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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"

28119 results found.

  1. GRB 140818A: Swift-XRT and UVOT potential afterglow detection
  2. GRB 140818A: MAXI/GSC detection
  3. GRB 140817A: Swift-XRT refined Analysis
  4. GRB 140817A: Swift-BAT refined analysis
  5. GRB 140817A: Enhanced Swift-XRT position
  6. GRB 140817A: Swift detection of a burst
  7. GRB 140815A: GROND afterglow candidate
  8. Swift Trigger 609694 is probably not an astrophysical source
  9. GRB 140815A: Swift-XRT observations
  10. GRB 140815A: A long GRB detected by INTEGRAL
  11. GRB 140814A: Swift-XRT and UVOT observations
  12. GRB 140814A: MASTER optical follow-up inspection
  13. GRB 140814A: Swift-XRT and UVOT observations
  14. GRB 140814A: MAXI/GSC detection
  15. GRB 140808A: Confirmation of the Swift-XRT afterglow
  16. GRB140810A: Fermi-LAT detection
  17. Swift trigger 609139 is probably 4U 1850-03
  18. Swift observations of possible GRB 140809A candidate
  19. GRB 140809A : Virtual Telescope optical observations
  20. GRB 140808A: Swift/UVOT Upper Limits
  21. GRB 140808A: Swift-XRT observations
  22. GRB 140808A: optical afterglow candidate iPTF14eag
  23. GRB 140801A: AAO optical observations
  24. GRB 140801A: GROND Afterglow detection, unbroken decay
  25. GRB140801A: Swift/XRT further observations
  26. GRB 140730A: GROND Upper limits
  27. GRB 140801A: BTA confirmation of redshift
  28. GRB 140801A: Swift/UVOT Upper Limits
  29. GRB 140801A: Swift-XRT observations
  30. GRB 140801A : Virtual Telescope optical observations
  31. GRB 140801A: Fermi GBM observation
  32. GRB 140801A: NOT afterglow confirmation
  33. GRB 140730A, Swift-BAT refined analysis
  34. GRB 140709B: TShAO optical upper limit
  35. GRB 140709A, the review of the sky area in plate archives
  36. Swift Trigger 607945: possible noise event in the direction of NGC2559
  37. GRB 140730A: LCO-Sutherland observations
  38. GRB 140730A: Swift-XRT refined Analysis
  39. GRB 140730A: Swift/UVOT Upper Limits
  40. GRB 140730A: Enhanced Swift-XRT position
  41. GRB 140730A: Swift detection of a burst
  42. GRB 140729A: iPTF optical upper limit
  43. Swift Trigger 607506 is probably noise
  44. GRB 140729A: Swift-XRT and UVOT observations
  45. IPN Triangulation of GRB 140729A
  46. GRB 140729A: Fermi-GBM detection
  47. Correction to Fermi-LAT GCN Circular 16633
  48. GRB 140729A: Fermi-LAT detection
  49. Trigger 607399: Swift detection of SGR1806-20
  50. GRB 140723A: Swift-XRT and UVOT observations
  51. GRB 140723A: LCO-Sutherland optical candidate retraction
  52. GRB 140723A: MASTER optical observation
  53. Konus-Wind observation of GRB 140723A
  54. GRB 140723A: LCO-Sutherland optical candidate
  55. GRB 140723A: Fermi GBM detection
  56. IPN Triangulation of GRB 140723A
  57. GRB 140723A Tiled Swift observations
  58. GRB 140723A: Fermi-LAT detection
  59. GRB 140709B: Swift/UVOT Upper Limits
  60. GRB 140719B: Swift XRT observation
  61. GRB 140719A: Swift/UVOT Upper Limits
  62. GRB 140721A: Fermi GBM detection
  63. GRB 140716A: Confirmation of the Swift-XRT afterglow
  64. GRB 140719B, Swift-BAT refined analysis
  65. GRB 140716A: GROND confirmation of the afterglow
  66. GRB 140719A, Swift-BAT refined analysis
  67. GRB 140719A: GROND Afterglow candidate
  68. GRB 140719B: Zadko observatory - Gingin optical observations
  69. GRB 140719A: Swift-XRT refined Analysis
  70. GRB 140719A: Enhanced Swift-XRT position
  71. GRB 140719A: Swift detection of a burst
  72. Konus-Wind observation of GRB 140716A
  73. GRB 140716A: Swift/UVOT Upper Limits
  74. GRB 140713A: AMI 15 GHz detection
  75. GRB 140713A: 10.4-m GTC deep optical observation
  76. GRB 140716A: GROND afterglow candidate
  77. GRB 140716A: Swift-XRT detection of an afterglow candidate
  78. GRB 140716A BAT refined analysis
  79. Swift observations of a flare from UX Ari
  80. GRB 140709A: Possible AMI 15 GHz detection
  81. Swift detection of UX Ari
  82. GRB 140714A: Fermi GBM detection
  83. GRB 140713A: Swift-XRT refined Analysis
  84. GRB 140713A: Swift/UVOT Upper Limits
  85. GRB 140713A: NOT upper limits
  86. GRB 140713A: Enhanced Swift-XRT position
  87. GRB 140713A: Swift-BAT refined analysis
  88. GRB 140713A: T100 observations
  89. GRB 140710A: iTelescope.Net T11 Optical Observation
  90. GRB 140713A: Swift detection of a burst
  91. Swift Trigger 604111 is not a GRB
  92. GRB 140710B: Fermi GBM detection
  93. Fermi GBM Observations of SGR 1935+2154
  94. GRB 140710B: a long GRB detected with INTEGRAL
  95. GRB 140709A: Continued RATIR Optical and NIR Observations
  96. GRB 140710A: Swift-XRT refined Analysis
  97. GRB 140710A: Swift-BAT refined analysis
  98. GRB 140710A: Swift/UVOT Upper Limits
  99. GRB 140709B: update of Khureltogot optical upper limit
  100. GRB 140710A: Enhanced Swift-XRT position

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