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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"

37576 results found.

  1. GRB 150711A: Swift-BAT refined analysis
  2. Konus-Wind observation of GRB 150710B
  3. GRB 150710B: Swift-XRT and Swift-UVOT observations
  4. GRB 150711A: Swift/UVOT Upper Limits
  5. GRB 150711A: Swift-XRT refined Analysis
  6. GRB 150711A: Fermi GBM detection
  7. GRB 150711A: Observations from the 2.5m NOT
  8. GRB 150710B refined analysis
  9. GRB 150711A: Enhanced Swift-XRT position
  10. GRB 150711A: Swift detection of a burst
  11. GRB 150710B: Swift ToO observations
  12. GRB 150710B detected in ground analysis of BAT data
  13. GRB 150710A: Swift/UVOT Upper Limits
  14. MASTER OT Detection during Fermi Trigger 458235025 inspection
  15. GRB 150710A: host galaxy for Swift XRT second candidate
  16. Swift-XRT observations of GRB 150710A
  17. Confirmation that Swift trigger 648422 is not an astrophysical source
  18. Konus-Wind observation of GRB 150710A (Swift trigger 648437)
  19. GRB 150710A: Swift-BAT refined analysis
  20. GRB 150710A: RATIR Observations
  21. Swift trigger 648437: A GRB or a burst from 1RXS J125754.7+141850
  22. GRB 150626B: AMI 16 GHz detection of the radio counterpart
  23. Fermi Gamma-ray Burst Monitor Trigger bn150705731 is not a GRB
  24. Konus-Wind observation of GRB 150702A
  25. GRB 150702A: Fermi GBM detection
  26. IPN Triangulation of GRB 150702A
  27. GRB 150702A: MASTER-SAAO inspection
  28. GRB 150702A: Swift-XRT observations
  29. GRB 150702A: Swift ToO observations
  30. GRB 150702A: Fermi-LAT detection
  31. Fermi GBM Observations is no longer triggerin on V404 Cyg
  32. GRB 150622A: Swift-XRT afterglow detection
  33. Fermi Gamma-ray Burst Monitor Trigger 150626873 is not a GRB
  34. Fermi Gamma-ray Burst Monitor Trigger bn150628857 is not a GRB
  35. Fermi Gamma-ray Burst Monitor trigger bn150629779 is not a GRB
  36. Konus-Wind observation of GRB 150627A
  37. GRB 150626B, Swift-BAT refined analysis
  38. V404 Cyg activity (Swift, Fermi, INTGRAL, KONUS, MAXI detection): optical observations in TSHAO, Khureltogot, and AAO
  39. GRB 150627A: corection to 17978
  40. GRB 150627A: MASTER-SAAO OT Detection
  41. GRB 150627A: Swift/UVOT Detection
  42. GRB 150627A: Swift-XRT afterglow detection
  43. GRB 150627A: Fermi GBM observation
  44. GRB 150626B: Swift-XRT refined Analysis
  45. GRB 150626A: Swift-BAT refined analysis
  46. GRB 150627A: Swift ToO observations
  47. GRB 150627A: Fermi-LAT detection
  48. GRB 150626B: Swift/UVOT Upper Limits
  49. GRB 150626B: NOT optical upper limits
  50. GRB 150626B: Enhanced Swift-XRT position
  51. GRB 150626B: MASTER observations
  52. GRB 150626B: Swift detection of a burst
  53. GRB 150626A: Swift-XRT refined Analysis
  54. GRB 150626A: Swift/UVOT Upper Limits
  55. GRB 150626A: Enhanced Swift-XRT position
  56. GRB 150626A: Prompt enhanced Swift-XRT position
  57. GRB 150626A: Swift detection of a burst
  58. Fermi Gamma-ray Burst Monitor triggers that are not GRBs
  59. Fermi Gamma-ray Burst Monitor triggers bn150622899 and bn150623043 are not GRBs
  60. GRB 150622A: Swift-XRT observations
  61. GRB 150622A: Tiled Swift observations
  62. GRB 150622A: MAXI/GSC detection
  63. Swift Trigger 645340: a possible GRB
  64. V404 Cyg: Fermi GBM observations
  65. GRB 150616A: Watcher optical upper limit
  66. IBAS trigger 7015 is not a GRB
  67. GRB 150616A: Swift/UVOT Upper Limits
  68. GRB 150616A: Swift-BAT refined analysis
  69. V404 Cyg outburst (Swift trigger 643949 ): TSHAO optical observations
  70. GRB 150616A: Swift-XRT refined Analysis
  71. Konus-Wind observation of Galactic transient V404 Cyg in outburst
  72. GRB 150616A: Enhanced Swift-XRT position
  73. GRB 150616A: Swift detection of a burst
  74. Fermi GBM trigger 150616734 is not a GRB
  75. Fermi GBM trigger 150616594 is not a GRB
  76. Fermi Gamma-ray Burst Monitor triggers bn150615791 and bn150615798 are not GRBs
  77. Optical follow-up of Swift trigger on V404 Cyg
  78. GRB 150615A, Swift-BAT refined analysis
  79. GRB 150615A: Swift-XRT refined Analysis
  80. Fermi GBM trigger 150615574 is not a GRB
  81. GRB 150608A: Swift-XRT follow-up observations
  82. GRB 150615A: Swift/UVOT Detection
  83. GRB 150615A: Enhanced Swift-XRT position
  84. GRB 150615A: Swift detection of a burst
  85. Fermi GBM trigger 150613619 is not a GRB
  86. Fermi GBM trigger 150612648 is not a GRB
  87. GRB 150608A: MITSuME Akeno optical upper limits
  88. Konus-Wind observation of GRB 150608A
  89. GRB 150608A: Swift-XRT afterglow detection
  90. Fermi Gamma-ray Burst Monitor trigger 455474712 / 150608698 is not a GRB
  91. GRB150607A: AAO and CrAO optical observations
  92. GRB150607A: Discovery Channel Telescope Optical Observations
  93. GRB 150608A: Tiled Swift observations
  94. GRB 150608A: MAXI/GSC detection
  95. Konus-Wind observation of GRB 150607A
  96. GRB 150607A: Swift-XRT refined Analysis
  97. GRB 150607A: Swift/UVOT Detection
  98. GRB 150607A: NOT optical observations
  99. GRB 150607A: Swift-BAT refined analysis
  100. GRB 150607A: Fermi GBM Detection

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