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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"

11621 results found.

  1. Fermi GRB 201222B: Global MASTER-Net observations report
  2. GRB 201221D: Fermi GBM detection
  3. Fermi-LAT Gamma-ray Observations of IceCube-201222A
  4. Fermi-LAT Gamma-ray Observations of IceCube-201221A
  5. IceCube-201222A: not observable by Fermi-GBM
  6. GRB 201222B: BALROG localization (Fermi Trigger / GRB 201222461)
  7. GRB 201222B: Fermi GBM Final Real-time Localization
  8. Fermi GRB 201221E: Global MASTER-Net observations report
  9. IceCube-201222A: IceCube observation of a high-energy neutrino candidate event
  10. GRB 201222A: Fermi GBM Final Real-time Localization
  11. GRB 201221E: Fermi GBM Final Real-time Localization
  12. correction to GCN 29110 - Fermi GBM Sub-Threshold Detection of GRB 201221A
  13. Fermi GBM Sub-Threshold Detection of GRB 201221A
  14. IceCube-201221A: not observable by Fermi-GBM
  15. IceCube-201221A: IceCube observation of a high-energy neutrino candidate event
  16. GRB 201221B: Fermi GBM Final Real-time Localization
  17. Konus-Wind observation of GRB 201218A
  18. IPN triangulation of GRB 201218A
  19. Fermi GRB 201218B: Global MASTER-Net observations report
  20. GRB 201218B: Fermi GBM Final Real-time Localization
  21. Fermi GRB 201218A: Global MASTER-Net observations report
  22. GRB201216C: No significant detection in HAWC
  23. Konus-Wind detection of GRB 201216C
  24. GRB 201218A: BALROG localization (Fermi Trigger 629957660 / GRB 201218177)
  25. GRB 201218A: Fermi GBM Final Real-time Localization
  26. Fermi GRB 201217A: Global MASTER-Net observations report
  27. GRB 201217A: Fermi GBM Final Localization
  28. GRB 201216C: VLT X-shooter spectroscopy and potential high redshift of a VHE-emitting GRB
  29. GRB 201216C: Fermi-LAT upper limit
  30. GRB 201216C: MAGIC detection in very high energy gamma rays
  31. GRB 201216C: AstroSat CZTI detection
  32. GRB 201216C: Fermi GBM detection
  33. GRB 201216A: Fermi GBM detection
  34. GRB 201216C: FRAM-ORM afterglow confirmation
  35. GRB 201216A: Swift-XRT observations
  36. GRB 201216C: VLT afterglow candidate discovery
  37. GRB 201216C: Fermi GBM Final Real-time Localization
  38. Fermi GRB 201216A: Global MASTER-Net observations report
  39. GRB 201216A: Swift/BAT-GUANO detection and arcminute localization
  40. GRB 201216A: Fermi GBM Final Real-time Localization
  41. GRB 201214B: MITSuME Akeno optical upper limits
  42. GRB 201214B: Lowell Discovery Telescope optical observations
  43. Fermi GRB 201215A: Global MASTER-Net observations report
  44. GRB 201215A: BALROG localization (Fermi Trigger 629706213 / GRB 201215266)
  45. GRB 201215A: Fermi GBM Final Real-time Localization
  46. GRB 201214B: Swift BAT location of short burst
  47. Fermi GRB 201214B: Global MASTER-Net observations report
  48. GRB 201214B: Fermi GBM Final Real-time Localization
  49. GRB 201213A: Fermi GBM Final Real-time Localization
  50. IceCube-201209A: Upper limits from Fermi-GBM Observations
  51. Fermi-LAT Gamma-ray Observations of IceCube-201209A
  52. IPN triangulation of GRB 201207A
  53. GRB 201208A: Swift-XRT afterglow detection
  54. GRB 201208A: Fermi GBM observation
  55. GRB 201208A: LCO observations
  56. IceCube-201209A: IceCube observation of a high-energy neutrino candidate event
  57. GRB 201207A: AGILE detection
  58. GRB 201208A: Fermi-LAT detection
  59. GRB 201208A: Swift ToO observations
  60. GRB 201208A: AstroSat CZTI detection
  61. GRB 201207A: AstroSat CZTI detection
  62. Fermi GRB 201208A: Global MASTER-Net observations report
  63. GRB 201208A: Fermi GBM Final Real-time Localization
  64. Fermi GRB 201207A: Global MASTER-Net observations report
  65. GRB 201207A: Fermi GBM Final Real-time Localization
  66. Swift follow-up observations of the flat spectrum radio quasar PMN J0206-1150 in the error region of IceCube-201130A
  67. GRB201130A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 628407054)
  68. Swift observations of the Fermi-LAT source 4FGL J0206.4-1151 in the error region of IceCube-201130A
  69. Fermi-LAT Gamma-ray Observations of IceCube-201130A
  70. IceCube-201130A: Not observable by Fermi-GBM
  71. GRB 201201A: DDOTI Observations
  72. Fermi GRB 201201A: Global MASTER-Net observations report
  73. GRB 201201A: Fermi GBM Final Real-time Localization
  74. GRB 201128B: Swift/BAT-GUANO detection and arcminute localization
  75. IceCube-201130A: IceCube observation of a high-energy neutrino candidate event
  76. GRB 201130A: DDOTI Observations
  77. Fermi GRB 201130A: Global MASTER-Net observations report
  78. GRB 201130A: Fermi GBM Final Real-time Localization
  79. Fermi trigger No 628278856: Global MASTER-Net observations report
  80. Fermi trigger No 628140709: DDOTI/OAN optical observations report
  81. Fermi trigger No 628140709: Global MASTER-Net observations report
  82. GRB 201121A: Insight-HXMT/HE detection
  83. GRB 200826A: TNG and LBT constraints on a supernova bump
  84. IceCube-201114A: DECam observations and candidate optical counterpart
  85. Fermi-LAT Gamma-ray Observations of IceCube-201120A
  86. Fermi trigger No 627645769: Global MASTER-Net observations report
  87. IceCube-201120A: Swift-XRT non-detection of 4FGL J2028.6+4110e
  88. Fermi GRB 201121A: Global MASTER-Net observations report
  89. GRB 201121B: Fermi GBM Final Real-time Localization
  90. GRB 201121A: BALROG localization (Fermi Trigger 627614994 / GRB 201121062)
  91. GRB 201121A: Fermi GBM Final Real-time Localization
  92. Fermi GRB 201120B: Global MASTER-Net observations report
  93. GRB 201120B: Fermi GBM Final Localization
  94. GRB 201120A: Fermi GBM Final Localization
  95. IceCube-201120A: Upper limits from Fermi-GBM Observations
  96. Fermi trigger No 627557935: Global MASTER-Net observations report
  97. IceCube-201120A: IceCube observation of a high-energy neutrino candidate event
  98. IceCube 201114A: Swift followup of Fermi J0703.5+0505
  99. GRB 201116A: CALET Gamma-Ray Burst Monitor detection
  100. Fermi trigger No 627438255: Global MASTER-Net observations report

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