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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"

27295 results found.

  1. GRB 181020A: Fermi-LAT detection
  2. GRB 181020A: Swift detection of a burst with an optical counterpart
  3. FRB 181016: MASTER optical inspection of the Fast Radio Burst error box
  4. GRB 181014A: Insight-HXMT/HE detection
  5. Fermi GBM Observation of IceCube-181014A
  6. Trigger 867343: Swift detection of SGR1806-20
  7. GRB 181016A: Swift-BAT refined analysis
  8. GRB 181016A: Swift detection of a burst
  9. Trigger 866993: Swift detection of SGR1806-20
  10. GRB 181013A: Swift/UVOT Upper Limits
  11. GRB 181013A: Swift-BAT refined analysis
  12. GRB 181013A: Global MASTER Net optical observations
  13. GRB 181013A: Swift detection of a probable burst
  14. Swift Trigger 866757: is probably not a GRB
  15. GRB 181011A: Global MASTER Net optical inspection
  16. GRB 181011A: CALET Gamma-Ray Burst Monitor detection
  17. GROND afterglow detection of GRB 181010A
  18. GRB180913A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 558557292)
  19. GRB 181008B: Global MASTER Net optical inspection
  20. GRB 181010A: Swift-BAT refined analysis
  21. GRB 181010A: Fermi GBM observation
  22. IPN Triangulation of GRB 181008B (long)
  23. GRB 181010A: Swift/UVOT Detection
  24. GRB 181010A: Swift-XRT refined Analysis
  25. GRB 181008A: Insight-HXMT/HE detection
  26. GRB 181010A: RATIR Optical and NIR Afterglow Detection
  27. GRB 181010A: LCO Cerro Tololo observations
  28. GRB 181010A: MASTER-Argentina OT detection
  29. GRB 181010A: Swift detection of a burst with an optical counterpart
  30. GRB 181003A: RATIR Optical and NIR Observations
  31. GRB 181003A: Swift-BAT refined analysis
  32. GRB 181003A: Swift/UVOT Upper Limits
  33. GRB 181002A: Swift-XRT refined Analysis
  34. GRB 181003A: LCO Cerro Tololo observations
  35. GRB 181003A: MASTER optical observation
  36. GRB 181002A: Swift/UVOT Upper Limits
  37. GRB 181003A: Swift-XRT observations
  38. GRB 181003A: Swift detection of a burst
  39. GRB 181002A: Swift-BAT refined analysis
  40. GRB 181002A: MASTER optical observation
  41. GRB 181002A: Swift detection of a burst
  42. Trigger 864882: Swift detection of Crab in its normal state
  43. GRB 180930A: Swift-BAT refined analysis
  44. GRB 180930A: Swift-XRT refined Analysis
  45. GRB 180930A: Swift/UVOT Upper Limits
  46. GRB 180930A: Swift detection of a burst
  47. INTEGRAL detections of the prompt gamma-ray emission of GRB 180914B
  48. GRB 180924A: Swift/UVOT Upper Limits
  49. GRB 180925A: Insight-HXMT/HE detection
  50. GRB 180925A: Swift/UVOT Detection
  51. GRB 180925A: Swift-BAT refined analysis
  52. GRB 180925A: Swift-XRT refined Analysis
  53. GRB 180925A: Swift detection of a burst
  54. GRB 180924A: MASTER inspection
  55. GRB 180924A: Swift-XRT refined Analysis
  56. GRB 180924A: Swift-BAT refined analysis
  57. GRB 180923B: Fermi GBM detection
  58. GRB 180924A: Swift detection of a burst
  59. Swift Trigger 863053 is not an astrophysical event
  60. GRB 180923A: CALET Gamma-Ray Burst Monitor detection
  61. GRB 180923A: MASTER inspection MAXI/GSC error box
  62. GRB 180914B: OAJ multi-color follow-up
  63. IPN Triangulation of GRB 180914A (long)
  64. GRB 180914B: MASTER OT automatic dtection
  65. GRB 180914B: AGILE/MCAL refined analysis
  66. GRB 180914A: RATIR Optical and NIR Observations
  67. GRB 180914B: Fermi-LAT detection
  68. GRB 180914A: MASTER automatic inspection
  69. GRB 180914A: Fermi GBM detection
  70. GRB 180914A: Fermi-LAT detection
  71. IceCube-180908A: CALET Gamma-Ray Burst Monitor upper limits
  72. GRB 180905A: Swift/UVOT Upper Limits
  73. GRB 180905A, Swift-BAT refined analysis
  74. GRB 180905A: RATIR Optical and NIR Observations
  75. GRB 180905A: Swift-XRT refined Analysis
  76. GRB 180904A: BOOTES-2/TELMA early observations
  77. GRB 180905A: BOOTES-3/YA optical observations
  78. GRB 180904A: Swift/UVOT Upper Limits
  79. GRB 180904A: RATIR Optical and NIR Observations
  80. GRB 180904A: Swift-BAT refined analysis
  81. Fermi GBM trigger 557852757/180905629 is not a GRB
  82. GRB 180905A: Swift detection of a burst
  83. GRB 180904A: Swift-XRT refined Analysis
  84. GRB 180904A: LT early observations
  85. GRB 180904A: SAO RAS optical observations
  86. GRB 180904A: Swift detection of a burst
  87. GRB 180828A: Swift/UVOT Upper Limits
  88. GRB 180828A: RATIR Optical and NIR Observations
  89. GRB 180828A: Swift-BAT refined analysis
  90. GRB 180828A: Swift-XRT refined Analysis
  91. GRB 180828A: Fermi GBM observation
  92. GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548
  93. Fermi GBM trigger 557014342/180826925 is not a GRB
  94. Fermi GBM trigger 557008382/180826856 is not a GRB
  95. GRB 180824A: MASTER inspection IPN short GRB error box
  96. GRB 180823A, Swift-BAT refined analysis
  97. GRB 180823A: Swift/UVOT Upper Limits
  98. GRB 180823A: RATIR Optical and NIR Observations
  99. GRB 180823A: Swift-XRT refined Analysis
  100. GRB 180823A: Swift detection of a burst

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