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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"

37715 results found.

  1. GRB 240226A: Fermi GBM Final Real-time Localization
  2. GRB 240225C: GRBAlpha detection
  3. GRB 240222A: ATCA radio observations
  4. Fermi trigger No 730618809: Global MASTER-Net observations report
  5. GRB 240225C: AstroSat CZTI detection
  6. GRB 240225B: AstroSat CZTI detection
  7. GRB 240225B: Tiled Swift observations
  8. GRB 240225B: MAXI/GSC detection
  9. Transient EPW20240219aa: Xinglong-2.16m optical upper limit
  10. GRB 240218A: VLA detection
  11. GRB 240225A: Swift/BAT-GUANO detection of a short burst
  12. GRB 240222A: GRBAlpha detection
  13. VLA X-band observation of EPW20240219aa
  14. Transient EPW20240219aa: Mondy optical observations
  15. Transient EPW20240219aa: upper limit in gamma-ray range from SPI-ACS/INTEGRAL observations
  16. Insight-HXMT/HE Sub-Threshold Detection of Transient EPW20240219aa
  17. Swift BAT Sub-Threshold Detection of EPW20240219aa
  18. GRB 240222A: GECAM detection of a burst
  19. GRB 240222A: Swift-BAT refined analysis
  20. GRB 240222A: Swift-XRT refined Analysis
  21. GRB 240222A: Fermi GBM Observation
  22. GRB 240222A: Swift/UVOT Upper Limits
  23. Fermi GBM Sub-Threshold Detection of EPW20240219aa as a likely GRB
  24. Swift GRB 240222A: Global MASTER-Net observations report
  25. Fermi GRB 240222A: Global MASTER-Net observations report
  26. EPW20240219aa is Likely a GRB Event
  27. GRB 240222A: REM optical and NIR early-time observations
  28. GRB 240222A: Swift detection of a burst
  29. GRB 240222A: Fermi GBM Final Real-time Localization
  30. GRB 240218A: MeerLICHT upper limits
  31. GRB 240216A: Glowbug gamma-ray detection
  32. GRB 240215B: Fermi GBM Observation
  33. GRB 240218A: LBT H-band detection
  34. GRB 240218A: Swift-BAT refined analysis
  35. Fermi GRB 240220A: Global MASTER-Net observations report
  36. GRB 240220A: Fermi GBM Final Real-time Localization
  37. Konus-Wind detection of GRB 240218A
  38. GRB 240218A: Swift-XRT refined Analysis
  39. GRB 240218A: VLT/X-shooter redshift of z = 6.782
  40. GRB 240218A: Fermi GBM Detection
  41. GRB 240215A: Fermi GBM Observation
  42. GRB 240216A: GRBAlpha detection
  43. GRB 240215B: GRBAlpha detection
  44. IPN triangulation of GRB 240209A
  45. Fermi trigger No 729914426: Global MASTER-Net observations report
  46. GRB 240218A: VLT/FORS2 z-band detection
  47. GRB 240218A: Enhanced Swift-XRT position
  48. GRB 240218A: REM detection of a NIR afterglow candidate
  49. Gamma-ray flaring activity from the blazar 1ES 1959+650 observed by the Fermi-LAT
  50. GRB 240213A: GRBAlpha detection
  51. GRB 240218A : r-band upper limit from Observatoire de Haute-Provence
  52. GRB240218A: VLT/X-shooter upper limits
  53. GRB 240218A: Swift detection of a burst
  54. GRB 240215C: Fermi GBM Final Real-time Localization
  55. GRB 240215B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  56. Fermi GRB 240216A: Global MASTER-Net observations report
  57. GRB 240216A: Fermi GBM Final Real-time Localization
  58. Fermi trigger No 729719508: Global MASTER-Net observations report
  59. GRB 240215A: Tiled Swift observations
  60. GRB 240215A: Swift/BAT-GUANO localization of a burst
  61. Fermi trigger No 729703985: Global MASTER-Net observations report
  62. Fermi trigger No 729650855: Global MASTER-Net observations report
  63. GRB 240209A: Classification of AT2024cew/GOTO24pw as Type Ia-pec supernova
  64. GRB 240209A: Fermi GBM observation
  65. GRB 240213A: Glowbug gamma-ray detection
  66. GRB240209A: OHP/T193 detection of the GOTO afterglow candidate AT2024cew / GOTO24pw
  67. GRB 240209A: Wendelstein Optical Observations
  68. GRB 240128A: Further Swift-XRT observations
  69. GRB 240214A: Tiled Swift observations
  70. GRB 240214A/1H 0451-560: MAXI/GSC detection
  71. GRB 240213A: BALROG localization (Fermi Trigger / GRB 240213841)
  72. Fermi GRB 240213A: Global MASTER-Net observations report
  73. GRB 240213A: Fermi GBM Final Real-time Localization
  74. GRB 240209A: NOEMA non-detection of AT2024cew / GOTO24pw counterpart candidate
  75. GRB 240209A: NOT photometry of the AT2024cew / GOTO24pw counterpart candidate
  76. GRB 240209A: GOTO optical counterpart candidate
  77. Konus-Wind detection of GRB 240204A
  78. Konus-Wind detection of GRB 240205A (short)
  79. GRB 240209A: Fermi GBM Final Localization
  80. Fermi trigger No 729152364: Global MASTER-Net observations report
  81. IPN triangulation of GRB 240205A (short)
  82. Fermi-LAT gamma-ray observations of IceCube-240204A
  83. GRB 240205B: PRIME near infrared detection
  84. GRB 240205A (short): Glowbug gamma-ray detection
  85. GRB240204A: Swift/UVOT Upper Limits
  86. GRB 240205B: AstroSat CZTI detection
  87. Fermi trigger No 729012023: Global MASTER-Net observations report
  88. GRB 240205B: Swift-BAT refined analysis
  89. Konus-Wind detection of GRB 240205B (long / very soft)
  90. GRB 240207A: Fermi GBM Final Real-time Localization
  91. Konus-Wind detection of GRB 240125A
  92. GRB 240205B: VLT/X-shooter redshift
  93. GRB 240205B: CALET Gamma-Ray Burst Monitor detection
  94. GRB 240205B: BOOTES-6 optical afterglow follow-up
  95. GRB 240205B: ATCA detection of radio counterpart
  96. GRB 240205B: REM detection of the optical/NIR afterglow
  97. GRB 240205B: Fermi GBM Observation
  98. GRB 240204A: AstroSat CZTI detection
  99. GRB 240204A: Mondy optical afterglow observations
  100. GRB 240204A : OHP/T193/T120 optical afterglow fading detection

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