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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"

27278 results found.

  1. IPN triangulation of GRB 240607A
  2. Fermi Gamma-ray Burst Monitor trigger 739632045/240609556 is not a GRB
  3. Fermi trigger No 739632045: Global MASTER-Net observations report
  4. Fermi GRB 240608A: Global MASTER-Net observations report
  5. Konus-Wind detection of GRB 240606B
  6. Fermi trigger No 739506569: Global MASTER-Net observations report
  7. GRB 240608A: Fermi GBM Final Real-time Localization
  8. Fermi GRB 240607A: Global MASTER-Net observations report
  9. GRB 240607A: Fermi GBM Observation
  10. GRB 240606B: Fermi GBM Observation
  11. Swift Trigger 1235109: consistent with noise and not astrophysical
  12. GRB 240607A: Fermi GBM detection of a very bright burst
  13. GRB 240607A: BALROG localization (Fermi Trigger 739450879 / GRB 240607459)
  14. GRB 240607A: Fermi GBM Final Real-time Localization
  15. GRB 240606B: GECAM-B detection a long burst
  16. Fermi trigger No 739373591: Global MASTER-Net observations report
  17. Swift GRB240606.15: Global MASTER-Net observations report
  18. GRB 240606B: Swift/BAT-GUANO arcminute localization of a burst
  19. Konus-Wind detection of GRB 240603A
  20. Swift Trigger 1235109: a possible GRB 240606A
  21. Fermi GRB 240604A: Global MASTER-Net observations report
  22. Fermi GRB 240605A: Global MASTER-Net observations report
  23. Fermi GRB 240605C: Global MASTER-Net observations report
  24. Fermi Gamma-ray Burst Monitor trigger 739290883/240605607 is not a GRB
  25. GRB 240605C: Fermi GBM Final Real-time Localization
  26. IPN triangulation of GRB 240603A
  27. GRB 240605B: Fermi GBM Final Real-time Localization
  28. GRB 240604A: Fermi GBM Final Localization
  29. GRB 240605A: Fermi GBM Final Real-time Localization
  30. GRB 240604A: GECAM detection of a long burst
  31. Swift Trigger 1232755: likely consistent with noise and not astrophysical
  32. Fermi GRB 240603C: Global MASTER-Net observations report
  33. LIGO/Virgo/KAGRA S240601co: Upper limits from Swift/BAT-GUANO
  34. LIGO/Virgo/KAGRA S240530a: Upper limits from Swift/BAT-GUANO
  35. GRB 240603A: Fermi GBM Final Localization
  36. GRB 240603C: BALROG localization (Fermi Trigger 739102156 / GRB 240603423)
  37. GRB 240603C: Fermi GBM Final Real-time Localization
  38. Swift Trigger 1232465: consistent with noise
  39. GRB 240603B: Swift detection of a possible burst
  40. GRB 240603A: GECAM detection of a short burst
  41. Fermi GRB 240602A: Global MASTER-Net observations report
  42. The EP-WXT source triggered on June 1st is likely a flaring star
  43. GRB 240602A: Fermi GBM Final Real-time Localization
  44. Swift Trigger 1232465 is not a GRB
  45. LXT 240528A: GSP optical upper limit
  46. GRB 240529A: 1.3m DFOT Optical observations
  47. GRB 240529A: Insight-HXMT/HE detection
  48. GRB 240529A: GROWTH-India optical follow-up
  49. GRB 240529A: AKO Optical Afterglow Detection
  50. LIGO/Virgo/KAGRA S240527fv: Upper limits from Swift/BAT-GUANO
  51. LIGO/Virgo/KAGRA S240525p: Upper limits from Swift/BAT-GUANO
  52. GRB 240529A: Skynet Optical Observations
  53. GRB 240529A: Swift-BAT refined analysis
  54. LIGO/Virgo S240527fv: GRANDMA/FRAM-Auger Optical Observations
  55. GRB 240529A: Swift-XRT refined Analysis
  56. GRB240529A: BOOTES-6/DPRT optical detection
  57. GRB 240529A: Swift/UVOT Detection
  58. GRB 240529A: NOT optical observations
  59. GRB 240529A: GOTO optical afterglow detection
  60. GRB 240529A: Swift detection of a burst with an optical counterpart
  61. Swift GRB240529.12: Global MASTER-Net observations report
  62. GRB 240527B: Fermi GBM Observation
  63. Fermi GRB 240527A: Global MASTER-Net observations report
  64. GRB 240527B: Fermi-LAT detection
  65. LAT GRB240527.59: Global MASTER-Net observations report
  66. Fermi GRB 240527B: Global MASTER-Net observations report
  67. GRB 240527B: Fermi GBM Final Localization
  68. GRB 240527B: BALROG localization (Fermi Trigger 738511436 / GRB 240527586)
  69. GRB 240527A: Fermi GBM Final Real-time Localization
  70. GRB 240523A: Swift-BAT refined analysis
  71. Fermi trigger No 738348224: Global MASTER-Net observations report
  72. Fermi trigger No 738330463: Global MASTER-Net observations report
  73. GRB 240523A: Swift-XRT refined Analysis
  74. GRB 240523A: Swift detection of a burst
  75. GRB 240521B: Fermi GBM Observation
  76. Fermi GBM Sub-Threshold Detection of GRB 240516B
  77. GRB 240521B: Swift/BAT-GUANO arcminute localization of a long burst
  78. Fermi trigger No 737996942: Global MASTER-Net observations report
  79. EP240518a: GSP optical upper limit
  80. GRB 240521A: GECAM-B detection of a long burst
  81. LIGO/Virgo/KAGRA S240515m: Upper limits from Swift/BAT-GUANO
  82. LIGO/Virgo/KAGRA S240514x: Upper limits from Swift/BAT-GUANO
  83. LIGO/Virgo/KAGRA S240513ei: Upper limits from Swift/BAT-GUANO
  84. GRB 240504A: VZLUSAT-2 detection
  85. GRB 240516A: Swift/UVOT Upper Limits
  86. Fermi trigger No 737788024: Global MASTER-Net observations report
  87. EP240518a: possibly identified with a flare star by EP-FXT
  88. GRB 240519A: BALROG localization (Fermi Trigger 737788024 / GRB 240519213)
  89. EP240518a: EP-WXT detection of a new X-ray transient
  90. GRB 240516A: Swift-BAT refined analysis
  91. Fermi GRB 240517A: Global MASTER-Net observations report
  92. IPN triangulation of GRB 240514B (short)
  93. GRB 240517A: Fermi GBM Final Real-time Localization
  94. Konus-Wind detection of GRB 240513A
  95. GRB 240516A: Swift-XRT refined Analysis
  96. Fermi trigger No 737559855: Global MASTER-Net observations report
  97. GRB 240516A: Fermi GBM Observation
  98. GRB 240516A: GOTO optical upper limit
  99. LIGO/Virgo/KAGRA S240422ed: GRID non-detection and upper limits
  100. Fermi trigger No 737523389: Global MASTER-Net observations report

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