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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

36796 results found.

  1. GRB 240615A: Fermi GBM Final Real-time Localization
  2. GRB 240603A: VZLUSAT-2 detection
  3. GRB 240612A: GRBAlpha detection
  4. GRB 240613A: Fermi GBM Final Real-time Localization
  5. Fermi GRB 240612B: Global MASTER-Net observations report
  6. Fermi GRB 240612A: Global MASTER-Net observations report
  7. GRB 240612B: Fermi GBM Final Real-time Localization
  8. GRB 240612A: Fermi GBM Final Real-time Localization
  9. GRB 240607A: GECAM detection of a bright long burst
  10. Fermi GRB 240611A: Global MASTER-Net observations report
  11. Konus-Wind detection of GRB 240607A
  12. GRB 240611A: Fermi GBM Final Real-time Localization
  13. GRB 240529A: LBT optical detection and late temporal decay
  14. GRB 240529A : MITSuME Akeno optical afterglow detection
  15. Fermi GRB 240610A: Global MASTER-Net observations report
  16. GRB 240610A: Fermi GBM Final Real-time Localization
  17. IPN triangulation of GRB 240607A
  18. Fermi Gamma-ray Burst Monitor trigger 739632045/240609556 is not a GRB
  19. Fermi trigger No 739632045: Global MASTER-Net observations report
  20. Fermi GRB 240608A: Global MASTER-Net observations report
  21. Konus-Wind detection of GRB 240606B
  22. Fermi trigger No 739506569: Global MASTER-Net observations report
  23. GRB 240608A: Fermi GBM Final Real-time Localization
  24. Fermi GRB 240607A: Global MASTER-Net observations report
  25. GRB 240529A: NOEMA detection
  26. GRB 240607A: Fermi GBM Observation
  27. GRB 240606B: Fermi GBM Observation
  28. Swift Trigger 1235109: consistent with noise and not astrophysical
  29. GRB 240607A: AstroSat CZTI detection of bright long burst
  30. GRB 240607A: Fermi GBM detection of a very bright burst
  31. GRB 240529A: radio detection with AMI-LA
  32. GRB 240607A: BALROG localization (Fermi Trigger 739450879 / GRB 240607459)
  33. GRB 240607A: Fermi GBM Final Real-time Localization
  34. GRB 240606B: GECAM-B detection a long burst
  35. Fermi trigger No 739373591: Global MASTER-Net observations report
  36. GRB 240606B: Swift-XRT afterglow detection
  37. GRB 240606B: Swift ToO observations
  38. GRB 240606B: Swift/BAT-GUANO arcminute localization of a burst
  39. Konus-Wind detection of GRB 240603A
  40. Swift Trigger 1235109: a possible GRB 240606A
  41. Fermi GRB 240604A: Global MASTER-Net observations report
  42. IPN triangulation of GRB 240531A (short)
  43. Fermi GRB 240605A: Global MASTER-Net observations report
  44. Fermi GRB 240605C: Global MASTER-Net observations report
  45. Fermi Gamma-ray Burst Monitor trigger 739290883/240605607 is not a GRB
  46. GRB 240605C: Fermi GBM Final Real-time Localization
  47. IPN triangulation of GRB 240603A
  48. GRB 240605B: Fermi GBM Final Real-time Localization
  49. GRB 240604A: Fermi GBM Final Localization
  50. GRB 240605A: Fermi GBM Final Real-time Localization
  51. GRB 240604A: GECAM detection of a long burst
  52. GRB 240529A: SAO RAS optical observations
  53. Swift Trigger 1232755: likely consistent with noise and not astrophysical
  54. Fermi GRB 240603C: Global MASTER-Net observations report
  55. LIGO/Virgo/KAGRA S240601co: Upper limits from Swift/BAT-GUANO
  56. LIGO/Virgo/KAGRA S240530a: Upper limits from Swift/BAT-GUANO
  57. GRB 240603A: Fermi GBM Final Localization
  58. GRB 240603C: BALROG localization (Fermi Trigger 739102156 / GRB 240603423)
  59. GRB 240603C: Fermi GBM Final Real-time Localization
  60. GRB 240603B: Swift detection of a possible burst
  61. GRB 240529A: MASTER prompt OT detection
  62. GRB 240603A: GECAM detection of a short burst
  63. GRB 240529A: continued SAO RAS optical observations
  64. Fermi GRB 240602A: Global MASTER-Net observations report
  65. GRB 240529A: OSN optical detection
  66. GRB 240529A: further SAO RAS optical observations
  67. GRB 240602A: Fermi GBM Final Real-time Localization
  68. Swift Trigger 1232465 is not a GRB
  69. GRB 240529A: AKO Optical Afterglow Follow-Up Observations
  70. GRB 240529A: 1.3m DFOT Optical observations
  71. GRB 240531A: AstroSat CZTI detection of a short burst
  72. GRB 240529A : Mondy optical observations
  73. Konus-Wind detection of GRB 240529A
  74. IPN triangulation of the initial episode of GRB 240529A
  75. GRB 240529A: SAO RAS optical observations
  76. GRB 240529A: MAAO 0.7m telescope optical afterglow detection
  77. GRB 240529A: Insight-HXMT/HE detection
  78. GRB 240529A: optical photometry from Konkoly
  79. GRB 240529A: GROWTH-India optical follow-up
  80. GRB 240529A: T193/MISTRAL observations
  81. GRB 240529A: Redshift from GTC/OSIRIS+
  82. GRB 240529A: AKO Optical Afterglow Detection
  83. LIGO/Virgo/KAGRA S240527fv: Upper limits from Swift/BAT-GUANO
  84. LIGO/Virgo/KAGRA S240525p: Upper limits from Swift/BAT-GUANO
  85. GRB 240529A: J-band detections with WINTER
  86. GRB 240529A: Skynet Optical Observations
  87. GRB 240529A: Swift-BAT refined analysis
  88. GRB 240529A: Swift-XRT refined Analysis
  89. GRB240529A: BOOTES-6/DPRT optical detection
  90. GRB 240529A: Swift/UVOT Detection
  91. GRB 240529A: NOT optical observations
  92. GRB 240529A: AstroSat CZTI detection
  93. GRB 240529A: GOTO optical afterglow detection
  94. GRB 240527B: Swift-XRT afterglow detection
  95. GRB 240529A: Enhanced Swift-XRT position
  96. GRB 240529A: Swift detection of a burst with an optical counterpart
  97. GRB 240527B: Fermi GBM Observation
  98. Fermi GRB 240527A: Global MASTER-Net observations report
  99. GRB 240527B: Fermi-LAT detection
  100. Fermi GRB 240527B: Global MASTER-Net observations report

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