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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"

37565 results found.

  1. GRB 150710B detected in ground analysis of BAT data
  2. GRB 150710A: Swift/UVOT Upper Limits
  3. MASTER OT Detection during Fermi Trigger 458235025 inspection
  4. GRB 150710A: host galaxy for Swift XRT second candidate
  5. Swift-XRT observations of GRB 150710A
  6. Confirmation that Swift trigger 648422 is not an astrophysical source
  7. Konus-Wind observation of GRB 150710A (Swift trigger 648437)
  8. GRB 150710A: Swift-BAT refined analysis
  9. GRB 150710A: RATIR Observations
  10. Swift trigger 648437: A GRB or a burst from 1RXS J125754.7+141850
  11. GRB 150626B: AMI 16 GHz detection of the radio counterpart
  12. Fermi Gamma-ray Burst Monitor Trigger bn150705731 is not a GRB
  13. Konus-Wind observation of GRB 150702A
  14. GRB 150702A: Fermi GBM detection
  15. IPN Triangulation of GRB 150702A
  16. GRB 150702A: MASTER-SAAO inspection
  17. GRB 150702A: Swift-XRT observations
  18. GRB 150702A: Swift ToO observations
  19. GRB 150702A: Fermi-LAT detection
  20. Fermi GBM Observations is no longer triggerin on V404 Cyg
  21. GRB 150622A: Swift-XRT afterglow detection
  22. Fermi Gamma-ray Burst Monitor Trigger 150626873 is not a GRB
  23. Fermi Gamma-ray Burst Monitor Trigger bn150628857 is not a GRB
  24. Fermi Gamma-ray Burst Monitor trigger bn150629779 is not a GRB
  25. Konus-Wind observation of GRB 150627A
  26. GRB 150626B, Swift-BAT refined analysis
  27. V404 Cyg activity (Swift, Fermi, INTGRAL, KONUS, MAXI detection): optical observations in TSHAO, Khureltogot, and AAO
  28. GRB 150627A: corection to 17978
  29. GRB 150627A: MASTER-SAAO OT Detection
  30. GRB 150627A: Swift/UVOT Detection
  31. GRB 150627A: Swift-XRT afterglow detection
  32. GRB 150627A: Fermi GBM observation
  33. GRB 150626B: Swift-XRT refined Analysis
  34. GRB 150626A: Swift-BAT refined analysis
  35. GRB 150627A: Swift ToO observations
  36. GRB 150627A: Fermi-LAT detection
  37. GRB 150626B: Swift/UVOT Upper Limits
  38. GRB 150626B: NOT optical upper limits
  39. GRB 150626B: Enhanced Swift-XRT position
  40. GRB 150626B: MASTER observations
  41. GRB 150626B: Swift detection of a burst
  42. GRB 150626A: Swift-XRT refined Analysis
  43. GRB 150626A: Swift/UVOT Upper Limits
  44. GRB 150626A: Enhanced Swift-XRT position
  45. GRB 150626A: Prompt enhanced Swift-XRT position
  46. GRB 150626A: Swift detection of a burst
  47. Fermi Gamma-ray Burst Monitor triggers that are not GRBs
  48. Fermi Gamma-ray Burst Monitor triggers bn150622899 and bn150623043 are not GRBs
  49. GRB 150622A: Swift-XRT observations
  50. GRB 150622A: Tiled Swift observations
  51. GRB 150622A: MAXI/GSC detection
  52. Swift Trigger 645340: a possible GRB
  53. V404 Cyg: Fermi GBM observations
  54. GRB 150616A: Watcher optical upper limit
  55. IBAS trigger 7015 is not a GRB
  56. GRB 150616A: Swift/UVOT Upper Limits
  57. GRB 150616A: Swift-BAT refined analysis
  58. V404 Cyg outburst (Swift trigger 643949 ): TSHAO optical observations
  59. GRB 150616A: Swift-XRT refined Analysis
  60. Konus-Wind observation of Galactic transient V404 Cyg in outburst
  61. GRB 150616A: Enhanced Swift-XRT position
  62. GRB 150616A: Swift detection of a burst
  63. Fermi GBM trigger 150616734 is not a GRB
  64. Fermi GBM trigger 150616594 is not a GRB
  65. Fermi Gamma-ray Burst Monitor triggers bn150615791 and bn150615798 are not GRBs
  66. Optical follow-up of Swift trigger on V404 Cyg
  67. GRB 150615A, Swift-BAT refined analysis
  68. GRB 150615A: Swift-XRT refined Analysis
  69. Fermi GBM trigger 150615574 is not a GRB
  70. GRB 150608A: Swift-XRT follow-up observations
  71. GRB 150615A: Swift/UVOT Detection
  72. GRB 150615A: Enhanced Swift-XRT position
  73. GRB 150615A: Swift detection of a burst
  74. Fermi GBM trigger 150613619 is not a GRB
  75. Fermi GBM trigger 150612648 is not a GRB
  76. GRB 150608A: MITSuME Akeno optical upper limits
  77. Konus-Wind observation of GRB 150608A
  78. GRB 150608A: Swift-XRT afterglow detection
  79. Fermi Gamma-ray Burst Monitor trigger 455474712 / 150608698 is not a GRB
  80. GRB150607A: AAO and CrAO optical observations
  81. GRB150607A: Discovery Channel Telescope Optical Observations
  82. GRB 150608A: Tiled Swift observations
  83. GRB 150608A: MAXI/GSC detection
  84. Konus-Wind observation of GRB 150607A
  85. GRB 150607A: Swift-XRT refined Analysis
  86. GRB 150607A: Swift/UVOT Detection
  87. GRB 150607A: NOT optical observations
  88. GRB 150607A: Swift-BAT refined analysis
  89. GRB 150607A: Fermi GBM Detection
  90. GRB 150607A: Enhanced Swift-XRT position
  91. GRB 150607A: Swift detection of a burst with an optical counterpart
  92. GRB 150518A: possible SN observations
  93. Swift trigger 642453 is not an astrophysical source
  94. Swift Trigger 642453: a possible GRB
  95. Konus-Wind observation of GRB 150530A
  96. GRB 150530B: Swift-XRT observations
  97. GRB 150527A: Continued RATIR Observations
  98. GRB 150530B: Swift ToO observations
  99. GRB 150530B detected in ground analysis of BAT data
  100. GRB 150530A: RATIR Optical Observations

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