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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"

3043 results found.

  1. Fermi GRB 220711B: Global MASTER-Net observations report
  2. MAXI GRB220706.73: Global MASTER-Net observations report
  3. GRB 200701A: KAIT Optical Upper Limit
  4. Fermi trigger No 678058621: Global MASTER-Net observations report
  5. IceCube Alert 220627.74: Global MASTER-Net observations report
  6. Fermi GRB 220623B: Global MASTER-Net observations report
  7. GRB 220624A: AGILE detection
  8. GRB 220618A: Swift-BAT refined analysis
  9. Fermi trigger No 677377371: Global MASTER-Net observations report
  10. Fermi trigger No 677307509: Global MASTER-Net observations report
  11. Fermi trigger No 677174940: Global MASTER-Net observations report
  12. IPN triangulation of GRB 220613A
  13. Fermi trigger No 676909037: Global MASTER-Net observations report
  14. Fermi GRB 220610A: Global MASTER-Net observations report
  15. MAXI GRB220607.31: Global MASTER-Net observations report
  16. MAXI GRB220607.41: Global MASTER-Net observations report
  17. Konus-Wind detection of GRB 220601A
  18. Fermi trigger No 675992935: Global MASTER-Net observations report
  19. Fermi trigger No 675411172: Global MASTER-Net observations report
  20. GRB 220521A: ISON-Castelgrande observatory optical observations
  21. Swift GRB220521.97: Global MASTER-Net observations report
  22. IceCube-220513A: No significant detection in HAWC
  23. Integral GRB220514.52: Global MASTER-Net observations report
  24. Fermi GRB 220514A: Global MASTER-Net observations report
  25. Fermi GRB 220513A: Global MASTER-Net observations report
  26. Konus-Wind detection of GRB 220511A
  27. GRB 220511A: Swift/BAT-GUANO arcminute localization
  28. GRB 220511A: AGILE detection
  29. Fermi trigger No 673846271: Global MASTER-Net observations report
  30. Swift GRB220506.51: Global MASTER-Net observations report
  31. GRB 220427A: LCO Optical Observations
  32. GRB 220501A: Swift-BAT refined analysis
  33. GRB 220426A: Swift-XRT and UVOT observations
  34. Fermi GRB 220426A: Global MASTER-Net observations report
  35. Fermi GRB 220426B: Global MASTER-Net observations report
  36. Fermi trigger No 672492774: Global MASTER-Net observations report
  37. IceCube Alert 220424.05: Global MASTER-Net observations report
  38. GRB 220421A: Fermi GBM observation
  39. Fermi trigger No 672093919: Global MASTER-Net observations report
  40. IPN triangulation of GRB 220411A
  41. GRB 220408A: Swift-BAT refined analysis
  42. GRB 220408A: 1.3m DFOT Optical upper limit
  43. GRB 220408A: LOAO, DOAO, and, SAO optical upper limit
  44. GRB 220408A: LCO Optical Afterglow Detection
  45. Fermi GRB 220408B: Global MASTER-Net observations report
  46. GRB 220408A: Fermi GBM observation
  47. Fermi-LAT Gamma-ray Observations of IceCube-220405A
  48. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  49. Fermi GRB 220401B: Global MASTER-Net observations report
  50. Fermi GRB 220330A: Global MASTER-Net observations report
  51. GRB 220325A: Swift-BAT refined analysis
  52. GRB 220319A: MASTER Global Robotic Net optical observations
  53. GRB 220310A: MAXI/GSC detection
  54. Konus-Wind detection of GRB 220308A
  55. Fermi GRB 220309A: Global MASTER-Net observations report
  56. IPN triangulation of GRB 220308A (long / very bright)
  57. IPN triangulation of GRB 220305B
  58. Fermi GRB 220223A: Global MASTER-Net observations report
  59. ZTF22aaajecp/AT2022cmc: Swift Observation and a UV Detection
  60. ZTF22aabjpxh/AT2022cva: NICER X-ray detection is consistent with a GRB afterglow
  61. Fermi GRB 220222A: Global MASTER-Net observations report
  62. ZTF22aabjpxh/AT2022cva: Assy optical observations
  63. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  64. IceCube Alert 220221.03: Global MASTER-Net observations report
  65. Konus-Wind observation of GRB 220219A
  66. IPN triangulation of GRB 220219A
  67. IceCube Alert 220220.60: Global MASTER-Net observations report
  68. Fermi trigger No 666962499: Global MASTER-Net observations report
  69. ZTF22aaajecp/AT2022cmc: VLA radio detection
  70. Fermi trigger No 666489765: Global MASTER-Net observations report
  71. GRB 211227A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  72. IceCube Alert 220202.49: Global MASTER-Net observations report
  73. IPN triangulation of GRB 220128A (long)
  74. GRB 220129A: Fermi GBM Final Real-time Localization
  75. Fermi trigger No 664738369: Global MASTER-Net observations report
  76. GRB 220118A: TARGET optical upper limit
  77. GRB 220117A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
  78. GRB 220117A: Nanshan/NEXT optical observations and a nearby PanSTARRS source
  79. Fermi trigger No 663966693: Global MASTER-Net observations report
  80. IceCube Alert 220115.51: Global MASTER-Net observations report
  81. Fermi trigger No 663927396: Global MASTER-Net observations report
  82. GECAM observations of a series of bursts from SGR J1935+2154
  83. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  84. Fermi GRB 220111A: Global MASTER-Net observations report
  85. Fermi trigger No 663274898: Global MASTER-Net observations report
  86. Fermi GRB 220107A: Global MASTER-Net observations report
  87. GRB 220101A: Continued Mondy optical observations
  88. GRB 220101A: TNG NIR afterglow detection
  89. GRB 220101A: Swift-BAT refined analysis
  90. IceCube-20211216B: observations of SN2021gpw in the errorbox of the neutrino trigger
  91. GRB 211225B: Swift-BAT refined analysis
  92. GRB 211225A: MITSuME Akeno optical upper limits
  93. GRB 211225A/MAXI J0827-071: MAXI/GSC detection
  94. Fermi trigger No 662084433: Global MASTER-Net observations report
  95. GRB 211218A: MITSuME Akeno optical upper limits
  96. Fermi GRB 211219B: Global MASTER-Net observations report
  97. Fermi GRB 211216A: Global MASTER-Net observations report
  98. GRB 211211A: LCO Optical Observations
  99. Fermi GRB 211211B: Global MASTER-Net observations report
  100. IceCube-211208A: No significant detection in HAWC

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