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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"

39361 results found.

  1. GRB 240109A: Swift-BAT refined analysis
  2. GRB 240112C: Swift detection of a burst with an optical counterpart
  3. GRB 240112B: Fermi GBM Final Real-time Localization
  4. GRB 240112A: GECAM detection of a burst
  5. GRB 240109A: Fermi GBM Observation
  6. GRB 240110A: AstroSat CZTI detection
  7. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 0446+11, located inside the IceCube-240105A error region
  8. GRB 240108A: Glowbug gamma-ray detection
  9. GRB 231214A: ATCA Radio Upper Limits
  10. GRB 240106B: Glowbug gamma-ray detection
  11. GRB 240106A: Glowbug gamma-ray detection
  12. GRB 240109B: Fermi GBM Final Real-time Localization
  13. IceCube-240105A: Three candidates from the Zwicky Transient Facility
  14. Konus-Wind detection of GRB 240101C
  15. GRB 231215A: radio detection with the VLA
  16. GRB 230818A: further radio observations with the VLA
  17. GRB 230812B: further radio observations with the VLA
  18. Swift GRB240109.17: Global MASTER-Net observations report
  19. GRB 240107A: AstroSat CZTI detection
  20. GRB 240109A: Swift detection of a short burst
  21. LIGO/Virgo/KAGRA S240104bl: Upper limits from Swift/BAT-GUANO
  22. IceCube-240105A: JCMT SCUBA2 Detection of Two Bright Submillimeter Sources
  23. Update of IceCube-240105A - Corrected errors
  24. GRB 240106A: GRBAlpha detection
  25. GRB 240107A: MAXI/GSC detection
  26. Fermi trigger No 726347794: Global MASTER-Net observations report
  27. GRB 240106B: Fermi GBM Final Real-time Localization
  28. Fermi trigger No 726194053: Global MASTER-Net observations report
  29. GRB 240106A: Fermi GBM Final Real-time Localization
  30. IPN triangulation of GRB 240101C (short)
  31. GRB GRB240101C: Fermi GBM observation
  32. IceCube Alert 240105.52: Global MASTER-Net observations report
  33. GRB 240101A: 1.3m DFOT optical observations
  34. IceCube-240105A - IceCube observation of a high-energy neutrino candidate track-like event
  35. GRB 240102A: 1.3m DFOT optical upper limit
  36. GRB 240101B: 1.3m DFOT optical upper limit
  37. GRB 240101C: Swift/BAT-GUANO detection of a short burst
  38. GRB 240102C: AstroSat CZTI detection
  39. GRB 240101C: AstroSat CZTI detection
  40. GRB 231220A: Swift-UVOT upper limit
  41. GRB 240102A: Swift-BAT refined analysis
  42. GRB 240102A: Swift/UVOT Upper Limits
  43. GRB 231230A: Swift-BAT refined analysis
  44. GRB 240101A: Swift-BAT refined analysis
  45. GRB 240101B: Swift-BAT refined analysis
  46. GRB 240102A: Enhanced Swift-XRT position
  47. GRB 240101B: Swift-XRT refined Analysis
  48. GRB 240102A: Swift-XRT refined Analysis
  49. GRB 240102B (Fermi GBM trigger 725926335/240102925) is not a GRB
  50. GRB 240102A: LCOGT Optical Upper Limits
  51. Fermi trigger No 725857207: Global MASTER-Net observations report
  52. GRB240102A: BOOTES-6/DPRT optical upper limit
  53. GRB 240102B: Fermi GBM Final Real-time Localization
  54. GRB 240101B: MarSEC Observatory, Vicenza, Italy, UPPER LIMIT
  55. GRB 240102A: Swift detection of a burst
  56. GRB 240101A: Terskol Zeiss-2000 optical observations
  57. GRB 240101C: GRBAlpha detection
  58. GRB 240101B: Swift/UVOT Upper Limits
  59. GRB 240101A: Swift/UVOT Upper Limits
  60. GRB 240101A: Swift-XRT refined Analysis
  61. GRB 240101B: Enhanced Swift-XRT position
  62. GRB 240101B: KAIT Optical Upper Limit
  63. GRB 240101A: KAIT Optical Upper Limit
  64. GRB 240101A: Enhanced Swift-XRT position
  65. GRB 240101C: Fermi GBM Final Localization
  66. Swift GRB240101.85: Global MASTER-Net observations report
  67. GRB 240101B: Swift detection of a burst
  68. GRB 240101A: Swift detection of a burst
  69. Fermi trigger No 725806648: Global MASTER-Net observations report
  70. GRB231230A: Fermi GBM Observation
  71. GRB 231230A: Swift-XRT refined Analysis
  72. GRB 231230A: GOTO optical upper limits
  73. GRB 231230A: Enhanced Swift-XRT position
  74. GRB 231230A: Swift/UVOT Upper Limits
  75. GRB 231230A: NOT optical upper limits
  76. Fermi trigger No 725592555: Global MASTER-Net observations report
  77. GRB 231230A: Prompt enhanced Swift-XRT position
  78. GRB 231230A: Swift detection of a burst
  79. Swift GRB231230.06: Global MASTER-Net observations report
  80. GRB 231230A: Fermi GBM Final Real-time Localization
  81. GRB 231210B: BOOTES-7 optical upper limit
  82. LIGO/Virgo/KAGRA S231224e: Upper limits from Swift/BAT-GUANO
  83. IPN triangulation of GRB 231224A (short)
  84. Fermi trigger No 725143760: Global MASTER-Net observations report
  85. GRB 231224A: Fermi GBM Final Real-time Localization
  86. GRB 231222B: GRBAlpha detection
  87. GRB 231222B: Swift-XRT afterglow detection
  88. Fermi trigger No 724921799: Global MASTER-Net observations report
  89. GRB 231222B: Fermi GBM Detection
  90. LAT GRB231222.31: Global MASTER-Net observations report
  91. GRB 231222B: Fermi-LAT detection
  92. GRB 231222A: Tiled Swift observations
  93. GRID detection of GRB 231215A
  94. GRB 231222A: Fermi GBM Final Real-time Localization
  95. GRB 231220A: Swift-XRT follow-up observations
  96. GRB 231220A: Swift ToO observations
  97. GRB 231220A: Swift/BAT-GUANO arcminute localization of a long burst
  98. Fermi trigger No 724781422: Global MASTER-Net observations report
  99. GRB 231220A: Fermi GBM Final Real-time Localization
  100. GRB 231210B: new optical transient detected with the Greenhill Observatory University of Tasmania within the BAT-Swift enhanced position

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