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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

11099 results found.

  1. GRB 220209A: GECAM detection
  2. GRB 220209A: AGILE/MCAL detection
  3. Fermi GRB 220209A: Global MASTER-Net observations report
  4. GRB 220209A: Fermi GBM Final Real-time Localization
  5. Fermi-LAT Gamma-ray Observations of IceCube-220205B
  6. Fermi-LAT Gamma-ray Observations of IceCube-220205A
  7. Konus-Wind detection of GRB 220130A
  8. IceCube-220205B - IceCube observation of a high-energy neutrino candidate track-like event
  9. IceCube-220205A - IceCube observation of a high-energy neutrino candidate track-like event
  10. IPN triangulation of GRB 220130A
  11. Fermi-LAT Gamma-ray Observations of IceCube-220202A
  12. IceCube-220202A: IceCube observation of a high-energy neutrino candidate track-like event
  13. GRB 220201A: Fermi GBM Final Localization
  14. GRB 220130A: Fermi GBM Observation
  15. Fermi GRB 220131A: Global MASTER-Net observations report
  16. GRB 220131A: Fermi GBM Final Real-time Localization
  17. Fermi GRB 220129A: Global MASTER-Net observations report
  18. GRB 220129A: Fermi GBM Final Real-time Localization
  19. GRB 220124A: GECAM detection
  20. Fermi trigger No 664738369: Global MASTER-Net observations report
  21. GRB 220117A: Terskol and AbAO optical upper limits
  22. Fermi-LAT-ANTARES 220121a: upper limits from a search for coincident neutrinos with IceCube
  23. Fermi-LAT-ANTARES 220121a Coincidence
  24. GRB 220117A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
  25. GRB 220120A: Fermi GBM Final Localization
  26. GRB 220117C: Fermi GBM Observation
  27. GRB 220118A: 2.2m CAHA/CAFOS detections
  28. GRB 220118A: Fermi GBM detection
  29. GRB 220118A: COATLI Optical Observations
  30. GRB 220117C: Swift/BAT-GUANO arcminute localization
  31. GRB 220118A: GIT optical observations
  32. GRB 220118A: MITSuME Akeno optical observation
  33. GRB 220118A: Fermi GBM Final Real-time Localization
  34. Fermi GBM Sub-Threshold Detection of GRB 220117A
  35. Fermi-LAT Gamma-ray Observations of IceCube-220115A and detection of a new gamma-ray source, Fermi J2350.2+2620
  36. GRB 220101A: TSHAO optical observation, Terskol, AbAO upper limits
  37. Fermi trigger No 663960124: Global MASTER-Net observations report
  38. Fermi trigger No 663967527: Global MASTER-Net observations report
  39. Fermi trigger No 663923149: Global MASTER-Net observations report
  40. Fermi trigger No 663899819: Global MASTER-Net observations report
  41. Fermi trigger No 663886592: Global MASTER-Net observations report
  42. Fermi trigger No 663966693: Global MASTER-Net observations report
  43. GRB 220115B: Fermi GBM Final Real-time Localization
  44. Fermi trigger No 663927396: Global MASTER-Net observations report
  45. Fermi trigger No 663921434: Global MASTER-Net observations report
  46. GRB 220115A: Fermi GBM Final Real-time Localization
  47. IceCube-220115A - IceCube observation of a high-energy neutrino candidate track-like event
  48. Fermi Gamma-ray Burst Monitor trigger 663917434/220115230 is not a GRB
  49. GRB 220114A: Fermi GBM Final Localization
  50. Fermi trigger No 663763320: Global MASTER-Net observations report
  51. Fermi trigger No 663710289: Global MASTER-Net observations report
  52. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  53. Fermi trigger No 663669570: Global MASTER-Net observations report
  54. GRB 220111A: AstroSat CZTI detection
  55. Fermi trigger No 663658976: Global MASTER-Net observations report
  56. Fermi trigger No 663618072: Global MASTER-Net observations report
  57. Fermi GRB 220111A: Global MASTER-Net observations report
  58. GRB 220111A: BALROG localization (Fermi Trigger 663621714 / GRB 220111807)
  59. GRB 220111A: Fermi GBM Final Real-time Localization
  60. Konus-Wind detection of GRB 220101A
  61. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB
  62. GRB 220107A: SAO RAS optical observations
  63. Konus-Wind detection of GRB 220107B
  64. Konus-Wind detection of GRB 220107A
  65. Confirmation of the X-ray afterglow of GRB 220107B
  66. GRB 220107A: further SAO RAS optical observations
  67. Fermi trigger No 663406755: Global MASTER-Net observations report
  68. GRB 220107A: 6m BTA spectroscopic redshift
  69. GRB 220107A: SAO RAS optical observations
  70. GRB 220101A: SAO RAS optical observations
  71. GRB 220107A: AbAO and Terskol optical observations
  72. GRB 220107B: MITSuME Akeno optical upper limits
  73. GRB 220107B: Nanshan/NEXT optical upper limits and host galaxy candidate
  74. GRB 220107A: Nanshan/NEXT optical observations
  75. GRB 220107A: Swift/UVOT Detection
  76. GRB 220107B: Fermi GBM observations
  77. GRB 220107A: MITSuME Akeno optical observation
  78. GRB 220107B: AstroSat CZTI detection
  79. GRB 220107B: Swift-XRT afterglow detection
  80. GRB 220107B: Fermi-LAT detection
  81. GRB 220107A: AstroSat CZTI detection
  82. GRB 220107B: Tiled Swift observations
  83. GRB 220107A: Fermi GBM observations
  84. Fermi trigger No 663274898: Global MASTER-Net observations report
  85. Fermi GRB 220107A: Global MASTER-Net observations report
  86. GRB 220107A: Swift/BAT-GUANO arcminute localization
  87. GRB 220107A: BALROG localization (Fermi Trigger 663259536 / GRB 220107615)
  88. GRB 220107A: Fermi GBM Final Real-time Localization
  89. GRB 220101A: Continued Mondy optical observations
  90. GECAM observation of a burst from SGR J1555.2-5402
  91. Fermi trigger No 663129379: Global MASTER-Net observations report
  92. GRB 220104A: Fermi GBM Observation
  93. GRB 220101A: Mondy optical observations
  94. GRB 220101A: 2.2m CAHA (+CAFOS) first day optical detection
  95. GRB 220104A：GECAM detection
  96. Fermi GRB 220104A: Global MASTER-Net observations report
  97. GRB 220104A: Fermi GBM Final Real-time Localization
  98. GRB 211229B: Fermi GBM observation
  99. Fermi GRB 220103A: Global MASTER-Net observations report
  100. GRB 220103A: Fermi GBM Final Real-time Localization

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