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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"

36393 results found.

  1. GRB 240529A: radio detection with AMI-LA
  2. GRB 240607A: BALROG localization (Fermi Trigger 739450879 / GRB 240607459)
  3. GRB 240607A: Fermi GBM Final Real-time Localization
  4. GRB 240606B: GECAM-B detection a long burst
  5. GRB 240606B: Swift-XRT afterglow detection
  6. GRB 240606B: Swift ToO observations
  7. GRB 240606B: Swift/BAT-GUANO arcminute localization of a burst
  8. Konus-Wind detection of GRB 240603A
  9. Swift Trigger 1235109: a possible GRB 240606A
  10. Fermi GRB 240604A: Global MASTER-Net observations report
  11. IPN triangulation of GRB 240531A (short)
  12. Fermi GRB 240605A: Global MASTER-Net observations report
  13. Fermi GRB 240605C: Global MASTER-Net observations report
  14. Fermi Gamma-ray Burst Monitor trigger 739290883/240605607 is not a GRB
  15. GRB 240605C: Fermi GBM Final Real-time Localization
  16. IPN triangulation of GRB 240603A
  17. GRB 240605B: Fermi GBM Final Real-time Localization
  18. GRB 240604A: Fermi GBM Final Localization
  19. GRB 240605A: Fermi GBM Final Real-time Localization
  20. GRB 240604A: GECAM detection of a long burst
  21. GRB 240529A: SAO RAS optical observations
  22. Swift Trigger 1232755: likely consistent with noise and not astrophysical
  23. Fermi GRB 240603C: Global MASTER-Net observations report
  24. LIGO/Virgo/KAGRA S240601co: Upper limits from Swift/BAT-GUANO
  25. LIGO/Virgo/KAGRA S240530a: Upper limits from Swift/BAT-GUANO
  26. GRB 240603A: Fermi GBM Final Localization
  27. GRB 240603C: BALROG localization (Fermi Trigger 739102156 / GRB 240603423)
  28. GRB 240603C: Fermi GBM Final Real-time Localization
  29. GRB 240603B: Swift detection of a possible burst
  30. GRB 240529A: MASTER prompt OT detection
  31. GRB 240603A: GECAM detection of a short burst
  32. GRB 240529A: continued SAO RAS optical observations
  33. Fermi GRB 240602A: Global MASTER-Net observations report
  34. GRB 240529A: OSN optical detection
  35. GRB 240529A: further SAO RAS optical observations
  36. GRB 240602A: Fermi GBM Final Real-time Localization
  37. Swift Trigger 1232465 is not a GRB
  38. GRB 240529A: AKO Optical Afterglow Follow-Up Observations
  39. GRB 240529A: 1.3m DFOT Optical observations
  40. GRB 240531A: AstroSat CZTI detection of a short burst
  41. GRB 240529A : Mondy optical observations
  42. Konus-Wind detection of GRB 240529A
  43. IPN triangulation of the initial episode of GRB 240529A
  44. GRB 240529A: SAO RAS optical observations
  45. GRB 240529A: MAAO 0.7m telescope optical afterglow detection
  46. GRB 240529A: Insight-HXMT/HE detection
  47. GRB 240529A: optical photometry from Konkoly
  48. GRB 240529A: GROWTH-India optical follow-up
  49. GRB 240529A: T193/MISTRAL observations
  50. GRB 240529A: Redshift from GTC/OSIRIS+
  51. GRB 240529A: AKO Optical Afterglow Detection
  52. LIGO/Virgo/KAGRA S240527fv: Upper limits from Swift/BAT-GUANO
  53. LIGO/Virgo/KAGRA S240525p: Upper limits from Swift/BAT-GUANO
  54. GRB 240529A: J-band detections with WINTER
  55. GRB 240529A: Skynet Optical Observations
  56. GRB 240529A: Swift-BAT refined analysis
  57. GRB 240529A: Swift-XRT refined Analysis
  58. GRB240529A: BOOTES-6/DPRT optical detection
  59. GRB 240529A: Swift/UVOT Detection
  60. GRB 240529A: NOT optical observations
  61. GRB 240529A: AstroSat CZTI detection
  62. GRB 240529A: GOTO optical afterglow detection
  63. GRB 240527B: Swift-XRT afterglow detection
  64. GRB 240529A: Enhanced Swift-XRT position
  65. GRB 240529A: Swift detection of a burst with an optical counterpart
  66. GRB 240527B: Fermi GBM Observation
  67. Fermi GRB 240527A: Global MASTER-Net observations report
  68. GRB 240527B: Fermi-LAT detection
  69. Fermi GRB 240527B: Global MASTER-Net observations report
  70. GRB 240527B: Fermi GBM Final Localization
  71. GRB 240527B: BALROG localization (Fermi Trigger 738511436 / GRB 240527586)
  72. GRB 240527A: Fermi GBM Final Real-time Localization
  73. GRB 240523A: Swift-BAT refined analysis
  74. GRB 240523A: Swift-XRT refined Analysis
  75. GRB 240523A: Enhanced Swift-XRT position
  76. GRB 240523A: Swift detection of a burst
  77. GRB 240521B: Fermi GBM Observation
  78. Fermi GBM Sub-Threshold Detection of GRB 240516B
  79. GRB 240513A: Swift-XRT afterglow detection
  80. GRB 240521B: Swift/BAT-GUANO arcminute localization of a long burst
  81. GRB 240521A: GECAM-B detection of a long burst
  82. GRB 240516B: AstroSat CZTI detection
  83. LIGO/Virgo/KAGRA S240515m: Upper limits from Swift/BAT-GUANO
  84. LIGO/Virgo/KAGRA S240514x: Upper limits from Swift/BAT-GUANO
  85. LIGO/Virgo/KAGRA S240513ei: Upper limits from Swift/BAT-GUANO
  86. GRB 240514B: VZLUSAT-2 detection
  87. GRB 240504A: VZLUSAT-2 detection
  88. GRB 240502A: VZLUSAT-2 detection
  89. GRB 240519A: GRBAlpha detection
  90. GRB 240516A: Swift/UVOT Upper Limits
  91. GRB 240519A: AstroSat CZTI detection
  92. GRB 240519A: BALROG localization (Fermi Trigger 737788024 / GRB 240519213)
  93. GRB 240516A: Swift-BAT refined analysis
  94. Fermi GRB 240517A: Global MASTER-Net observations report
  95. GRB 240516A ATCA radio observations
  96. IPN triangulation of GRB 240514B (short)
  97. GRB 240513A: Swift ToO observations
  98. GRB 240517A: Fermi GBM Final Real-time Localization
  99. Konus-Wind detection of GRB 240513A
  100. GRB 240516A: AstroSat CZTI detection

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