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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"

24517 results found.

  1. Swift Trigger 1232465 is not a GRB
  2. LIGO/Virgo/KAGRA S240530a: Updated Sky localization
  3. GRB 240529A: 1.3m DFOT Optical observations
  4. LIGO/Virgo/KAGRA S240527en: Updated Sky localization
  5. LIGO/Virgo/KAGRA S240601aj: Identification of a GW compact binary merger candidate
  6. Konus-Wind detection of GRB 240529A
  7. IPN triangulation of the initial episode of GRB 240529A
  8. LIGO/Virgo/KAGRA S240531bp: Updated Sky localization
  9. LIGO/Virgo/KAGRA S240531bp: Identification of a GW compact binary merger candidate
  10. GRB 240529A: GROWTH-India optical follow-up
  11. GRB 240529A: Redshift from GTC/OSIRIS+
  12. LIGO/Virgo/KAGRA S240530a: Identification of a GW compact binary merger candidate
  13. LIGO/Virgo/KAGRA S240527fv: Upper limits from Swift/BAT-GUANO
  14. LIGO/Virgo/KAGRA S240525p: Upper limits from Swift/BAT-GUANO
  15. GRB 240529A: Skynet Optical Observations
  16. GRB 240529A: Swift-BAT refined analysis
  17. LIGO/Virgo S240527fv: GRANDMA/FRAM-Auger Optical Observations
  18. Swift GRB240529.12: Global MASTER-Net observations report
  19. LIGO/Virgo/KAGRA S240527fv: Updated Sky localization
  20. GRB 240527B: Fermi GBM Observation
  21. Fermi GRB 240527A: Global MASTER-Net observations report
  22. LIGO/Virgo/KAGRA S240527fv: Identification of a GW compact binary merger candidate
  23. GRB 240527B: Fermi-LAT detection
  24. LAT GRB240527.59: Global MASTER-Net observations report
  25. LIGO/Virgo/KAGRA S240527en: Identification of a GW compact binary merger candidate
  26. Fermi GRB 240527B: Global MASTER-Net observations report
  27. GRB 240527B: Fermi GBM Final Localization
  28. GRB 240527B: BALROG localization (Fermi Trigger 738511436 / GRB 240527586)
  29. GRB 240527A: Fermi GBM Final Real-time Localization
  30. GRB 240523A: Swift-BAT refined analysis
  31. Fermi trigger No 738348224: Global MASTER-Net observations report
  32. Fermi trigger No 738330463: Global MASTER-Net observations report
  33. LIGO/Virgo/KAGRA S240525p: Updated Sky localization
  34. LIGO/Virgo/KAGRA S240525p: Identification of a GW compact binary merger candidate
  35. GRB 240521B: Fermi GBM Observation
  36. Fermi GBM Sub-Threshold Detection of GRB 240516B
  37. GRB 240521B: Swift/BAT-GUANO arcminute localization of a long burst
  38. Fermi trigger No 737996942: Global MASTER-Net observations report
  39. LIGO/Virgo/KAGRA S240520cv: Updated Sky localization and EM Bright Classification
  40. GRB 240521A: GECAM-B detection of a long burst
  41. GRB 240516B: AstroSat CZTI detection
  42. LIGO/Virgo/KAGRA S240515m: Upper limits from Swift/BAT-GUANO
  43. LIGO/Virgo/KAGRA S240514x: Upper limits from Swift/BAT-GUANO
  44. LIGO/Virgo/KAGRA S240513ei: Upper limits from Swift/BAT-GUANO
  45. LIGO/Virgo/KAGRA S240520cv: Identification of a GW compact binary merger candidate
  46. IceCube-Cascade 240518A: Upper limits from a search for additional neutrino events in IceCube
  47. GRB 240514B: VZLUSAT-2 detection
  48. GRB 240504A: VZLUSAT-2 detection
  49. GRB 240502A: VZLUSAT-2 detection
  50. GRB 240519A: GRBAlpha detection
  51. Fermi trigger No 737788024: Global MASTER-Net observations report
  52. EP240518a: possibly identified with a flare star by EP-FXT
  53. GRB 240519A: BALROG localization (Fermi Trigger 737788024 / GRB 240519213)
  54. LIGO/Virgo/KAGRA S240514c: Updated Sky localization
  55. GRB 240516A: Swift-BAT refined analysis
  56. Fermi GRB 240517A: Global MASTER-Net observations report
  57. IPN triangulation of GRB 240514B (short)
  58. GRB 240517A: Fermi GBM Final Real-time Localization
  59. Konus-Wind detection of GRB 240513A
  60. GRB 240516A: Swift-XRT refined Analysis
  61. Fermi trigger No 737559855: Global MASTER-Net observations report
  62. GRB 240516A: Fermi GBM Observation
  63. GRB 240511A: Observations from GTC/OSIRIS+
  64. LIGO/Virgo/KAGRA S240422ed: GRID non-detection and upper limits
  65. Fermi trigger No 737523389: Global MASTER-Net observations report
  66. GRB 240516A: Swift detection of a burst
  67. Swift GRB240516.15: Global MASTER-Net observations report
  68. Fermi trigger No 737476171: Global MASTER-Net observations report
  69. GRB 240514B: GOTO candidate optical counterpart
  70. MAXI GRB240514.78: Global MASTER-Net observations report
  71. GRB 240514B: GRBAlpha detection
  72. LIGO/Virgo/KAGRA S240514x: Updated Sky localization
  73. LIGO/Virgo/KAGRA S240515m: Identification of a GW compact binary merger candidate
  74. GRB 240514B: Fermi GBM Detection
  75. LIGO/Virgo/KAGRA S240422ed: Las Cumbres Observatory Follow-up Observations of the Localization Region
  76. GRB 240513A: Fermi GBM observation
  77. GRB 240513A: Swift-XRT observations
  78. LIGO/Virgo/KAGRA S240513ei: Updated Sky localization
  79. LIGO/Virgo/KAGRA S240514x: Identification of a GW compact binary merger candidate
  80. GRB 240514C: Fermi GBM Final Real-time Localization
  81. LIGO/Virgo/KAGRA S240514c: Identification of a GW compact binary merger candidate
  82. Fermi GRB 240514B: Global MASTER-Net observations report
  83. transient: Xinglong Nearby Galaxy Supernova Survey detection of AT2024iss
  84. GRB 240514B: Fermi GBM Final Real-time Localization
  85. LIGO/Virgo/KAGRA S240507p: Upper limits from Swift/BAT-GUANO
  86. LIGO/Virgo/KAGRA S240505av: Upper limits from Swift/BAT-GUANO
  87. LIGO/Virgo/KAGRA S240505av: Upper limits from Swift/BAT-GUANO
  88. GRB 240514A: Fermi GBM Final Real-time Localization
  89. LAT GRB240513.31: Global MASTER-Net observations report
  90. GRB 240513A: Fermi-LAT detection
  91. LIGO/Virgo/KAGRA S240513ei: Identification of a GW compact binary merger candidate
  92. GRB 240511A: Fermi GBM Observation
  93. GRB 240511A: Swift-BAT refined analysis
  94. Fermi GRB 240513B: Global MASTER-Net observations report
  95. Fermi trigger No 737277727: Global MASTER-Net observations report
  96. GRB 240513B: Fermi GBM Final Real-time Localization
  97. LIGO/Virgo/KAGRA S240513cx: Coverage and upper limits from MAXI/GSC observations
  98. Fermi trigger No 737258655: Global MASTER-Net observations report
  99. Fermi trigger No 737247400: Global MASTER-Net observations report
  100. Fermi trigger No 737244199: Global MASTER-Net observations report

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