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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"

11622 results found.

  1. Fermi trigger No 627438255: Global MASTER-Net observations report
  2. Konus-Wind detection of GRB 201116A
  3. Fermi-LAT Gamma-ray Observations of IceCube-201114A
  4. GRB 201116A: NOT optical observations
  5. GRB 201116A: Swift-XRT afterglow detection
  6. GRB 201116A: OSN Afterglow Candidate
  7. Fermi trigger No 627198169: Global MASTER-Net observations report
  8. IceCube-201114A: No significant detection in HAWC
  9. GRB 201116A: Fermi-LAT detection
  10. GRB 201116A: Tiled Swift observations
  11. Fermi-LAT Gamma-ray Observations of IceCube-201115A
  12. GRB 201116A: BALROG localization (Fermi Trigger 627180592 / GRB 201116035)
  13. GRB 201116A: Fermi GBM Final Real-time Localization
  14. IceCube-201115A: not observable by Fermi-GBM
  15. Swift XRT observations of the Fermi-LAT source 4FGL J0658.6+0636, positionally consistent with the IceCube high-energy neutrino alert
  16. IceCube-201114A: Upper limits from Fermi GBM Observations
  17. IceCube-201115A: IceCube observation of a high-energy neutrino candidate event
  18. IceCube-201114A - IceCube observation of a high-energy neutrino candidate event
  19. Fermi-LAT Gamma-ray Observations of NuEm-201107A
  20. Fermi GRB 201111A: Global MASTER-Net observations report
  21. Konus-Wind observation of GRB 201109A
  22. GRB 201111A: Fermi GBM Final Real-time Localization
  23. IPN triangulation of GRB 201109A (short)
  24. GRB 201109A: Fermi GBM detection
  25. GRB 201104A: AstroSat CZTI detection
  26. Fermi GRB 201109A: Global MASTER-Net observations report
  27. GRB 201109A: Fermi GBM Final Real-time Localization
  28. Fermi GRB 201108A: Global MASTER-Net observations report
  29. GRB 201108A: Fermi GBM Final Real-time Localization
  30. Konus-Wind detection of GRB 201105A
  31. GRB 201104A: Swift-XRT observations
  32. Correction to GCN 28843: GBM report of GRB 201105B should have been GRB 201105A
  33. Fermi trigger No 626247072: Global MASTER-Net observations report
  34. GRB 201105B: Fermi GBM observation
  35. GRB 201105A: BALROG localization (Fermi Trigger 626247072 / GRB 201105230)
  36. GRB 201104A: BALROG localization (Fermi Trigger 626140861 / GRB 201104001)
  37. GRB 201104C: Fermi GBM Final Real-time Localization
  38. GRB 201104A: Tiled Swift observations
  39. GRB 201104A: Fermi GBM observation
  40. GRB 201104A: AGILE/MCAL detection
  41. GRB 201104A: Fermi-LAT detection
  42. Fermi GRB 201104A: Global MASTER-Net observations report
  43. GRB 201104A: Fermi GBM Final Real-time Localization
  44. Fermi GRB 201103A: Global MASTER-Net observations report
  45. GRB 201103A: Fermi GBM Final Real-time Localization
  46. Fermi GRB 201031B: Global MASTER-Net observations report
  47. GRB 201031B: BALROG localization (Fermi Trigger 625859489 / GRB 201031744)
  48. GRB 201031B: Fermi GBM Final Real-time Localization
  49. IceCube 201021A: Swift follow-up of Fermi J1725.5+1312
  50. GRB 201029A: Fermi GBM detection
  51. Fermi trigger No 625695596: Global MASTER-Net observations report
  52. GRB 201026A: Fermi GBM detection
  53. GRB 201020B: 1.3m DFOT continued optical follow-up observations
  54. GRB 201020B: HCT and GIT continued optical follow-up observations
  55. GRB 201020B: follow-up observations with Savelli Telescope
  56. GRB 201020B: 1.3m DFOT optical observations
  57. GRB 201020B: follow-up observations at Konkoly
  58. GRB 201020B: continued Mondy optical observations
  59. GRB 201020B: Redshift from GTC/OSIRIS
  60. IceCube-201021A: Optical counterpart of WISEA J172314.13+142101.5
  61. GRB 201020B: GROWTH-India Telescope optical observations
  62. Fermi-LAT Gamma-ray Observations of IceCube-201021A and detection of a new gamma-ray source, Fermi J1725.5+1312
  63. GRB 201020B: Konkoly Obs. optical detection
  64. GRB 201021C: Fermi GBM detection
  65. Konus-Wind detection of GRB 201020A
  66. GRB 201020B: Swift/UVOT Detection
  67. GRB 201020B: Swift-XRT afterglow detection
  68. IceCube-201021A: Upper limits from Fermi-GBM Observations
  69. HAWC-201019A: not observable by Fermi-GBM
  70. GRB 201020B: Mondy optical observations
  71. Konus-Wind detection of GRB 201020B
  72. GRB 201020B: Swift ToO observations
  73. GRB 201020B: Nanshan/NEXT optical afterglow confirmation
  74. GRB 201020B: MASTER bright optical afterglow detection
  75. GRB 201020B: Fermi-LAT detection
  76. IceCube-201021A: IceCube observation of a high-energy neutrino candidate event
  77. GRB 201020B: AGILE detection
  78. GRB 201021A: Fermi GBM Final Real-time Localization
  79. GRB 201020B: Fermi GBM detection
  80. GRB 201020A: Fermi GBM observation
  81. Fermi GRB 201020B: Global MASTER-Net observations report
  82. GRB 201020B: Fermi GBM Final Real-time Localization
  83. GRB 201019B: AstroSat CZTI detection
  84. GRB 201016A: Insight-HXMT/HE detection
  85. GRB 201017A: SAO RAS optical observations
  86. GRB 201017A: GROWTH-India optical upper limit
  87. GRB 201019B: Fermi GBM correction to GCN 28687
  88. GRB 201019A: Fermi GBM Final Real-time Localization
  89. GRB 201017A: MITSuME Akeno optical upper limits
  90. GRB 201019A: Fermi GBM Final Real-time Localization
  91. GRB 201017A: Assy and Mondy optical observations, possible afterglow detection
  92. GRB 201017A: Fermi GBM detection
  93. GRB 201015A: classification as long GRB
  94. GRB 201017A: Fermi GBM Final Real-time Localization
  95. Fermi GBM Sub-Threshold Detection of GRB 201015A
  96. GRB 201016A: AstroSat CZTI detection
  97. GRB 201008A: Swift-XRT afterglow detection
  98. GRB 201016A: Fermi GBM detection
  99. Fermi GRB 201016B: Global MASTER-Net observations report
  100. GRB 201016B: BALROG localization (Fermi Trigger 624510986 / GRB 201016136)

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