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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"

24589 results found.

  1. GRB 220408A: Swift-BAT refined analysis
  2. Fermi GRB 220411A: Global MASTER-Net observations report
  3. GRB 220411A: BALROG localization (Fermi Trigger 671354405/ GRB 220411306)
  4. GRB 220411A: Fermi GBM Final Real-time Localization
  5. GRB 220403B: 1.3m DFOT Optical upper limit
  6. GRB 220408A: 1.3m DFOT Optical upper limit
  7. GRB 220408A: LOAO, DOAO, and, SAO optical upper limit
  8. GRB 220403C: Swift-XRT observations
  9. GRB 220408A: redshift lower limit estimating
  10. GRB 220408A: LCO Optical Afterglow Detection
  11. Fermi GRB 220408B: Global MASTER-Net observations report
  12. GRB 220408A: Fermi GBM observation
  13. GRB 220408B: Fermi GBM Final Localization
  14. GRB 220408A: KAIT Optical Observations
  15. Fermi GRB 220408A: Global MASTER-Net observations report
  16. GRB 220408A: Fermi GBM Final Real-time Localization
  17. Fermi-LAT Gamma-ray Observations of IceCube-220405B
  18. IceCube-220405A: No Candidate Counterparts from the Zwicky Transient Facility
  19. IceCube-220405B: No Candidate Counterparts from the Zwicky Transient Facility
  20. GRB 220403B: 1.5m OSN optical observation
  21. IceCube Alert 220405.93: Global MASTER-Net observations report
  22. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  23. GRB 220404A: Swift-BAT refined analysis
  24. Fermi-LAT Gamma-ray Observations of IceCube-220405A
  25. GRB 220405A: Fermi GBM Final Localization
  26. GRB 220403B: Swift-BAT refined analysis
  27. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  28. IceCube Alert 220405.21: Global MASTER-Net observations report
  29. GRB 220404B: Fermi GBM Final Real-time Localization
  30. GRB 220403B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  31. GRB 220403B: Fermi GBM detection
  32. GRB 220404A: Swift detection of a burst
  33. Swift GRB 220403B: Global MASTER-Net observations report
  34. GRB 220403C (or A): Swift/BAT-GUANO detection outside the coded FOV
  35. GRB 220403A: Tautenburg observations
  36. GRB 220403B: optical detection by D50
  37. GRB 220403B: Swift detection of a burst with an optical counterpart
  38. Fermi GRB 220403A: Global MASTER-Net observations report
  39. GRB 220403A: Fermi GBM Final Real-time Localization
  40. GRB 220401A: Swift/BAT-GUANO detection outside the coded FOV
  41. GRB 220401A: Fermi GBM observation
  42. Swift GRB220402.16: Global MASTER-Net observations report
  43. Fermi GRB 220401B: Global MASTER-Net observations report
  44. GRB 220401B: Fermi GBM Final Real-time Localization
  45. GRB 220401A: Fermi GBM Final Localization
  46. Fermi trigger No 670501065: Global MASTER-Net observations report
  47. GRB 220331A: Fermi GBM Final Real-time Localization
  48. Fermi GRB 220330A: Global MASTER-Net observations report
  49. GRB 220330A: Fermi GBM Final Real-time Localization
  50. ZTF22aaajecp/AT2022cmc: 1.3m DFOT Optical observations
  51. GRB 220325A: GRANDMA observations
  52. GRB 220320A: Detection by VZLUSAT-2
  53. Konus-Wind observation of GRB 220320A
  54. GRB 220325A: Swift-BAT refined analysis
  55. GRB 220325A: Tautenburg observations
  56. GRB 220326A: Fermi GBM Final Localization
  57. GRB 220325A: LCO Optical Upper Limits
  58. GRB 220325A: 1.3m DFOT Optical upper limit
  59. GRB 220325B: Fermi GBM Final Localization
  60. Fermi GBM Sub-Threshold Detection of GRB 220325A
  61. GRB 220325A: MASTER Global Robotic Net optical observations
  62. GRB 220319A: GRANDMA observations
  63. GRB 220323A: AGILE/MCAL detection
  64. IPN triangulation of GRB 220320A
  65. GRB 220323A: Fermi GBM Final Real-time Localization
  66. GRB 220319A: Swift-BAT refined analysis
  67. GRB 220317A: Fermi GBM detection
  68. GRB 220321A: Fermi GBM Final Localization
  69. GRB 220319A: MITSuME Akeno optical upper limits
  70. GRB 220319A: LCO Optical Upper Limit
  71. GRB 220319A: MASTER Global Robotic Net optical observations
  72. GRB 220319A: Swift detection of a burst
  73. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  74. IceCube-220317A: Upper limits from a search for additional neutrino events in IceCube
  75. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  76. GRB 220310A: MITSuME Akeno optical observation
  77. IceCube-220317A: MASTER Global Robotic Net optical observations
  78. GRB 220317A: Fermi GBM Final Real-time Localization
  79. IceCube-220317A - IceCube observation of a high-energy neutrino candidate track-like event
  80. GRB 220315A: MASTER Global Robotic Net optical observations
  81. GRB 220311A: Fermi GBM observation
  82. GRB 220315A: Fermi GBM Final Real-time Localization
  83. GRB 220311A: MITSuME Akeno optical upper limits
  84. IPN triangulation of GRB 220310A
  85. GRB 220310C: Fermi GBM observation
  86. GRB 220310C: Swift-XRT observations
  87. Konus-Wind detection of GRB 220310A
  88. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  89. GRB 220311A: A long GRB detected by INTEGRAL
  90. Integral GRB220311.69: Global MASTER-Net observations report
  91. Integral GRB220311.69: Global MASTER-Net observations report
  92. Integral GRB220311.69: Global MASTER-Net OT detection
  93. GRB 220311A: Fermi GBM Final Real-time Localization
  94. GRB 220310C: Fermi GBM Final Real-time Localization
  95. Fermi GBM Detection of GRB 220308A
  96. GRB 220308A: AGILE detection
  97. ZTF22aaajecp/AT2022cmc: Hubble Space Telescope Observations
  98. Fermi GRB 220310B: Global MASTER-Net observations report
  99. GRB 220310B: Fermi GBM Final Real-time Localization
  100. GRB 220308B: Fermi GBM detection

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