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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"

11610 results found.

  1. GRB 240115A: Fermi GBM Observation
  2. GRB 240118C: Fermi GBM Final Localization
  3. GRB 240118A: Swift ToO observations
  4. GRB 240118A: AbAO optical upper limit
  5. Fermi GRB 240118B: Global MASTER-Net observations report
  6. GRB 240118A: NuSTAR Offline Analysis of the GRB
  7. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  8. Konus-Wind detection of GRB 240118A
  9. GRB 240118C: BALROG localization (Fermi Trigger 727291408 / GRB 240118725)
  10. GRB 240118A: NuSTAR Detection of a Long GRB
  11. GRB 240118A: Fermi GBM Observation
  12. GRB 240118B: Fermi GBM Final Real-time Localization
  13. GRB 240118A: Fermi-LAT detection
  14. GRID detection of GRB 231230A
  15. GRB 240118A: Fermi GBM Final Real-time Localization
  16. GRB 240115A: Swift/BAT-GUANO detection of a short burst
  17. GRB 240115B: AstroSat CZTI detection
  18. GRB 240115B: Fermi GBM Detection
  19. GRB 240112D: Glowbug gamma-ray detection
  20. GRB 240112C: Glowbug gamma-ray detection
  21. GRB 240112C: VZLUSAT-2 detection
  22. GRB 240107A: VZLUSAT-2 detection
  23. Fermi GRB 240115B: Global MASTER-Net observations report
  24. GRB 240115B: A long GRB detected by INTEGRAL
  25. GRB 240115B: Fermi GBM Final Real-time Localization
  26. Konus-Wind detection of GRB 240112C
  27. Fermi GRB 240115A: Global MASTER-Net observations report
  28. GRB 240115A: Fermi GBM Final Real-time Localization
  29. GRB 240112C: GRBAlpha detection
  30. GRB 240112C: Fermi GBM Detection
  31. Fermi trigger No 726773850: Global MASTER-Net observations report
  32. GRB 240112E: Fermi GBM Final Localization
  33. Fermi GRB 240112D: Global MASTER-Net observations report
  34. GRB 240112D: Fermi GBM Final Real-time Localization
  35. Fermi trigger No 726774492: Global MASTER-Net observations report
  36. Fermi GRB 240112B: Global MASTER-Net observations report
  37. GRB 240112B: Fermi GBM Final Real-time Localization
  38. GRB 240109A: Fermi GBM Observation
  39. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 0446+11, located inside the IceCube-240105A error region
  40. GRB 231214A: ATCA Radio Upper Limits
  41. GRB 240106B: Glowbug gamma-ray detection
  42. GRB 240106A: Glowbug gamma-ray detection
  43. GRB 240109B: Fermi GBM Final Real-time Localization
  44. Konus-Wind detection of GRB 240101C
  45. GRB 231215A: radio detection with the VLA
  46. GRB 230818A: further radio observations with the VLA
  47. GRB 230812B: further radio observations with the VLA
  48. Update of IceCube-240105A - Corrected errors
  49. GRB 240106A: GRBAlpha detection
  50. Fermi trigger No 726347794: Global MASTER-Net observations report
  51. GRB 240106B: Fermi GBM Final Real-time Localization
  52. Fermi trigger No 726194053: Global MASTER-Net observations report
  53. GRB 240106A: Fermi GBM Final Real-time Localization
  54. IPN triangulation of GRB 240101C (short)
  55. GRB GRB240101C: Fermi GBM observation
  56. IceCube-240105A - IceCube observation of a high-energy neutrino candidate track-like event
  57. GRB 240101C: Swift/BAT-GUANO detection of a short burst
  58. GRB 240102C: AstroSat CZTI detection
  59. GRB 240101C: AstroSat CZTI detection
  60. GRB 231220A: Swift-UVOT upper limit
  61. GRB 240102B (Fermi GBM trigger 725926335/240102925) is not a GRB
  62. Fermi trigger No 725857207: Global MASTER-Net observations report
  63. GRB 240102B: Fermi GBM Final Real-time Localization
  64. GRB 240101C: GRBAlpha detection
  65. GRB 240101C: Fermi GBM Final Localization
  66. Fermi trigger No 725806648: Global MASTER-Net observations report
  67. GRB231230A: Fermi GBM Observation
  68. GRB 231230A: GOTO optical upper limits
  69. Fermi trigger No 725592555: Global MASTER-Net observations report
  70. GRB 231230A: Fermi GBM Final Real-time Localization
  71. IPN triangulation of GRB 231224A (short)
  72. Fermi trigger No 725143760: Global MASTER-Net observations report
  73. GRB 231224A: Fermi GBM Final Real-time Localization
  74. GRB 231222B: GRBAlpha detection
  75. GRB 231222B: Swift-XRT afterglow detection
  76. Fermi trigger No 724921799: Global MASTER-Net observations report
  77. GRB 231222B: Fermi GBM Detection
  78. GRB 231222B: Fermi-LAT detection
  79. GRB 231222A: Tiled Swift observations
  80. IceCube-231211A: GRANDMA observations of PKS2047+098
  81. GRID detection of GRB 231215A
  82. GRB 231222A: Fermi GBM Final Real-time Localization
  83. GRB 231220A: Swift/BAT-GUANO arcminute localization of a long burst
  84. Fermi trigger No 724781422: Global MASTER-Net observations report
  85. GRB 231220A: Fermi GBM Final Real-time Localization
  86. Fermi trigger No 724698747: Global MASTER-Net observations report
  87. GRB 231219A: Fermi GBM Final Real-time Localization
  88. GRID detection of GRB 231205A
  89. GRB 231214B: Fermi GBM observation
  90. GRB 231215A: GRBAlpha detection
  91. Konus-Wind detection of GRB 231215A
  92. GRB 231214A: Swift/UVOT Upper Limits
  93. GRB 231204A: VZLUSAT-2 detection
  94. GRB 231215A: Fermi GBM observation
  95. GRB 231215A: Swift/UVOT Detection
  96. GRB 231214A: Fermi GBM observation
  97. Fermi trigger No 724326442: Global MASTER-Net observations report
  98. GRB 231215A: AstroSat CZTI detection
  99. GRB 231214A: AstroSat CZTI detection
  100. GRB 231215B: Fermi GBM Final Real-time Localization

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