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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"

11551 results found.

  1. GRB 241024A: Fermi GBM Final Localisation
  2. Fermi trigger No 751449953: Global MASTER-Net observations report
  3. GRB 241018A: REM optical/NIR upper limits
  4. GRB 241016B: Fermi GBM Observations
  5. GRB 241016B: Swift/BAT-GUANO localization skymap of a short burst
  6. Fermi trigger No 750788395: Global MASTER-Net observations report
  7. GRB 241016B: SVOM/GRM observation
  8. GRB241016C: Fermi GBM Final Localization
  9. Fermi Gamma-ray Burst Monitor trigger 750792698/241016730 is not a GRB
  10. Fermi GRB 241016B: Global MASTER-Net observations report
  11. GRB 241016B: Fermi GBM Final Localization
  12. Fermi GRB 241016A: Global MASTER-Net observations report
  13. GRB 241016A: Fermi GBM Final Real-time Localization
  14. GRB 241013B: Fermi GBM Observation
  15. GRB 241013B: Swift/BAT-GUANO localization skymap of a burst
  16. GRB 241013A: Fermi GBM Observation
  17. GRB 240916A: radio detection with the VLA
  18. GRB241013A: REM observations
  19. GRB 241013B: SVOM/GRM observation
  20. Fermi GRB 241013B: Global MASTER-Net observations report
  21. GRB 241013B: Fermi GBM Final Real-time Localization
  22. GRB 241013A: a long GRB detected by INTEGRAL
  23. GRB 241013A: Fermi GBM Final Real-time Localization
  24. Fermi Gamma-ray Burst Monitor GRB trigger 750372658/241011869 (GRB 241011A) is not a GRB
  25. GRB 241011A: Fermi GBM Final Real-time Localization
  26. Fermi trigger No 750211959: Global MASTER-Net observations report
  27. Fermi Gamma-ray Burst Monitor trigger 750303285/241011066 is not a GRB
  28. Fermi Gamma-ray Burst Monitor trigger 750291012/241010924 is not a GRB
  29. Fermi trigger No 750291012: Global MASTER-Net observations report
  30. Fermi GRB 241010B: Global MASTER-Net observations report
  31. GRB 241010B: Fermi GBM Final Real-time Localization
  32. Fermi-LAT Gamma-ray Observations of IceCube-241006A
  33. GRB 241008A: Fermi GBM Observation
  34. GRB 241008A: Fermi-LAT detection
  35. GRB 241002B: Swift-XRT afterglow detection
  36. Fermi GRB 241008A: Global MASTER-Net observations report
  37. GRB 241008A: BALROG localization (Fermi Trigger 750117609 / GRB 241008917)
  38. GRB 241008A: Fermi GBM Final Real-time Localization
  39. GRB 241002B: PRIME near-infrared detection in 3rd epoch
  40. Fermi-LAT Gamma-ray Observations of NuEm-240926A
  41. GRB 240821A: Host galaxy redshift from VLT/X-shooter
  42. IceCube-241006A - IceCube observation of a high-energy neutrino candidate track-like event
  43. GRB 240930B: SVOM/C-GFT optical upper limit
  44. Fermi trigger No 749721670: Global MASTER-Net observations report
  45. GRB 240930B / EP 240930a: SVOM/GRM observation
  46. GRB 241002B: PRIME near-infrared detection in 2nd epoch
  47. GRB 241002B: Fermi GBM Observation
  48. Fermi trigger No 749735279: Global MASTER-Net observations report
  49. Fermi trigger No 749630753: Global MASTER-Net observations report
  50. Fermi trigger No 749693019: Global MASTER-Net observations report
  51. GRB 241002B: Swift-XRT observations
  52. GRB 241002B: Swift/BAT-GUANO localization skymap of a burst
  53. GRB 241002B: Swift ToO observations
  54. GRB 241002B: PRIME near-infrared detection
  55. Fermi-GBM Sub-Threshold Detection of GRB 241002D
  56. IPN triangulation of GRB 240930B / EP 240930a
  57. GRB 241002B: GOTO24gpc/AT 2024xbg follow-up observations update
  58. GRB 241002B: ULL-ASTRO-MASTER LCOGT 0.4m + QHY600 detection of the GOTO optical counterpart candidate AT 2024xbg / GOTO24gpc
  59. GRB 240930B: CALET Gamma-Ray Burst Monitor detection
  60. GRB 240929A: SAO RAS, Mondy, and CrAO optical observations
  61. EP240930a: Liverpool Telescope observations
  62. GRB 241002B: GOTO optical counterpart candidate
  63. GRB 240929A: Liverpool Telescope prompt followup observations
  64. Fermi GRB 241002B: Global MASTER-Net observations report
  65. GRB 241002B: Fermi GBM Final Real-time Localization
  66. GRB 240930B: Fermi GBM Observation
  67. GRB 240930B: GRBAlpha detection
  68. GRB 240929A: GRBAlpha detection
  69. GRB 240930B: Swift/BAT-GUANO localization skymap of a burst
  70. EP240930a: EP-FXT follow-up observation update
  71. Fermi-LAT Gamma-ray Observations of IceCube-240929A
  72. EP240930a: GOTO optical upper limits
  73. GRB 240929A: SVOM/GRM observation
  74. EP240930a: EP-WXT detection of a fast X-ray transient
  75. GRB 240929A : Leavitt Observatory optical upper limit
  76. Fermi GRB 240930B: Global MASTER-Net observations report
  77. GRB 240930B: Fermi GBM Final Real-time Localization
  78. GRB 240825A: LBT optical observations
  79. Fermi GRB 240930A: Global MASTER-Net observations report
  80. Fermi Gamma-ray Burst Monitor trigger 749362078/240930172 (GRB 240930A) is not a GRB
  81. GRB 240930A: Fermi GBM Final Real-time Localization
  82. Fermi trigger No 749339671: Global MASTER-Net observations report
  83. Fermi Gamma-ray Burst Monitor trigger 749339671/240929913 is not a GRB
  84. GRB 240929A long GRB detected by INTEGRAL
  85. GRB 240929A: BALROG localization (Fermi Trigger 749332209 / GRB 240929826)
  86. Fermi GRB 240929A: Global MASTER-Net observations report
  87. GRB 240929A: Fermi GBM Final Real-time Localization
  88. IceCube-240929A - IceCube observation of a high-energy neutrino candidate track-like event
  89. Konus-Wind detection of GRB 240912A
  90. Fermi Gamma-ray Burst Monitor trigger 749191601/240928199 is not a GRB
  91. Konus-Wind detection of GRB 240905B
  92. Insight-HXMT ToO observations of X-ray bursts from SGR 1E 1841-045 / Kes 73
  93. Konus-Wind detection of GRB 240918B
  94. IPN triangulation of GRB 240918B
  95. GRB 240905B: VZLUSAT-2 detection
  96. GRB 240918B: AstroSat CZTI detection
  97. Fermi GBM Sub-Threshold Detection of GRB240919A / EP240919a
  98. GRB 240414A: further radio observations with the VLA
  99. GRB 240919A / EP240919a: SVOM/GRM observation
  100. EP240919a: INTEGRAL SPI-ACS confirmation of reported high-energy counterpart

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