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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"

27253 results found.

  1. EP240816a: EP detection of a fast X-ray transient and follow-up observation
  2. EP EP240816b: Global MASTER-Net observations report
  3. EP240816b: TRT optical upper limit
  4. EP240816b: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  5. Fermi GRB 240814A: Global MASTER-Net observations report
  6. Fermi GRB 240814C: Global MASTER-Net observations report
  7. Fermi trigger No 745306088: Global MASTER-Net observations report
  8. GRB 240814C: Fermi GBM Final Real-time Localization
  9. Fermi GRB 240814B: Global MASTER-Net observations report
  10. GRB 240812B: SVOM/GRM observation
  11. EP240802a: Kinder optical, SWIFT-UVOT, and SWIFT-XRT upper limits 6 days after the WXT detection
  12. GRB 240814B: Fermi GBM Final Real-time Localization
  13. GRB 240814A: Fermi GBM Final Real-time Localization
  14. Fermi trigger No 745220784: Global MASTER-Net observations report
  15. Konus-Wind detection of GRB 240810A
  16. Fermi Gamma-ray Burst Monitor trigger 745220784/240813240 is not a GRB
  17. GRB 240810A: SVOM/GRM observation
  18. Fermi Gamma-ray Burst Monitor trigger 240812940/745194848 is not a GRB
  19. Fermi Gamma-ray Burst Monitor trigger 240812917/745192855 is not a GRB
  20. Fermi Gamma-ray Burst Monitor trigger 240812917/745192855 is not a GRB
  21. GRB 240812D: Fermi GBM Final Real-time Localization
  22. GRB 240812C: Fermi GBM Final Real-time Localization
  23. GRB 240811A: Swift-BAT refined analysis
  24. GRB 240809A: Swift-BAT refined analysis
  25. GRB 240812B: AstroSat CZTI detection of a long burst
  26. GRB 240811A: Bassano Bresciano Observatory upper limit
  27. GRB 240811A: Swift-XRT refined Analysis
  28. Fermi Gamma-ray Burst Monitor trigger 745135620/240812255 is not a GRB
  29. GRB 240811A: Swift/UVOT Upper Limits
  30. Fermi GRB 240810A: Global MASTER-Net observations report
  31. Fermi Gamma-ray Burst Monitor trigger 240812094/745121685 is not a GRB
  32. GRB 240812A: Fermi GBM Final Real-time Localization
  33. GRB 240811A: LCOGT Optical Upper Limit
  34. Fermi trigger No 745057312: Global MASTER-Net observations report
  35. Swift GRB 240811A: Global MASTER-Net observations report
  36. GRB 240811A: Swift detection of a burst
  37. Fermi Gamma-ray Burst Monitor trigger 745050426/240811269 is not a GRB
  38. GRB240809A: Liverpool Telescope optical follow-up observations
  39. GRB 240810A: Fermi GBM Final Real-time Localization
  40. GRB 240809A: REM detection of the optical afterglow
  41. GRB 240809A: Bassano Bresciano Observatory optical observations
  42. GRB 240809A: GIT afterglow observations
  43. GRB 240809A: Swift/UVOT Detection
  44. GRB 240809A: Swift-XRT refined Analysis
  45. Swift GRB 240809A: Global MASTER-Net observations report
  46. GRB 240809A: JinShan optical observations
  47. GRB 240809A: Skynet & Photon Ranch Optical Afterglow Observations
  48. GRB 240809A: SVOM/GRM observation
  49. GRB 240808A: SVOM/GRM observation
  50. GRB 240807A: SVOM/GRM observation
  51. GRB 240809A: Swift detection of a burst with a bright optical counterpart
  52. EP-WXT trigger 01709018832: SVOM/C-GFT observations of the star flare
  53. EP240807a: STEP/T80S optical limits
  54. GRB 240807B: AstroSat CZTI detection of a short burst
  55. IceCube Alert 240808.27: Global MASTER-Net observations report
  56. EP EP240807a: Global MASTER-Net observations report
  57. EP EP240806a: Global MASTER-Net observations report
  58. GRB 240807B: Fermi GBM Final Localization
  59. GRB 240710B: VZLUSAT-2 detection
  60. Fermi trigger No 744761058: Global MASTER-Net observations report
  61. EP240807a/GRB 240807A: EP-FXT detection of the X-ray emission
  62. EP-WXT trigger 01709018832: KAIT optical observations of the star flare
  63. EP240802a/GRB240802A: KAIT optical upper limit
  64. GRB 240720B: VZLUSAT-2 detection
  65. EP240806A: Liverpool Telescope optical follow-up observations
  66. The EP-WXT trigger 01709018832 on August 7th is likely a flaring star
  67. GRB 240807A: Fermi GBM Final Localization
  68. EP240807a: EP-WXT detection of a fast X-ray transient
  69. GRB 240805B: GIT optical upper limit
  70. EP240806a: KAIT optical observations
  71. GRB 240805B: Swift-BAT refined analysis
  72. GRB 240805A: Swift-BAT refined analysis
  73. Fermi trigger No 744629911: Global MASTER-Net observations report
  74. EP240804a (GRB 240804B): NOT optical observations
  75. EP240806a: LCOGT optical counterpart detection
  76. GRB 240805B Bassano Bresciano Observatory upper limit
  77. GRB240805A: Fermi GBM Observation
  78. GRB 240805B: AbAO, CrAO, and Terskol optical upper limits
  79. Fermi Gamma-ray Burst Monitor trigger 240806402/744629911 is not a GRB
  80. EP240806a: EP-FXT detection of the X-ray emission
  81. GRB 240626B: VZLUSAT-2 detection
  82. GRB 240624B: VZLUSAT-2 detection
  83. EP 240806A: LCO optical observations
  84. EP240806a: EP-WXT detection of a fast X-ray transient
  85. EP240804a: BOOTES-6/DPRT optical detection
  86. GRB 240805B: NUTTelA-TAO / BSTI Optical Limits
  87. GRB 240805B: Swift-XRT refined Analysis
  88. Fermi trigger No 744544656: Global MASTER-Net observations report
  89. GRB 240805B: Swift/UVOT Upper Limits
  90. GRB 240805A: Swift/UVOT Upper Limits
  91. GRB 240805A: SVOM/GRM observation
  92. GRB 240805B: LCOGT Optical Upper Limits
  93. Swift GRB 240805B: Global MASTER-Net observations report
  94. GRB 240805B: JinShan optical upper limits
  95. Fermi GRB 240805A: Global MASTER-Net observations report
  96. Swift GRB 240805A: Global MASTER-Net observations report
  97. Fermi Gamma-ray Burst Monitor trigger 744558410/240805574 is not a GRB
  98. GRB 240805A: Swift-XRT refined Analysis
  99. GRB 240805B: Swift detection of a burst
  100. GRB 240805A: Fermi-LAT detection

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