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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"

28236 results found.

  1. IceCube-240105A: ZTF optical observation of blazar PKS 0446+11
  2. GRB 240112D: Glowbug gamma-ray detection
  3. GRB 240112C: Glowbug gamma-ray detection
  4. GRB 240112C: VZLUSAT-2 detection
  5. GRB 240107A: VZLUSAT-2 detection
  6. GRB 240115B: Fermi GBM Final Real-time Localization
  7. Konus-Wind detection of GRB 240112C
  8. GRB 240115A: Fermi GBM Final Real-time Localization
  9. GRB 240112C: GRBAlpha detection
  10. GRB 240114A: MAXI/GSC detection
  11. GRB 240112C: Swift/UVOT Detection
  12. GRB 240112C: Fermi GBM Detection
  13. GRB 240112C: Swift-XRT refined Analysis
  14. GRB 240112E: Fermi GBM Final Localization
  15. GRB 240112D: Fermi GBM Final Real-time Localization
  16. GRB 240112C: Swift detection of a burst with an optical counterpart
  17. GRB 240112B: Fermi GBM Final Real-time Localization
  18. GRB 240112A: GECAM detection of a burst
  19. GRB 240110A: AstroSat CZTI detection
  20. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 0446+11, located inside the IceCube-240105A error region
  21. GRB 240108A: Glowbug gamma-ray detection
  22. GRB 231214A: ATCA Radio Upper Limits
  23. GRB 240106B: Glowbug gamma-ray detection
  24. GRB 240106A: Glowbug gamma-ray detection
  25. GRB 240109B: Fermi GBM Final Real-time Localization
  26. Konus-Wind detection of GRB 240101C
  27. GRB 231215A: radio detection with the VLA
  28. GRB 230812B: further radio observations with the VLA
  29. GRB 240107A: AstroSat CZTI detection
  30. GRB 240109A: Swift detection of a short burst
  31. IceCube-240105A: JCMT SCUBA2 Detection of Two Bright Submillimeter Sources
  32. GRB 240106A: GRBAlpha detection
  33. GRB 240107A: MAXI/GSC detection
  34. GRB 240106B: Fermi GBM Final Real-time Localization
  35. GRB 240106A: Fermi GBM Final Real-time Localization
  36. IPN triangulation of GRB 240101C (short)
  37. GRB 240101A: 1.3m DFOT optical observations
  38. IceCube-240105A - IceCube observation of a high-energy neutrino candidate track-like event
  39. GRB 240102A: 1.3m DFOT optical upper limit
  40. GRB 240101B: 1.3m DFOT optical upper limit
  41. GRB 240101C: Swift/BAT-GUANO detection of a short burst
  42. GRB 240102C: AstroSat CZTI detection
  43. GRB 240101C: AstroSat CZTI detection
  44. GRB 240102A: Swift/UVOT Upper Limits
  45. GRB 240102A: Enhanced Swift-XRT position
  46. GRB 240101B: Swift-XRT refined Analysis
  47. GRB 240102A: Swift-XRT refined Analysis
  48. GRB 240102A: LCOGT Optical Upper Limits
  49. GRB240102A: BOOTES-6/DPRT optical upper limit
  50. GRB 240102B: Fermi GBM Final Real-time Localization
  51. GRB 240101B: MarSEC Observatory, Vicenza, Italy, UPPER LIMIT
  52. GRB 240102A: Swift detection of a burst
  53. GRB 240101A: Terskol Zeiss-2000 optical observations
  54. GRB 240101C: GRBAlpha detection
  55. GRB 240101B: Swift/UVOT Upper Limits
  56. GRB 240101A: Swift/UVOT Upper Limits
  57. GRB 240101A: Swift-XRT refined Analysis
  58. GRB 240101B: Enhanced Swift-XRT position
  59. GRB 240101B: KAIT Optical Upper Limit
  60. GRB 240101A: KAIT Optical Upper Limit
  61. GRB 240101A: Enhanced Swift-XRT position
  62. GRB 240101C: Fermi GBM Final Localization
  63. GRB 240101B: Swift detection of a burst
  64. GRB 240101A: Swift detection of a burst
  65. GRB 231230A: Swift-XRT refined Analysis
  66. GRB 231230A: GOTO optical upper limits
  67. GRB 231230A: Enhanced Swift-XRT position
  68. GRB 231230A: Swift/UVOT Upper Limits
  69. GRB 231230A: NOT optical upper limits
  70. GRB 231230A: Prompt enhanced Swift-XRT position
  71. GRB 231230A: Swift detection of a burst
  72. GRB 231230A: Fermi GBM Final Real-time Localization
  73. GRB 231210B: BOOTES-7 optical upper limit
  74. IPN triangulation of GRB 231224A (short)
  75. GRB 231224A: Fermi GBM Final Real-time Localization
  76. GRB 231222B: GRBAlpha detection
  77. GRB 231222B: Swift-XRT afterglow detection
  78. GRB 231222B: Fermi GBM Detection
  79. GRB 231222B: Fermi-LAT detection
  80. GRB 231222A: Tiled Swift observations
  81. IceCube-231211A: GRANDMA observations of PKS2047+098
  82. GRID detection of GRB 231215A
  83. GRB 231222A: Fermi GBM Final Real-time Localization
  84. GRB 231220A: Swift-XRT follow-up observations
  85. GRB 231220A: Swift ToO observations
  86. GRB 231220A: Swift/BAT-GUANO arcminute localization of a long burst
  87. GRB 231220A: Fermi GBM Final Real-time Localization
  88. GRB 231210B: new optical transient detected with the Greenhill Observatory University of Tasmania within the BAT-Swift enhanced position
  89. GRB 231219A: Fermi GBM Final Real-time Localization
  90. GRID detection of GRB 231205B
  91. GRID detection of GRB 231205A
  92. GRB 231216A: GAD Observatory, La Spezia, Italy upper limit
  93. GRB 231216A: optical upper limits from the INAF Asiago Observatory
  94. GRB 231216A: 10.4 m GTC optical upper limit
  95. GRB 231215A: AMI-LA radio detection
  96. GRB 231216A: Nanshan/HMT optical upper limit
  97. GRB 231216A: LCOGT Optical Upper Limits
  98. GRB 231216A: Swift-XRT refined analysis correction
  99. GRB 231216A: Swift-XRT refined Analysis
  100. GRB 231216A: AST3-3 YaoAn Optical Upper Limit

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