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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

11109 results found.

  1. Fermi Gamma-ray Burst Monitor trigger 747839931/240912555 is not a GRB
  2. GRB 240912A : INTEGRAL SPI ACS LIGHT CURVE
  3. GRB 240912B: Fermi GBM Final Real-time Localization
  4. GRB 240912A: NOT optical spectroscopy
  5. GRB 240912A: Redshift from OSIRIS+/GTC
  6. GRB 240910A: Redshift from OSIRIS+/GTC
  7. GRB 240912A: Fermi GBM Final Real-time Localization
  8. GRB 240910A: Fermi GBM Observation
  9. GRB 240910A: NOT optical observations
  10. GRB 240910A: Swift-XRT detection of GOTO24fvl/AT2024vfp
  11. GRB 240910A: JinShan optical observations
  12. GRB 240910A: GOTO candidate optical counterpart
  13. GRB 240710A: SVOM/GRM observation
  14. GRB 240910A: Swift ToO observations
  15. IPN triangulation of GRB 240905B (short)
  16. GRB 240825A: 7DT Optical Upper Limit
  17. GRB 240910A: GRBAlpha detection
  18. GRB 240910B: Fermi GBM Final Real-time Localization
  19. GRB 240910A: SVOM/GRM observation
  20. Fermi GRB 240910A: Global MASTER-Net observations report
  21. GRB 240910A: Fermi GBM Final Real-time Localization
  22. GRB 240905B: Fermi GBM Observation
  23. Fermi trigger No 747553301: Global MASTER-Net observations report
  24. GRB 240905B: GOTO optical upper limits
  25. Fermi GRB 240908A: Global MASTER-Net observations report
  26. GRB 240908A: Fermi GBM Final Real-time Localization
  27. GRB 240801A: SVOM/GRM observation
  28. GRB 240905B: Swift-XRT observations
  29. GRB 240905B: Fermi-LAT detection
  30. GRB 240905B: Swift ToO observations
  31. Fermi GRB 240905D: Global MASTER-Net observations report
  32. Fermi GRB 240905A: Global MASTER-Net observations report
  33. GRB 240825A: Montarrenti Observatory optical follow-up observations
  34. GRB 240905D: AstroSat CZTI detection
  35. GRB 240905A: SVOM/GRM observation
  36. Fermi GRB 240905B: Global MASTER-Net observations report
  37. GRB 240905D: Fermi GBM Final Real-time Localization
  38. GRB 240905B: AstroSat CZTI detection and localization
  39. GRB 240905C: Fermi GBM Final Real-time Localization
  40. GRB 240905B: Fermi GBM Final Real-time Localization
  41. GRB 240825A: ATCA Detection of Radio Counterpart
  42. GRB 240905A: Fermi GBM Final Real-time Localization
  43. Fermi Gamma-ray Burst Monitor trigger 747163821/240904729 is not a GRB
  44. Fermi trigger No 747163821: Global MASTER-Net observations report
  45. GRB 240828A: SVOM/GRM observation
  46. Fermi Gamma-ray Burst Monitor trigger 240831A is not a GRB
  47. GRB 240828A: GECAM detection
  48. GRB 240831B: Fermi GBM Final Localization
  49. Fermi Gamma-ray Burst Monitor trigger 746882332/240901471 is not a GRB
  50. Fermi trigger No 746923430: Global MASTER-Net observations report
  51. GRB 240828A: SAO RAS AS-500(2) optical observations
  52. Fermi trigger No 746882332: Global MASTER-Net observations report
  53. GRB 240825A: TSHAO Optical Upper Limit
  54. GRB 240829B: GRBAlpha detection
  55. Fermi trigger No 746816563: Global MASTER-Net observations report
  56. GRB 240831A: Fermi GBM Final Real-time Localization
  57. GRB 240825A: SOAR observations
  58. Fermi trigger No 746684112: Global MASTER-Net observations report
  59. GRB 240828A: SAO RAS optical observations
  60. Fermi trigger No 746587425: Global MASTER-Net observations report
  61. GRB 240829B: Fermi GBM Final Localization
  62. GRB 240828A: Fermi GBM Observation
  63. GRB 240629A: First GRB Detected by BurstCube
  64. GRB 240828A: KAIT Optical Afterglow Candidate
  65. GRB 240825A: SVOM/VT optical detection
  66. GRB 240828A: Swift-XRT afterglow detection
  67. GRB 240825A: further SAO RAS optical observations
  68. GRB 240828A: Fermi-LAT detection
  69. GRB 240828A: Tiled Swift observations
  70. GRB 240828A: AstroSat CZTI detection of a long burst
  71. Fermi GRB 240828A: Bassano Bresciano Observatory upper limit
  72. GRB 240825A: Upper limits from a neutrino search with IceCube
  73. Fermi GRB 240828A: Global MASTER-Net observations report
  74. Fermi trigger No 746438824: Global MASTER-Net observations report
  75. GRB 240828A: Fermi GBM Final Real-time Localization
  76. GRB 240821A: the second and third EP-FXT follow-up observations and afterglow candidates
  77. GRB 240825A: GECAM detection
  78. GRB 240825A: SAO RAS optical observations
  79. GRB 240825A: TNG optical photometry and spectroscopy
  80. GRB 240824B: Ondrejov D50 optical limit
  81. GRB 240825A: KAIT optical observations
  82. GRB 240825A: PRIME near-infrared detection
  83. Konus-Wind detection of GRB 240825A (bright/long)
  84. GRB 240825A: Fermi GBM Observation
  85. GRB 240825A : MISTRAL/T193 OHP optical follow-up of the afterglow
  86. GRB 240825A: AKO Optical Follow-Up Observations
  87. GRB 240825A: AstroSat CZTI detection of the long bright burst
  88. SGR 1E 1841-045 / Kes 73: SVOM/GRM observation
  89. GRB 240825A: REM detection of the optical/NIR afterglow
  90. GRB 240825A: VLT/X-shooter redshift
  91. GRB 240825A: SVOM/C-GFT optical observations
  92. GRB 240825A: Montarrenti Observatory optical observations
  93. GRB 240825A: Fermi-LAT detection
  94. GRB 240824B: KAIT optical upper limit
  95. GRB 240824B: Fermi GBM Observation
  96. Fermi GRB 240825A: Global MASTER-Net observations report
  97. GRB 240824B: NOT optical upper limit
  98. GRB 240825A: 1.6m Mephisto multi-band detection
  99. GRB 240825A: AKO Optical Afterglow Detection
  100. GRB 240825A: Nanshan/HMT optical afterglow observations

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