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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"

36317 results found.

  1. GRB 240225B: WINTER near-IR observations and upper limits
  2. GRB 240225B: SAO RAS optical observations
  3. GRB 240226A: GRBAlpha detection
  4. GRB 240225B: Mondy afterglow observations
  5. Fermi GRB 240227A: Global MASTER-Net observations report
  6. GRB 240225B: Liverpool Telescope afterglow observations
  7. Swift J1727.8-1613 (GRB 230824A): Madrona Peak Observatory - optical follow-up
  8. Swift Trigger 1217799 is not a GRB
  9. IPN triangulation of GRB 240227A (short)
  10. GRB 240225B: Liverpool Telescope optical afterglow observations
  11. GRB 240225B: NOT optical observations
  12. GRB 240218A: CMO SAI NIR upper limit
  13. Fermi GRB 240226A: Global MASTER-Net observations report
  14. GRB 240227A: Fermi GBM Final Real-time Localization
  15. Fermi Gamma-ray Burst Monitor trigger 730618809/240226236 is not a GRB
  16. GRB 240225B: Nanshan/HMT optical afterglow detection
  17. GRB 240225B: CALET Gamma-Ray Burst Monitor detection
  18. GRB 240225B: Swift-XRT observations
  19. GRB 240226B: Fermi GBM Final Real-time Localization
  20. GRB 240225C: CALET Gamma-Ray Burst Monitor detection
  21. GRB 240225B: GOTO detection of a candidate optical afterglow
  22. GRB 240226A: Fermi GBM Final Real-time Localization
  23. GRB 240225C: GRBAlpha detection
  24. GRB 240222A: ATCA radio observations
  25. GRB 240225C: AstroSat CZTI detection
  26. GRB 240225B: AstroSat CZTI detection
  27. GRB 240225B: Tiled Swift observations
  28. GRB 240225B: MAXI/GSC detection
  29. GRB 240218A: VLA detection
  30. GRB 240225A: Swift/BAT-GUANO detection of a short burst
  31. GRB 240222A: GRBAlpha detection
  32. VLA X-band observation of EPW20240219aa
  33. Transient EPW20240219aa: Mondy optical observations
  34. Transient EPW20240219aa: upper limit in gamma-ray range from SPI-ACS/INTEGRAL observations
  35. Swift BAT Sub-Threshold Detection of EPW20240219aa
  36. GRB 240222A: GECAM detection of a burst
  37. GRB 240222A: Swift-BAT refined analysis
  38. GRB 240222A: Swift-XRT refined Analysis
  39. GRB 240222A: Fermi GBM Observation
  40. GRB 240222A: Swift/UVOT Upper Limits
  41. Fermi GBM Sub-Threshold Detection of EPW20240219aa as a likely GRB
  42. Swift GRB 240222A: Global MASTER-Net observations report
  43. Fermi GRB 240222A: Global MASTER-Net observations report
  44. EPW20240219aa is Likely a GRB Event
  45. GRB 240222A: REM optical and NIR early-time observations
  46. GRB 240222A: Swift detection of a burst
  47. GRB 240222A: Fermi GBM Final Real-time Localization
  48. GRB 240218A: MeerLICHT upper limits
  49. GRB 240216A: Glowbug gamma-ray detection
  50. GRB 240215B: Fermi GBM Observation
  51. GRB 240218A: LBT H-band detection
  52. GRB 240218A: Swift-BAT refined analysis
  53. Fermi GRB 240220A: Global MASTER-Net observations report
  54. GRB 240220A: Fermi GBM Final Real-time Localization
  55. Konus-Wind detection of GRB 240218A
  56. GRB 240218A: Swift-XRT refined Analysis
  57. GRB 240218A: VLT/X-shooter redshift of z = 6.782
  58. GRB 240218A: Fermi GBM Detection
  59. GRB 240215A: Fermi GBM Observation
  60. GRB 240216A: GRBAlpha detection
  61. GRB 240215B: GRBAlpha detection
  62. IPN triangulation of GRB 240209A
  63. GRB 240218A: VLT/FORS2 z-band detection
  64. GRB 240218A: Enhanced Swift-XRT position
  65. GRB 240218A: REM detection of a NIR afterglow candidate
  66. GRB 240213A: GRBAlpha detection
  67. GRB 240218A : r-band upper limit from Observatoire de Haute-Provence
  68. GRB240218A: VLT/X-shooter upper limits
  69. GRB 240218A: Swift detection of a burst
  70. GRB 240215C: Fermi GBM Final Real-time Localization
  71. GRB 240215B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  72. Fermi GRB 240216A: Global MASTER-Net observations report
  73. GRB 240216A: Fermi GBM Final Real-time Localization
  74. GRB 240215A: Tiled Swift observations
  75. GRB 240215A: Swift/BAT-GUANO localization of a burst
  76. GRB 240209A: Classification of AT2024cew/GOTO24pw as Type Ia-pec supernova
  77. GRB 240209A: Fermi GBM observation
  78. GRB 240213A: Glowbug gamma-ray detection
  79. GRB240209A: OHP/T193 detection of the GOTO afterglow candidate AT2024cew / GOTO24pw
  80. GRB 240209A: Wendelstein Optical Observations
  81. GRB 240128A: Further Swift-XRT observations
  82. GRB 240214A: Tiled Swift observations
  83. GRB 240214A/1H 0451-560: MAXI/GSC detection
  84. GRB 240213A: BALROG localization (Fermi Trigger / GRB 240213841)
  85. Fermi GRB 240213A: Global MASTER-Net observations report
  86. GRB 240213A: Fermi GBM Final Real-time Localization
  87. GRB 240209A: NOEMA non-detection of AT2024cew / GOTO24pw counterpart candidate
  88. GRB 240209A: NOT photometry of the AT2024cew / GOTO24pw counterpart candidate
  89. GRB 240209A: GOTO optical counterpart candidate
  90. Konus-Wind detection of GRB 240204A
  91. Konus-Wind detection of GRB 240205A (short)
  92. GRB 240209A: Fermi GBM Final Localization
  93. Fermi trigger No 729152364: Global MASTER-Net observations report
  94. IPN triangulation of GRB 240205A (short)
  95. GRB 240205B: PRIME near infrared detection
  96. GRB 240205A (short): Glowbug gamma-ray detection
  97. GRB240204A: Swift/UVOT Upper Limits
  98. GRB 240205B: AstroSat CZTI detection
  99. GRB 240205B: Swift-BAT refined analysis
  100. Konus-Wind detection of GRB 240205B (long / very soft)

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