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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"

37354 results found.

  1. GRB 240225B: AstroSat CZTI detection
  2. GRB 240225B: Tiled Swift observations
  3. GRB 240225B: MAXI/GSC detection
  4. GRB 240218A: VLA detection
  5. GRB 240225A: Swift/BAT-GUANO detection of a short burst
  6. GRB 240222A: GRBAlpha detection
  7. VLA X-band observation of EPW20240219aa
  8. Transient EPW20240219aa: Mondy optical observations
  9. Transient EPW20240219aa: upper limit in gamma-ray range from SPI-ACS/INTEGRAL observations
  10. Insight-HXMT/HE Sub-Threshold Detection of Transient EPW20240219aa
  11. Swift BAT Sub-Threshold Detection of EPW20240219aa
  12. GRB 240222A: GECAM detection of a burst
  13. GRB 240222A: Swift-BAT refined analysis
  14. GRB 240222A: Swift-XRT refined Analysis
  15. GRB 240222A: Fermi GBM Observation
  16. GRB 240222A: Swift/UVOT Upper Limits
  17. Fermi GBM Sub-Threshold Detection of EPW20240219aa as a likely GRB
  18. Swift GRB 240222A: Global MASTER-Net observations report
  19. Fermi GRB 240222A: Global MASTER-Net observations report
  20. EPW20240219aa is Likely a GRB Event
  21. GRB 240222A: REM optical and NIR early-time observations
  22. GRB 240222A: Swift detection of a burst
  23. GRB 240222A: Fermi GBM Final Real-time Localization
  24. GRB 240218A: MeerLICHT upper limits
  25. GRB 240216A: Glowbug gamma-ray detection
  26. GRB 240215B: Fermi GBM Observation
  27. GRB 240218A: LBT H-band detection
  28. GRB 240218A: Swift-BAT refined analysis
  29. Fermi GRB 240220A: Global MASTER-Net observations report
  30. GRB 240220A: Fermi GBM Final Real-time Localization
  31. Konus-Wind detection of GRB 240218A
  32. GRB 240218A: Swift-XRT refined Analysis
  33. GRB 240218A: VLT/X-shooter redshift of z = 6.782
  34. GRB 240218A: Fermi GBM Detection
  35. GRB 240215A: Fermi GBM Observation
  36. GRB 240216A: GRBAlpha detection
  37. GRB 240215B: GRBAlpha detection
  38. IPN triangulation of GRB 240209A
  39. GRB 240218A: VLT/FORS2 z-band detection
  40. GRB 240218A: Enhanced Swift-XRT position
  41. GRB 240218A: REM detection of a NIR afterglow candidate
  42. GRB 240213A: GRBAlpha detection
  43. GRB 240218A : r-band upper limit from Observatoire de Haute-Provence
  44. GRB240218A: VLT/X-shooter upper limits
  45. GRB 240218A: Swift detection of a burst
  46. GRB 240215C: Fermi GBM Final Real-time Localization
  47. GRB 240215B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  48. Fermi GRB 240216A: Global MASTER-Net observations report
  49. GRB 240216A: Fermi GBM Final Real-time Localization
  50. GRB 240215A: Tiled Swift observations
  51. GRB 240215A: Swift/BAT-GUANO localization of a burst
  52. GRB 240209A: Classification of AT2024cew/GOTO24pw as Type Ia-pec supernova
  53. GRB 240209A: Fermi GBM observation
  54. GRB 240213A: Glowbug gamma-ray detection
  55. GRB240209A: OHP/T193 detection of the GOTO afterglow candidate AT2024cew / GOTO24pw
  56. GRB 240209A: Wendelstein Optical Observations
  57. GRB 240128A: Further Swift-XRT observations
  58. GRB 240214A: Tiled Swift observations
  59. GRB 240214A/1H 0451-560: MAXI/GSC detection
  60. GRB 240213A: BALROG localization (Fermi Trigger / GRB 240213841)
  61. Fermi GRB 240213A: Global MASTER-Net observations report
  62. GRB 240213A: Fermi GBM Final Real-time Localization
  63. GRB 240209A: NOEMA non-detection of AT2024cew / GOTO24pw counterpart candidate
  64. GRB 240209A: NOT photometry of the AT2024cew / GOTO24pw counterpart candidate
  65. GRB 240209A: GOTO optical counterpart candidate
  66. Konus-Wind detection of GRB 240204A
  67. Konus-Wind detection of GRB 240205A (short)
  68. GRB 240209A: Fermi GBM Final Localization
  69. IPN triangulation of GRB 240205A (short)
  70. GRB 240205B: PRIME near infrared detection
  71. GRB 240205A (short): Glowbug gamma-ray detection
  72. GRB240204A: Swift/UVOT Upper Limits
  73. GRB 240205B: AstroSat CZTI detection
  74. GRB 240205B: Swift-BAT refined analysis
  75. Konus-Wind detection of GRB 240205B (long / very soft)
  76. GRB 240207A: Fermi GBM Final Real-time Localization
  77. Konus-Wind detection of GRB 240125A
  78. GRB 240205B: VLT/X-shooter redshift
  79. GRB 240205B: CALET Gamma-Ray Burst Monitor detection
  80. GRB 240205B: BOOTES-6 optical afterglow follow-up
  81. GRB 240205B: ATCA detection of radio counterpart
  82. GRB 240205B: REM detection of the optical/NIR afterglow
  83. GRB 240205B: Fermi GBM Observation
  84. GRB 240204A: AstroSat CZTI detection
  85. GRB 240204A: Mondy optical afterglow observations
  86. GRB 240204A : OHP/T193/T120 optical afterglow fading detection
  87. GRB 240205B: GECAM detection of a long burst
  88. GRB 240204A: Swift-BAT refined analysis
  89. GRB 240205B: Skynet Optical Afterglow Observations
  90. GRB 240205B: BOOTES-7 optical afterglow follow-up
  91. GRB 240205B: MASTER OT J232550.14-550704.6 counterpart detection
  92. GRB 240205B: Swift detection of a burst
  93. GRB 240205B: Fermi GBM Final Real-time Localization
  94. GRB 240204A: Fermi GBM Observation
  95. GRB 240205A: Fermi GBM Final Real-time Localization
  96. GRB 240204a: Liverpool Telescope optical afterglow detection
  97. GRB 240204A: Osservatorio Astronomico Nastro Verde upper limit
  98. Fermi Gamma-ray Burst Monitor trigger 728740048/240204491 is not a GRB
  99. GRB 240204A: optical afterglow detection with LCOGT 1m telescopes at Sutherland and Teide Observatories
  100. GRB 240204A: Montarrenti Observatory optical observations

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