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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"

36397 results found.

  1. GRB 240118A: Fermi-LAT detection
  2. GRID detection of GRB 231230A
  3. GRB 240118A: Fermi GBM Final Real-time Localization
  4. GRB 240115A: Swift/BAT-GUANO detection of a short burst
  5. IPN triangulation of GRB 240112A (long)
  6. GRB 240115B: AstroSat CZTI detection
  7. LIGO/Virgo/KAGRA S240109a: Upper limits from Swift/BAT-GUANO
  8. GRB 240115B: Fermi GBM Detection
  9. GRB 240112D: Glowbug gamma-ray detection
  10. GRB 240112C: Glowbug gamma-ray detection
  11. GRB 240112C: VZLUSAT-2 detection
  12. GRB 240107A: VZLUSAT-2 detection
  13. Fermi GRB 240115B: Global MASTER-Net observations report
  14. GRB 240115B: A long GRB detected by INTEGRAL
  15. GRB 240115B: Fermi GBM Final Real-time Localization
  16. Konus-Wind detection of GRB 240112C
  17. Fermi GRB 240115A: Global MASTER-Net observations report
  18. GRB 240115A: Fermi GBM Final Real-time Localization
  19. GRB 240112C: GRBAlpha detection
  20. GRB 240114A: MAXI/GSC detection
  21. GRB 240112C: Swift/UVOT Detection
  22. GRB 240112C: Fermi GBM Detection
  23. GRB 240112C: Swift-XRT refined Analysis
  24. GRB 240112C: SAO RAS optical observations
  25. GRB 240112E: Fermi GBM Final Localization
  26. Fermi GRB 240112D: Global MASTER-Net observations report
  27. GRB 240112D: Fermi GBM Final Real-time Localization
  28. Swift GRB 240112C: Global MASTER-Net observations report
  29. Fermi GRB 240112B: Global MASTER-Net observations report
  30. GRB 240109A: Swift-BAT refined analysis
  31. GRB 240112C: Swift detection of a burst with an optical counterpart
  32. GRB 240112B: Fermi GBM Final Real-time Localization
  33. GRB 240112A: GECAM detection of a burst
  34. GRB 240109A: Fermi GBM Observation
  35. GRB 240110A: AstroSat CZTI detection
  36. GRB 240108A: Glowbug gamma-ray detection
  37. GRB 231214A: ATCA Radio Upper Limits
  38. GRB 240106B: Glowbug gamma-ray detection
  39. GRB 240106A: Glowbug gamma-ray detection
  40. IceCube-240105A: Upper limits from a search for additional neutrino events in IceCube
  41. GRB 240109B: Fermi GBM Final Real-time Localization
  42. Konus-Wind detection of GRB 240101C
  43. GRB 231215A: radio detection with the VLA
  44. GRB 230818A: further radio observations with the VLA
  45. GRB 230812B: further radio observations with the VLA
  46. GRB 240107A: AstroSat CZTI detection
  47. GRB 240109A: Swift detection of a short burst
  48. LIGO/Virgo/KAGRA S240104bl: Upper limits from Swift/BAT-GUANO
  49. GRB 240106A: GRBAlpha detection
  50. GRB 240107A: MAXI/GSC detection
  51. GRB 240106B: Fermi GBM Final Real-time Localization
  52. GRB 240106A: Fermi GBM Final Real-time Localization
  53. IPN triangulation of GRB 240101C (short)
  54. GRB GRB240101C: Fermi GBM observation
  55. GRB 240101A: 1.3m DFOT optical observations
  56. GRB 240102A: 1.3m DFOT optical upper limit
  57. GRB 240101B: 1.3m DFOT optical upper limit
  58. GRB 240101C: Swift/BAT-GUANO detection of a short burst
  59. GRB 240102C: AstroSat CZTI detection
  60. GRB 240101C: AstroSat CZTI detection
  61. GRB 231220A: Swift-UVOT upper limit
  62. GRB 240102A: Swift-BAT refined analysis
  63. GRB 240102A: Swift/UVOT Upper Limits
  64. GRB 231230A: Swift-BAT refined analysis
  65. GRB 240101A: Swift-BAT refined analysis
  66. GRB 240101B: Swift-BAT refined analysis
  67. GRB 240102A: Enhanced Swift-XRT position
  68. GRB 240101B: Swift-XRT refined Analysis
  69. GRB 240102A: Swift-XRT refined Analysis
  70. GRB 240102B (Fermi GBM trigger 725926335/240102925) is not a GRB
  71. GRB 240102A: LCOGT Optical Upper Limits
  72. GRB240102A: BOOTES-6/DPRT optical upper limit
  73. GRB 240102B: Fermi GBM Final Real-time Localization
  74. GRB 240101B: MarSEC Observatory, Vicenza, Italy, UPPER LIMIT
  75. GRB 240102A: Swift detection of a burst
  76. GRB 240101A: Terskol Zeiss-2000 optical observations
  77. GRB 240101C: GRBAlpha detection
  78. GRB 240101B: Swift/UVOT Upper Limits
  79. GRB 240101A: Swift/UVOT Upper Limits
  80. GRB 240101A: Swift-XRT refined Analysis
  81. GRB 240101B: Enhanced Swift-XRT position
  82. GRB 240101B: KAIT Optical Upper Limit
  83. GRB 240101A: KAIT Optical Upper Limit
  84. GRB 240101A: Enhanced Swift-XRT position
  85. GRB 240101C: Fermi GBM Final Localization
  86. GRB 240101B: Swift detection of a burst
  87. GRB 240101A: Swift detection of a burst
  88. GRB231230A: Fermi GBM Observation
  89. GRB 231230A: Swift-XRT refined Analysis
  90. GRB 231230A: GOTO optical upper limits
  91. GRB 231230A: Enhanced Swift-XRT position
  92. GRB 231230A: Swift/UVOT Upper Limits
  93. GRB 231230A: NOT optical upper limits
  94. GRB 231230A: Prompt enhanced Swift-XRT position
  95. GRB 231230A: Swift detection of a burst
  96. GRB 231230A: Fermi GBM Final Real-time Localization
  97. GRB 231210B: BOOTES-7 optical upper limit
  98. LIGO/Virgo/KAGRA S231224e: Upper limits from Swift/BAT-GUANO
  99. IPN triangulation of GRB 231224A (short)
  100. GRB 231224A: Fermi GBM Final Real-time Localization

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