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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"

24514 results found.

  1. LIGO/Virgo/KAGRA S240527en: Updated Sky localization
  2. LIGO/Virgo/KAGRA S240601aj: Identification of a GW compact binary merger candidate
  3. Konus-Wind detection of GRB 240529A
  4. IPN triangulation of the initial episode of GRB 240529A
  5. LIGO/Virgo/KAGRA S240531bp: Updated Sky localization
  6. LIGO/Virgo/KAGRA S240531bp: Identification of a GW compact binary merger candidate
  7. GRB 240529A: GROWTH-India optical follow-up
  8. GRB 240529A: Redshift from GTC/OSIRIS+
  9. LIGO/Virgo/KAGRA S240530a: Identification of a GW compact binary merger candidate
  10. LIGO/Virgo/KAGRA S240527fv: Upper limits from Swift/BAT-GUANO
  11. LIGO/Virgo/KAGRA S240525p: Upper limits from Swift/BAT-GUANO
  12. GRB 240529A: Skynet Optical Observations
  13. GRB 240529A: Swift-BAT refined analysis
  14. LIGO/Virgo S240527fv: GRANDMA/FRAM-Auger Optical Observations
  15. Swift GRB240529.12: Global MASTER-Net observations report
  16. LIGO/Virgo/KAGRA S240527fv: Updated Sky localization
  17. GRB 240527B: Fermi GBM Observation
  18. Fermi GRB 240527A: Global MASTER-Net observations report
  19. LIGO/Virgo/KAGRA S240527fv: Identification of a GW compact binary merger candidate
  20. GRB 240527B: Fermi-LAT detection
  21. LAT GRB240527.59: Global MASTER-Net observations report
  22. LIGO/Virgo/KAGRA S240527en: Identification of a GW compact binary merger candidate
  23. Fermi GRB 240527B: Global MASTER-Net observations report
  24. GRB 240527B: Fermi GBM Final Localization
  25. GRB 240527B: BALROG localization (Fermi Trigger 738511436 / GRB 240527586)
  26. GRB 240527A: Fermi GBM Final Real-time Localization
  27. GRB 240523A: Swift-BAT refined analysis
  28. Fermi trigger No 738348224: Global MASTER-Net observations report
  29. Fermi trigger No 738330463: Global MASTER-Net observations report
  30. LIGO/Virgo/KAGRA S240525p: Updated Sky localization
  31. LIGO/Virgo/KAGRA S240525p: Identification of a GW compact binary merger candidate
  32. GRB 240521B: Fermi GBM Observation
  33. Fermi GBM Sub-Threshold Detection of GRB 240516B
  34. GRB 240521B: Swift/BAT-GUANO arcminute localization of a long burst
  35. Fermi trigger No 737996942: Global MASTER-Net observations report
  36. LIGO/Virgo/KAGRA S240520cv: Updated Sky localization and EM Bright Classification
  37. GRB 240521A: GECAM-B detection of a long burst
  38. GRB 240516B: AstroSat CZTI detection
  39. LIGO/Virgo/KAGRA S240515m: Upper limits from Swift/BAT-GUANO
  40. LIGO/Virgo/KAGRA S240514x: Upper limits from Swift/BAT-GUANO
  41. LIGO/Virgo/KAGRA S240513ei: Upper limits from Swift/BAT-GUANO
  42. LIGO/Virgo/KAGRA S240520cv: Identification of a GW compact binary merger candidate
  43. IceCube-Cascade 240518A: Upper limits from a search for additional neutrino events in IceCube
  44. GRB 240514B: VZLUSAT-2 detection
  45. GRB 240504A: VZLUSAT-2 detection
  46. GRB 240502A: VZLUSAT-2 detection
  47. GRB 240519A: GRBAlpha detection
  48. Fermi trigger No 737788024: Global MASTER-Net observations report
  49. EP240518a: possibly identified with a flare star by EP-FXT
  50. GRB 240519A: BALROG localization (Fermi Trigger 737788024 / GRB 240519213)
  51. LIGO/Virgo/KAGRA S240514c: Updated Sky localization
  52. GRB 240516A: Swift-BAT refined analysis
  53. Fermi GRB 240517A: Global MASTER-Net observations report
  54. IPN triangulation of GRB 240514B (short)
  55. GRB 240517A: Fermi GBM Final Real-time Localization
  56. Konus-Wind detection of GRB 240513A
  57. GRB 240516A: Swift-XRT refined Analysis
  58. Fermi trigger No 737559855: Global MASTER-Net observations report
  59. GRB 240516A: Fermi GBM Observation
  60. GRB 240511A: Observations from GTC/OSIRIS+
  61. LIGO/Virgo/KAGRA S240422ed: GRID non-detection and upper limits
  62. Fermi trigger No 737523389: Global MASTER-Net observations report
  63. GRB 240516A: Swift detection of a burst
  64. Swift GRB240516.15: Global MASTER-Net observations report
  65. Fermi trigger No 737476171: Global MASTER-Net observations report
  66. GRB 240514B: GOTO candidate optical counterpart
  67. MAXI GRB240514.78: Global MASTER-Net observations report
  68. GRB 240514B: GRBAlpha detection
  69. LIGO/Virgo/KAGRA S240514x: Updated Sky localization
  70. LIGO/Virgo/KAGRA S240515m: Identification of a GW compact binary merger candidate
  71. GRB 240514B: Fermi GBM Detection
  72. LIGO/Virgo/KAGRA S240422ed: Las Cumbres Observatory Follow-up Observations of the Localization Region
  73. GRB 240513A: Fermi GBM observation
  74. GRB 240513A: Swift-XRT observations
  75. LIGO/Virgo/KAGRA S240513ei: Updated Sky localization
  76. LIGO/Virgo/KAGRA S240514x: Identification of a GW compact binary merger candidate
  77. GRB 240514C: Fermi GBM Final Real-time Localization
  78. LIGO/Virgo/KAGRA S240514c: Identification of a GW compact binary merger candidate
  79. Fermi GRB 240514B: Global MASTER-Net observations report
  80. transient: Xinglong Nearby Galaxy Supernova Survey detection of AT2024iss
  81. GRB 240514B: Fermi GBM Final Real-time Localization
  82. LIGO/Virgo/KAGRA S240507p: Upper limits from Swift/BAT-GUANO
  83. LIGO/Virgo/KAGRA S240505av: Upper limits from Swift/BAT-GUANO
  84. LIGO/Virgo/KAGRA S240505av: Upper limits from Swift/BAT-GUANO
  85. GRB 240514A: Fermi GBM Final Real-time Localization
  86. LAT GRB240513.31: Global MASTER-Net observations report
  87. GRB 240513A: Fermi-LAT detection
  88. LIGO/Virgo/KAGRA S240513ei: Identification of a GW compact binary merger candidate
  89. GRB 240511A: Fermi GBM Observation
  90. GRB 240511A: Swift-BAT refined analysis
  91. Fermi GRB 240513B: Global MASTER-Net observations report
  92. Fermi trigger No 737277727: Global MASTER-Net observations report
  93. GRB 240513B: Fermi GBM Final Real-time Localization
  94. LIGO/Virgo/KAGRA S240513cx: Coverage and upper limits from MAXI/GSC observations
  95. Fermi trigger No 737258655: Global MASTER-Net observations report
  96. Fermi trigger No 737247400: Global MASTER-Net observations report
  97. Fermi trigger No 737244199: Global MASTER-Net observations report
  98. Fermi trigger No 737218721: Global MASTER-Net observations report
  99. Fermi trigger No 737196587: Global MASTER-Net observations report
  100. Fermi trigger No 737168073: Global MASTER-Net observations report

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