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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"

39456 results found.

  1. Swift GRB 220117A: Global MASTER-Net observations report
  2. Swift GRB 220117B: Global MASTER-Net observations report
  3. GRB 220117B: Swift detection of a burst
  4. GRB 220117A: Nanshan/NEXT optical observations and a nearby PanSTARRS source
  5. GRB 220117A: Swift detection of a burst
  6. GRB 220101A: The most powerful GRB and BDHN I in 26 years
  7. Fermi trigger No 663960124: Global MASTER-Net observations report
  8. Fermi trigger No 663967527: Global MASTER-Net observations report
  9. Fermi trigger No 663923149: Global MASTER-Net observations report
  10. Fermi trigger No 663899819: Global MASTER-Net observations report
  11. Fermi trigger No 663886592: Global MASTER-Net observations report
  12. Fermi trigger No 663966693: Global MASTER-Net observations report
  13. GRB 220115B: Fermi GBM Final Real-time Localization
  14. IceCube Alert 220115.51: Global MASTER-Net observations report
  15. Fermi trigger No 663927396: Global MASTER-Net observations report
  16. Fermi trigger No 663921434: Global MASTER-Net observations report
  17. GRB 210919A: LBT spectroscopic redshift of the host galaxy candidates
  18. GRB 220115A: Fermi GBM Final Real-time Localization
  19. Fermi Gamma-ray Burst Monitor trigger 663917434/220115230 is not a GRB
  20. GRB 220114A: Fermi GBM Final Localization
  21. Fermi trigger No 663763320: Global MASTER-Net observations report
  22. Fermi trigger No 663710289: Global MASTER-Net observations report
  23. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  24. GRB 220101A: continued 1.3m DFOT optical observations of a high-redshift afterglow
  25. Fermi trigger No 663669570: Global MASTER-Net observations report
  26. GRB 220111A: AstroSat CZTI detection
  27. Fermi trigger No 663658976: Global MASTER-Net observations report
  28. Fermi trigger No 663618072: Global MASTER-Net observations report
  29. Fermi GRB 220111A: Global MASTER-Net observations report
  30. Konus-Wind detection of GRB 220101A (correction to GCN 31433)
  31. GRB 220111A: BALROG localization (Fermi Trigger 663621714 / GRB 220111807)
  32. GRB 220111A: Fermi GBM Final Real-time Localization
  33. Konus-Wind detection of GRB 220101A
  34. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB
  35. GRB 220107A: SAO RAS optical observations
  36. Konus-Wind detection of GRB 220107B
  37. Konus-Wind detection of GRB 220107A
  38. Confirmation of the X-ray afterglow of GRB 220107B
  39. GRB 220107A: further SAO RAS optical observations
  40. GRB 220101A: Additional Liverpool telescope photometry
  41. Fermi trigger No 663406755: Global MASTER-Net observations report
  42. GRB 220107A: 6m BTA spectroscopic redshift
  43. GRB 220107A: SAO RAS optical observations
  44. GRB 220108A: Swift/BAT-GUANO detection outside the coded FOV
  45. GRB 220101A: SAO RAS optical observations
  46. GRB 220107A: AbAO and Terskol optical observations
  47. GRB 220107B: MITSuME Akeno optical upper limits
  48. GRB 220107B: Nanshan/NEXT optical upper limits and host galaxy candidate
  49. GRB 220107A: Nanshan/NEXT optical observations
  50. GRB 220107A: Swift/UVOT Detection
  51. GRB 220107B: Fermi GBM observations
  52. GRB 220107A: MITSuME Akeno optical observation
  53. GRB 220107B: AstroSat CZTI detection
  54. GRB 220107B: Swift-XRT afterglow detection
  55. GRB 220107A: Swift-XRT afterglow detection
  56. GRB 220107B: Fermi-LAT detection
  57. GRB 220107A: AstroSat CZTI detection
  58. GRB 220107B: Tiled Swift observations
  59. GRB 220107A: Fermi GBM observations
  60. Fermi trigger No 663274898: Global MASTER-Net observations report
  61. GRB 220107A: Swift ToO observations
  62. Fermi GRB 220107A: Global MASTER-Net observations report
  63. GRB 220107A: Swift/BAT-GUANO arcminute localization
  64. GRB 220101A: Tautenburg observations
  65. GRB 220107A: BALROG localization (Fermi Trigger 663259536 / GRB 220107615)
  66. GRB 220107A: Fermi GBM Final Real-time Localization
  67. GRB 220101A: Continued Mondy optical observations
  68. GRB 220101A: further TNG NIR observations
  69. GRB 220101A: continued 1.3m DFOT Optical Observations
  70. Fermi trigger No 663129379: Global MASTER-Net observations report
  71. GRB 220104A: Fermi GBM Observation
  72. GRB 220101A: Mondy optical observations
  73. GRB 220101A: 3rd LCO Optical Observation
  74. GRB 220101A: 2.2m CAHA (+CAFOS) first day optical detection
  75. GRB 220101A: iTelescope optical observations
  76. GRB 211227A: Lijiang 2.4m Telescope Optical Observations
  77. GRB 220101A: VLA detection
  78. GRB 220101A: 1.3m DFOT observations
  79. GRB 220101A: LCO Continued Optical Observations
  80. GRB 220104A：GECAM detection
  81. Fermi GRB 220104A: Global MASTER-Net observations report
  82. GRB 220104A: Fermi GBM Final Real-time Localization
  83. GRB 211229B: Fermi GBM observation
  84. Fermi GRB 220103A: Global MASTER-Net observations report
  85. GRB 220103A: Fermi GBM Final Real-time Localization
  86. GRB 211227A: Gemini South Optical Observations
  87. GRB 211229B: Swift/BAT-GUANO detection outside the coded FOV
  88. GRB 220101A: TNG NIR afterglow detection
  89. GRB 220101A: ALMA detection
  90. GRB 220101A: LCO Optical Observations
  91. GRB 220101A: Tautenburg observations
  92. GRB 220101A: Swift-BAT refined analysis
  93. GRB 220101A: GMG observation (2nd epoch)
  94. GRB 211231A: AstroSat CZTI detection
  95. GRB 220101A: OASDG optical observations
  96. GRB 220101A : Eiso equals the maximum isotropic GRB energy
  97. GRB 220101A: GMG observation
  98. GRB 220101A: Asiago spectroscopic and photometric detection
  99. Fermi trigger No 662768315: Global MASTER-Net observations report
  100. GRB 220101A: Fermi GBM Detection

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