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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"

36386 results found.

  1. Konus-Wind detection of GRB 240603A
  2. Swift Trigger 1235109: a possible GRB 240606A
  3. Fermi GRB 240604A: Global MASTER-Net observations report
  4. IPN triangulation of GRB 240531A (short)
  5. Fermi GRB 240605A: Global MASTER-Net observations report
  6. Fermi GRB 240605C: Global MASTER-Net observations report
  7. Fermi Gamma-ray Burst Monitor trigger 739290883/240605607 is not a GRB
  8. GRB 240605C: Fermi GBM Final Real-time Localization
  9. IPN triangulation of GRB 240603A
  10. GRB 240605B: Fermi GBM Final Real-time Localization
  11. GRB 240604A: Fermi GBM Final Localization
  12. GRB 240605A: Fermi GBM Final Real-time Localization
  13. GRB 240604A: GECAM detection of a long burst
  14. GRB 240529A: SAO RAS optical observations
  15. Swift Trigger 1232755: likely consistent with noise and not astrophysical
  16. Fermi GRB 240603C: Global MASTER-Net observations report
  17. LIGO/Virgo/KAGRA S240601co: Upper limits from Swift/BAT-GUANO
  18. LIGO/Virgo/KAGRA S240530a: Upper limits from Swift/BAT-GUANO
  19. GRB 240603A: Fermi GBM Final Localization
  20. GRB 240603C: BALROG localization (Fermi Trigger 739102156 / GRB 240603423)
  21. GRB 240603C: Fermi GBM Final Real-time Localization
  22. GRB 240603B: Swift detection of a possible burst
  23. GRB 240529A: MASTER prompt OT detection
  24. GRB 240603A: GECAM detection of a short burst
  25. GRB 240529A: continued SAO RAS optical observations
  26. Fermi GRB 240602A: Global MASTER-Net observations report
  27. GRB 240529A: OSN optical detection
  28. GRB 240529A: further SAO RAS optical observations
  29. GRB 240602A: Fermi GBM Final Real-time Localization
  30. Swift Trigger 1232465 is not a GRB
  31. GRB 240529A: AKO Optical Afterglow Follow-Up Observations
  32. GRB 240529A: 1.3m DFOT Optical observations
  33. GRB 240531A: AstroSat CZTI detection of a short burst
  34. GRB 240529A : Mondy optical observations
  35. Konus-Wind detection of GRB 240529A
  36. IPN triangulation of the initial episode of GRB 240529A
  37. GRB 240529A: SAO RAS optical observations
  38. GRB 240529A: MAAO 0.7m telescope optical afterglow detection
  39. GRB 240529A: Insight-HXMT/HE detection
  40. GRB 240529A: optical photometry from Konkoly
  41. GRB 240529A: GROWTH-India optical follow-up
  42. GRB 240529A: T193/MISTRAL observations
  43. GRB 240529A: Redshift from GTC/OSIRIS+
  44. GRB 240529A: AKO Optical Afterglow Detection
  45. LIGO/Virgo/KAGRA S240527fv: Upper limits from Swift/BAT-GUANO
  46. LIGO/Virgo/KAGRA S240525p: Upper limits from Swift/BAT-GUANO
  47. GRB 240529A: J-band detections with WINTER
  48. GRB 240529A: Skynet Optical Observations
  49. GRB 240529A: Swift-BAT refined analysis
  50. GRB 240529A: Swift-XRT refined Analysis
  51. GRB240529A: BOOTES-6/DPRT optical detection
  52. GRB 240529A: Swift/UVOT Detection
  53. GRB 240529A: NOT optical observations
  54. GRB 240529A: AstroSat CZTI detection
  55. GRB 240529A: GOTO optical afterglow detection
  56. GRB 240527B: Swift-XRT afterglow detection
  57. GRB 240529A: Enhanced Swift-XRT position
  58. GRB 240529A: Swift detection of a burst with an optical counterpart
  59. GRB 240527B: Fermi GBM Observation
  60. Fermi GRB 240527A: Global MASTER-Net observations report
  61. GRB 240527B: Fermi-LAT detection
  62. Fermi GRB 240527B: Global MASTER-Net observations report
  63. GRB 240527B: Fermi GBM Final Localization
  64. GRB 240527B: BALROG localization (Fermi Trigger 738511436 / GRB 240527586)
  65. GRB 240527A: Fermi GBM Final Real-time Localization
  66. GRB 240523A: Swift-BAT refined analysis
  67. GRB 240523A: Swift-XRT refined Analysis
  68. GRB 240523A: Enhanced Swift-XRT position
  69. GRB 240523A: Swift detection of a burst
  70. GRB 240521B: Fermi GBM Observation
  71. Fermi GBM Sub-Threshold Detection of GRB 240516B
  72. GRB 240513A: Swift-XRT afterglow detection
  73. GRB 240521B: Swift/BAT-GUANO arcminute localization of a long burst
  74. GRB 240521A: GECAM-B detection of a long burst
  75. GRB 240516B: AstroSat CZTI detection
  76. LIGO/Virgo/KAGRA S240515m: Upper limits from Swift/BAT-GUANO
  77. LIGO/Virgo/KAGRA S240514x: Upper limits from Swift/BAT-GUANO
  78. LIGO/Virgo/KAGRA S240513ei: Upper limits from Swift/BAT-GUANO
  79. GRB 240514B: VZLUSAT-2 detection
  80. GRB 240504A: VZLUSAT-2 detection
  81. GRB 240502A: VZLUSAT-2 detection
  82. GRB 240519A: GRBAlpha detection
  83. GRB 240516A: Swift/UVOT Upper Limits
  84. GRB 240519A: AstroSat CZTI detection
  85. GRB 240519A: BALROG localization (Fermi Trigger 737788024 / GRB 240519213)
  86. GRB 240516A: Swift-BAT refined analysis
  87. Fermi GRB 240517A: Global MASTER-Net observations report
  88. GRB 240516A ATCA radio observations
  89. IPN triangulation of GRB 240514B (short)
  90. GRB 240513A: Swift ToO observations
  91. GRB 240517A: Fermi GBM Final Real-time Localization
  92. Konus-Wind detection of GRB 240513A
  93. GRB 240516A: AstroSat CZTI detection
  94. GRB 240516A: Swift-XRT refined Analysis
  95. GRB 240514E: A possible candidate BD-21 1074
  96. GRB 240516A: Fermi GBM Observation
  97. GRB 240511A: Observations from GTC/OSIRIS+
  98. GRB 240502C: Zeiss-1000 at Koshka observations of GOTO24bao optical counterpart candidate
  99. GRB 240516A: GOTO optical upper limit
  100. LIGO/Virgo/KAGRA S240422ed: GRID non-detection and upper limits

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