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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

22208 results found.

  1. Fermi GRB 220210A: Global MASTER-Net observations report
  2. GRB 210919A: Maidanak optical observations
  3. Fermi GRB 220209A: Global MASTER-Net observations report
  4. Fermi-LAT Gamma-ray Observations of IceCube-220205B
  5. Fermi-LAT Gamma-ray Observations of IceCube-220205A
  6. Konus-Wind detection of GRB 220130A
  7. IceCube-220205B - IceCube observation of a high-energy neutrino candidate track-like event
  8. GRB 220203A: Swift/BAT-GUANO detection outside the coded FOV
  9. Fermi-LAT Gamma-ray Observations of IceCube-220202A
  10. GRB 211227A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  11. IceCube Alert 220202.49: Global MASTER-Net observations report
  12. GRB 220131B: Swift/BAT-GUANO detection outside the coded FOV
  13. Fermi GRB 220131A: Global MASTER-Net observations report
  14. Fermi GRB 220129A: Global MASTER-Net observations report
  15. GECAM observations of a series of bursts from SGR J1935+2154
  16. Konus-Wind detection of GRB 220124A
  17. Fermi trigger No 664738369: Global MASTER-Net observations report
  18. GRB 220117A, GROND observations
  19. AGILE observations of a bright burst from SGR 1935+2154
  20. GRB 220118A: 2.2m CAHA/CAFOS detections
  21. GRB 220118A: COATLI Optical Observations
  22. GRB 220118A: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  23. GRB 220117C: Swift/BAT-GUANO arcminute localization
  24. Swift currently in safe hold with science slews disabled
  25. GRB 220118A: Swift/UVOT Detection
  26. GRB 220118A: GIT optical observations
  27. Swift GRB220118.50: Global MASTER-Net observations report
  28. Swift GRB 220118A: Global MASTER-Net observations report
  29. GRB 220117B: Swift/UVOT Upper Limits
  30. GRB 220117A: Swift/UVOT Upper Limits
  31. GRB 220117A: LCO Optical Observations
  32. GRB 220117A: VLT/X-shooter optical afterglow and redshift
  33. Fermi-LAT Gamma-ray Observations of IceCube-220115A and detection of a new gamma-ray source, Fermi J2350.2+2620
  34. GRB 220117B: Nanshan/NEXT optical upper limit
  35. GRB 220101A: TSHAO optical observation, Terskol, AbAO upper limits
  36. Swift GRB 220117A: Global MASTER-Net observations report
  37. Swift GRB 220117B: Global MASTER-Net observations report
  38. GRB 220117A: Nanshan/NEXT optical observations and a nearby PanSTARRS source
  39. GRB 220101A: The most powerful GRB and BDHN I in 26 years
  40. GECAM observations of a series of bursts from SGR J1935+2154
  41. Fermi trigger No 663960124: Global MASTER-Net observations report
  42. Fermi trigger No 663967527: Global MASTER-Net observations report
  43. Fermi trigger No 663923149: Global MASTER-Net observations report
  44. Fermi trigger No 663899819: Global MASTER-Net observations report
  45. Fermi trigger No 663886592: Global MASTER-Net observations report
  46. Fermi trigger No 663966693: Global MASTER-Net observations report
  47. IceCube Alert 220115.51: Global MASTER-Net observations report
  48. Fermi trigger No 663927396: Global MASTER-Net observations report
  49. Fermi trigger No 663921434: Global MASTER-Net observations report
  50. GRB 210919A: LBT spectroscopic redshift of the host galaxy candidates
  51. GECAM observations of a series of bursts from SGR J1935+2154
  52. Fermi trigger No 663763320: Global MASTER-Net observations report
  53. Fermi trigger No 663710289: Global MASTER-Net observations report
  54. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  55. AGILE observations of a burst from SGR 1935+2154
  56. GECAM observations of a series of bursts from SGR J1935+2154
  57. GRB 220101A: continued 1.3m DFOT optical observations of a high-redshift afterglow
  58. Fermi trigger No 663669570: Global MASTER-Net observations report
  59. Fermi trigger No 663658976: Global MASTER-Net observations report
  60. Fermi trigger No 663618072: Global MASTER-Net observations report
  61. Fermi GRB 220111A: Global MASTER-Net observations report
  62. Konus-Wind detection of GRB 220101A
  63. GRB 220107A: SAO RAS optical observations
  64. Konus-Wind detection of GRB 220107B
  65. Konus-Wind detection of GRB 220107A
  66. GECAM observations of a series of bursts from SGR J1935+2154
  67. GRB 220107A: further SAO RAS optical observations
  68. Fermi trigger No 663406755: Global MASTER-Net observations report
  69. GRB 220107A: SAO RAS optical observations
  70. GRB 220108A: Swift/BAT-GUANO detection outside the coded FOV
  71. GRB 220101A: SAO RAS optical observations
  72. GRB 220107A: AbAO and Terskol optical observations
  73. GRB 220107A: Nanshan/NEXT optical observations
  74. GRB 220107A: Swift/UVOT Detection
  75. GRB 220107B: Fermi GBM observations
  76. GRB 220107B: Swift-XRT afterglow detection
  77. GRB 220107A: Swift-XRT afterglow detection
  78. GRB 220107B: Tiled Swift observations
  79. GRB 220107A: Fermi GBM observations
  80. Fermi trigger No 663274898: Global MASTER-Net observations report
  81. GRB 220107A: Swift ToO observations
  82. Fermi GRB 220107A: Global MASTER-Net observations report
  83. GRB 220107A: Swift/BAT-GUANO arcminute localization
  84. GRB 220101A: Tautenburg observations
  85. GRB 220101A: Continued Mondy optical observations
  86. GRB 220101A: further TNG NIR observations
  87. GRB 220101A: continued 1.3m DFOT Optical Observations
  88. Fermi trigger No 663129379: Global MASTER-Net observations report
  89. GECAM observations of a series of bursts from SGR J1935+2154
  90. GRB 220101A: Mondy optical observations
  91. GRB 220101A: 3rd LCO Optical Observation
  92. GRB 220101A: iTelescope optical observations
  93. GRB 211227A: Lijiang 2.4m Telescope Optical Observations
  94. GRB 220101A: VLA detection
  95. GRB 220101A: 1.3m DFOT observations
  96. GRB 220101A: LCO Continued Optical Observations
  97. Fermi GRB 220104A: Global MASTER-Net observations report
  98. Fermi GRB 220103A: Global MASTER-Net observations report
  99. GRB 211227A: Gemini South Optical Observations
  100. GRB 211229B: Swift/BAT-GUANO detection outside the coded FOV

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