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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"

27832 results found.

  1. GRB221120A: Montarrenti Observatory Upper Limit
  2. GRB 221121A: Fermi GBM Final Real-time Localization
  3. GRB 221120A is a short burst
  4. GRB 221120A: Swift/UVOT Upper Limits
  5. GRB 221120A: GIT upper limits on optical afterglow
  6. GRB 221120A: Swift detection of a likely short burst
  7. GRB 221119A: Fermi GBM detection
  8. GRB 221119A: Detection by GRBAlpha
  9. GRB 221119A: Fermi-LAT detection
  10. GRB 221119A: Fermi GBM Final Real-time Localization
  11. GRB 221009A: Japanese VLBI Network observation
  12. GRB 221115B: CALET Gamma-Ray Burst Monitor detection
  13. GRB 221114A: CALET Gamma-Ray Burst Monitor detection
  14. GRB 221118A: Fermi GBM Final Real-time Localization
  15. Correction to GCN 32646 (GRB 221009A (Swift J1913.1+1946): MeerLICHT observations)
  16. GRB 221115B : MeerLICHT upper limits
  17. GRB 221115A: Fermi GBM detection
  18. GRB 221115B: Swift/BAT-GUANO arcminute localization
  19. GRB 221115A: Swift/BAT-GUANO detection
  20. GRB 221110A: GRANDMA observations
  21. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 November 9
  22. GRB 221112A: Detection by GRBAlpha
  23. GRB 221112A: Fermi GBM Final Real-time Localization
  24. GRB 221009A: GRANDMA/Kilonova-Catcher observations
  25. GRB 221110A: Swift/UVOT Detection and Corrected UVOT Position
  26. GRB 221110A: Swift-BAT refined analysis
  27. GRB 221110A: Swift-XRT refined Analysis
  28. GRB 221110A: Enhanced Swift-XRT position
  29. GRB 221110A: VLT/X-shooter redshift
  30. GRB 221110A: COATLI Afterglow detection
  31. GRB 221110A: LCOGT Optical Afterglow Detection
  32. GRB 221110A: Swift detection of a burst with an optical counterpart
  33. Swift GRB221110.10: Global MASTER-Net OT detection
  34. Swift GRB221110.10: Global MASTER-Net observations report
  35. GRB 221104A: Fermi GBM Final Localization
  36. GRB 221108A: Fermi GBM Final Localization
  37. GRB 221107A: Fermi GBM Observation
  38. GRB 221107A: Detection by GRBAlpha
  39. GRB 221107A: Swift/BAT-GUANO detection outside the coded FOV
  40. GRB 221107A: Fermi GBM Final Localization
  41. Correction to GCN 32852 (GRB 221009A: SARA-RM 1m Optical Afterglow Detection)
  42. IceCube-221104A - IceCube observation of a high-energy neutrino candidate track-like event
  43. GRB 221029A: CALET Gamma-Ray Burst Monitor detection
  44. High-precision position of the compact radio counterpart to GRB221009A
  45. GRB 221028A: GRANDMA observations
  46. GRB 221027B: GRANDMA observations
  47. GRB 221028A: Detection by VZLUSAT-2
  48. GRB 221027C: AstroSat CZTI detection
  49. Konus-Wind detection of GRB 221022C
  50. GRB 221029A: Fermi GBM Final Localization
  51. GRB 221028A: Swift-XRT refined Analysis
  52. GRB 221028A: 1.3m DFOT Optical upper limit
  53. GRB 221028A, Swift-BAT refined analysis
  54. GRB 221027B: Swift-BAT refined analysis
  55. GRB 221029A: Swift/BAT-GUANO detection outside the coded FOV
  56. GRB 221029A: Detection by GRBAlpha
  57. Trigger 1132968: Swift trigger is the Crab
  58. GRB 221028A: HCT optical upper limit
  59. GRB 221028A: AGILE detection
  60. GRB 221027A: AGILE detection
  61. GRB 221028A: MITSuME Okayama optical upper limits
  62. GRB 221028B: MAXI/GSC detection
  63. Swift GRB 221028A: Global MASTER-Net observations report
  64. GRB 221028A: BOOTES-4/MET optical upper limit
  65. GRB 221028A: GIT optical upper limit
  66. GRB 221027B: Swift/UVOT Upper Limits
  67. GRB 221028A: Swift detection of a burst
  68. GRB 221027B: FRAM-ORM and Ondrejov SBT optical limits
  69. Konus-Wind detection of GRB 221017A
  70. Swift GRB 221027B: Global MASTER-Net observations report
  71. GRB 221027B: Swift-XRT refined Analysis
  72. GRB 221027B: BOOTES-1 optical upper limit
  73. GRB 221027B: Enhanced Swift-XRT position
  74. GRB 221027B: Swift detection of a burst
  75. GRB 221027A: Fermi GBM detection
  76. IPN triangulation of GRB 221025A (short)
  77. Konus-Wind detection of GRB 221022B
  78. GRB 221024A: Mondy optical observations
  79. GRB 221027A: Fermi-LAT detection
  80. GRB 221027A: Fermi GBM Final Real-time Localization
  81. GRB 221024A: GRANDMA observations
  82. IPN triangulation of GRB 221022C (short)
  83. GRB 221023A: AGILE/GRID analysis
  84. SGR 1935+2154: AstroSat CZTI Detections
  85. GRB 221024A: Swift-BAT refined analysis
  86. GRB 221025A: AstroSat CZTI detection
  87. GRB 221009A: SARA-RM 1m Optical Afterglow Detection
  88. GRB 221009A: spectroscopic confirmation of SN in LBT spectra
  89. Konus-Wind detection of GRB 221023A
  90. GRB 221024A: Swift/UVOT UV upper limits
  91. GRB 221022A: Swift-XRT observations
  92. GRB 221024A: Swift-XRT refined Analysis
  93. GRB 221022B: Detection by GRBAlpha
  94. GRB 221025A: Fermi-LAT detection
  95. IPN triangulation of GRB 221022B (long)
  96. GRB 221024A: GIT confirmation of the optical afterglow
  97. GRB 221024A: Enhanced Swift-XRT position
  98. GRB 221024A: D50 candidate afterglow
  99. GRB 221022B: AstroSat CZTI detection
  100. GRB 221022A: Fermi GBM detection

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