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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"

19670 results found.

  1. Swift Trigger 595616: a possible GRB
  2. GRB 140412A: Swift detection of a burst
  3. GRB 140408A: 1.5m OSN optical upper limit
  4. Swift Trigger 595345 is not an astrophysical source
  5. Swift-BAT trigger 595162 is noise
  6. GRB 140408A: RATIR Optical Upper Limits
  7. GRB 140408A: Swift-BAT refined analysis
  8. GRB 140408A: GROND Detection of an Afterglow Candidate
  9. GRB 140408A: Swift/UVOT Upper Limits
  10. GRB 140408A: Swift-XRT refined Analysis
  11. GRB 140408A: Enhanced Swift-XRT position
  12. GRB 140408A: Fermi GBM detection
  13. Swift Trigger 595162: a possible GRB
  14. GRB 140408A: Swift detection of a burst
  15. GRB 140402A: Deep limit on the optical afterglow from Magellan observations
  16. GRB 140402A: Swift/UVOT Upper Limits
  17. GRB 140331A: Continued RATIR Optical and NIR Observations
  18. GRB 140402A: Swift-XRT observations
  19. GRB 140402A: MASTER optical observations
  20. GRB 140402A BAT refined analysis
  21. GRB 140402A: Marginal BAT detection
  22. GRB 140402A: Fermi-LAT detection of a burst
  23. Swift trigger 594286: Is likely a noise trigger
  24. GRB 140331A: Swift-XRT refined Analysis
  25. GRB 140301A: Zadko observatory - Gingin optical observations
  26. GRB 140331A: Swift-BAT refined analysis
  27. GRB 140331A: Swift/UVOT Upper Limits
  28. GRB 140302A: TAROT La Silla observatory optical observations
  29. GRB 140323A: Zadko observatory - Gingin optical observations
  30. GRB 140331A: Zadko observatory - Gingin optical observations
  31. GRB 140129B: AAO optical upper limit
  32. GRB 140129A: Mondy optical observations
  33. GRB 140331A: Enhanced Swift-XRT position
  34. GRB 140331A: RATIR Optical and NIR Observations
  35. GRB 140331A: Swift detection of a burst
  36. GRB 140330A: Fermi-LAT Detection
  37. Swift trigger 593744: detection of a flare from UV Cet
  38. GRB 140323A : Suzaku WAM observation of the prompt emission
  39. Konus-Wind observation of GRB 140323A
  40. GRB 140323A: Fermi-LAT detection
  41. GRB 140323A: Swift-XRT refined Analysis
  42. GRB 140323A: Fermi GBM observation
  43. GRB 140323A: BOOTES-3 optical upper limit.
  44. GRB 140323A: Swift/UVOT Upper Limits
  45. GRB 140323A: Swift-BAT refined analysis
  46. GRB 140323A: Enhanced Swift-XRT position
  47. GRB 140323A: Swift detection of a burst
  48. GRB 140320A: RATIR Optical and NIR Observations
  49. IPN Triangulation of very intense GRB 140320D
  50. GRB 140320C: Swift/UVOT Upper Limits
  51. GRB 140320A: Swift-BAT refined analysis
  52. GRB 140320B: Swift/UVOT Upper Limits
  53. GRB 140320A: Swift/UVOT Upper Limits
  54. GRB 140320C: Swift-XRT observations
  55. GRB 140320A: Confirmation of a fading X-ray afterglow
  56. GRB 140320C: Swift-XRT detection of the X-ray afterglow
  57. GRB 140320A: Fermi GBM detection
  58. GRB 140320B: Swift-XRT detection of the afterglow
  59. GRB 140320A: Enhanced Swift-XRT position
  60. GRB 140320A: Swift-XRT detection of an afterglow candidate
  61. Swift Trigger 592558 is not an astrophysical source
  62. GRB 140320A: Fermi GBM observations suggest a short GRB
  63. GRB 140320A: Swift detection of a burst
  64. GRB 140318A: Mondy optical limit
  65. GRB 140318A: Swift/UVOT Upper Limits
  66. GRB 140318A: Swift-BAT refined analysis
  67. GRB 140311B: Mondy optical limit
  68. GRB 140311A: Mondy optical limits
  69. GRB 140318A: Swift-XRT refined Analysis
  70. GRB 140318A: Liverpool Telescope optical observations
  71. GRB 140318A: Enhanced Swift-XRT position
  72. GRB140318A: Discovery Channel Telescope Optical Detection
  73. GRB 140318A: Swift detection of a burst
  74. GRB140308A: Suzaku WAM observation of the prompt emission
  75. GRB 140311C: Swift-XRT and UVOT observations
  76. GRB 140311B: Swift-BAT refined analysis
  77. GRB 140311A: RATIR Optical and NIR Detection
  78. GRB 140311A: Montarrenti Observatory optical upper limit
  79. GRB 140311B: Fermi GBM Detection
  80. GRB 140311A: Swift/UVOT Upper Limits
  81. GRB 140311B: Swift/UVOT Upper Limits
  82. Fermi416242156: possible iPTF counterpart
  83. GRB 140311B: RATIR Optical and NIR Observations
  84. GRB 140311A: Bassano Bresciano Observatory optical upper limit
  85. GRB 140311A: Swift-XRT refined Analysis
  86. GRO J1744-28: Fermi GBM observation
  87. GRB 140302A: GROND confirmation of the afterglow
  88. GRB 140311B: Swift-XRT refined Analysis
  89. GRB 140311A: Swift-BAT refined analysis
  90. GRB 140311A: Enhanced Swift-XRT position
  91. GRB 140311B: Enhanced Swift-XRT position
  92. GRB 140311B: TAROT Calern observatory optical observations
  93. GRB 140311A: Zadko observatory - Gingin optical observations
  94. GRB140311B: Swift/XRT position
  95. GRB 140311B: Swift-XRT observations
  96. GRB 140311B: MASTER early optical observations
  97. GRB 140311A: MASTER early optical observations
  98. GRB 140311B: Swift detection of a burst
  99. GRB 140311A: Swift detection of a probable burst
  100. GRB 140304A: Suzaku WAM observation of the prompt emission

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