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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"

19670 results found.

  1. GRB 190718A: Swift-XRT refined Analysis
  2. GRB 190718A: Swift/UVOT Upper Limits
  3. GRB 190718A: FRAM-Auger optical limit
  4. GRB 190718A: Enhanced Swift-XRT position
  5. Swift GRB190718.2 Global MASTER-Net observations report
  6. GRB 190718A: Swift detection of a burst
  7. GRB 190613B: FRAM-Auger afterglow detection
  8. GRB 190714A: an X-ray flare from 2E 1624.6+1504/UCAC4 525-061488
  9. GRB 190708B: confirmation of the X-ray afterglow
  10. GRB 190714A: Tiled Swift observations
  11. GRB 190708B: Swift-XRT observations
  12. LIGO/Virgo S190707q: No counterpart candidates in the Swift/BAT Observations
  13. GRB 190708B: Tiled Swift observations
  14. IPN triangulation of GRB 190706D (short)
  15. IPN triangulation of GRB 190706C (long/very bright)
  16. LIGO/Virgo S190706ai: No counterpart candidates in the Swift/BAT Observations
  17. IPN triangulation of GRB 190704A (short)
  18. GRB 190706B: Swift/UVOT Detection
  19. GRB 190706B: Swift-BAT refined analysis
  20. GRB 190706B: Swift-XRT refined Analysis
  21. GRB 190706B: Enhanced Swift-XRT position
  22. GRB 190706B: Prompt enhanced Swift-XRT position
  23. GRB 190706B: Swift detection of a burst
  24. GRB 190627A: Discovery Channel Telescope late time observations
  25. Trigger 913042: Swift triggered on noise peak
  26. GRB 190701A, Swift-BAT refined analysis
  27. LIGO/Virgo S190701ah: No counterpart candidates in the Swift/BAT Observations
  28. GRB 190701A: Swift-XRT refined Analysis
  29. GRB 190630C: Swift-XRT refined Analysis
  30. GRB 190701A: Swift/UVOT Upper Limits
  31. GRB 190630C: ISON-Castelgrande optical upper limit
  32. GRB 190630C: Swift/UVOT Upper Limits
  33. GRB 190630C: KAIT Optical Upper Limit
  34. GRB 190630B: Swift/UVOT Upper Limits
  35. GRB 190630C: Swift-BAT refined analysis
  36. GRB 190701A: Enhanced Swift-XRT position
  37. GRB 190630C: AstroSat CZTI detection
  38. LIGO/Virgo S190630ag: No counterpart candidates in the Swift/BAT Observations
  39. GRB 190701A: MAXI/GSC detection
  40. GRB 190701A: Prompt enhanced Swift-XRT position
  41. GRB 190701A: Swift detection of a burst
  42. GRB 190630B: KAIT Optical Afterglow Confirmation
  43. GRB 190630C: Enhanced Swift-XRT position
  44. Swift GRB190631. Global MASTER-Net observations report
  45. GRB 190630C: Swift detection of a burst
  46. GRB 190630B: Swift-XRT refined Analysis
  47. GRB 190630B, Swift-BAT refined analysis
  48. GRB Swift Trigger 912102: KAIT Optical Afterglow Candidate
  49. Swift Trigger 912102: possible GRB 190630B
  50. GRB 190627A: Swift-XRT refined Analysis
  51. GRB 190627A: Swift-BAT refined analysis (short-soft burst)
  52. GRB 190610A: Further Swift-XRT observations
  53. GRB 190627A: MASTER optical counterpart observation
  54. GRB 190627A: Montarrenti Observatory optical detection
  55. GRB 190627A: Enhanced Swift-XRT position
  56. GRB 190627A: Swift/UVOT Detection
  57. GRB 190627A: Swift detection of a burst
  58. Swift Trigger 911102 is likely not an astrophysical event
  59. Swift GRB190624.86 Global MASTER-Net observations report
  60. Swift trigger 911102: D50 optical limit
  61. Swift Trigger 911102: a possible GRB
  62. LIGO/Virgo S190426c: Swift UVOT - no new counterpart candidates identified
  63. LIGO/Virgo S190510g: Swift UVOT - no new counterpart candidates identified
  64. GRB 190613B: AstroSat CZTI detection
  65. Konus-Wind observation of GRB 190613B
  66. GRB 190610A: Swift/UVOT Upper Limits
  67. GRB 190610A: Swift-XRT observations
  68. GRB 190613B: GROND Detection of the Optical/NIR Afterglow
  69. GRB 190613B: Insight-HXMT/HE detection
  70. Konus-Wind observation of short/hard GRB 190610A
  71. GRB 190613B: BOOTES-5/JGT early optical observations
  72. GRB 190613B: Swift-XRT refined Analysis
  73. GRB 190610A: Swift ToO observations
  74. GRB 190613B: Swift-BAT refined analysis
  75. GRB 190613A, Swift-BAT refined analysis
  76. GRB 190613B: KAIT Optical Afterglow Confirmation
  77. GRB 190613B: Swift/UVOT Detection
  78. GRB 190613A: Fermi GBM detection
  79. GRB 190613A: Swift/UVOT Detection
  80. GRB 190613B: Fermi GBM observation
  81. GRB 190613B: Enhanced Swift-XRT position
  82. IPN Triangulation of GRB 190611B
  83. GRB 190613A: Swift-XRT refined Analysis
  84. GRB 190613A: Enhanced Swift-XRT position
  85. GRB 190613B: Swift detection of a burst with an optical counterpart
  86. GRB 190610A: CALET Gamma-Ray Burst Monitor detection
  87. GRB 190613A: MASTER OT detection
  88. Swift GRB190613.17 Global MASTER-Net observations report
  89. GRB 190613A: KAIT Optical Afterglow Confirmation
  90. GRB 190613A: Swift detection of a burst with an optical counterpart
  91. GRB 190611A: Swift-XRT refined Analysis
  92. GRB 190611A: Swift/UVOT Upper Limits
  93. GRB 190611A, Swift-BAT refined analysis
  94. GRB 190611A: Enhanced Swift-XRT position
  95. GRB 190611A: Swift detection of a burst
  96. GRB 190610A: Swift-BAT refined analysis
  97. GRB 190610A: Insight-HXMT/HE detection
  98. GRB 190610A: Swift detection of a short burst
  99. LIGO/Virgo S190425z: Swift UVOT - no new sources identified, and a summary of the Swift UVOT processing of GW triggers.
  100. GRB 190604B: Kitab observatory optical upper limit

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