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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"

21526 results found.

  1. GRB 220921A: MeerLICHT afterglow observations
  2. GRB 220921A: Swift-XRT Observations
  3. GRB 220921A: Fermi-LAT detection
  4. GRB 220921A: Tiled Swift observations
  5. GRB 220909A: Fermi GBM observation
  6. GRB 220909A: Swift-XRT observations
  7. IPN triangulation of GRB 220905A
  8. GRB 220909A: Swift ToO observations
  9. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  10. GRB 220907A: Swift-BAT refined analysis
  11. GRB 220831A: Gemini-South/GMOS detection of potential optical counterpart
  12. IPN triangulation of GRB 220903A (long)
  13. GRB 220907A: Fermi GBM observation
  14. GRB 220907A: Nanshan/NEXT optical upper limits
  15. GRB 220907A: Swift/UVOT Upper Limits
  16. GRB 220907A: Swift-XRT refined Analysis
  17. GRB 220831A: ATCA 5/9 GHz radio observations
  18. GRB 220907A: Swift-XRT position
  19. GRB 220907A: Swift detection of a burst
  20. Swift GRB220907.59: Global MASTER-Net observations report
  21. GRB 220831A: Swift-UVOT Upper Limits
  22. GRB 220831A: DECam detection of a possible optical counterpart
  23. GRB 220831A, VLT/HAWK-I near-infrared observations
  24. GRB 220831A: Fermi GBM observation
  25. GRB 220831A: Swift-XRT observations
  26. GRB 220831A: Swift ToO observations
  27. GRB 220831A: Swift/BAT-GUANO localization of a short burst
  28. Konus-Wind detection of GRB 220826A
  29. GRB 220826A: Swift-BAT refined analysis
  30. GRB 220826A: Fermi GBM observation
  31. GRB 220826A: Swift-XRT refined Analysis
  32. GRB 220825A: Fermi GBM observation
  33. GRB 220826A: Lesedi optical afterglow detection
  34. GRB 220826A: Swift/UVOT Detection
  35. Swift GRB 220826A: Global MASTER-Net observations report
  36. GRB 220826A: Enhanced Swift-XRT position
  37. GRB 220826A: Swift detection of a burst with an optical counterpart
  38. GRB 220825A: Swift/BAT-GUANO detection
  39. GRB 220823A: Fermi GBM detection
  40. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  41. Konus-Wind detection of GRB 220813A
  42. GRB 220813A: VLT optical observations and possible host galaxy
  43. GRB 220813A: Swift/UVOT Detection
  44. GRB 220810A: Further Swift-XRT observations
  45. GRB 220813A: Swift-XRT refined Analysis
  46. Swift GRB 220813A: Global MASTER-Net observations report
  47. GRB 220813A: Enhanced Swift-XRT position
  48. GRB 220813A: Swift detection of a burst with an optical counterpart
  49. GRB 220810A: Swift-XRT observations
  50. GRB 220810A: Swift ToO observations
  51. GRB 220806A: Swift-BAT refined analysis
  52. GRB 220806A: Swift detection of a burst
  53. Swift GRB220806.76: Global MASTER-Net observations report
  54. Konus-Wind detection of GRB 220730A (short)
  55. GRB 220730A: Swift-BAT refined analysis
  56. GRB 220730A: Fermi GBM detection
  57. GRB 220730A: Swift-XRT afterglow detection
  58. GRB 220730A: Swift/UVOT Upper Limits
  59. GRB 220730A: Swift-XRT observations
  60. Swift GRB 220730A: Global MASTER-Net observations report
  61. GRB 220730A: Swift detection of a short hard burst
  62. GRB 220715B: VIRT Optical Upper Limit
  63. GRB 220711B: CALET Gamma-Ray Burst Monitor detection
  64. GRB 220715B: Swift-BAT refined analysis
  65. GRB220714B: UVOT detections
  66. GRB 220715B: Fermi GBM detection
  67. GRB 220715B: Swift-XRT refined Analysis
  68. GRB 220715B: Swift/UVOT Upper Limits
  69. GRB 220715B: Enhanced Swift-XRT position
  70. GRB 220715B: BOOTES-network optical upper limits
  71. Swift GRB 220715B: Global MASTER-Net observations report
  72. GRB 220715B: Prompt enhanced Swift-XRT position
  73. GRB 220715B: Swift detection of a burst
  74. GRB 220714B: Swift-BAT refined analysis
  75. GRB 220714B: Fermi GBM observation
  76. GRB 220714B: LCO Optical Observations
  77. GRB 220714B: Swift-XRT refined Analysis
  78. Swift/BAT Trigger 1116172 (=GRB 220714A) is not a real astrophysical event
  79. GRB 220714B: UVOT afterglow discovery
  80. GRB 220714B: Enhanced Swift-XRT position
  81. GRB 220714B: Swift detection of a burst
  82. GRB 220714A: Possible Swift detection of a burst
  83. GRB 220710A: Swift/UVOT Upper Limits
  84. GRB 220711C: Fermi GBM Observation
  85. GRB 220710A: Swift-XRT afterglow detection
  86. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  87. GRB 220711B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  88. GRB 220711B: GIT optical upper limits
  89. GRB 220712B: NOT optical afterglow confirmation
  90. GRB 220710A: Swift ToO observations
  91. GRB 220710A: Swift/BAT-GUANO arcminute localization
  92. GRB 220711B: Swift-BAT refined analysis
  93. IPN triangulation of GRB 220711C (short)
  94. GRB 220711B: Swift-XRT refined Analysis
  95. GRB 220711B: Swift/UVOT Upper Limits
  96. GRB 220711B: Enhanced Swift-XRT position
  97. GRB 220711B: Fermi GBM Detection
  98. GRB 220711B: NOT optical observations
  99. GRB 220711B: LCO Optical Upper Limits
  100. GRB 220711B: Swift detection of a burst

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