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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"

27282 results found.

  1. GRB 240529A : MITSuME Akeno optical afterglow detection
  2. Trigger 1236151: Swift detection of EXO 0748-676
  3. Fermi GRB 240610A: Global MASTER-Net observations report
  4. GRB 240610A: Fermi GBM Final Real-time Localization
  5. IPN triangulation of GRB 240607A
  6. Fermi Gamma-ray Burst Monitor trigger 739632045/240609556 is not a GRB
  7. Fermi trigger No 739632045: Global MASTER-Net observations report
  8. Fermi GRB 240608A: Global MASTER-Net observations report
  9. Konus-Wind detection of GRB 240606B
  10. Fermi trigger No 739506569: Global MASTER-Net observations report
  11. GRB 240608A: Fermi GBM Final Real-time Localization
  12. Fermi GRB 240607A: Global MASTER-Net observations report
  13. GRB 240607A: Fermi GBM Observation
  14. GRB 240606B: Fermi GBM Observation
  15. Swift Trigger 1235109: consistent with noise and not astrophysical
  16. GRB 240607A: Fermi GBM detection of a very bright burst
  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. Fermi trigger No 739373591: Global MASTER-Net observations report
  21. Swift GRB240606.15: Global MASTER-Net observations report
  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. Fermi GRB 240605A: Global MASTER-Net observations report
  27. Fermi GRB 240605C: Global MASTER-Net observations report
  28. Fermi Gamma-ray Burst Monitor trigger 739290883/240605607 is not a GRB
  29. GRB 240605C: Fermi GBM Final Real-time Localization
  30. IPN triangulation of GRB 240603A
  31. GRB 240605B: Fermi GBM Final Real-time Localization
  32. GRB 240604A: Fermi GBM Final Localization
  33. GRB 240605A: Fermi GBM Final Real-time Localization
  34. GRB 240604A: GECAM detection of a long burst
  35. Swift Trigger 1232755: likely consistent with noise and not astrophysical
  36. Fermi GRB 240603C: Global MASTER-Net observations report
  37. LIGO/Virgo/KAGRA S240601co: Upper limits from Swift/BAT-GUANO
  38. LIGO/Virgo/KAGRA S240530a: Upper limits from Swift/BAT-GUANO
  39. GRB 240603A: Fermi GBM Final Localization
  40. GRB 240603C: BALROG localization (Fermi Trigger 739102156 / GRB 240603423)
  41. GRB 240603C: Fermi GBM Final Real-time Localization
  42. Swift Trigger 1232465: consistent with noise
  43. GRB 240603B: Swift detection of a possible burst
  44. GRB 240603A: GECAM detection of a short burst
  45. Fermi GRB 240602A: Global MASTER-Net observations report
  46. The EP-WXT source triggered on June 1st is likely a flaring star
  47. GRB 240602A: Fermi GBM Final Real-time Localization
  48. Swift Trigger 1232465 is not a GRB
  49. LXT 240528A: GSP optical upper limit
  50. GRB 240529A: 1.3m DFOT Optical observations
  51. GRB 240529A: Insight-HXMT/HE detection
  52. GRB 240529A: GROWTH-India optical follow-up
  53. GRB 240529A: AKO Optical Afterglow Detection
  54. LIGO/Virgo/KAGRA S240527fv: Upper limits from Swift/BAT-GUANO
  55. LIGO/Virgo/KAGRA S240525p: Upper limits from Swift/BAT-GUANO
  56. GRB 240529A: Skynet Optical Observations
  57. GRB 240529A: Swift-BAT refined analysis
  58. LIGO/Virgo S240527fv: GRANDMA/FRAM-Auger Optical Observations
  59. GRB 240529A: Swift-XRT refined Analysis
  60. GRB240529A: BOOTES-6/DPRT optical detection
  61. GRB 240529A: Swift/UVOT Detection
  62. GRB 240529A: NOT optical observations
  63. GRB 240529A: GOTO optical afterglow detection
  64. GRB 240529A: Swift detection of a burst with an optical counterpart
  65. Swift GRB240529.12: Global MASTER-Net observations report
  66. GRB 240527B: Fermi GBM Observation
  67. Fermi GRB 240527A: Global MASTER-Net observations report
  68. GRB 240527B: Fermi-LAT detection
  69. LAT GRB240527.59: Global MASTER-Net observations report
  70. Fermi GRB 240527B: Global MASTER-Net observations report
  71. GRB 240527B: Fermi GBM Final Localization
  72. GRB 240527B: BALROG localization (Fermi Trigger 738511436 / GRB 240527586)
  73. GRB 240527A: Fermi GBM Final Real-time Localization
  74. GRB 240523A: Swift-BAT refined analysis
  75. Fermi trigger No 738348224: Global MASTER-Net observations report
  76. Fermi trigger No 738330463: Global MASTER-Net observations report
  77. GRB 240523A: Swift-XRT refined Analysis
  78. GRB 240523A: Swift detection of a burst
  79. GRB 240521B: Fermi GBM Observation
  80. Fermi GBM Sub-Threshold Detection of GRB 240516B
  81. GRB 240521B: Swift/BAT-GUANO arcminute localization of a long burst
  82. Fermi trigger No 737996942: Global MASTER-Net observations report
  83. EP240518a: GSP optical upper limit
  84. GRB 240521A: GECAM-B detection of a long burst
  85. LIGO/Virgo/KAGRA S240515m: Upper limits from Swift/BAT-GUANO
  86. LIGO/Virgo/KAGRA S240514x: Upper limits from Swift/BAT-GUANO
  87. LIGO/Virgo/KAGRA S240513ei: Upper limits from Swift/BAT-GUANO
  88. GRB 240504A: VZLUSAT-2 detection
  89. GRB 240516A: Swift/UVOT Upper Limits
  90. Fermi trigger No 737788024: Global MASTER-Net observations report
  91. EP240518a: possibly identified with a flare star by EP-FXT
  92. GRB 240519A: BALROG localization (Fermi Trigger 737788024 / GRB 240519213)
  93. EP240518a: EP-WXT detection of a new X-ray transient
  94. GRB 240516A: Swift-BAT refined analysis
  95. Fermi GRB 240517A: Global MASTER-Net observations report
  96. IPN triangulation of GRB 240514B (short)
  97. GRB 240517A: Fermi GBM Final Real-time Localization
  98. Konus-Wind detection of GRB 240513A
  99. GRB 240516A: Swift-XRT refined Analysis
  100. Fermi trigger No 737559855: Global MASTER-Net observations report

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