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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"

11611 results found.

  1. GRB 210328A: AstroSat CZTI detection
  2. Konus-Wind detection of GRB 210401A
  3. GRB 210402A: Swift detection of a burst
  4. Fermi trigger No 639093861: Global MASTER-Net observations report
  5. Fermi GRB 210401A: Global MASTER-Net observations report
  6. GRB 210401A: Fermi GBM Final Real-time Localization
  7. GRB 210328A: GECAM detection
  8. GRB 210324A: AstroSat CZTI detection
  9. GRB 210324C: AstroSat CZTI detection
  10. GRB 210328A: BALROG localization (Fermi Trigger / GRB 210328865)
  11. GRB 210328A: Fermi GBM Final Real-time Localization
  12. GRB 210326A: Insight-HXMT/HE detection
  13. GRB 210326A: Fermi GBM Final Localization
  14. Fermi trigger No 638414549: Global MASTER-Net observations report
  15. IPN triangulation of GRB 210324C
  16. GRB 210323A: Insight-HXMT/HE detection
  17. Fermi GRB 210324C: Global MASTER-Net observations report
  18. Fermi GRB 210324B: Global MASTER-Net observations report
  19. GRB 210323A: Gemini-North Optical Source Detection
  20. GRB 210324C: BALROG localization (Fermi Trigger 638308803 / GRB 210324833)
  21. GRB 210324C: Fermi GBM Final Real-time Localization
  22. Short GRB 210323A: GTC Observations
  23. GRB 210324B: Fermi GBM Final Real-time Localization
  24. Konus-Wind detection of GRB 210323A (short)
  25. GRB 210323A: Classification and redshift estimation
  26. GRB 210323A: Kitab optical upper limit
  27. GRB 210323A: Fermi GBM detection
  28. GRB 210324A: Fermi GBM Final Real-time Localization
  29. GRB 210323B: Swift/BAT-GUANO detection and possible arcminute localization
  30. Fermi GBM trigger 637977270/210320996 is not a GRB
  31. GRB 200524A: Redshift from Gemini-North
  32. GRB 210318B: Fermi GBM detection
  33. Fermi trigger No 637729731: Global MASTER-Net observations report
  34. Fermi GRB 210317A: Global MASTER-Net observations report
  35. GRB 210317A: GECAM detection
  36. GRB 210317A: Fermi GBM Final Real-time Localization
  37. Fermi trigger No 637521056: Global MASTER-Net observations report
  38. Fermi GRB 210312A: Global MASTER-Net observations report
  39. GRB 210312A: Fermi GBM Final Real-time Localization
  40. Konus-Wind detection of GRB 210308A
  41. Konus-Wind detection of GRB 210306A
  42. Konus-Wind detection of GRB 210305A
  43. Fermi trigger No 637027080: Global MASTER-Net observations report
  44. GRB 210306B: Fermi GBM detection
  45. Fermi trigger No 636926765: Global MASTER-Net observations report
  46. GRB 210305A: Fermi GBM observation
  47. GRB 210308A: Fermi GBM detection
  48. GRB 210306A: Fermi GBM observation
  49. GRB 210306A: Fermi-LAT detection
  50. GRB 210228B: Insight-HXMT/HE detection
  51. Fermi trigger No 636459103: Global MASTER-Net observations report
  52. Fermi trigger No 636187116: Global MASTER-Net observations report
  53. GRB 210228A: GECAM detection
  54. Fermi trigger No 636168178: Global MASTER-Net observations report
  55. GRB 210225A: Insight-HXMT/HE detection
  56. GRB 210226A: Fermi GBM detection
  57. Fermi trigger No 635922820: Global MASTER-Net observations report
  58. Fermi GBM Sub-Threshold Detection of GRB 210217A
  59. Fermi/GBM observation of a burst from SGR 1830-0645
  60. GRB 210204A (ZTF21aagwbjr/AT2021buv): continued Assy and Mondy optical observations
  61. GRB 210211A: ePESSTO+ NTT optical observations
  62. Fermi GRB 210213A: Global MASTER-Net observations report
  63. GRB 210213A: Fermi GBM Final Real-time Localization
  64. GRB 210204A (ZTF21aagwbjr/AT2021buv): continued CrAO and AbAO optical observations
  65. GRB 210204A: observations with the 3.6m Devasthal Optical Telescope and possible jet break
  66. GRB 210211A: Fermi GBM observation
  67. GRB 210210A as a BdHN II
  68. Fermi-LAT Gamma-ray Observations of IceCube-210210A
  69. GRB 210211A: Fermi GBM Final Real-time Localization
  70. Fermi trigger No 634659312: Global MASTER-Net observations report
  71. Fermi GRB 210210B: Global MASTER-Net observations report
  72. IceCube-210210A: Upper limits from Fermi-GBM Observations
  73. GRB 210210B: Fermi GBM Final Real-time Localization
  74. IceCube-210210A: IceCube observation of a high-energy neutrino candidate event
  75. ZTF21aahifke/AT2021clk: ZTF discovery of an optical fast transient (possible afterglow)
  76. GRB 210204A (ZTF21aagwbjr/AT2021buv): continued Mondy optical observations
  77. GRB 210204A: LBT observations and jet break
  78. GRB 210204A: redshift revision of ZTF21aagwbjr/AT2021buv (correction to GCN 29411)
  79. Fermi GRB 210207A: Global MASTER-Net observations report
  80. GRB 210207A: BALROG localization (Fermi Trigger / GRB 210207603)
  81. GRB 210204A (ZTF21aagwbjr/AT2021buv): Mondy and AbAO optical observations
  82. GRB 210207A: Fermi GBM Final Real-time Localization
  83. Konus-Wind detection of GRB 210204A / ZTF21aagwbjr
  84. GRB 210204A: Optical Observations from HCT
  85. GRB 210204A / ZTF21aagwbjr: Swift-XRT observations
  86. GRB 210204A: Swift ToO observations
  87. VLT/X-shooter redshift of 1.466 for ZTF21aagwbjr/AT2021buv, strengthening its association with GRB 210204A
  88. GRB 210204A: AstroSat CZTI Detection
  89. IPN triangulation of GRB 210204A
  90. ZTF21aagwbjr/AT2021buv: ZTF discovery of a fast optical transient likely associated with GRB 210104A
  91. Fermi GRB 210204B: Global MASTER-Net observations report
  92. Fermi GRB 210204A: Global MASTER-Net observations report
  93. GRB 210204B: Fermi GBM Final Real-time Localization
  94. GRB 210204: Fermi GBM observation
  95. GRB 210204A: GECAM detection
  96. GRB 210204A: BALROG localization (Fermi Trigger 634112970 / GRB 210204270)
  97. GRB 210204A: Fermi GBM Final Real-time Localization
  98. GRB 210202A: AGILE/MCAL detection
  99. Fermi GBM Observations of a bright burst from SGR J1935+2154
  100. GRB 210202A: Fermi GBM detection

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