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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"

24588 results found.

  1. Fermi GRB 220411A: Global MASTER-Net observations report
  2. GRB 220411A: BALROG localization (Fermi Trigger 671354405/ GRB 220411306)
  3. GRB 220411A: Fermi GBM Final Real-time Localization
  4. GRB 220403B: 1.3m DFOT Optical upper limit
  5. GRB 220408A: 1.3m DFOT Optical upper limit
  6. GRB 220408A: LOAO, DOAO, and, SAO optical upper limit
  7. GRB 220403C: Swift-XRT observations
  8. GRB 220408A: redshift lower limit estimating
  9. GRB 220408A: LCO Optical Afterglow Detection
  10. Fermi GRB 220408B: Global MASTER-Net observations report
  11. GRB 220408A: Fermi GBM observation
  12. GRB 220408B: Fermi GBM Final Localization
  13. GRB 220408A: KAIT Optical Observations
  14. Fermi GRB 220408A: Global MASTER-Net observations report
  15. GRB 220408A: Fermi GBM Final Real-time Localization
  16. Fermi-LAT Gamma-ray Observations of IceCube-220405B
  17. IceCube-220405A: No Candidate Counterparts from the Zwicky Transient Facility
  18. IceCube-220405B: No Candidate Counterparts from the Zwicky Transient Facility
  19. GRB 220403B: 1.5m OSN optical observation
  20. IceCube Alert 220405.93: Global MASTER-Net observations report
  21. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  22. GRB 220404A: Swift-BAT refined analysis
  23. Fermi-LAT Gamma-ray Observations of IceCube-220405A
  24. GRB 220405A: Fermi GBM Final Localization
  25. GRB 220403B: Swift-BAT refined analysis
  26. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  27. IceCube Alert 220405.21: Global MASTER-Net observations report
  28. GRB 220404B: Fermi GBM Final Real-time Localization
  29. GRB 220403B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  30. GRB 220403B: Fermi GBM detection
  31. GRB 220404A: Swift detection of a burst
  32. Swift GRB 220403B: Global MASTER-Net observations report
  33. GRB 220403C (or A): Swift/BAT-GUANO detection outside the coded FOV
  34. GRB 220403A: Tautenburg observations
  35. GRB 220403B: optical detection by D50
  36. GRB 220403B: Swift detection of a burst with an optical counterpart
  37. Fermi GRB 220403A: Global MASTER-Net observations report
  38. GRB 220403A: Fermi GBM Final Real-time Localization
  39. GRB 220401A: Swift/BAT-GUANO detection outside the coded FOV
  40. GRB 220401A: Fermi GBM observation
  41. Swift GRB220402.16: Global MASTER-Net observations report
  42. Fermi GRB 220401B: Global MASTER-Net observations report
  43. GRB 220401B: Fermi GBM Final Real-time Localization
  44. GRB 220401A: Fermi GBM Final Localization
  45. Fermi trigger No 670501065: Global MASTER-Net observations report
  46. GRB 220331A: Fermi GBM Final Real-time Localization
  47. Fermi GRB 220330A: Global MASTER-Net observations report
  48. GRB 220330A: Fermi GBM Final Real-time Localization
  49. ZTF22aaajecp/AT2022cmc: 1.3m DFOT Optical observations
  50. GRB 220325A: GRANDMA observations
  51. GRB 220320A: Detection by VZLUSAT-2
  52. Konus-Wind observation of GRB 220320A
  53. GRB 220325A: Swift-BAT refined analysis
  54. GRB 220325A: Tautenburg observations
  55. GRB 220326A: Fermi GBM Final Localization
  56. GRB 220325A: LCO Optical Upper Limits
  57. GRB 220325A: 1.3m DFOT Optical upper limit
  58. GRB 220325B: Fermi GBM Final Localization
  59. Fermi GBM Sub-Threshold Detection of GRB 220325A
  60. GRB 220325A: MASTER Global Robotic Net optical observations
  61. GRB 220319A: GRANDMA observations
  62. GRB 220323A: AGILE/MCAL detection
  63. IPN triangulation of GRB 220320A
  64. GRB 220323A: Fermi GBM Final Real-time Localization
  65. GRB 220319A: Swift-BAT refined analysis
  66. GRB 220317A: Fermi GBM detection
  67. GRB 220321A: Fermi GBM Final Localization
  68. GRB 220319A: MITSuME Akeno optical upper limits
  69. GRB 220319A: LCO Optical Upper Limit
  70. GRB 220319A: MASTER Global Robotic Net optical observations
  71. GRB 220319A: Swift detection of a burst
  72. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  73. IceCube-220317A: Upper limits from a search for additional neutrino events in IceCube
  74. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  75. GRB 220310A: MITSuME Akeno optical observation
  76. IceCube-220317A: MASTER Global Robotic Net optical observations
  77. GRB 220317A: Fermi GBM Final Real-time Localization
  78. IceCube-220317A - IceCube observation of a high-energy neutrino candidate track-like event
  79. GRB 220315A: MASTER Global Robotic Net optical observations
  80. GRB 220311A: Fermi GBM observation
  81. GRB 220315A: Fermi GBM Final Real-time Localization
  82. GRB 220311A: MITSuME Akeno optical upper limits
  83. IPN triangulation of GRB 220310A
  84. GRB 220310C: Fermi GBM observation
  85. GRB 220310C: Swift-XRT observations
  86. Konus-Wind detection of GRB 220310A
  87. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  88. GRB 220311A: A long GRB detected by INTEGRAL
  89. Integral GRB220311.69: Global MASTER-Net observations report
  90. Integral GRB220311.69: Global MASTER-Net observations report
  91. Integral GRB220311.69: Global MASTER-Net OT detection
  92. GRB 220311A: Fermi GBM Final Real-time Localization
  93. GRB 220310C: Fermi GBM Final Real-time Localization
  94. Fermi GBM Detection of GRB 220308A
  95. GRB 220308A: AGILE detection
  96. ZTF22aaajecp/AT2022cmc: Hubble Space Telescope Observations
  97. Fermi GRB 220310B: Global MASTER-Net observations report
  98. GRB 220310B: Fermi GBM Final Real-time Localization
  99. GRB 220308B: Fermi GBM detection
  100. MAXI GRB220310.02: Global MASTER-Net observations report

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