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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"

39257 results found.

  1. GRB 240615A: Swift ToO observations
  2. GRB 240615A: Swift/BAT-GUANO arcminute localization of a short burst
  3. GRB 240615A: Fermi GBM Final Real-time Localization
  4. GRB 240603A: VZLUSAT-2 detection
  5. GRB 240612A: GRBAlpha detection
  6. GRB 240613A: Fermi GBM Final Real-time Localization
  7. Fermi GRB 240612B: Global MASTER-Net observations report
  8. Fermi GRB 240612A: Global MASTER-Net observations report
  9. GRB 240612B: Fermi GBM Final Real-time Localization
  10. GRB 240612A: Fermi GBM Final Real-time Localization
  11. GRB 240607A: GECAM detection of a bright long burst
  12. Fermi GRB 240611A: Global MASTER-Net observations report
  13. Konus-Wind detection of GRB 240607A
  14. GRB 240611A: Fermi GBM Final Real-time Localization
  15. GRB 240529A: LBT optical detection and late temporal decay
  16. GRB 240529A : MITSuME Akeno optical afterglow detection
  17. Trigger 1236151: Swift detection of EXO 0748-676
  18. Fermi GRB 240610A: Global MASTER-Net observations report
  19. GRB 240610A: Fermi GBM Final Real-time Localization
  20. IPN triangulation of GRB 240607A
  21. Fermi Gamma-ray Burst Monitor trigger 739632045/240609556 is not a GRB
  22. Fermi trigger No 739632045: Global MASTER-Net observations report
  23. Fermi GRB 240608A: Global MASTER-Net observations report
  24. Konus-Wind detection of GRB 240606B
  25. Fermi trigger No 739506569: Global MASTER-Net observations report
  26. GRB 240608A: Fermi GBM Final Real-time Localization
  27. Fermi GRB 240607A: Global MASTER-Net observations report
  28. GRB 240529A: NOEMA detection
  29. GRB 240607A: Fermi GBM Observation
  30. GRB 240606B: Fermi GBM Observation
  31. Swift Trigger 1235109: consistent with noise and not astrophysical
  32. GRB 240607A: AstroSat CZTI detection of bright long burst
  33. GRB 240607A: Fermi GBM detection of a very bright burst
  34. GRB 240529A: radio detection with AMI-LA
  35. GRB 240607A: BALROG localization (Fermi Trigger 739450879 / GRB 240607459)
  36. GRB 240607A: Fermi GBM Final Real-time Localization
  37. GRB 240606B: GECAM-B detection a long burst
  38. Fermi trigger No 739373591: Global MASTER-Net observations report
  39. GRB 240606B: Swift-XRT afterglow detection
  40. Swift GRB240606.15: Global MASTER-Net observations report
  41. GRB 240606B: Swift ToO observations
  42. GRB 240606B: Swift/BAT-GUANO arcminute localization of a burst
  43. Konus-Wind detection of GRB 240603A
  44. Swift Trigger 1235109: a possible GRB 240606A
  45. Fermi GRB 240604A: Global MASTER-Net observations report
  46. IPN triangulation of GRB 240531A (short)
  47. Fermi GRB 240605A: Global MASTER-Net observations report
  48. Fermi GRB 240605C: Global MASTER-Net observations report
  49. Fermi Gamma-ray Burst Monitor trigger 739290883/240605607 is not a GRB
  50. GRB 240605C: Fermi GBM Final Real-time Localization
  51. IPN triangulation of GRB 240603A
  52. GRB 240605B: Fermi GBM Final Real-time Localization
  53. GRB 240604A: Fermi GBM Final Localization
  54. GRB 240605A: Fermi GBM Final Real-time Localization
  55. GRB 240604A: GECAM detection of a long burst
  56. GRB 240529A: SAO RAS optical observations
  57. Swift Trigger 1232755: likely consistent with noise and not astrophysical
  58. Fermi GRB 240603C: Global MASTER-Net observations report
  59. LIGO/Virgo/KAGRA S240601co: Upper limits from Swift/BAT-GUANO
  60. LIGO/Virgo/KAGRA S240530a: Upper limits from Swift/BAT-GUANO
  61. GRB 240603A: Fermi GBM Final Localization
  62. GRB 240603C: BALROG localization (Fermi Trigger 739102156 / GRB 240603423)
  63. GRB 240603C: Fermi GBM Final Real-time Localization
  64. GRB 240603B: Swift detection of a possible burst
  65. GRB 240529A: MASTER prompt OT detection
  66. GRB 240603A: GECAM detection of a short burst
  67. GRB 240529A: continued SAO RAS optical observations
  68. Fermi GRB 240602A: Global MASTER-Net observations report
  69. GRB 240529A: OSN optical detection
  70. GRB 240529A: further SAO RAS optical observations
  71. GRB 240602A: Fermi GBM Final Real-time Localization
  72. Swift Trigger 1232465 is not a GRB
  73. GRB 240529A: AKO Optical Afterglow Follow-Up Observations
  74. LXT 240528A: GSP optical upper limit
  75. GRB 240529A: 1.3m DFOT Optical observations
  76. GRB 240531A: AstroSat CZTI detection of a short burst
  77. GRB 240529A : Mondy optical observations
  78. Konus-Wind detection of GRB 240529A
  79. IPN triangulation of the initial episode of GRB 240529A
  80. GRB 240529A: SAO RAS optical observations
  81. GRB 240529A: MAAO 0.7m telescope optical afterglow detection
  82. GRB 240529A: Insight-HXMT/HE detection
  83. GRB 240529A: optical photometry from Konkoly
  84. GRB 240529A: GROWTH-India optical follow-up
  85. GRB 240529A: T193/MISTRAL observations
  86. GRB 240529A: Redshift from GTC/OSIRIS+
  87. GRB 240529A: AKO Optical Afterglow Detection
  88. LIGO/Virgo/KAGRA S240527fv: Upper limits from Swift/BAT-GUANO
  89. LIGO/Virgo/KAGRA S240525p: Upper limits from Swift/BAT-GUANO
  90. GRB 240529A: J-band detections with WINTER
  91. GRB 240529A: Skynet Optical Observations
  92. GRB 240529A: Swift-BAT refined analysis
  93. GRB 240529A: Swift-XRT refined Analysis
  94. GRB240529A: BOOTES-6/DPRT optical detection
  95. GRB 240529A: Swift/UVOT Detection
  96. GRB 240529A: NOT optical observations
  97. GRB 240529A: AstroSat CZTI detection
  98. GRB 240529A: GOTO optical afterglow detection
  99. GRB 240527B: Swift-XRT afterglow detection
  100. GRB 240529A: Enhanced Swift-XRT position

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