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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"

5401 results found.

  1. GRB 220514A: KAIT Optical Afterglow Confirmation
  2. GRB 220514B: MAXI/GSC detection
  3. MAXI GRB220514.98: Global MASTER-Net observations report
  4. Fermi GRB 220513A: Global MASTER-Net observations report
  5. GRB 220512A: Fermi GBM Final Real-time Localization
  6. GRB 220427A: Swift detection of a burst with an optical counterpart
  7. Fermi trigger No 672492774: Global MASTER-Net observations report
  8. GRB 220421B: Detection by VZLUSAT-2
  9. IPN triangulation of GRB 220411A
  10. Fermi GRB 220417A: Global MASTER-Net observations report
  11. Fermi trigger No 671729344: Global MASTER-Net observations report
  12. GRB 220412A: Continued RATIR Observations and Steepening of the Light Curve
  13. GRB 220412A: BOOTES-network optical upper limits
  14. GRB 220412B: BOOTES-1 optical upper limit
  15. GRB 220412A: RATIR Observations of the Fading Afterglow
  16. Correction to GCN 31888: GRB 220412A: Swift-XRT refined Analysis
  17. GRB 220408A: Swift-BAT refined analysis
  18. Fermi GRB 220411A: Global MASTER-Net observations report
  19. GRB 220408A: NOT optical observations and archival detection
  20. Fermi GRB 220408B: Global MASTER-Net observations report
  21. GRB 220408A: Swift detection of a burst with an optical counterpart, possibly associated with M51
  22. ZTF22aaajecp/AT2022cmc: continued optical observations (Mondy, SAO RAS, CrAO)
  23. GRB 220403B: 1.5m OSN optical observation
  24. GRB 220403B: Kitab optical observations
  25. GRB 220403B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  26. GRB 220403B: Fermi GBM detection
  27. GRB 220403B: Nanshan/NEXT optical afterglow power-law decay
  28. GRB 220403A: Tautenburg observations
  29. Fermi GRB 220403A: Global MASTER-Net observations report
  30. Swift Trigger 1100848 is likely not a GRB
  31. Swift GRB220402.16: Global MASTER-Net observations report
  32. Fermi GRB 220401B: Global MASTER-Net observations report
  33. Fermi GRB 220330A: Global MASTER-Net observations report
  34. ZTF22aaajecp/AT2022cmc: 1.3m DFOT Optical observations
  35. GRB 220325A: Swift-BAT refined analysis
  36. ZTF22aaajecp/AT2022cmc: continued optical observations (Mondy, TSHAO, AbAO)
  37. GRB 220325A: Tautenburg observations
  38. GRB 220325A: 1.3m DFOT Optical upper limit
  39. GRB 220325A: MASTER Global Robotic Net optical observations
  40. GRB 220324A: AstroSat CZTI detection
  41. GRB 220323A: AstroSat CZTI detection
  42. GRB 220323A: AGILE/MCAL detection
  43. GRB 220316A: AstroSat CZTI detection
  44. GRB 220320A: AstroSat CZTI detection
  45. GRB 220319A: MITSuME Akeno optical upper limits
  46. GRB 220319A: Mondy optical uper limit
  47. GRB 220319A: MASTER Global Robotic Net optical observations
  48. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  49. IceCube-220317A: Upper limits from a search for additional neutrino events in IceCube
  50. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  51. GRB 220310A: MITSuME Akeno optical observation
  52. IceCube-220317A: MASTER Global Robotic Net optical observations
  53. IceCube-220317A - IceCube observation of a high-energy neutrino candidate track-like event
  54. GRB 220315A: MASTER Global Robotic Net optical observations
  55. GRB 220311A: MITSuME Akeno optical upper limits
  56. GRB 220310A: K-800 of Terskol observatory optical upper limit
  57. GRB 220310A: [KAO-Egypt] SDSS r, i observation
  58. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  59. Integral GRB220311.69: Global MASTER-Net observations report
  60. Integral GRB220311.69: Global MASTER-Net observations report
  61. Integral GRB220311.69: Global MASTER-Net OT detection
  62. ZTF22aabjpxh/AT2022cva (GRB 220219B): evidence of supernova in LBT spectra
  63. GRB 220306B: Nanshan/NEXT optical upper limit
  64. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN
  65. Fermi GBM Detection of GRB 220308A
  66. GRB 220308A: AGILE detection
  67. GRB 220310A: MASTER optical counterpart detection
  68. Fermi GRB 220310B: Global MASTER-Net observations report
  69. GRB 220310A: MAXI/GSC detection
  70. MAXI GRB220310.02: Global MASTER-Net observations report
  71. IceCube-220306A: No significant detection in HAWC
  72. IceCube-220303A: No significant detection in HAWC
  73. Fermi GRB 220309A: Global MASTER-Net observations report
  74. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  75. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  76. Fermi trigger No 668410535: Global MASTER-Net observations report
  77. GRB 220306B: Tautenburg observations
  78. IceCube-220306A: Upper limits from a search for additional neutrino events in IceCube
  79. IceCube-220304A: Upper limits from a search for additional neutrino events in IceCube
  80. Fermi-LAT Gamma-ray Observations of IceCube-220306A
  81. GRB 220306B: AbAO optical observations, possible afterglow candidate
  82. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  83. Swift GRB 220306B: Global MASTER-Net observations report
  84. Fermi GRB 220306A: Global MASTER-Net observations report
  85. IceCube-220306A - IceCube observation of a high-energy neutrino candidate track-like event
  86. Fermi GRB 220305A: Global MASTER-Net observations report
  87. IceCube-220303A: One X-ray counterpart from Swift/XRT follow up observations
  88. Swift GRB 220305A: Global MASTER-Net observations report
  89. GRB 220305A: Swift-XRT observations
  90. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  91. IceCube-220303A: Upper limits from a search for additional neutrino events in IceCube
  92. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  93. IceCube-220304A - IceCube observation of a high-energy neutrino candidate track-like event
  94. IceCube Alert 220304.74: Global MASTER-Net observations report
  95. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  96. Fermi GRB 220304A: Global MASTER-Net observations report
  97. Tev Blazar as possible optical counterpart of the high-energy neutrino IceCube-220303A
  98. IceCube Alert 220303.75: Global MASTER-Net observations report
  99. IceCube-220303A - IceCube observation of a high-energy neutrino candidate track-like event
  100. Swift GRB 220302A: Global MASTER-Net observations report

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