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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"

36208 results found.

  1. GRB 240529A : MITSuME Akeno optical afterglow detection
  2. Fermi GRB 240610A: Global MASTER-Net observations report
  3. GRB 240610A: Fermi GBM Final Real-time Localization
  4. IPN triangulation of GRB 240607A
  5. Fermi Gamma-ray Burst Monitor trigger 739632045/240609556 is not a GRB
  6. Fermi GRB 240608A: Global MASTER-Net observations report
  7. Konus-Wind detection of GRB 240606B
  8. GRB 240608A: Fermi GBM Final Real-time Localization
  9. Fermi GRB 240607A: Global MASTER-Net observations report
  10. GRB 240529A: NOEMA detection
  11. GRB 240607A: Fermi GBM Observation
  12. GRB 240606B: Fermi GBM Observation
  13. Swift Trigger 1235109: consistent with noise and not astrophysical
  14. GRB 240607A: AstroSat CZTI detection of bright long burst
  15. GRB 240607A: Fermi GBM detection of a very bright burst
  16. GRB 240529A: radio detection with AMI-LA
  17. GRB 240607A: BALROG localization (Fermi Trigger 739450879 / GRB 240607459)
  18. GRB 240607A: Fermi GBM Final Real-time Localization
  19. GRB 240606B: GECAM-B detection a long burst
  20. GRB 240606B: Swift-XRT afterglow detection
  21. GRB 240606B: Swift ToO observations
  22. GRB 240606B: Swift/BAT-GUANO arcminute localization of a burst
  23. Konus-Wind detection of GRB 240603A
  24. Swift Trigger 1235109: a possible GRB 240606A
  25. Fermi GRB 240604A: Global MASTER-Net observations report
  26. IPN triangulation of GRB 240531A (short)
  27. Fermi GRB 240605A: Global MASTER-Net observations report
  28. Fermi GRB 240605C: Global MASTER-Net observations report
  29. Fermi Gamma-ray Burst Monitor trigger 739290883/240605607 is not a GRB
  30. GRB 240605C: Fermi GBM Final Real-time Localization
  31. IPN triangulation of GRB 240603A
  32. GRB 240605B: Fermi GBM Final Real-time Localization
  33. GRB 240604A: Fermi GBM Final Localization
  34. GRB 240605A: Fermi GBM Final Real-time Localization
  35. GRB 240604A: GECAM detection of a long burst
  36. GRB 240529A: SAO RAS optical observations
  37. Swift Trigger 1232755: likely consistent with noise and not astrophysical
  38. Fermi GRB 240603C: Global MASTER-Net observations report
  39. LIGO/Virgo/KAGRA S240601co: Upper limits from Swift/BAT-GUANO
  40. LIGO/Virgo/KAGRA S240530a: Upper limits from Swift/BAT-GUANO
  41. GRB 240603A: Fermi GBM Final Localization
  42. GRB 240603C: BALROG localization (Fermi Trigger 739102156 / GRB 240603423)
  43. GRB 240603C: Fermi GBM Final Real-time Localization
  44. GRB 240603B: Swift detection of a possible burst
  45. GRB 240529A: MASTER prompt OT detection
  46. GRB 240603A: GECAM detection of a short burst
  47. GRB 240529A: continued SAO RAS optical observations
  48. Fermi GRB 240602A: Global MASTER-Net observations report
  49. GRB 240529A: OSN optical detection
  50. GRB 240529A: further SAO RAS optical observations
  51. GRB 240602A: Fermi GBM Final Real-time Localization
  52. Swift Trigger 1232465 is not a GRB
  53. GRB 240529A: AKO Optical Afterglow Follow-Up Observations
  54. GRB 240529A: 1.3m DFOT Optical observations
  55. GRB 240531A: AstroSat CZTI detection of a short burst
  56. GRB 240529A : Mondy optical observations
  57. Konus-Wind detection of GRB 240529A
  58. IPN triangulation of the initial episode of GRB 240529A
  59. GRB 240529A: SAO RAS optical observations
  60. GRB 240529A: MAAO 0.7m telescope optical afterglow detection
  61. GRB 240529A: Insight-HXMT/HE detection
  62. GRB 240529A: optical photometry from Konkoly
  63. GRB 240529A: GROWTH-India optical follow-up
  64. GRB 240529A: T193/MISTRAL observations
  65. GRB 240529A: Redshift from GTC/OSIRIS+
  66. GRB 240529A: AKO Optical Afterglow Detection
  67. LIGO/Virgo/KAGRA S240527fv: Upper limits from Swift/BAT-GUANO
  68. LIGO/Virgo/KAGRA S240525p: Upper limits from Swift/BAT-GUANO
  69. GRB 240529A: J-band detections with WINTER
  70. GRB 240529A: Skynet Optical Observations
  71. GRB 240529A: Swift-BAT refined analysis
  72. GRB 240529A: Swift-XRT refined Analysis
  73. GRB240529A: BOOTES-6/DPRT optical detection
  74. GRB 240529A: Swift/UVOT Detection
  75. GRB 240529A: NOT optical observations
  76. GRB 240529A: AstroSat CZTI detection
  77. GRB 240529A: GOTO optical afterglow detection
  78. GRB 240527B: Swift-XRT afterglow detection
  79. GRB 240529A: Enhanced Swift-XRT position
  80. GRB 240529A: Swift detection of a burst with an optical counterpart
  81. GRB 240527B: Fermi GBM Observation
  82. Fermi GRB 240527A: Global MASTER-Net observations report
  83. GRB 240527B: Fermi-LAT detection
  84. Fermi GRB 240527B: Global MASTER-Net observations report
  85. GRB 240527B: Fermi GBM Final Localization
  86. GRB 240527B: BALROG localization (Fermi Trigger 738511436 / GRB 240527586)
  87. GRB 240527A: Fermi GBM Final Real-time Localization
  88. GRB 240523A: Swift-BAT refined analysis
  89. GRB 240523A: Swift-XRT refined Analysis
  90. GRB 240523A: Enhanced Swift-XRT position
  91. GRB 240523A: Swift detection of a burst
  92. GRB 240521B: Fermi GBM Observation
  93. Fermi GBM Sub-Threshold Detection of GRB 240516B
  94. GRB 240513A: Swift-XRT afterglow detection
  95. GRB 240521B: Swift/BAT-GUANO arcminute localization of a long burst
  96. GRB 240521A: GECAM-B detection of a long burst
  97. GRB 240516B: AstroSat CZTI detection
  98. LIGO/Virgo/KAGRA S240515m: Upper limits from Swift/BAT-GUANO
  99. LIGO/Virgo/KAGRA S240514x: Upper limits from Swift/BAT-GUANO
  100. LIGO/Virgo/KAGRA S240513ei: Upper limits from Swift/BAT-GUANO

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