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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"

11623 results found.

  1. GRB 240914B: AstroSat CZTI detection
  2. EP240913A / GRB 240913C: AstroSat CZTI detection
  3. GRB 240910A: SVOM/VT optical observations
  4. GRB 240914B: BALROG localization (Fermi Trigger 747990592 / GRB 240914298)
  5. EP240913a: A GRB Event
  6. GRB 240913B: Fermi GBM Final Real-time Localization
  7. Fermi Gamma-ray Burst Monitor trigger 747837485/240912526 is not a GRB
  8. Fermi trigger No 747920561: Global MASTER-Net observations report
  9. GRB 240912A: SVOM/GRM observation
  10. Fermi GRB 240913A: Global MASTER-Net observations report
  11. GRB 240913A: Fermi GBM Final Real-time Localization
  12. GRB 240912A: J-band observations with WINTER
  13. GRB 240912A: Fermi GBM Observation
  14. GRB 240912A: LCOGT detection and Legacy Surveys likely host galaxy
  15. Fermi Gamma-ray Burst Monitor trigger 747839931/240912555 is not a GRB
  16. GRB 240912A : INTEGRAL SPI ACS LIGHT CURVE
  17. GRB 240912B: Fermi GBM Final Real-time Localization
  18. GRB 240912A: NOT optical spectroscopy
  19. GRB 240912A: Redshift from OSIRIS+/GTC
  20. GRB 240910A: Redshift from OSIRIS+/GTC
  21. GRB 240912A: Fermi GBM Final Real-time Localization
  22. GRB 240910A: Fermi GBM Observation
  23. GRB 240910A: NOT optical observations
  24. GRB 240910A: Swift-XRT detection of GOTO24fvl/AT2024vfp
  25. GRB 240910A: JinShan optical observations
  26. GRB 240910A: GOTO candidate optical counterpart
  27. GRB 240710A: SVOM/GRM observation
  28. GRB 240910A: Swift ToO observations
  29. IPN triangulation of GRB 240905B (short)
  30. GRB 240825A: 7DT Optical Upper Limit
  31. GRB 240910A: GRBAlpha detection
  32. GRB 240910B: Fermi GBM Final Real-time Localization
  33. GRB 240910A: SVOM/GRM observation
  34. Fermi GRB 240910A: Global MASTER-Net observations report
  35. GRB 240910A: Fermi GBM Final Real-time Localization
  36. GRB 240905B: Fermi GBM Observation
  37. Fermi trigger No 747553301: Global MASTER-Net observations report
  38. GRB 240905B: GOTO optical upper limits
  39. Fermi GRB 240908A: Global MASTER-Net observations report
  40. GRB 240908A: Fermi GBM Final Real-time Localization
  41. GRB 240801A: SVOM/GRM observation
  42. GRB 240905B: Swift-XRT observations
  43. GRB 240905B: Fermi-LAT detection
  44. GRB 240905B: Swift ToO observations
  45. Fermi GRB 240905D: Global MASTER-Net observations report
  46. Fermi GRB 240905A: Global MASTER-Net observations report
  47. GRB 240825A: Montarrenti Observatory optical follow-up observations
  48. GRB 240905D: AstroSat CZTI detection
  49. GRB 240905A: SVOM/GRM observation
  50. Fermi GRB 240905B: Global MASTER-Net observations report
  51. GRB 240905D: Fermi GBM Final Real-time Localization
  52. GRB 240905B: AstroSat CZTI detection and localization
  53. GRB 240905C: Fermi GBM Final Real-time Localization
  54. GRB 240905B: Fermi GBM Final Real-time Localization
  55. GRB 240825A: ATCA Detection of Radio Counterpart
  56. GRB 240905A: Fermi GBM Final Real-time Localization
  57. Fermi Gamma-ray Burst Monitor trigger 747163821/240904729 is not a GRB
  58. Fermi trigger No 747163821: Global MASTER-Net observations report
  59. GRB 240828A: SVOM/GRM observation
  60. Fermi Gamma-ray Burst Monitor trigger 240831A is not a GRB
  61. GRB 240828A: GECAM detection
  62. GRB 240831B: Fermi GBM Final Localization
  63. Fermi Gamma-ray Burst Monitor trigger 746882332/240901471 is not a GRB
  64. Fermi trigger No 746923430: Global MASTER-Net observations report
  65. GRB 240828A: SAO RAS AS-500(2) optical observations
  66. Fermi trigger No 746882332: Global MASTER-Net observations report
  67. GRB 240825A: TSHAO Optical Upper Limit
  68. GRB 240829B: GRBAlpha detection
  69. Fermi trigger No 746816563: Global MASTER-Net observations report
  70. GRB 240831A: Fermi GBM Final Real-time Localization
  71. GRB 240825A: SOAR observations
  72. Fermi trigger No 746684112: Global MASTER-Net observations report
  73. GRB 240828A: SAO RAS optical observations
  74. Fermi trigger No 746587425: Global MASTER-Net observations report
  75. GRB 240829B: Fermi GBM Final Localization
  76. GRB 240828A: Fermi GBM Observation
  77. GRB 240629A: First GRB Detected by BurstCube
  78. GRB 240828A: KAIT Optical Afterglow Candidate
  79. GRB 240825A: SVOM/VT optical detection
  80. GRB 240828A: Swift-XRT afterglow detection
  81. GRB 240825A: further SAO RAS optical observations
  82. GRB 240828A: Fermi-LAT detection
  83. GRB 240828A: Tiled Swift observations
  84. GRB 240828A: AstroSat CZTI detection of a long burst
  85. Fermi GRB 240828A: Bassano Bresciano Observatory upper limit
  86. GRB 240825A: Upper limits from a neutrino search with IceCube
  87. Fermi GRB 240828A: Global MASTER-Net observations report
  88. Fermi trigger No 746438824: Global MASTER-Net observations report
  89. GRB 240828A: Fermi GBM Final Real-time Localization
  90. GRB 240821A: the second and third EP-FXT follow-up observations and afterglow candidates
  91. GRB 240825A: GECAM detection
  92. GRB 240825A: SAO RAS optical observations
  93. GRB 240825A: TNG optical photometry and spectroscopy
  94. GRB 240824B: Ondrejov D50 optical limit
  95. GRB 240825A: KAIT optical observations
  96. GRB 240825A: PRIME near-infrared detection
  97. Konus-Wind detection of GRB 240825A (bright/long)
  98. GRB 240825A: Fermi GBM Observation
  99. GRB 240825A : MISTRAL/T193 OHP optical follow-up of the afterglow
  100. GRB 240825A: AKO Optical Follow-Up Observations

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