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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"

22212 results found.

  1. GRB 220210A: BOOTES-5/JGT optical afterglow candidate discarded
  2. GRB 220210A: BOOTES-5/JGT optical afterglow candidate
  3. GRB 220210A: Swift/BAT-GUANO localization
  4. Fermi GRB 220211A: Global MASTER-Net observations report
  5. Fermi GRB 220210A: Global MASTER-Net observations report
  6. GRB 210919A: Maidanak optical observations
  7. Fermi GRB 220209A: Global MASTER-Net observations report
  8. Fermi-LAT Gamma-ray Observations of IceCube-220205B
  9. Fermi-LAT Gamma-ray Observations of IceCube-220205A
  10. Konus-Wind detection of GRB 220130A
  11. IceCube-220205B - IceCube observation of a high-energy neutrino candidate track-like event
  12. GRB 220203A: Swift/BAT-GUANO detection outside the coded FOV
  13. Fermi-LAT Gamma-ray Observations of IceCube-220202A
  14. GRB 211227A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  15. IceCube Alert 220202.49: Global MASTER-Net observations report
  16. GRB 220131B: Swift/BAT-GUANO detection outside the coded FOV
  17. Fermi GRB 220131A: Global MASTER-Net observations report
  18. Fermi GRB 220129A: Global MASTER-Net observations report
  19. GECAM observations of a series of bursts from SGR J1935+2154
  20. Konus-Wind detection of GRB 220124A
  21. Fermi trigger No 664738369: Global MASTER-Net observations report
  22. GRB 220117A, GROND observations
  23. AGILE observations of a bright burst from SGR 1935+2154
  24. GRB 220118A: 2.2m CAHA/CAFOS detections
  25. GRB 220118A: COATLI Optical Observations
  26. GRB 220118A: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  27. GRB 220117C: Swift/BAT-GUANO arcminute localization
  28. Swift currently in safe hold with science slews disabled
  29. GRB 220118A: Swift/UVOT Detection
  30. GRB 220118A: GIT optical observations
  31. Swift GRB220118.50: Global MASTER-Net observations report
  32. Swift GRB 220118A: Global MASTER-Net observations report
  33. GRB 220117B: Swift/UVOT Upper Limits
  34. GRB 220117A: Swift/UVOT Upper Limits
  35. GRB 220117A: LCO Optical Observations
  36. GRB 220117A: VLT/X-shooter optical afterglow and redshift
  37. Fermi-LAT Gamma-ray Observations of IceCube-220115A and detection of a new gamma-ray source, Fermi J2350.2+2620
  38. GRB 220117B: Nanshan/NEXT optical upper limit
  39. GRB 220101A: TSHAO optical observation, Terskol, AbAO upper limits
  40. Swift GRB 220117A: Global MASTER-Net observations report
  41. Swift GRB 220117B: Global MASTER-Net observations report
  42. GRB 220117A: Nanshan/NEXT optical observations and a nearby PanSTARRS source
  43. GRB 220101A: The most powerful GRB and BDHN I in 26 years
  44. GECAM observations of a series of bursts from SGR J1935+2154
  45. Fermi trigger No 663960124: Global MASTER-Net observations report
  46. Fermi trigger No 663967527: Global MASTER-Net observations report
  47. Fermi trigger No 663923149: Global MASTER-Net observations report
  48. Fermi trigger No 663899819: Global MASTER-Net observations report
  49. Fermi trigger No 663886592: Global MASTER-Net observations report
  50. Fermi trigger No 663966693: Global MASTER-Net observations report
  51. IceCube Alert 220115.51: Global MASTER-Net observations report
  52. Fermi trigger No 663927396: Global MASTER-Net observations report
  53. Fermi trigger No 663921434: Global MASTER-Net observations report
  54. GRB 210919A: LBT spectroscopic redshift of the host galaxy candidates
  55. GECAM observations of a series of bursts from SGR J1935+2154
  56. Fermi trigger No 663763320: Global MASTER-Net observations report
  57. Fermi trigger No 663710289: Global MASTER-Net observations report
  58. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  59. AGILE observations of a burst from SGR 1935+2154
  60. GECAM observations of a series of bursts from SGR J1935+2154
  61. GRB 220101A: continued 1.3m DFOT optical observations of a high-redshift afterglow
  62. Fermi trigger No 663669570: Global MASTER-Net observations report
  63. Fermi trigger No 663658976: Global MASTER-Net observations report
  64. Fermi trigger No 663618072: Global MASTER-Net observations report
  65. Fermi GRB 220111A: Global MASTER-Net observations report
  66. Konus-Wind detection of GRB 220101A
  67. GRB 220107A: SAO RAS optical observations
  68. Konus-Wind detection of GRB 220107B
  69. Konus-Wind detection of GRB 220107A
  70. GECAM observations of a series of bursts from SGR J1935+2154
  71. GRB 220107A: further SAO RAS optical observations
  72. Fermi trigger No 663406755: Global MASTER-Net observations report
  73. GRB 220107A: SAO RAS optical observations
  74. GRB 220108A: Swift/BAT-GUANO detection outside the coded FOV
  75. GRB 220101A: SAO RAS optical observations
  76. GRB 220107A: AbAO and Terskol optical observations
  77. GRB 220107A: Nanshan/NEXT optical observations
  78. GRB 220107A: Swift/UVOT Detection
  79. GRB 220107B: Fermi GBM observations
  80. GRB 220107B: Swift-XRT afterglow detection
  81. GRB 220107A: Swift-XRT afterglow detection
  82. GRB 220107B: Tiled Swift observations
  83. GRB 220107A: Fermi GBM observations
  84. Fermi trigger No 663274898: Global MASTER-Net observations report
  85. GRB 220107A: Swift ToO observations
  86. Fermi GRB 220107A: Global MASTER-Net observations report
  87. GRB 220107A: Swift/BAT-GUANO arcminute localization
  88. GRB 220101A: Tautenburg observations
  89. GRB 220101A: Continued Mondy optical observations
  90. GRB 220101A: further TNG NIR observations
  91. GRB 220101A: continued 1.3m DFOT Optical Observations
  92. Fermi trigger No 663129379: Global MASTER-Net observations report
  93. GECAM observations of a series of bursts from SGR J1935+2154
  94. GRB 220101A: Mondy optical observations
  95. GRB 220101A: 3rd LCO Optical Observation
  96. GRB 220101A: iTelescope optical observations
  97. GRB 211227A: Lijiang 2.4m Telescope Optical Observations
  98. GRB 220101A: VLA detection
  99. GRB 220101A: 1.3m DFOT observations
  100. GRB 220101A: LCO Continued Optical Observations

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