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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"

11620 results found.

  1. Konus-Wind detection of GRB 231215A
  2. GRB 231214A: Swift/UVOT Upper Limits
  3. GRB 231204A: VZLUSAT-2 detection
  4. GRB 231215A: Fermi GBM observation
  5. GRB 231215A: Swift/UVOT Detection
  6. GRB 231214A: Fermi GBM observation
  7. Fermi trigger No 724326442: Global MASTER-Net observations report
  8. GRB 231215A: AstroSat CZTI detection
  9. GRB 231214A: AstroSat CZTI detection
  10. GRB 231215B: Fermi GBM Final Real-time Localization
  11. GRB 231214A: Fermi-LAT detection
  12. GRB 231214B: Swift/BAT-GUANO detection of a burst
  13. GRB231214A: BOOTES-6/DPRT optical upper limit
  14. Fermi trigger No 724278269: Global MASTER-Net observations report
  15. Fermi trigger No 724233240: Global MASTER-Net observations report
  16. GRB 231214A: Fermi GBM Final Real-time Localization
  17. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 2047+098, located inside the IceCube-231211A error region
  18. IceCube-231211A - IceCube observation of a high-energy neutrino candidate track-like event
  19. GRB 231212A: GECAM-C detection of a likely short burst
  20. Fermi trigger No 724035412: Global MASTER-Net observations report
  21. Fermi trigger No 723906955: Global MASTER-Net observations report
  22. IPN triangulation of GRB 231129C
  23. GRB 231210A: Fermi GBM Final Real-time Localization
  24. IPN triangulation of GRB 231205A
  25. GRB231115A: TURBO Pre-Burst Optical Upper Limits
  26. Fermi trigger No 723581802: Global MASTER-Net observations report
  27. GRB 231206B: Fermi GBM Final Real-time Localization
  28. Fermi-LAT gamma-ray observations of IceCube-231202A
  29. GRB 231129C: ASIM MXGS observation and localization
  30. GRB 231205A: DDOTI Upper Limits on the Afterglow
  31. GRB 231204A: Glowbug gamma-ray detection
  32. GRB 231204A: CALET Gamma-Ray Burst Monitor detection
  33. Fermi-LAT daily aperture light curve of T CrB now available
  34. GRB 231205A: joint location of multiple instruments by ETJASMIN
  35. GRB 231204A: AstroSat CZTI detection
  36. GRB 231205A: GECAM-B detection of a short burst
  37. Fermi trigger No 723435916: Global MASTER-Net observations report
  38. Fermi trigger No 723326169: Global MASTER-Net observations report
  39. GRB 231205A: Fermi GBM Final Real-time Localization
  40. Fermi trigger No 723412808: Global MASTER-Net observations report
  41. GRB 231203A: Fermi GBM Observation
  42. GRB 231204A: Fermi GBM Final Real-time Localization
  43. GRB 231203A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  44. Konus-Wind detection of GRB 231129C
  45. IceCube-231202A - IceCube observation of a high-energy neutrino candidate track-like event
  46. Fermi trigger No 723279695: Global MASTER-Net observations report
  47. The Fermi GBM team reports the detection of a likely SHORT GRB
  48. GRB 231203A: Fermi GBM Final Real-time Localization
  49. GRB 231129C: Swift-XRT afterglow detection
  50. Fermi trigger No 723149952: Global MASTER-Net observations report
  51. GRB 231128A: VZLUSAT-2 detection
  52. GRB 231129C: AGILE detection
  53. GRB 231129C: Swift/BAT-GUANO localization of a burst outside the coded FOV
  54. GRB 231129C: MASTER OT detection
  55. GRB 231129C: Fermi-LAT detection
  56. GRB 231129C: GRBAlpha detection
  57. GRB 231129C: Glowbug gamma-ray detection
  58. GRB 231129C: Swift-XRT observations
  59. GRB 231129C: GECAM-B detection of a bright burst
  60. GRB 231129C: AstroSat CZTI detection
  61. GRB 231129C: CALET Gamma-Ray Burst Monitor detection
  62. GRB 231129C: Fermi GBM Observation of a very bright GRB
  63. GRB 231129C: iTelescope likely optical afterglow AT 2023yph discovery
  64. GRB 231129C: Tiled Swift observations
  65. GRB 231129C: BALROG localization (Fermi Trigger / GRB 231129799)
  66. GRB 231129C: Fermi GBM detection of a very bright burst
  67. GRB 231129C: Fermi GBM Final Real-time Localization
  68. Fermi trigger No 722977823: Global MASTER-Net observations report
  69. Fermi-LAT gamma-ray observations of IceCube-231125A
  70. GRB 231128A: Fermi GBM Final Real-time Localization
  71. GRB 231123C: Fermi GBM Observation
  72. GRB 231123B: Fermi GBM Observation
  73. GRB 231123B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  74. GRB 231124A: GRBAlpha detection
  75. IceCube-231125A - IceCube observation of a high-energy neutrino candidate track-like event
  76. Fermi trigger No 722653947: Global MASTER-Net observations report
  77. GRB 231126A: Fermi GBM Final Real-time Localization
  78. GRB 231123C: Insight-HXMT/HE detection
  79. Fermi trigger No 722460326: Global MASTER-Net observations report
  80. Fermi trigger No 722507896: Global MASTER-Net observations report
  81. GRB 231123C (short): Glowbug gamma-ray detection
  82. GRB 231124A: Glowbug gamma-ray detection
  83. GRB 231123C: Swift/BAT-GUANO detection of a short burst likely outside the coded FOV
  84. Fermi trigger No 722462310: Global MASTER-Net observations report
  85. GRB 231124A: CALET Gamma-Ray Burst Monitor detection
  86. GRB 231115A: XMM-Newton observation
  87. GRB 231124A: Fermi GBM Final Real-time Localization
  88. GRB 231123A: AstroSat CZTI detection
  89. GRB 231123C: Fermi GBM Final Real-time Localization
  90. GRB 231123B: Fermi GBM Final Real-time Localization
  91. Fermi trigger No 722400249: Global MASTER-Net observations report
  92. GRB 231118A: REM optical afterglow detection
  93. GRB 231123A: Fermi GBM Final Real-time Localization
  94. GRB 231122B: Glowbug gamma-ray detection
  95. Fermi trigger No 722349867: Global MASTER-Net observations report
  96. GRB 231122A: GECAM detection
  97. GRB 231122B: GECAM detection
  98. GRB 231122A: Fermi GBM Final Real-time Localization
  99. GRB 231118A: ATCA detection of radio counterpart
  100. GRB 231118A: GRBAlpha detection

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