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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"

37356 results found.

  1. IPN triangulation of GRB 240112A (long)
  2. GRB 240115B: AstroSat CZTI detection
  3. LIGO/Virgo/KAGRA S240109a: Upper limits from Swift/BAT-GUANO
  4. GRB 240115B: Fermi GBM Detection
  5. GRB 240112D: Glowbug gamma-ray detection
  6. GRB 240112C: Glowbug gamma-ray detection
  7. GRB 240112C: VZLUSAT-2 detection
  8. GRB 240107A: VZLUSAT-2 detection
  9. Fermi GRB 240115B: Global MASTER-Net observations report
  10. GRB 240115B: A long GRB detected by INTEGRAL
  11. GRB 240115B: Fermi GBM Final Real-time Localization
  12. Konus-Wind detection of GRB 240112C
  13. Fermi GRB 240115A: Global MASTER-Net observations report
  14. GRB 240115A: Fermi GBM Final Real-time Localization
  15. GRB 240112C: GRBAlpha detection
  16. GRB 240114A: MAXI/GSC detection
  17. GRB 240112C: Swift/UVOT Detection
  18. GRB 240112C: Fermi GBM Detection
  19. GRB 240112C: Swift-XRT refined Analysis
  20. GRB 240112C: SAO RAS optical observations
  21. GRB 240112E: Fermi GBM Final Localization
  22. Fermi GRB 240112D: Global MASTER-Net observations report
  23. GRB 240112D: Fermi GBM Final Real-time Localization
  24. Swift GRB 240112C: Global MASTER-Net observations report
  25. Fermi GRB 240112B: Global MASTER-Net observations report
  26. GRB 240109A: Swift-BAT refined analysis
  27. GRB 240112C: Swift detection of a burst with an optical counterpart
  28. GRB 240112B: Fermi GBM Final Real-time Localization
  29. GRB 240112A: GECAM detection of a burst
  30. GRB 240109A: Fermi GBM Observation
  31. GRB 240110A: AstroSat CZTI detection
  32. GRB 240108A: Glowbug gamma-ray detection
  33. GRB 231214A: ATCA Radio Upper Limits
  34. GRB 240106B: Glowbug gamma-ray detection
  35. GRB 240106A: Glowbug gamma-ray detection
  36. GRB 240109B: Fermi GBM Final Real-time Localization
  37. IceCube-240105A: Three candidates from the Zwicky Transient Facility
  38. Konus-Wind detection of GRB 240101C
  39. GRB 231215A: radio detection with the VLA
  40. GRB 230818A: further radio observations with the VLA
  41. GRB 230812B: further radio observations with the VLA
  42. GRB 240107A: AstroSat CZTI detection
  43. GRB 240109A: Swift detection of a short burst
  44. LIGO/Virgo/KAGRA S240104bl: Upper limits from Swift/BAT-GUANO
  45. GRB 240106A: GRBAlpha detection
  46. GRB 240107A: MAXI/GSC detection
  47. GRB 240106B: Fermi GBM Final Real-time Localization
  48. GRB 240106A: Fermi GBM Final Real-time Localization
  49. IPN triangulation of GRB 240101C (short)
  50. GRB GRB240101C: Fermi GBM observation
  51. GRB 240101A: 1.3m DFOT optical observations
  52. GRB 240102A: 1.3m DFOT optical upper limit
  53. GRB 240101B: 1.3m DFOT optical upper limit
  54. GRB 240101C: Swift/BAT-GUANO detection of a short burst
  55. GRB 240102C: AstroSat CZTI detection
  56. GRB 240101C: AstroSat CZTI detection
  57. GRB 231220A: Swift-UVOT upper limit
  58. GRB 240102A: Swift-BAT refined analysis
  59. GRB 240102A: Swift/UVOT Upper Limits
  60. GRB 231230A: Swift-BAT refined analysis
  61. GRB 240101A: Swift-BAT refined analysis
  62. GRB 240101B: Swift-BAT refined analysis
  63. GRB 240102A: Enhanced Swift-XRT position
  64. GRB 240101B: Swift-XRT refined Analysis
  65. GRB 240102A: Swift-XRT refined Analysis
  66. GRB 240102B (Fermi GBM trigger 725926335/240102925) is not a GRB
  67. GRB 240102A: LCOGT Optical Upper Limits
  68. GRB240102A: BOOTES-6/DPRT optical upper limit
  69. GRB 240102B: Fermi GBM Final Real-time Localization
  70. GRB 240101B: MarSEC Observatory, Vicenza, Italy, UPPER LIMIT
  71. GRB 240102A: Swift detection of a burst
  72. GRB 240101A: Terskol Zeiss-2000 optical observations
  73. GRB 240101C: GRBAlpha detection
  74. GRB 240101B: Swift/UVOT Upper Limits
  75. GRB 240101A: Swift/UVOT Upper Limits
  76. GRB 240101A: Swift-XRT refined Analysis
  77. GRB 240101B: Enhanced Swift-XRT position
  78. GRB 240101B: KAIT Optical Upper Limit
  79. GRB 240101A: KAIT Optical Upper Limit
  80. GRB 240101A: Enhanced Swift-XRT position
  81. GRB 240101C: Fermi GBM Final Localization
  82. GRB 240101B: Swift detection of a burst
  83. GRB 240101A: Swift detection of a burst
  84. GRB231230A: Fermi GBM Observation
  85. GRB 231230A: Swift-XRT refined Analysis
  86. GRB 231230A: GOTO optical upper limits
  87. GRB 231230A: Enhanced Swift-XRT position
  88. GRB 231230A: Swift/UVOT Upper Limits
  89. GRB 231230A: NOT optical upper limits
  90. GRB 231230A: Prompt enhanced Swift-XRT position
  91. GRB 231230A: Swift detection of a burst
  92. GRB 231230A: Fermi GBM Final Real-time Localization
  93. GRB 231210B: BOOTES-7 optical upper limit
  94. LIGO/Virgo/KAGRA S231224e: Upper limits from Swift/BAT-GUANO
  95. IPN triangulation of GRB 231224A (short)
  96. GRB 231224A: Fermi GBM Final Real-time Localization
  97. GRB 231222B: GRBAlpha detection
  98. GRB 231222B: Swift-XRT afterglow detection
  99. GRB 231222B: Fermi GBM Detection
  100. GRB 231222B: Fermi-LAT detection

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