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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"

36353 results found.

  1. Fermi Gamma-ray Burst Monitor trigger 745220784/240813240 is not a GRB
  2. GRB 240809A: Correction to the VLA source position in GCN 37158
  3. GRB 240810A: SVOM/GRM observation
  4. Fermi Gamma-ray Burst Monitor trigger 240812940/745194848 is not a GRB
  5. Fermi Gamma-ray Burst Monitor trigger 240812917/745192855 is not a GRB
  6. Fermi Gamma-ray Burst Monitor trigger 240812917/745192855 is not a GRB
  7. GRB 240809A: ATA radio non-detection
  8. GRB 240812D: Fermi GBM Final Real-time Localization
  9. GRB 240812C: Fermi GBM Final Real-time Localization
  10. GRB 240809A : RAPAS follow-up observations
  11. GRB 240809A: VLA detection
  12. GRB 240809A: ALMA detection
  13. IPN triangulation of GRB 240810A (short)
  14. GRB 240811A: Swift-BAT refined analysis
  15. GRB 240809A: Swift-BAT refined analysis
  16. GRB 240812B: AstroSat CZTI detection of a long burst
  17. IceCube-240808A: Upper limits from a search for additional neutrino events in IceCube
  18. GRB 240811A: Bassano Bresciano Observatory upper limit
  19. GRB 240811A: Swift-XRT refined Analysis
  20. Fermi Gamma-ray Burst Monitor trigger 745135620/240812255 is not a GRB
  21. GRB 240811A: Swift/UVOT Upper Limits
  22. EP240801a: Assy-Turgen optical observations
  23. Fermi GRB 240810A: Global MASTER-Net observations report
  24. Fermi Gamma-ray Burst Monitor trigger 240812094/745121685 is not a GRB
  25. GRB 240812A: Fermi GBM Final Real-time Localization
  26. GRB 240811A: LCOGT Optical Upper Limit
  27. GRB 240811A: Enhanced Swift-XRT position
  28. GRB 240811A: Upper limits with Mephisto
  29. Konus-Wind detection of GRB 240809A
  30. Swift GRB 240811A: Global MASTER-Net observations report
  31. GRB 240811A: Swift detection of a burst
  32. Fermi Gamma-ray Burst Monitor trigger 745050426/240811269 is not a GRB
  33. GRB 240810A: Fermi GBM Final Real-time Localization
  34. GRB 240809A: REM detection of the optical afterglow
  35. GRB 240809A: Bassano Bresciano Observatory optical observations
  36. Konus-Wind detection of GRB 240807A (a counterpart of EP240807a)
  37. GRB 240809A: Conclusive redshift from VLT
  38. GRB 240809A: KAIT optical observations
  39. GRB 240808A: AstroSat CZTI detection
  40. GRB 240809A: GIT afterglow observations
  41. GRB 240809B: MAXI/GSC detection
  42. GRB 240809A: Swift/UVOT Detection
  43. GRB 240809A: Tentative redshift from NOT
  44. GRB 240809A: Swift-XRT refined Analysis
  45. IPN triangulation of GRB 240807A / EP 240807a
  46. Swift GRB 240809A: Global MASTER-Net observations report
  47. GRB 240809A: JinShan optical observations
  48. GRB 240809A: Enhanced Swift-XRT position
  49. GRB 240809A: Skynet & Photon Ranch Optical Afterglow Observations
  50. GRB 240809A: SVOM/GRM observation
  51. GRB 240808A: SVOM/GRM observation
  52. GRB 240807A: SVOM/GRM observation
  53. GRB 240809A: Swift detection of a burst with a bright optical counterpart
  54. EP-WXT trigger 01709018832: SVOM/C-GFT observations of the star flare
  55. EP240807a: STEP/T80S optical limits
  56. GRB 240807B: AstroSat CZTI detection of a short burst
  57. GRB 240801A: GRBAlpha detection
  58. GRB 240807B: Fermi GBM Final Localization
  59. GRB 240710B: VZLUSAT-2 detection
  60. GRB 240805A: ATCA Radio Upper Limits
  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. GRB 240710A: VZLUSAT-2 detection
  66. GRB 240807A: Fermi GBM Final Localization
  67. GRB 240805B: GIT optical upper limit
  68. EP240806a: KAIT optical observations
  69. GRB 240805B: Swift-BAT refined analysis
  70. GRB 240805A: Swift-BAT refined analysis
  71. EP240804a (GRB 240804B): NOT optical observations
  72. Konus-Wind detection of GRB 240802A (EP240802a)
  73. Improved IPN triangulation of GRB 240802A / EP 240802a
  74. Konus-Wind detection of GRB 240805A
  75. GRB 240805B Bassano Bresciano Observatory upper limit
  76. GRB240805A: Fermi GBM Observation
  77. GRB 240805B: JinShan optical afterglow detection
  78. GRB 240804B/EP240804a: Correction to the GRB name in GCN 37071
  79. GRB 240805B: AbAO, CrAO, and Terskol optical upper limits
  80. Konus-Wind detection of GRB 240804B (a counterpart of EP240804a)
  81. Fermi Gamma-ray Burst Monitor trigger 240806402/744629911 is not a GRB
  82. GRB 240626B: VZLUSAT-2 detection
  83. GRB 240624B: VZLUSAT-2 detection
  84. GRB 240619C: VZLUSAT-2 detection
  85. EP 240806A: LCO optical observations
  86. GRB 240805B: Optical detection with 1.6m Mephisto
  87. GRB 240805B: NUTTelA-TAO / BSTI Optical Limits
  88. GRB 240805B: Swift-XRT refined Analysis
  89. GRB 240805B: Swift/UVOT Upper Limits
  90. GRB 240805A: Swift/UVOT Upper Limits
  91. GRB 240805B: BTA optical afterglow candidate
  92. GRB 240805A: SVOM/GRM observation
  93. GRB 240805B: Enhanced Swift-XRT position
  94. GRB 240805B: LCOGT Optical Upper Limits
  95. Swift GRB 240805B: Global MASTER-Net observations report
  96. GRB 240805B: JinShan optical upper limits
  97. Fermi GRB 240805A: Global MASTER-Net observations report
  98. Swift GRB 240805A: Global MASTER-Net observations report
  99. Fermi Gamma-ray Burst Monitor trigger 744558410/240805574 is not a GRB
  100. GRB 240805A: Swift-XRT refined Analysis

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