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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"

19665 results found.

  1. GRB 150722A: Swift-BAT refined analysis
  2. GRB 150722A: Swift-XRT refined Analysis
  3. GRB 150722A: Swift/UVOT Upper Limits
  4. GRB 150720A: Swift/UVOT Upper Limits
  5. GRB 150722A: Enhanced Swift-XRT position
  6. GRB 150722A: Swift-XRT observations
  7. GRB 150722A: Swift detection of a burst
  8. GRB 150720A: Enhanced Swift-XRT position
  9. GRB 150720A: Swift-XRT refined Analysis
  10. GRB 150720A: Swift-BAT refined analysis
  11. Swift Trigger 649706: a possible GRB or bright Galactic transient
  12. GRB 150716A: KAIT Optical Upper Limit
  13. GRB 150716A: Swift-BAT refined analysis
  14. GRB 150716A: Swift/UVOT Upper Limits
  15. Swift trigger 649143 is not AX J1619.4-4945 or other astrophysical source
  16. GRB 150716A: Swift-XRT refined Analysis
  17. GRB 150716A: P60 Candidate Optical Afterglow
  18. GRB 150716A: RATIR Optical Observations
  19. GRB 150716A: Swift detection of a burst
  20. Trigger 649143: Swift detection of AX J1619.4-4945
  21. Trigger 649113: Swift detection of SGR 1E 1841-045
  22. GRB 150710B: Swift-XRT afterglow detection
  23. GRB 150711A: Swift-BAT refined analysis
  24. Konus-Wind observation of GRB 150710B
  25. GRB 150710B: Swift-XRT and Swift-UVOT observations
  26. GRB 150711A: Swift/UVOT Upper Limits
  27. GRB 150711A: Swift-XRT refined Analysis
  28. GRB 150711A: Fermi GBM detection
  29. GRB 150710B refined analysis
  30. GRB 150711A: Enhanced Swift-XRT position
  31. GRB 150711A: Swift detection of a burst
  32. GRB 150710B: Swift ToO observations
  33. GRB 150710B detected in ground analysis of BAT data
  34. GRB 150710A: Swift/UVOT Upper Limits
  35. GRB 150710A: host galaxy for Swift XRT second candidate
  36. Swift-XRT observations of GRB 150710A
  37. Confirmation that Swift trigger 648422 is not an astrophysical source
  38. Konus-Wind observation of GRB 150710A (Swift trigger 648437)
  39. GRB 150710A: Swift-BAT refined analysis
  40. GRB 150710A: RATIR Observations
  41. Swift trigger 648437: A GRB or a burst from 1RXS J125754.7+141850
  42. Swift Trigger 648422: Swift-XRT observations
  43. Trigger 648422: Swift possible detection of a source in NGC4552
  44. IPN Triangulation of GRB 150702A
  45. GRB 150702A: Swift-XRT observations
  46. GRB 150702A: Swift ToO observations
  47. GRB 150702A: Fermi-LAT detection
  48. GRB 150622A: Swift-XRT afterglow detection
  49. Swift Trigger 647642 is probably not an astrophysical source
  50. GRB 150626B, Swift-BAT refined analysis
  51. V404 Cyg activity (Swift, Fermi, INTGRAL, KONUS, MAXI detection): optical observations in TSHAO, Khureltogot, and AAO
  52. GRB 150627A: Swift/UVOT Detection
  53. GRB 150627A: Swift-XRT afterglow detection
  54. GRB 150626B: Swift-XRT refined Analysis
  55. GRB 150626A: Swift-BAT refined analysis
  56. GRB 150627A: Swift ToO observations
  57. GRB 150627A: Fermi-LAT detection
  58. GRB 150626B: Swift/UVOT Upper Limits
  59. GRB 150626B: Enhanced Swift-XRT position
  60. GRB 150626B: MASTER observations
  61. GRB 150626B: Swift detection of a burst
  62. GRB 150626A: Swift-XRT refined Analysis
  63. GRB 150626A: Swift/UVOT Upper Limits
  64. Trigger 646721: Swift detection of V 404 Cyg
  65. GRB 150626A: Enhanced Swift-XRT position
  66. GRB 150626A: Prompt enhanced Swift-XRT position
  67. GRB 150626A: Swift detection of a burst
  68. Swift Trigger 646423 is GS 1354-645
  69. Trigger 645944: Swift detection of H1745-203
  70. V404 Cyg: MASTER Swift, Integral alert observations
  71. GRB 150622A: Swift-XRT observations
  72. GRB 150622A: Tiled Swift observations
  73. Swift Trigger 645340 was Sco X-1
  74. Swift Trigger 645340: a possible GRB
  75. Trigger 645176: Swift detection of V404 Cyg
  76. Swift triggers again on V404 Cyg
  77. Swift Trigger 644596 is V404 Cyg
  78. Swift Trigger 644520 is V404 Cyg
  79. GRB 150616A: Swift/UVOT Upper Limits
  80. GRB 150616A: Swift-BAT refined analysis
  81. V404 Cyg outburst (Swift trigger 643949 ): TSHAO optical observations
  82. GRB 150616A: Swift-XRT refined Analysis
  83. Konus-Wind observation of Galactic transient V404 Cyg in outburst
  84. GRB 150616A: Enhanced Swift-XRT position
  85. GRB 150616A: Swift detection of a burst
  86. V404 Cyg: Swift/UVOT Detection
  87. Optical follow-up of Swift trigger on V404 Cyg
  88. GRB 150615A, Swift-BAT refined analysis
  89. Swift trigger 643949 is V404 Cyg
  90. GRB 150615A: Swift-XRT refined Analysis
  91. GRB 150608A: Swift-XRT follow-up observations
  92. GRB 150615A: Swift/UVOT Detection
  93. GRB 150615A: Enhanced Swift-XRT position
  94. GRB 150615A: Swift detection of a burst
  95. GRB 150608A: MITSuME Akeno optical upper limits
  96. Trigger 643078: Swift detection of H1743-322
  97. GRB 150608A: Swift-XRT afterglow detection
  98. GRB150607A: AAO and CrAO optical observations
  99. GRB150607A: Discovery Channel Telescope Optical Observations
  100. GRB 150608A: Tiled Swift observations

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