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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"

27252 results found.

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

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