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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"

37346 results found.

  1. GRB 240619A: detection of a radio counterpart with AMI-LA
  2. GRB 240624A: Swift detection of a burst
  3. EP240618a: NOT further optical observations
  4. GRB 240619A: J-band detection with WINTER (duplicate submission of GCN 36739)
  5. GRB 240619A: J-band detection with WINTER
  6. EP240618a: NOT optical counterpart candidate
  7. GRB 240529A: JinShan optical observations
  8. IPN triangulation of GRB 240615A (short)
  9. GRB 240619A: GRBAlpha detection
  10. GRB 240619A: Swift-XRT probable afterglow detection
  11. GRB 240619A: Swift ToO observations
  12. GRB 240619A: CALET Gamma-Ray Burst Monitor detection
  13. GRB 240619C: NuSTAR automated detection of the GRB
  14. GRB 240619A: Fermi GBM Observation
  15. Fermi GBM Sub-Threshold Detection of GRB 240619C
  16. GRB 240619A: GOTO candidate optical afterglow
  17. EP240618a: Abastumani optical observationsEP240618a
  18. GRB 240615A: NOT optical observations
  19. GRB 240619C: AstroSat CZTI detection
  20. Fermi GRB 240619A: Global MASTER-Net observations report
  21. GRB 240615A: possible transient detection from Wendelstein observations
  22. Fermi Gamma-ray Burst Monitor trigger 740474239/240619304 is not a GRB
  23. GRB 240619B: Fermi GBM Final Real-time Localization
  24. GRB240615A: 1.3m DFOT optical upper limit
  25. GRB 240619A: BALROG localization (Fermi Trigger 740461416 / GRB 240619155)
  26. GRB 240619A: Fermi GBM Final Real-time Localization
  27. EP240617a: BOOTES-6/DPRT optical upper limit
  28. EP240617a is likely a GRB event
  29. LIGO/Virgo/KAGRA S240615ea: Upper limits from Swift/BAT-GUANO
  30. LIGO/Virgo/KAGRA S240615dg: Upper limits from Swift/BAT-GUANO
  31. GRB 240615A: J-band upper limits from WINTER
  32. GRB 240615A: Fermi GBM Observation
  33. GRB 240615A: Swift-XRT observations
  34. GRB 240615A: GECAM detection
  35. GRB 240615A: FLWO-1.2m optical upper limits
  36. Fermi GRB 240616A: Global MASTER-Net observations report
  37. Konus-Wind detection of GRB 240615A (short/hard)
  38. GRB 240615A: GOTO optical upper limits
  39. GRB 240616A: Fermi GBM Final Real-time Localization
  40. GRB 240615A: Swift ToO observations
  41. GRB 240615A: Swift/BAT-GUANO arcminute localization of a short burst
  42. GRB 240615A: Fermi GBM Final Real-time Localization
  43. GRB 240603A: VZLUSAT-2 detection
  44. GRB 240612A: GRBAlpha detection
  45. GRB 240613A: Fermi GBM Final Real-time Localization
  46. Fermi GRB 240612B: Global MASTER-Net observations report
  47. Fermi GRB 240612A: Global MASTER-Net observations report
  48. GRB 240612B: Fermi GBM Final Real-time Localization
  49. GRB 240612A: Fermi GBM Final Real-time Localization
  50. GRB 240607A: GECAM detection of a bright long burst
  51. Fermi GRB 240611A: Global MASTER-Net observations report
  52. Konus-Wind detection of GRB 240607A
  53. GRB 240611A: Fermi GBM Final Real-time Localization
  54. GRB 240529A: LBT optical detection and late temporal decay
  55. GRB 240529A : MITSuME Akeno optical afterglow detection
  56. Fermi GRB 240610A: Global MASTER-Net observations report
  57. GRB 240610A: Fermi GBM Final Real-time Localization
  58. IPN triangulation of GRB 240607A
  59. Fermi Gamma-ray Burst Monitor trigger 739632045/240609556 is not a GRB
  60. Fermi GRB 240608A: Global MASTER-Net observations report
  61. Konus-Wind detection of GRB 240606B
  62. GRB 240608A: Fermi GBM Final Real-time Localization
  63. Fermi GRB 240607A: Global MASTER-Net observations report
  64. GRB 240529A: NOEMA detection
  65. GRB 240607A: Fermi GBM Observation
  66. GRB 240606B: Fermi GBM Observation
  67. Swift Trigger 1235109: consistent with noise and not astrophysical
  68. GRB 240607A: AstroSat CZTI detection of bright long burst
  69. GRB 240607A: Fermi GBM detection of a very bright burst
  70. GRB 240529A: radio detection with AMI-LA
  71. GRB 240607A: BALROG localization (Fermi Trigger 739450879 / GRB 240607459)
  72. GRB 240607A: Fermi GBM Final Real-time Localization
  73. GRB 240606B: GECAM-B detection a long burst
  74. GRB 240606B: Swift-XRT afterglow detection
  75. GRB 240606B: Swift ToO observations
  76. GRB 240606B: Swift/BAT-GUANO arcminute localization of a burst
  77. Konus-Wind detection of GRB 240603A
  78. Swift Trigger 1235109: a possible GRB 240606A
  79. Fermi GRB 240604A: Global MASTER-Net observations report
  80. IPN triangulation of GRB 240531A (short)
  81. Fermi GRB 240605A: Global MASTER-Net observations report
  82. Fermi GRB 240605C: Global MASTER-Net observations report
  83. Fermi Gamma-ray Burst Monitor trigger 739290883/240605607 is not a GRB
  84. GRB 240605C: Fermi GBM Final Real-time Localization
  85. IPN triangulation of GRB 240603A
  86. GRB 240605B: Fermi GBM Final Real-time Localization
  87. GRB 240604A: Fermi GBM Final Localization
  88. GRB 240605A: Fermi GBM Final Real-time Localization
  89. GRB 240604A: GECAM detection of a long burst
  90. GRB 240529A: SAO RAS optical observations
  91. Swift Trigger 1232755: likely consistent with noise and not astrophysical
  92. Fermi GRB 240603C: Global MASTER-Net observations report
  93. LIGO/Virgo/KAGRA S240601co: Upper limits from Swift/BAT-GUANO
  94. LIGO/Virgo/KAGRA S240530a: Upper limits from Swift/BAT-GUANO
  95. GRB 240603A: Fermi GBM Final Localization
  96. GRB 240603C: BALROG localization (Fermi Trigger 739102156 / GRB 240603423)
  97. GRB 240603C: Fermi GBM Final Real-time Localization
  98. GRB 240603B: Swift detection of a possible burst
  99. GRB 240529A: MASTER prompt OT detection
  100. GRB 240603A: GECAM detection of a short burst

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