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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 231214A: Fermi-LAT detection
  2. GRB 231214B: Swift/BAT-GUANO detection of a burst
  3. GRB231214A: BOOTES-6/DPRT optical upper limit
  4. Fermi trigger No 724278269: Global MASTER-Net observations report
  5. Fermi trigger No 724233240: Global MASTER-Net observations report
  6. GRB 231214A: Fermi GBM Final Real-time Localization
  7. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 2047+098, located inside the IceCube-231211A error region
  8. IceCube-231211A - IceCube observation of a high-energy neutrino candidate track-like event
  9. GRB 231212A: GECAM-C detection of a likely short burst
  10. Fermi trigger No 724035412: Global MASTER-Net observations report
  11. Fermi trigger No 723906955: Global MASTER-Net observations report
  12. IPN triangulation of GRB 231129C
  13. GRB 231210A: Fermi GBM Final Real-time Localization
  14. IPN triangulation of GRB 231205A
  15. GRB231115A: TURBO Pre-Burst Optical Upper Limits
  16. Fermi trigger No 723581802: Global MASTER-Net observations report
  17. GRB 231206B: Fermi GBM Final Real-time Localization
  18. Fermi-LAT gamma-ray observations of IceCube-231202A
  19. GRB 231129C: ASIM MXGS observation and localization
  20. GRB 231205A: DDOTI Upper Limits on the Afterglow
  21. GRB 231204A: Glowbug gamma-ray detection
  22. GRB 231204A: CALET Gamma-Ray Burst Monitor detection
  23. Fermi-LAT daily aperture light curve of T CrB now available
  24. GRB 231205A: joint location of multiple instruments by ETJASMIN
  25. GRB 231204A: AstroSat CZTI detection
  26. GRB 231205A: GECAM-B detection of a short burst
  27. Fermi trigger No 723435916: Global MASTER-Net observations report
  28. Fermi trigger No 723326169: Global MASTER-Net observations report
  29. GRB 231205A: Fermi GBM Final Real-time Localization
  30. Fermi trigger No 723412808: Global MASTER-Net observations report
  31. GRB 231203A: Fermi GBM Observation
  32. GRB 231204A: Fermi GBM Final Real-time Localization
  33. GRB 231203A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  34. Konus-Wind detection of GRB 231129C
  35. IceCube-231202A - IceCube observation of a high-energy neutrino candidate track-like event
  36. Fermi trigger No 723279695: Global MASTER-Net observations report
  37. The Fermi GBM team reports the detection of a likely SHORT GRB
  38. GRB 231203A: Fermi GBM Final Real-time Localization
  39. GRB 231129C: Swift-XRT afterglow detection
  40. Fermi trigger No 723149952: Global MASTER-Net observations report
  41. GRB 231128A: VZLUSAT-2 detection
  42. GRB 231129C: AGILE detection
  43. GRB 231129C: Swift/BAT-GUANO localization of a burst outside the coded FOV
  44. GRB 231129C: MASTER OT detection
  45. GRB 231129C: Fermi-LAT detection
  46. GRB 231129C: GRBAlpha detection
  47. GRB 231129C: Glowbug gamma-ray detection
  48. GRB 231129C: Swift-XRT observations
  49. GRB 231129C: GECAM-B detection of a bright burst
  50. GRB 231129C: AstroSat CZTI detection
  51. GRB 231129C: CALET Gamma-Ray Burst Monitor detection
  52. GRB 231129C: Fermi GBM Observation of a very bright GRB
  53. GRB 231129C: iTelescope likely optical afterglow AT 2023yph discovery
  54. GRB 231129C: Tiled Swift observations
  55. GRB 231129C: BALROG localization (Fermi Trigger / GRB 231129799)
  56. GRB 231129C: Fermi GBM detection of a very bright burst
  57. GRB 231129C: Fermi GBM Final Real-time Localization
  58. Fermi trigger No 722977823: Global MASTER-Net observations report
  59. Fermi-LAT gamma-ray observations of IceCube-231125A
  60. GRB 231128A: Fermi GBM Final Real-time Localization
  61. GRB 231123C: Fermi GBM Observation
  62. GRB 231123B: Fermi GBM Observation
  63. GRB 231123B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  64. GRB 231124A: GRBAlpha detection
  65. IceCube-231125A - IceCube observation of a high-energy neutrino candidate track-like event
  66. Fermi trigger No 722653947: Global MASTER-Net observations report
  67. GRB 231126A: Fermi GBM Final Real-time Localization
  68. GRB 231123C: Insight-HXMT/HE detection
  69. Fermi trigger No 722460326: Global MASTER-Net observations report
  70. Fermi trigger No 722507896: Global MASTER-Net observations report
  71. GRB 231123C (short): Glowbug gamma-ray detection
  72. GRB 231124A: Glowbug gamma-ray detection
  73. GRB 231123C: Swift/BAT-GUANO detection of a short burst likely outside the coded FOV
  74. Fermi trigger No 722462310: Global MASTER-Net observations report
  75. GRB 231124A: CALET Gamma-Ray Burst Monitor detection
  76. GRB 231115A: XMM-Newton observation
  77. GRB 231124A: Fermi GBM Final Real-time Localization
  78. GRB 231123A: AstroSat CZTI detection
  79. GRB 231123C: Fermi GBM Final Real-time Localization
  80. GRB 231123B: Fermi GBM Final Real-time Localization
  81. Fermi trigger No 722400249: Global MASTER-Net observations report
  82. GRB 231118A: REM optical afterglow detection
  83. GRB 231123A: Fermi GBM Final Real-time Localization
  84. GRB 231122B: Glowbug gamma-ray detection
  85. Fermi trigger No 722349867: Global MASTER-Net observations report
  86. GRB 231122A: GECAM detection
  87. GRB 231122B: GECAM detection
  88. GRB 231122A: Fermi GBM Final Real-time Localization
  89. GRB 231118A: ATCA detection of radio counterpart
  90. GRB 231118A: GRBAlpha detection
  91. GRB 231118A: VZLUSAT-2 detection
  92. Konus-Wind detection of GRB 231020A
  93. GRB 231118B: CALET Gamma-Ray Burst Monitor detection
  94. GRB 231118B: Fermi GBM observation
  95. GRB 231118A: Fermi GBM observation
  96. GRB 231120A: Fermi GBM Final Real-time Localization
  97. GRB 231118A: VLT/X-shooter redshift
  98. Fermi trigger No 722039659: Global MASTER-Net observations report
  99. GRB 231118A: AstroSat CZTI detection
  100. GRB 231115A: Upper limit from CALET Gamma-Ray Burst Monitor

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