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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"

11627 results found.

  1. GRB 240124A?: BALROG localization (Fermi Trigger 727752941 / GRB 240124066)
  2. Fermi GRB 240123B: Global MASTER-Net observations report
  3. Fermi GBM Sub-Threshold Detection of GRB 240123A
  4. GRB 240123B: Fermi GBM Final Real-time Localization
  5. IceCube-240123A - IceCube observation of a high-energy neutrino candidate track-like event
  6. Konus-Wind detection of GRB 240119A (short/hard)
  7. IPN triangulation of GRB 240119A (short)
  8. GRB 240119A: GECAM detection of a short burst
  9. GRB 240118C: GECAM-B detection of a long burst
  10. GRB 240119A: AstroSat CZTI detection of a short burst
  11. GRB 240118A: Mondy optical observations
  12. GRB 240118A: Swift-XRT afterglow detection
  13. GRB 240118C: Fermi GBM Observation
  14. Fermi GRB 240119A: Global MASTER-Net observations report
  15. GRB 240119A: Fermi GBM Final Localization
  16. GRB 240118C: Swift/BAT-GUANO detection of a burst
  17. GRB 240118A: GRBAlpha detection
  18. GRB 240115A: Fermi GBM Observation
  19. GRB 240118C: Fermi GBM Final Localization
  20. GRB 240118A: Swift ToO observations
  21. GRB 240118A: AbAO optical upper limit
  22. Fermi GRB 240118B: Global MASTER-Net observations report
  23. GRB 240118A: NuSTAR Offline Analysis of the GRB
  24. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  25. Konus-Wind detection of GRB 240118A
  26. GRB 240118C: BALROG localization (Fermi Trigger 727291408 / GRB 240118725)
  27. GRB 240118A: NuSTAR Detection of a Long GRB
  28. GRB 240118A: Fermi GBM Observation
  29. GRB 240118B: Fermi GBM Final Real-time Localization
  30. GRB 240118A: Fermi-LAT detection
  31. GRID detection of GRB 231230A
  32. GRB 240118A: Fermi GBM Final Real-time Localization
  33. GRB 240115A: Swift/BAT-GUANO detection of a short burst
  34. GRB 240115B: AstroSat CZTI detection
  35. GRB 240115B: Fermi GBM Detection
  36. GRB 240112D: Glowbug gamma-ray detection
  37. GRB 240112C: Glowbug gamma-ray detection
  38. GRB 240112C: VZLUSAT-2 detection
  39. GRB 240107A: VZLUSAT-2 detection
  40. Fermi GRB 240115B: Global MASTER-Net observations report
  41. GRB 240115B: A long GRB detected by INTEGRAL
  42. GRB 240115B: Fermi GBM Final Real-time Localization
  43. Konus-Wind detection of GRB 240112C
  44. Fermi GRB 240115A: Global MASTER-Net observations report
  45. GRB 240115A: Fermi GBM Final Real-time Localization
  46. GRB 240112C: GRBAlpha detection
  47. GRB 240112C: Fermi GBM Detection
  48. Fermi trigger No 726773850: Global MASTER-Net observations report
  49. GRB 240112E: Fermi GBM Final Localization
  50. Fermi GRB 240112D: Global MASTER-Net observations report
  51. GRB 240112D: Fermi GBM Final Real-time Localization
  52. Fermi trigger No 726774492: Global MASTER-Net observations report
  53. Fermi GRB 240112B: Global MASTER-Net observations report
  54. GRB 240112B: Fermi GBM Final Real-time Localization
  55. GRB 240109A: Fermi GBM Observation
  56. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 0446+11, located inside the IceCube-240105A error region
  57. GRB 231214A: ATCA Radio Upper Limits
  58. GRB 240106B: Glowbug gamma-ray detection
  59. GRB 240106A: Glowbug gamma-ray detection
  60. GRB 240109B: Fermi GBM Final Real-time Localization
  61. Konus-Wind detection of GRB 240101C
  62. GRB 231215A: radio detection with the VLA
  63. GRB 230818A: further radio observations with the VLA
  64. GRB 230812B: further radio observations with the VLA
  65. Update of IceCube-240105A - Corrected errors
  66. GRB 240106A: GRBAlpha detection
  67. Fermi trigger No 726347794: Global MASTER-Net observations report
  68. GRB 240106B: Fermi GBM Final Real-time Localization
  69. Fermi trigger No 726194053: Global MASTER-Net observations report
  70. GRB 240106A: Fermi GBM Final Real-time Localization
  71. IPN triangulation of GRB 240101C (short)
  72. GRB GRB240101C: Fermi GBM observation
  73. IceCube-240105A - IceCube observation of a high-energy neutrino candidate track-like event
  74. GRB 240101C: Swift/BAT-GUANO detection of a short burst
  75. GRB 240102C: AstroSat CZTI detection
  76. GRB 240101C: AstroSat CZTI detection
  77. GRB 231220A: Swift-UVOT upper limit
  78. GRB 240102B (Fermi GBM trigger 725926335/240102925) is not a GRB
  79. Fermi trigger No 725857207: Global MASTER-Net observations report
  80. GRB 240102B: Fermi GBM Final Real-time Localization
  81. GRB 240101C: GRBAlpha detection
  82. GRB 240101C: Fermi GBM Final Localization
  83. Fermi trigger No 725806648: Global MASTER-Net observations report
  84. GRB231230A: Fermi GBM Observation
  85. GRB 231230A: GOTO optical upper limits
  86. Fermi trigger No 725592555: Global MASTER-Net observations report
  87. GRB 231230A: Fermi GBM Final Real-time Localization
  88. IPN triangulation of GRB 231224A (short)
  89. Fermi trigger No 725143760: Global MASTER-Net observations report
  90. GRB 231224A: Fermi GBM Final Real-time Localization
  91. GRB 231222B: GRBAlpha detection
  92. GRB 231222B: Swift-XRT afterglow detection
  93. Fermi trigger No 724921799: Global MASTER-Net observations report
  94. GRB 231222B: Fermi GBM Detection
  95. GRB 231222B: Fermi-LAT detection
  96. GRB 231222A: Tiled Swift observations
  97. IceCube-231211A: GRANDMA observations of PKS2047+098
  98. GRID detection of GRB 231215A
  99. GRB 231222A: Fermi GBM Final Real-time Localization
  100. GRB 231220A: Swift/BAT-GUANO arcminute localization of a long burst

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