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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"

19666 results found.

  1. Swift GRB221204.45: Global MASTER-Net observations report
  2. GRB 221202A: Swift/UVOT Detection
  3. GRB 221202A: Swift-BAT refined analysis
  4. GRB 221202A: VLT/FORS2 Afterglow Discovery
  5. GRB 221201A: Swift-BAT refined analysis
  6. GRB 221201A: Fermi GBM observation
  7. GRB 221202A: Swift-XRT refined Analysis
  8. GRB 221202A: Enhanced Swift-XRT position
  9. GRB 221202A: MeerLICHT upper limits
  10. GRB 221202A: Swift detection of a burst
  11. Swift GRB221202.84: Global MASTER-Net observations report
  12. GCN: GRB 221201A: Swift/UVOT Upper Limits
  13. GRB 221201A: Swift-XRT refined Analysis
  14. GRB 221201A: Enhanced Swift-XRT position
  15. Swift GRB 221201A: Global MASTER-Net observations report
  16. Konus-Wind detection of GRB 221124A
  17. GRB 221201A: Swift detection of a burst
  18. GRB 221126A: Fermi GBM observation
  19. GRB 221126A: AGILE detection
  20. GRB 221126A: AstroSat CZTI detection
  21. GRB 221126A: Swift/BAT-GUANO detection outside the coded FOV
  22. IPN triangulation of GRB 221124A (long)
  23. GRB 221124A: Swift/BAT-GUANO detection
  24. GRB 221120A: Detection by VZLUSAT-2
  25. GRB 221009A：DAMPE observed a 34.7 GeV photon at 1.36 hour after the GBM trigger
  26. IPN triangulation of GRB 221121A (long)
  27. GRB 221120A: Swift-BAT refined analysis
  28. GRB 221120A: AKO Telescope Upper Limits
  29. GRB221120A: WIRC near-IR imaging of the afterglow candidate
  30. GRB 221120A: Liverpool Telescope Upper Limits
  31. GRB 221120A: Fermi GBM observation
  32. GRB 221120A: Swift-XRT refined Analysis
  33. GRB 221120A: Enhanced Swift-XRT position
  34. GRB221120A: Montarrenti Observatory Upper Limit
  35. GRB 221120A is a short burst
  36. GRB 221120A: Swift/UVOT Upper Limits
  37. GRB 221120A: GIT upper limits on optical afterglow
  38. GRB 221120A: Swift detection of a likely short burst
  39. GRB 221119A: Fermi-LAT detection
  40. GRB 221009A: Japanese VLBI Network observation
  41. GRB 221115B: CALET Gamma-Ray Burst Monitor detection
  42. Correction to GCN 32646 (GRB 221009A (Swift J1913.1+1946): MeerLICHT observations)
  43. GRB 221115B : MeerLICHT upper limits
  44. GRB 221115A: Fermi GBM detection
  45. GRB 221115B: Swift/BAT-GUANO arcminute localization
  46. GRB 221115A: Swift/BAT-GUANO detection
  47. GRB 221110A: GRANDMA observations
  48. GRB 221009A: GRANDMA/Kilonova-Catcher observations
  49. GRB 221110A: Swift/UVOT Detection and Corrected UVOT Position
  50. GRB 221110A: Swift-BAT refined analysis
  51. GRB 221110A: Swift-XRT refined Analysis
  52. GRB 221110A: Enhanced Swift-XRT position
  53. GRB 221110A: LCOGT Optical Afterglow Detection
  54. GRB 221110A: Swift detection of a burst with an optical counterpart
  55. Swift GRB221110.10: Global MASTER-Net OT detection
  56. Swift GRB221110.10: Global MASTER-Net observations report
  57. GRB 221107A: Fermi GBM Observation
  58. GRB 221107A: Detection by GRBAlpha
  59. GRB 221107A: Swift/BAT-GUANO detection outside the coded FOV
  60. Correction to GCN 32852 (GRB 221009A: SARA-RM 1m Optical Afterglow Detection)
  61. GRB 221029A: CALET Gamma-Ray Burst Monitor detection
  62. High-precision position of the compact radio counterpart to GRB221009A
  63. GRB 221028A: GRANDMA observations
  64. GRB 221027B: GRANDMA observations
  65. GRB 221028A: Detection by VZLUSAT-2
  66. GRB 221028A: Swift-XRT refined Analysis
  67. GRB 221028A: 1.3m DFOT Optical upper limit
  68. GRB 221028A, Swift-BAT refined analysis
  69. GRB 221027B: Swift-BAT refined analysis
  70. GRB 221029A: Swift/BAT-GUANO detection outside the coded FOV
  71. Trigger 1132968: Swift trigger is the Crab
  72. GRB 221028A: HCT optical upper limit
  73. GRB 221028A: AGILE detection
  74. GRB 221028A: MITSuME Okayama optical upper limits
  75. Swift GRB 221028A: Global MASTER-Net observations report
  76. GRB 221028A: BOOTES-4/MET optical upper limit
  77. GRB 221028A: GIT optical upper limit
  78. GRB 221027B: Swift/UVOT Upper Limits
  79. GRB 221028A: Swift detection of a burst
  80. GRB 221027B: FRAM-ORM and Ondrejov SBT optical limits
  81. Swift GRB 221027B: Global MASTER-Net observations report
  82. GRB 221027B: Swift-XRT refined Analysis
  83. GRB 221027B: BOOTES-1 optical upper limit
  84. GRB 221027B: Enhanced Swift-XRT position
  85. GRB 221027B: Swift detection of a burst
  86. Konus-Wind detection of GRB 221022B
  87. GRB 221024A: Mondy optical observations
  88. GRB 221027A: Fermi-LAT detection
  89. GRB 221024A: GRANDMA observations
  90. IPN triangulation of GRB 221022C (short)
  91. GRB 221024A: Swift-BAT refined analysis
  92. GRB 221009A: SARA-RM 1m Optical Afterglow Detection
  93. GRB 221024A: Swift/UVOT UV upper limits
  94. GRB 221022A: Swift-XRT observations
  95. GRB 221024A: Swift-XRT refined Analysis
  96. GRB 221022B: Detection by GRBAlpha
  97. GRB 221025A: Fermi-LAT detection
  98. IPN triangulation of GRB 221022B (long)
  99. GRB 221024A: GIT confirmation of the optical afterglow
  100. GRB 221024A: Enhanced Swift-XRT position

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