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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"

3040 results found.

  1. Fermi trigger No 678058621: Global MASTER-Net observations report
  2. IceCube Alert 220627.74: Global MASTER-Net observations report
  3. Fermi GRB 220623B: Global MASTER-Net observations report
  4. GRB 220624A: AGILE detection
  5. GRB 220618A: Swift-BAT refined analysis
  6. Fermi trigger No 677377371: Global MASTER-Net observations report
  7. Fermi trigger No 677307509: Global MASTER-Net observations report
  8. Fermi trigger No 677174940: Global MASTER-Net observations report
  9. IPN triangulation of GRB 220613A
  10. Fermi trigger No 676909037: Global MASTER-Net observations report
  11. Fermi GRB 220610A: Global MASTER-Net observations report
  12. MAXI GRB220607.31: Global MASTER-Net observations report
  13. MAXI GRB220607.41: Global MASTER-Net observations report
  14. Konus-Wind detection of GRB 220601A
  15. Fermi trigger No 675992935: Global MASTER-Net observations report
  16. Fermi trigger No 675411172: Global MASTER-Net observations report
  17. GRB 220521A: ISON-Castelgrande observatory optical observations
  18. Swift GRB220521.97: Global MASTER-Net observations report
  19. IceCube-220513A: No significant detection in HAWC
  20. Integral GRB220514.52: Global MASTER-Net observations report
  21. Fermi GRB 220514A: Global MASTER-Net observations report
  22. Fermi GRB 220513A: Global MASTER-Net observations report
  23. Konus-Wind detection of GRB 220511A
  24. GRB 220511A: Swift/BAT-GUANO arcminute localization
  25. GRB 220511A: AGILE detection
  26. Fermi trigger No 673846271: Global MASTER-Net observations report
  27. Swift GRB220506.51: Global MASTER-Net observations report
  28. GRB 220427A: LCO Optical Observations
  29. GRB 220501A: Swift-BAT refined analysis
  30. GRB 220426A: Swift-XRT and UVOT observations
  31. Fermi GRB 220426A: Global MASTER-Net observations report
  32. Fermi GRB 220426B: Global MASTER-Net observations report
  33. Fermi trigger No 672492774: Global MASTER-Net observations report
  34. IceCube Alert 220424.05: Global MASTER-Net observations report
  35. GRB 220421A: Fermi GBM observation
  36. Fermi trigger No 672093919: Global MASTER-Net observations report
  37. IPN triangulation of GRB 220411A
  38. GRB 220408A: Swift-BAT refined analysis
  39. GRB 220408A: 1.3m DFOT Optical upper limit
  40. GRB 220408A: LOAO, DOAO, and, SAO optical upper limit
  41. GRB 220408A: LCO Optical Afterglow Detection
  42. Fermi GRB 220408B: Global MASTER-Net observations report
  43. GRB 220408A: Fermi GBM observation
  44. Fermi-LAT Gamma-ray Observations of IceCube-220405A
  45. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  46. Fermi GRB 220401B: Global MASTER-Net observations report
  47. Fermi GRB 220330A: Global MASTER-Net observations report
  48. GRB 220325A: Swift-BAT refined analysis
  49. GRB 220319A: MASTER Global Robotic Net optical observations
  50. GRB 220310A: MAXI/GSC detection
  51. Konus-Wind detection of GRB 220308A
  52. Fermi GRB 220309A: Global MASTER-Net observations report
  53. IPN triangulation of GRB 220308A (long / very bright)
  54. IPN triangulation of GRB 220305B
  55. Fermi GRB 220223A: Global MASTER-Net observations report
  56. ZTF22aaajecp/AT2022cmc: Swift Observation and a UV Detection
  57. ZTF22aabjpxh/AT2022cva: NICER X-ray detection is consistent with a GRB afterglow
  58. Fermi GRB 220222A: Global MASTER-Net observations report
  59. ZTF22aabjpxh/AT2022cva: Assy optical observations
  60. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  61. IceCube Alert 220221.03: Global MASTER-Net observations report
  62. Konus-Wind observation of GRB 220219A
  63. IPN triangulation of GRB 220219A
  64. IceCube Alert 220220.60: Global MASTER-Net observations report
  65. Fermi trigger No 666962499: Global MASTER-Net observations report
  66. ZTF22aaajecp/AT2022cmc: VLA radio detection
  67. Fermi trigger No 666489765: Global MASTER-Net observations report
  68. GRB 211227A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  69. IceCube Alert 220202.49: Global MASTER-Net observations report
  70. IPN triangulation of GRB 220128A (long)
  71. GRB 220129A: Fermi GBM Final Real-time Localization
  72. Fermi trigger No 664738369: Global MASTER-Net observations report
  73. GRB 220118A: TARGET optical upper limit
  74. GRB 220117A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
  75. GRB 220117A: Nanshan/NEXT optical observations and a nearby PanSTARRS source
  76. Fermi trigger No 663966693: Global MASTER-Net observations report
  77. IceCube Alert 220115.51: Global MASTER-Net observations report
  78. Fermi trigger No 663927396: Global MASTER-Net observations report
  79. GECAM observations of a series of bursts from SGR J1935+2154
  80. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  81. Fermi GRB 220111A: Global MASTER-Net observations report
  82. Fermi trigger No 663274898: Global MASTER-Net observations report
  83. Fermi GRB 220107A: Global MASTER-Net observations report
  84. GRB 220101A: Continued Mondy optical observations
  85. GRB 220101A: TNG NIR afterglow detection
  86. GRB 220101A: Swift-BAT refined analysis
  87. IceCube-20211216B: observations of SN2021gpw in the errorbox of the neutrino trigger
  88. GRB 211225B: Swift-BAT refined analysis
  89. GRB 211225A: MITSuME Akeno optical upper limits
  90. GRB 211225A/MAXI J0827-071: MAXI/GSC detection
  91. Fermi trigger No 662084433: Global MASTER-Net observations report
  92. GRB 211218A: MITSuME Akeno optical upper limits
  93. Fermi GRB 211219B: Global MASTER-Net observations report
  94. Fermi GRB 211216A: Global MASTER-Net observations report
  95. GRB 211211A: LCO Optical Observations
  96. Fermi GRB 211211B: Global MASTER-Net observations report
  97. IceCube-211208A: No significant detection in HAWC
  98. Fermi trigger No 660736561: Global MASTER-Net observations report
  99. GRB 211204C: AstroSat CZTI detection
  100. GRB 211129A: Nanshan/NEXT optical upper limit

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