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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"

36397 results found.

  1. GRB 240415A: Fermi GBM Final Real-time Localization
  2. EP240413a: Upper limits from GECAM-B Observation
  3. GRB 240414A: Swift-XRT refined Analysis
  4. GRB240414A : J-band upper limits from WINTER
  5. GRB 240414A: Enhanced Swift-XRT position
  6. GRB 240414A : OHP/T193 second epoch of optical follow-up and afterglow detection
  7. GRB 240414A: MarSEC Observatory, Vicenza, Italy, UPPER LIMIT
  8. GRB 240414A: Skynet Optical Afterglow Observations
  9. Swift GRB 240414A: Global MASTER-Net observations report
  10. IPN triangulation of GRB 240410A
  11. IPN triangulation of GRB 240411A
  12. GRB 240414A : MITSuME Akeno optical upper limits
  13. GRB 240414A: Redshift confirmation from GTC/OSIRIS+
  14. GRB 240414A : OHP/T193 redshift determination
  15. GRB 240414A : OHP/T193 optical counterpart detection
  16. GRB 240414A: Swift detection of a burst
  17. GRB 240411B: CrAO/ZTSh optical observations
  18. GRB 240411B: Kinder observations with Lulin observatory
  19. GRB 240411B: HiPERCAM/GTC observation
  20. GRB 240411B: Swift-BAT refined analysis
  21. GRB 240411B: Swift-XRT refined Analysis
  22. GRB 240411B: 1.3m DFOT Optical observations
  23. GRB 240411A: GRBAlpha detection
  24. GRB 240411B: OHP/T193 optical observations
  25. GRB 240405A: Glowbug gamma-ray detection
  26. GRB 240411B: Enhanced Swift-XRT position
  27. GRB 240411B: LCO optical afterglow detection
  28. GRB 240411B: Swift detection of a burst
  29. GRB 240408B: GRBAlpha detection
  30. GRB 240411A: Fermi GBM Final Real-time Localization
  31. EP240408a: Upper limits from GECAM-B Observation
  32. GRB 240405A: GRBAlpha detection
  33. GRB 240408B: AstroSat CZTI detection
  34. Fermi GRB 240408A: Global MASTER-Net observations report
  35. GRB 240408A: Fermi GBM Final Real-time Localization
  36. GRB 240407A: BALROG localization (Fermi Trigger 734144396 / GRB 240407042)
  37. GRB 240402C: CALET Gamma-Ray Burst Monitor detection
  38. Fermi GRB 240407A: Global MASTER-Net observations report
  39. GRB 240407A: Fermi GBM Final Real-time Localization
  40. LXT 240402A/GRB 240402B: rest-frame energetics from Konus-Wind observation
  41. Fermi GRB 240405B: Global MASTER-Net observations report
  42. GRB 240405B: Fermi GBM Final Real-time Localization
  43. GRB 240402C: Glowbug gamma-ray detection
  44. GRB 240405A: Fermi GBM Final Real-time Localization
  45. GRB 240402C: GRBAlpha detection
  46. GRB 240331A: GRBAlpha detection
  47. LXT 240402A/GRB 240402B: GECAM-C refined analysis
  48. GRB 240403B: Glowbug gamma-ray detection
  49. GRB 240403A: Glowbug gamma-ray detection
  50. LXT 240402A/GRB 240402B: Glowbug gamma-ray detection
  51. Konus-Wind detection of LXT 240402A/GRB 240402B
  52. GRB/FXT 240402B: Kinder optical counterpart candidate
  53. GRB/FXT 240402B: VLT/FORS2 optical afterglow candidate
  54. GRB 240403A: Fermi GBM Detection
  55. LXT 240402A: EP-FXT detection of the X-ray afterglow
  56. Fermi GRB 240404A: Global MASTER-Net observations report
  57. GRB 240404A: Fermi GBM Final Real-time Localization
  58. GRB 240402B: GWAC-F50A optical upper limit
  59. GRB 240402B: GECAM-C detection
  60. GRB 240403A: BALROG localization (Fermi Trigger 733838255 / GRB 240403498)
  61. Fermi GRB 240402A: Global MASTER-Net observations report
  62. GRB 240402A: Fermi GBM Final Real-time Localization
  63. IBAS Alert n.10651 not a GRB
  64. IceCube-240327B: Upper limits from a search for additional neutrino events in IceCube
  65. IceCube-240327A: Upper limits from a search for additional neutrino events in IceCube
  66. GRB 240329A: Glowbug gamma-ray detection
  67. GRB 240324A: AstroSat CZTI detection of a short burst
  68. GRB 240331A: AstroSat CZTI detection
  69. GRB 240329A: AstroSat CZTI detection
  70. GRB 240331A: Fermi GBM Final Real-time Localization
  71. GRB 240329A: GRBAlpha detection
  72. Fermi GRB 240329A: Global MASTER-Net observations report
  73. GRB 240329A: BALROG localization (Fermi Trigger 733441392 / GRB 240329905)
  74. GRB 240329A: Fermi GBM Final Real-time Localization
  75. Fermi GRB 240328B: Global MASTER-Net observations report
  76. Fermi GRB 240328A: Global MASTER-Net observations report
  77. GRB 240328C: Glowbug gamma-ray detection
  78. GRB 240328B: Fermi GBM Final Real-time Localization
  79. GRB 240328A: Fermi GBM Final Real-time Localization
  80. X-ray transient EP 240315a: Second epoch Chandra observations
  81. GRB 240320A: Glowbug gamma-ray detection
  82. GRB 240318A: Fermi GBM Observation
  83. Fermi GRB 240320A: Global MASTER-Net observations report
  84. Konus-Wind detection of GRB 240315C (possible counterpart of EP240315a)
  85. GRB 240315C / X-ray transient EP240315a: Swift/BAT detection
  86. GRB 240318A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  87. GRB 240320A: Fermi GBM Final Real-time Localization
  88. IPN triangulation of GRB 240315C (consistent with a fast X-ray transient EP240315a)
  89. GRB 240317B: Swift/BAT-GUANO Angular Error Correction
  90. Fermi Gamma-ray Burst Monitor trigger 732299243/240316686 is not a GRB
  91. GRB 240318A: Glowbug gamma-ray detection
  92. GRB 240317C: Glowbug gamma-ray detection
  93. GRB 240318B: Glowbug gamma-ray detection
  94. GRB 240317B: Fermi GBM Observation
  95. X-ray transient EP240315a/AT2024eju: TShAO (Zeiss-1000) observatory optical upper limit
  96. Fermi GRB 240318A: Global MASTER-Net observations report
  97. GRB 240318A: Fermi GBM Final Real-time Localization
  98. GRB 240317B: Swift/BAT-GUANO arcminute localization of a burst
  99. GRB 240317A: AstroSat CZTI detection
  100. GRB 240315B: AstroSat CZTI detection

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