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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"

11632 results found.

  1. GRB 231222A: Tiled Swift observations
  2. IceCube-231211A: GRANDMA observations of PKS2047+098
  3. GRID detection of GRB 231215A
  4. GRB 231222A: Fermi GBM Final Real-time Localization
  5. GRB 231220A: Swift/BAT-GUANO arcminute localization of a long burst
  6. Fermi trigger No 724781422: Global MASTER-Net observations report
  7. GRB 231220A: Fermi GBM Final Real-time Localization
  8. Fermi trigger No 724698747: Global MASTER-Net observations report
  9. GRB 231219A: Fermi GBM Final Real-time Localization
  10. GRID detection of GRB 231205A
  11. GRB 231214B: Fermi GBM observation
  12. GRB 231215A: GRBAlpha detection
  13. Konus-Wind detection of GRB 231215A
  14. GRB 231214A: Swift/UVOT Upper Limits
  15. GRB 231204A: VZLUSAT-2 detection
  16. GRB 231215A: Fermi GBM observation
  17. GRB 231215A: Swift/UVOT Detection
  18. GRB 231214A: Fermi GBM observation
  19. Fermi trigger No 724326442: Global MASTER-Net observations report
  20. GRB 231215A: AstroSat CZTI detection
  21. GRB 231214A: AstroSat CZTI detection
  22. GRB 231215B: Fermi GBM Final Real-time Localization
  23. GRB 231214A: Fermi-LAT detection
  24. GRB 231214B: Swift/BAT-GUANO detection of a burst
  25. GRB231214A: BOOTES-6/DPRT optical upper limit
  26. Fermi trigger No 724278269: Global MASTER-Net observations report
  27. Fermi trigger No 724233240: Global MASTER-Net observations report
  28. GRB 231214A: Fermi GBM Final Real-time Localization
  29. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 2047+098, located inside the IceCube-231211A error region
  30. IceCube-231211A - IceCube observation of a high-energy neutrino candidate track-like event
  31. GRB 231212A: GECAM-C detection of a likely short burst
  32. Fermi trigger No 724035412: Global MASTER-Net observations report
  33. Fermi trigger No 723906955: Global MASTER-Net observations report
  34. IPN triangulation of GRB 231129C
  35. GRB 231210A: Fermi GBM Final Real-time Localization
  36. IPN triangulation of GRB 231205A
  37. GRB231115A: TURBO Pre-Burst Optical Upper Limits
  38. Fermi trigger No 723581802: Global MASTER-Net observations report
  39. GRB 231206B: Fermi GBM Final Real-time Localization
  40. Fermi-LAT gamma-ray observations of IceCube-231202A
  41. GRB 231129C: ASIM MXGS observation and localization
  42. GRB 231205A: DDOTI Upper Limits on the Afterglow
  43. GRB 231204A: Glowbug gamma-ray detection
  44. GRB 231204A: CALET Gamma-Ray Burst Monitor detection
  45. Fermi-LAT daily aperture light curve of T CrB now available
  46. GRB 231205A: joint location of multiple instruments by ETJASMIN
  47. GRB 231204A: AstroSat CZTI detection
  48. GRB 231205A: GECAM-B detection of a short burst
  49. Fermi trigger No 723435916: Global MASTER-Net observations report
  50. Fermi trigger No 723326169: Global MASTER-Net observations report
  51. GRB 231205A: Fermi GBM Final Real-time Localization
  52. Fermi trigger No 723412808: Global MASTER-Net observations report
  53. GRB 231203A: Fermi GBM Observation
  54. GRB 231204A: Fermi GBM Final Real-time Localization
  55. GRB 231203A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  56. Konus-Wind detection of GRB 231129C
  57. IceCube-231202A - IceCube observation of a high-energy neutrino candidate track-like event
  58. Fermi trigger No 723279695: Global MASTER-Net observations report
  59. The Fermi GBM team reports the detection of a likely SHORT GRB
  60. GRB 231203A: Fermi GBM Final Real-time Localization
  61. GRB 231129C: Swift-XRT afterglow detection
  62. Fermi trigger No 723149952: Global MASTER-Net observations report
  63. GRB 231128A: VZLUSAT-2 detection
  64. GRB 231129C: AGILE detection
  65. GRB 231129C: Swift/BAT-GUANO localization of a burst outside the coded FOV
  66. GRB 231129C: MASTER OT detection
  67. GRB 231129C: Fermi-LAT detection
  68. GRB 231129C: GRBAlpha detection
  69. GRB 231129C: Glowbug gamma-ray detection
  70. GRB 231129C: Swift-XRT observations
  71. GRB 231129C: GECAM-B detection of a bright burst
  72. GRB 231129C: AstroSat CZTI detection
  73. GRB 231129C: CALET Gamma-Ray Burst Monitor detection
  74. GRB 231129C: Fermi GBM Observation of a very bright GRB
  75. GRB 231129C: iTelescope likely optical afterglow AT 2023yph discovery
  76. GRB 231129C: Tiled Swift observations
  77. GRB 231129C: BALROG localization (Fermi Trigger / GRB 231129799)
  78. GRB 231129C: Fermi GBM detection of a very bright burst
  79. GRB 231129C: Fermi GBM Final Real-time Localization
  80. Fermi trigger No 722977823: Global MASTER-Net observations report
  81. Fermi-LAT gamma-ray observations of IceCube-231125A
  82. GRB 231128A: Fermi GBM Final Real-time Localization
  83. GRB 231123C: Fermi GBM Observation
  84. GRB 231123B: Fermi GBM Observation
  85. GRB 231123B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  86. GRB 231124A: GRBAlpha detection
  87. IceCube-231125A - IceCube observation of a high-energy neutrino candidate track-like event
  88. Fermi trigger No 722653947: Global MASTER-Net observations report
  89. GRB 231126A: Fermi GBM Final Real-time Localization
  90. GRB 231123C: Insight-HXMT/HE detection
  91. Fermi trigger No 722460326: Global MASTER-Net observations report
  92. Fermi trigger No 722507896: Global MASTER-Net observations report
  93. GRB 231123C (short): Glowbug gamma-ray detection
  94. GRB 231124A: Glowbug gamma-ray detection
  95. GRB 231123C: Swift/BAT-GUANO detection of a short burst likely outside the coded FOV
  96. Fermi trigger No 722462310: Global MASTER-Net observations report
  97. GRB 231124A: CALET Gamma-Ray Burst Monitor detection
  98. GRB 231115A: XMM-Newton observation
  99. GRB 231124A: Fermi GBM Final Real-time Localization
  100. GRB 231123A: AstroSat CZTI detection

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