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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"

14934 results found.

  1. GRB 230917A: AstroSat CZTI detection
  2. GRB 230915B: Glowbug gamma-ray detection
  3. LIGO/Virgo/KAGRA S230904n: Correction of the coordinates of the ZTF candidate counterpart
  4. GRB 230915A: Swift/BAT-GUANO detection of a burst
  5. GRB 230911D: GRBAlpha detection
  6. GRB 230911A: Swift-XRT afterglow detection
  7. GRB 230913A: CALET Gamma-Ray Burst Monitor detection
  8. GRB 230913A: Glowbug gamma-ray detection
  9. IceCube-230914A - IceCube observation of a high-energy neutrino candidate track-like event
  10. LIGO/Virgo/KAGRA S230904n: One ZTF candidate counterpart to coincident neutrino event
  11. GRB 230913A: Fermi GBM Final Real-time Localization
  12. GRB 230908A: CALET Gamma-Ray Burst Monitor detection
  13. GRB 230911D: NuSTAR Detection of Prompt Emission
  14. GRB 230911B: AstroSat CZTI detection
  15. GRB230911C: BOOTES-6/DPRT optical upper limit
  16. GRB 230906A: Chandra detection of the X-ray afterglow
  17. IPN triangulation of GRB 230911D (long)
  18. GRB 230911D: Fermi-LAT detection
  19. GRB 230911B: GRBAlpha and VZLUSAT-2 joint detection
  20. GRB 230908A: Swift/BAT-GUANO detection of a long burst outside the coded FOV
  21. GRB 230911B: correction to the KW GCN 34659
  22. Konus-Wind detection of GRB 230811D
  23. GRB 230911D: Fermi GBM Final Localization
  24. GRB 230911C: Swift detection of a burst
  25. GRB 230911B: Fermi GBM Final Real-time Localization
  26. GRB 230911A: Fermi GBM Final Real-time Localization
  27. GRB 230906A: AstroSat CZTI detection
  28. GRB 230910A: Fermi GBM Final Real-time Localization
  29. GRB 230908A: GRBAlpha detection
  30. GRB 230908A: AstroSat CZTI detection
  31. Glowbug gamma-ray detection GRB 230905B
  32. GRB 230906A: Swift/UVOT Upper Limits
  33. GRID detection of GRB 230827A
  34. Konus-Wind detection of GRB 230906A (short)
  35. IPN triangulation of GRB 230906A (short)
  36. GRB 230905B: AstroSat CZTI detection
  37. GRB 230812B: Chandra late-time detection of the X-ray afterglow
  38. GRB 230906A: Fermi GBM Final Localizationn
  39. GRB 230905B: GECAM-C detection of a long burst
  40. GRB 230905A: Fermi GBM Final Real-time Localization
  41. GRB 230903A: VLT/X-shooter optical observations
  42. GRB 230904C: Fermi GBM Final Localization
  43. GRB 230903A: Fermi GBM detection
  44. GRB 230904A: Fermi GBM Final Real-time Localization
  45. GRB 230903A: Swift detection of a burst
  46. GRB 230903A: Fermi GBM Final Real-time Localization
  47. GRB 230827B: Glowbug gamma-ray detection
  48. GRB 230827A: Glowbug gamma-ray detection
  49. GRB 230826A: Glowbug gamma-ray detection
  50. GRB 230827B: Swift-XRT afterglow detection
  51. LIGO/Virgo/KAGRA S230830b: Retraction of GW compact binary merger candidate
  52. GRB 230812B: Spectroscopic detection of the associated SN 2023pel.
  53. GRB 230827B: CALET Gamma-Ray Burst Monitor detection
  54. GRB 230828A: AstroSat CZTI detection
  55. GRB 230828A: GRBAlpha detection
  56. GRB 230827A: VZLUSAT-2 detection
  57. GRB 230827A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  58. GRB 230826A: VZLUSAT-2 detection
  59. GRB 230827B: VZLUSAT-2 detection
  60. GRB 230827A: GRBAlpha detection
  61. GRB 230827A: Fermi GBM Final Real-time Localization
  62. AT 2023qxj: ZTF discovery of the likely afterglow of Fermi GRB 230827256
  63. GRB 230826A: GRBAlpha detection
  64. GRB 230826A: Swift detection of a burst
  65. GRB 230826A: Fermi GBM Final Real-time Localization
  66. GRB 230818B: CALET Gamma-Ray Burst Monitor detection
  67. Trigger 1187225: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  68. Trigger 1187207: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  69. Trigger 1187203: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  70. GRB 230812B: radio detection with the VLA
  71. NICER detection of Swift J1727.8-1613 (GRB 230824A)
  72. Trigger 1187142: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  73. MAXI/GSC detection of Swift J1727.8-1613 (GRB 230824A)
  74. Trigger 1186982: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  75. GRB 230824B: AstroSat CZTI detection
  76. GRB 230824A: Swift detection of a burst
  77. GRB 230822A: Swift/BAT-GUANO detection of a burst
  78. IceCube-230823A - IceCube observation of a high-energy neutrino candidate track-like event
  79. GRB 230812B: AstroSat LAXPC detection
  80. GRB 230818B: VZLUSAT-2 detection
  81. GRB 230818B: AstroSat CZTI detection
  82. GRID detection of GRB 230818A
  83. GRB 230822A: Fermi GBM Final Real-time Localization
  84. GRB 230815A: ATCA detection of radio counterpart
  85. GRB 20230818A: GIT optical upper limit
  86. Konus-Wind detection of GRB 230818A
  87. GRB 230812B : GRANDMA/Kilonova-Catcher optical afterglow detection and upper limits
  88. GRB 230820A: AstroSat CZTI detection
  89. GRB 230818A: AstroSat CZTI detection
  90. GRB 230818A: Swift/UVOT Detection
  91. GRB 230818A: GOTO optical afterglow detection
  92. GRB 230818A: Swift detection of a burst
  93. GRB 230818A: Fermi GBM Final Real-time Localization
  94. Swift GRB230818.98: Global MASTER-Net OT detection
  95. GRB 230816A: SVOM/C-GFT optical detection
  96. GRB 230817A: AstroSat CZTI detection
  97. GRB 230812B: NOEMA detection
  98. GRB 230815A: VLT/HAWK-I near-infrared afterglow detection
  99. GRB 230817A: Fermi GBM Final Real-time Localization
  100. GRB 230812B: optical photometry from Konkoly

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