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

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