BAT refined analysis
  16. GRB 140402A: Marginal BAT detection
  17. GRB 140402A: Fermi-LAT detection of a burst
  18. Swift trigger 594286: Is likely a noise trigger
  19. GRB 140331A: Swift-XRT refined Analysis
  20. GRB 140301A: Zadko observatory - Gingin optical observations
  21. GRB 140331A: Swift-BAT refined analysis
  22. GRB 140331A: Swift/UVOT Upper Limits
  23. GRB 140302A: TAROT La Silla observatory optical observations
  24. GRB 140323A: Zadko observatory - Gingin optical observations
  25. GRB 140331A: Zadko observatory - Gingin optical observations
  26. GRB 140129B: AAO optical upper limit
  27. GRB 140129A: Mondy optical observations
  28. GRB 140331A: Enhanced Swift-XRT position
  29. GRB 140331A: RATIR Optical and NIR Observations
  30. GRB 140331A: Swift detection of a burst
  31. GRB 140330A: Fermi-LAT Detection
  32. Swift trigger 593744: detection of a flare from UV Cet
  33. GRB 140323A : Suzaku WAM observation of the prompt emission
  34. Konus-Wind observation of GRB 140323A
  35. GRB 140323A: Fermi-LAT detection
  36. GRB 140323A: Swift-XRT refined Analysis
  37. GRB 140323A: Fermi GBM observation
  38. GRB 140323A: BOOTES-3 optical upper limit.
  39. GRB 140323A: Swift/UVOT Upper Limits
  40. GRB 140323A: Swift-BAT refined analysis
  41. GRB 140323A: Enhanced Swift-XRT position
  42. GRB 140323A: Swift detection of a burst
  43. GRB 140320A: RATIR Optical and NIR Observations
  44. IPN Triangulation of very intense GRB 140320D
  45. GRB 140320C: Swift/UVOT Upper Limits
  46. GRB 140320A: Swift-BAT refined analysis
  47. GRB 140320B: Swift/UVOT Upper Limits
  48. GRB 140320A: Swift/UVOT Upper Limits
  49. GRB 140320C: Swift-XRT observations
  50. GRB 140320A: Confirmation of a fading X-ray afterglow
  51. GRB 140320C: Swift-XRT detection of the X-ray afterglow
  52. GRB 140320A: Fermi GBM detection
  53. GRB 140320B: Swift-XRT detection of the afterglow
  54. GRB 140320A: Enhanced Swift-XRT position
  55. GRB 140320A: Swift-XRT detection of an afterglow candidate
  56. Swift Trigger 592558 is not an astrophysical source
  57. GRB 140320A: Fermi GBM observations suggest a short GRB
  58. GRB 140320A: Swift detection of a burst
  59. GRB 140318A: Mondy optical limit
  60. GRB 140318A: Swift/UVOT Upper Limits
  61. GRB 140318A: Swift-BAT refined analysis
  62. GRB 140311B: Mondy optical limit
  63. GRB 140311A: Mondy optical limits
  64. GRB 140318A: Swift-XRT refined Analysis
  65. GRB 140318A: Liverpool Telescope optical observations
  66. GRB 140318A: Enhanced Swift-XRT position
  67. GRB140318A: Discovery Channel Telescope Optical Detection
  68. GRB 140318A: Swift detection of a burst
  69. GRB140308A: Suzaku WAM observation of the prompt emission
  70. GRB 140311C: Swift-XRT and UVOT observations
  71. GRB 140311B: Swift-BAT refined analysis
  72. GRB 140311A: RATIR Optical and NIR Detection
  73. GRB 140311A: Montarrenti Observatory optical upper limit
  74. GRB 140311B: Fermi GBM Detection
  75. GRB 140311A: Swift/UVOT Upper Limits
  76. GRB 140311B: Swift/UVOT Upper Limits
  77. Fermi416242156: possible iPTF counterpart
  78. GRB 140311B: RATIR Optical and NIR Observations
  79. GRB 140311A: Bassano Bresciano Observatory optical upper limit
  80. GRB 140311A: Swift-XRT refined Analysis
  81. GRO J1744-28: Fermi GBM observation
  82. GRB 140302A: GROND confirmation of the afterglow
  83. GRB 140311B: Swift-XRT refined Analysis
  84. GRB 140311A: Swift-BAT refined analysis
  85. GRB 140311A: Enhanced Swift-XRT position
  86. GRB 140311B: Enhanced Swift-XRT position
  87. GRB 140311B: TAROT Calern observatory optical observations
  88. GRB 140311A: Zadko observatory - Gingin optical observations
  89. GRB140311B: Swift/XRT position
  90. GRB 140311B: Swift-XRT observations
  91. GRB 140311B: MASTER early optical observations
  92. GRB 140311A: MASTER early optical observations
  93. GRB 140311B: Swift detection of a burst
  94. GRB 140311A: Swift detection of a probable burst
  95. GRB 140304A: Suzaku WAM observation of the prompt emission
  96. IPN Triangulation of GRB 140308A
  97. IPN Triangulation of GRB 140306A
  98. GRB 140304A: Continued RATIR Optical and NIR Observations
  99. GRB 140305A: Swift-BAT refined analysis
  100. Trigger 590503: Swift-BAT triggered on noise

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