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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"

36195 results found.

  1. Konus-Wind detection of GRB 240513A
  2. GRB 240516A: AstroSat CZTI detection
  3. GRB 240516A: Swift-XRT refined Analysis
  4. GRB 240514E: A possible candidate BD-21 1074
  5. GRB 240516A: Fermi GBM Observation
  6. GRB 240511A: Observations from GTC/OSIRIS+
  7. GRB 240502C: Zeiss-1000 at Koshka observations of GOTO24bao optical counterpart candidate
  8. GRB 240516A: GOTO optical upper limit
  9. LIGO/Virgo/KAGRA S240422ed: GRID non-detection and upper limits
  10. GRB 240516A: Swift detection of a burst
  11. GRB 240514B: AT2024ixa/GOTO24bph is not consistent with the Fermi localisation
  12. GRB 240511A: radio detection of afterglow candidate
  13. GRB 240514B: GOTO candidate optical counterpart
  14. Fermi Gamma-ray Burst Monitor list of triggers that are not a GRB
  15. GRB 240514E: MAXI/GSC detection of a probable afterglow
  16. GRB 240514B: GRBAlpha detection
  17. GRB 240514B: Fermi GBM Detection
  18. GRB 240513A: Fermi GBM observation
  19. GRB 240513A: Swift-XRT observations
  20. GRB 240514D: AstroSat CZTI detection
  21. GRB 240514C: Fermi GBM Final Real-time Localization
  22. Fermi GRB 240514B: Global MASTER-Net observations report
  23. GRB 240514B: Fermi GBM Final Real-time Localization
  24. LIGO/Virgo/KAGRA S240507p: Upper limits from Swift/BAT-GUANO
  25. LIGO/Virgo/KAGRA S240505av: Upper limits from Swift/BAT-GUANO
  26. LIGO/Virgo/KAGRA S240505av: Upper limits from Swift/BAT-GUANO
  27. GRB 240514A: Fermi GBM Final Real-time Localization
  28. GRB 240513A: Tiled Swift observations
  29. GRB 240513A: Fermi-LAT detection
  30. GRB 240511A: Fermi GBM Observation
  31. GRB 240511A: Swift-BAT refined analysis
  32. Fermi GRB 240513B: Global MASTER-Net observations report
  33. GRB 240513B: Fermi GBM Final Real-time Localization
  34. GRB 240513A: AstroSat CZTI detection
  35. GRB 240511A: J-band observations with WINTER
  36. GRB 240511A: Enhanced Swift-XRT position
  37. GRB 240511A : MITSuME Akeno optical upper limits
  38. GRB 240511A: Swift-XRT refined Analysis
  39. GRB 240511A: optical afterglow detection from the NOT
  40. Fermi Gamma-ray Burst Monitor trigger 737102480/240511279 is not a GRB
  41. Fermi Gamma-ray Burst Monitor trigger 737111207/240511380 is not a GRB
  42. Fermi GBM trigger 737105243/240511311 is not a GRB
  43. Fermi GRB 240511A: Global MASTER-Net observations report
  44. Swift GRB 240511A: Global MASTER-Net observations report
  45. Fermi Gamma-ray Burst Monitor trigger 737133200/240511634 is not a GRB
  46. GRB 240511A: Prompt enhanced Swift-XRT position
  47. GRB 240511A: Swift detection of a burst
  48. GRB 240511A: Fermi GBM Final Real-time Localization
  49. Fermi Gamma-ray Burst Monitor trigger 737076431/240510977 is not a GRB
  50. Fermi Gamma-ray Burst Monitor trigger 230925241/717313591 is not a GRB
  51. EP240506a: CrAO ZTSH optical upper limit
  52. GRB 240504A: Fermi GBM Observation
  53. Fermi Gamma-ray Burst Monitor trigger 736837160/240508208 is not a GRB
  54. IPN triangulation of GRB 240504A
  55. GRB 240502A: 1.3m DFOT Optical upper limit
  56. GRB 240504A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  57. GRB 240502C: Zeiss-1000 at Koshka observatory observations of GOTO optical counterpart candidates
  58. IPN triangulation of GRB 240501B and GRB 240501A - possible episodes of ultra long GRB
  59. Fermi GRB 240504A: Global MASTER-Net observations report
  60. GRB 240503A: AstroSat CZTI detection
  61. GRB 240504A: BALROG localization (Fermi Trigger 736492377 / GRB 240504217)
  62. GRB 240504A: Fermi GBM Final Real-time Localization
  63. LXT 240402A / GRB 240402B: VLT X-shooter redshift of host
  64. GRB 240502A: GOTO optical upper limit
  65. GRB 240502A: Fermi GBM Observation
  66. GRB 240415A 1.3m DFOT Optical upper limit
  67. GRB 240502C: GOTO possible optical counterpart candidates
  68. Fermi GRB 240502B: Global MASTER-Net observations report
  69. GRB 240502C: Fermi GBM Final Localization
  70. Fermi GRB 240502A: Global MASTER-Net observations report
  71. GRB 240501B: GRBAlpha detection
  72. GRB 240430A: GRBAlpha detection
  73. GRB 240502B: Fermi GBM Final Real-time Localization
  74. GRB 240502A long GRB detected by INTEGRAL
  75. GRB 240502A: Fermi GBM Final Real-time Localization
  76. Fermi GRB 240501A: Global MASTER-Net observations report
  77. GRB 240426A: VZLUSAT-2 detection
  78. GRB 240425A: VZLUSAT-2 detection
  79. GRB240430A: Fermi GBM Final Localization
  80. GRB 240501B: AstroSat CZTI detection
  81. GRB 240501A: Fermi GBM Final Real-time Localization
  82. GRB 240408B: VZLUSAT-2 detection
  83. GRB 240407A: VZLUSAT-2 detection
  84. X-ray transient EP240414a: Detection of associated supernova
  85. GRB 240425A: GRBAlpha detection
  86. GRB 240429A: Fermi GBM Final Real-time Localization
  87. Fermi GRB 240428A: Global MASTER-Net observations report
  88. GRB 240428A: Fermi GBM Final Real-time Localization
  89. GRB 240426A: AstroSat CZTI detection
  90. EP240426a: YAHPT optical upper limit
  91. GRB 240414A: NOEMA detection
  92. IceCube-240424A: Upper limits from a search for additional neutrino events in IceCube
  93. LIGO/Virgo/KAGRA S240422ed: Upper limits from GECAM Observations
  94. GRB 240425A: Fermi GBM Final Real-time Localization
  95. GRB 240419B: Swift-BAT refined analysis
  96. GRB 240421B: Swift-BAT refined analysis
  97. GRB 240422A: Glowbug gamma-ray detection
  98. IceCube-240424A - IceCube observation of a high-energy neutrino candidate track-like event
  99. GRB 240421B: GRBAlpha detection
  100. IceCube-240419A: Upper limits from a search for additional neutrino events in IceCube

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