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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"

36385 results found.

  1. GRB 221226B: Swift-UVOT Detection
  2. GRB 221226A: AGILE detection
  3. GRB 221226B: Fermi GBM Observation
  4. GRB 221226B: Swift-XRT refined Analysis
  5. GRB 221226B: VLT/X-shooter redshift and host galaxy
  6. GRB 221226B: Enhanced Swift-XRT position
  7. GRB 221226B: Swift detection of a burst
  8. GRB 221226B: Fermi GBM Final Real-time Localization
  9. Fermi GRB 221226A: Global MASTER-Net observations report
  10. GRB 221226A: Fermi GBM Final Real-time Localization
  11. Fermi GRB 221223A: Global MASTER-Net observations report
  12. GRB 221223A: Fermi GBM Final Real-time Localization
  13. GRB 221221A: AGILE detection
  14. Fermi GRB 221221A: Global MASTER-Net observations report
  15. GRB 221221A: Fermi GBM Final Real-time Localization
  16. GRB 221218A: 3.6m DOT optical upper limit
  17. GRB 221216A: Detection by VZLUSAT-2
  18. GRB 221218A: MITSuME Akeno optical upper limits
  19. GRB 221218A: BOOTES-4/MET and OSN optical upper limits
  20. GRB 221218A: KAIT Optical Upper Limit
  21. GRB 221215A: Fermi GBM Detection
  22. GRB 221218A: a long GRB detected by INTEGRAL
  23. GRB 221216A: Swift/UVOT Upper Limits
  24. GRB 221216A: Fermi GBM observation
  25. GRB 221216A: Swift-XRT refined Analysis
  26. GRB 221216A: AKO Upper Limit
  27. GRB 221215A: Swift-XRT observations
  28. GRB 221216A: Enhanced Swift-XRT position
  29. Swift GRB 221216A: Global MASTER-Net observations report
  30. GRB 221216A: Zadko observatory - Gingin optical observations
  31. GRB 221216A: Nanshan/NEXT optical upper limits
  32. GRB 221216A: Swift detection of a burst
  33. GRB 221216A: Fermi GBM Final Real-time Localization
  34. GRB 221215A: Swift ToO observations
  35. GRB 221215A: Swift/BAT-GUANO arcminute localization
  36. Konus-Wind detection of GRB 221209A
  37. Fermi GRB 221215B: Global MASTER-Net observations report
  38. IPN triangulation of GRB 221209A (long)
  39. GRB 221215B: Fermi GBM Final Real-time Localization
  40. Fermi Gamma-ray Burst Monitor trigger 692760884/221215066 is not a GRB
  41. GRB 221215A: Fermi GBM Final Real-time Localization
  42. Swift Trigger 1144538 is not a GRB
  43. GRB 221209A: CALET Gamma-Ray Burst Monitor detection
  44. GRB 221212A: Fermi GBM Final Real-time Localization
  45. Fermi GRB 221211A: Global MASTER-Net observations report
  46. GRB 221208A: AstroSat CZTI detection
  47. GRB 221211A: Fermi GBM Final Real-time Localization
  48. GRB 221009A: MuSCAT3 observations
  49. GRB 221209A: AstroSat CZTI detection
  50. GRB 221210A: Fermi GBM Final Real-time Localization
  51. GRB 221209B: Fermi GBM Final Real-time Localization
  52. GRB 221209A: Fermi GBM observation
  53. GRB 221203C: AstroSat CZTI detection
  54. GRB 221209A: BALROG localization (Fermi Trigger 692257829 / GRB 221209243)
  55. GRB 221209A: Fermi GBM Final Real-time Localization
  56. GRB 221206B: Fermi GBM observation
  57. GRB 221206B: Swift-XRT observations
  58. GRB 221206B: Detection by GRBAlpha
  59. GRB 221206B: Swift/BAT-GUANO candidate arcminute localization
  60. GRB 221206B: Swift ToO observations
  61. Swift/BAT trigger #1143281 is not a GRB
  62. GRB 221206C: Fermi GBM Final Real-time Localization
  63. GRB 221206B: Fermi GBM Final Real-time Localization
  64. GRB 221206A: Fermi GBM Final Real-time Localization
  65. GRB 221205A: Fermi GBM Final Real-time Localization
  66. GRB 221202B: Detection by VZLUSAT-2
  67. GRB 221203B: Fermi GBM Final Real-time Localization
  68. GRB 221202A: Swift/UVOT Detection
  69. GRB 221202A: Swift-BAT refined analysis
  70. GRB 221202A: VLT/FORS2 Afterglow Discovery
  71. GRB 221201A: Swift-BAT refined analysis
  72. GRB 221203A: Fermi GBM Final Real-time Localization
  73. GRB 221201A: Fermi GBM observation
  74. GRB 221202A: Swift-XRT refined Analysis
  75. GRB 221202A: LCOGT Optical Upper Limits
  76. GRB 221202A: Enhanced Swift-XRT position
  77. GRB 221202A: MeerLICHT upper limits
  78. GRB 221202B: Fermi GBM Final Real-time Localization
  79. GRB 221202A: Swift detection of a burst
  80. GCN: GRB 221201A: Swift/UVOT Upper Limits
  81. GRB 221201A: Swift-XRT refined Analysis
  82. GRB 221201A: Enhanced Swift-XRT position
  83. Swift GRB 221201A: Global MASTER-Net observations report
  84. Konus-Wind detection of GRB 221124A
  85. GRB 221201A: Swift detection of a burst
  86. GRB 221201A: Fermi GBM Final Real-time Localization
  87. Fermi Gamma-ray Burst Monitor trigger 691534074/221130867 is not a GRB
  88. Optical polarization observation of GRB 221009A
  89. GRB 221126A: Fermi GBM observation
  90. GRB 221126A: AGILE detection
  91. GRB 221127A: Detection by GRBAlpha
  92. GRB 221126A: AstroSat CZTI detection
  93. GRB 221126A: Swift/BAT-GUANO detection outside the coded FOV
  94. IPN triangulation of GRB 221124A (long)
  95. GRB 221126A: Fermi GBM Final Real-time Localization
  96. GRB 221124A: Swift/BAT-GUANO detection
  97. GRB 221120A: Detection by VZLUSAT-2
  98. GRB 221124A: CALET Gamma-Ray Burst Monitor detection
  99. GRB 221120A: TURBO Optical Upper Limit
  100. GRB 221122A: Detection by GRBAlpha

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