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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"

36162 results found.

  1. Improved IPN triangulation of GRB 240227A (short)
  2. IPN triangulation of GRB 240229A
  3. GRB 240305A: Fermi GBM Final Real-time Localization
  4. Konus-Wind detection of GRB 240303B
  5. IPN triangulation of GRB 240303B
  6. GRB 240303B: Fermi GBM Detection
  7. GRB 240225B: Swift-XRT afterglow detection
  8. Swift detection of Swift J151857.0-572147
  9. GRB 240303B: CALET Gamma-Ray Burst Monitor detection
  10. GRB 240303C: BALROG localization (Fermi Trigger 731189113 / GRB 240303837)
  11. Swift GRB 240303A: Global MASTER-Net observations report
  12. Swift J151857.0-572147: Confirmation of a new galactic transient
  13. GRB 240215A: Swift-XRT afterglow detection
  14. GRB 240303B: BALROG localization (Fermi Trigger 731161136 / GRB 240303513)
  15. GRB 240303B: Fermi GBM Final Localization
  16. GRB 240303A: Swift detection of a burst
  17. GRB 240225B: Glowbug gamma-ray detection
  18. GRB 240225C: Glowbug gamma-ray detection
  19. GRB 240225A (short): Glowbug gamma-ray detection
  20. GRB 240229A: DDOTI Upper Limits on the Afterglow
  21. GRB 240218A: NOEMA upper limit
  22. GRB 240229A: CALET Gamma-Ray Burst Monitor detection
  23. GRB 240225B: further SAO RAS optical observations
  24. Fermi GRB 240229A: Global MASTER-Net observations report
  25. GRB 240225B: Swift ToO observations
  26. Konus-Wind detection of GRB 240225B (long)
  27. GRB 240229A: BALROG localization (Fermi Trigger 730908432 / GRB 240229588)
  28. GRB 240229A: Fermi GBM Final Real-time Localization
  29. GRB 240225B: VLT/X-shooter redshift
  30. GRB 240225B : MITSuME Akeno optical afterglow candidate detection
  31. GRB 240225B: 3.6m DOT observation
  32. GRB 240225B: WINTER near-IR observations and upper limits
  33. GRB 240225B: SAO RAS optical observations
  34. GRB 240226A: GRBAlpha detection
  35. GRB 240225B: Mondy afterglow observations
  36. Fermi GRB 240227A: Global MASTER-Net observations report
  37. GRB 240225B: Liverpool Telescope afterglow observations
  38. Swift J1727.8-1613 (GRB 230824A): Madrona Peak Observatory - optical follow-up
  39. Swift Trigger 1217799 is not a GRB
  40. IPN triangulation of GRB 240227A (short)
  41. GRB 240225B: Liverpool Telescope optical afterglow observations
  42. GRB 240225B: NOT optical observations
  43. GRB 240218A: CMO SAI NIR upper limit
  44. Fermi GRB 240226A: Global MASTER-Net observations report
  45. GRB 240227A: Fermi GBM Final Real-time Localization
  46. Fermi Gamma-ray Burst Monitor trigger 730618809/240226236 is not a GRB
  47. GRB 240225B: Nanshan/HMT optical afterglow detection
  48. GRB 240225B: CALET Gamma-Ray Burst Monitor detection
  49. GRB 240225B: Swift-XRT observations
  50. GRB 240226B: Fermi GBM Final Real-time Localization
  51. GRB 240225C: CALET Gamma-Ray Burst Monitor detection
  52. GRB 240225B: GOTO detection of a candidate optical afterglow
  53. GRB 240226A: Fermi GBM Final Real-time Localization
  54. GRB 240225C: GRBAlpha detection
  55. GRB 240222A: ATCA radio observations
  56. GRB 240225C: AstroSat CZTI detection
  57. GRB 240225B: AstroSat CZTI detection
  58. GRB 240225B: Tiled Swift observations
  59. GRB 240225B: MAXI/GSC detection
  60. GRB 240218A: VLA detection
  61. GRB 240225A: Swift/BAT-GUANO detection of a short burst
  62. GRB 240222A: GRBAlpha detection
  63. VLA X-band observation of EPW20240219aa
  64. Transient EPW20240219aa: Mondy optical observations
  65. Transient EPW20240219aa: upper limit in gamma-ray range from SPI-ACS/INTEGRAL observations
  66. Swift BAT Sub-Threshold Detection of EPW20240219aa
  67. GRB 240222A: GECAM detection of a burst
  68. GRB 240222A: Swift-BAT refined analysis
  69. GRB 240222A: Swift-XRT refined Analysis
  70. GRB 240222A: Fermi GBM Observation
  71. GRB 240222A: Swift/UVOT Upper Limits
  72. Fermi GBM Sub-Threshold Detection of EPW20240219aa as a likely GRB
  73. Swift GRB 240222A: Global MASTER-Net observations report
  74. Fermi GRB 240222A: Global MASTER-Net observations report
  75. EPW20240219aa is Likely a GRB Event
  76. GRB 240222A: REM optical and NIR early-time observations
  77. GRB 240222A: Swift detection of a burst
  78. GRB 240222A: Fermi GBM Final Real-time Localization
  79. GRB 240218A: MeerLICHT upper limits
  80. GRB 240216A: Glowbug gamma-ray detection
  81. GRB 240215B: Fermi GBM Observation
  82. GRB 240218A: LBT H-band detection
  83. GRB 240218A: Swift-BAT refined analysis
  84. Fermi GRB 240220A: Global MASTER-Net observations report
  85. GRB 240220A: Fermi GBM Final Real-time Localization
  86. Konus-Wind detection of GRB 240218A
  87. GRB 240218A: Swift-XRT refined Analysis
  88. GRB 240218A: VLT/X-shooter redshift of z = 6.782
  89. GRB 240218A: Fermi GBM Detection
  90. GRB 240215A: Fermi GBM Observation
  91. GRB 240216A: GRBAlpha detection
  92. GRB 240215B: GRBAlpha detection
  93. IPN triangulation of GRB 240209A
  94. GRB 240218A: VLT/FORS2 z-band detection
  95. GRB 240218A: Enhanced Swift-XRT position
  96. GRB 240218A: REM detection of a NIR afterglow candidate
  97. GRB 240213A: GRBAlpha detection
  98. GRB 240218A : r-band upper limit from Observatoire de Haute-Provence
  99. GRB240218A: VLT/X-shooter upper limits
  100. GRB 240218A: Swift detection of a burst

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