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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"

26122 results found.

  1. GRB 240828A: Fermi-LAT detection
  2. GRB 240828A: Tiled Swift observations
  3. GRB 240825A: Upper limits from a neutrino search with IceCube
  4. GRB 240819A as a likely X-Ray Flash
  5. GRB 240828B: Swift ToO observations
  6. SVOM GRB 240821A: optical afterglow discovery
  7. GRB 240821A: the second and third EP-FXT follow-up observations and afterglow candidates
  8. GRB 240825A: GECAM detection
  9. GRB 240824A: GIT optical upper limit
  10. GRB 240819A: Swift afterglow confirmation
  11. GRB 240825A: TNG optical photometry and spectroscopy
  12. GRB 240824B: Ondrejov D50 optical limit
  13. GRB 240825A: KAIT optical observations
  14. GRB 240825A: PRIME near-infrared detection
  15. Konus-Wind detection of GRB 240825A (bright/long)
  16. GRB 240825A: Fermi GBM Observation
  17. GRB 240825A : MISTRAL/T193 OHP optical follow-up of the afterglow
  18. GRB 240825A: AKO Optical Follow-Up Observations
  19. GRB 240825A: AstroSat CZTI detection of the long bright burst
  20. SGR 1E 1841-045 / Kes 73: SVOM/GRM observation
  21. GRB 240825A: Swift/UVOT Detection
  22. GRB 240825A: REM detection of the optical/NIR afterglow
  23. GRB 240825A: Swift-XRT refined Analysis
  24. GRB 240825A: VLT/X-shooter redshift
  25. GRB 240825A: SVOM/C-GFT optical observations
  26. GRB 240825A: Montarrenti Observatory optical observations
  27. GRB 240825A: Enhanced Swift-XRT position
  28. GRB 240825A: MASTER optical counterpart observation
  29. GRB 240825A: Fermi-LAT detection
  30. GRB 240825A: LCO optical observations
  31. GRB 240824B: KAIT optical upper limit
  32. GRB 240824B: Fermi GBM Observation
  33. GRB 240824B: NOT optical upper limit
  34. GRB 240825A: GMG Optical Observation
  35. Swift GRB 240825A: Global MASTER-Net observations report
  36. GRB 240825A: 1.6m Mephisto multi-band detection
  37. GRB 240825A: AKO Optical Afterglow Detection
  38. GRB 240825A: Skynet Optical Afterglow observations
  39. GRB 240825A: Nanshan/HMT optical afterglow observations
  40. GRB 240825A: Swift detection of a burst with a bright optical counterpart
  41. GRB 240824A: Swift-BAT refined analysis
  42. GRB 240824A: SVOM/C-GFT optical upper limit
  43. GRB 240824B: Swift-XRT afterglow detection
  44. GRB 240824A: Swift-XRT observations
  45. GRB 240824B: Swift/BAT arcminute localization of a burst
  46. GRB 240824B: Swift ToO observations
  47. GRB 240824A: Swift/UVOT Upper Limits
  48. GRB 240821A: Swift/UVOT observations of the XRT sources.
  49. GRB 240824A: Retraction of GCN 37255
  50. GRB240824A: GRANDMA/TAROT-TCA Upper Limit
  51. SGR 1E 1841-045 / Kes 73: Leavitt Observatory optical upper limit
  52. GRB 240824A: KAIT optical upper limit
  53. GRB 240824A: Skynet Optical Afterglow Discovery
  54. GRB 240824A: Swift detection of a burst
  55. Swift GRB240824.04: Global MASTER-Net observations report
  56. SGR 1E 1841-045 / Kes 73: Montarrenti Observatory optical upper limits
  57. GRB 240821A: Colibri Optical Upper Limit
  58. GRB 240821A: Swift-XRT observations
  59. GRB 240821A: REM optical/NIR upper limits
  60. GRB 240821A: JinShan optical upper limits
  61. GRB 240809A: Mondy and AbAO Optical Observations
  62. GRB 240821A: SVOM/VT follow-up and optical upper limit
  63. GRB 240821A: GMG Optical Upper Limit
  64. GECAM-B observation of a short burst from SGR 1E 1841-045 / Kes 73
  65. GRB 240821A: Swift ToO observations
  66. Fermi-GBM Observations of the reactivation of SGR 1E 1841-045 / Kes 73
  67. GRB 240821A: EP-FXT follow-up observation and afterglow candidates
  68. Trigger 1249878: Swift detection of another burst from SGR 1E 1841-045 / Kes 73
  69. GRB 240819A: Swift-XRT observations
  70. GRB 240819A: JinShan optical upper limits on one Swift/XRT source
  71. GRB 240819A: KAIT optical upper limit
  72. Trigger 1249653: Swift detection of SGR 1E 1841-045 / Kes 73
  73. GRB 240819A : an X-ray transient detected by SVOM/ECLAIRs
  74. GRB 240819A: TRT optical upper limits on the Swift/XRT and EP/FXT sources
  75. GRB 240819A: Swift ToO observations
  76. GRB GRB 240809A: Osservatorio Astronomico "Nastro Verde" optical observations: detection of an optical counterpart
  77. GRB 240805B: Osservatorio Astronomico Nastro Verde upper limit
  78. EP240802a: Kinder optical, SWIFT-UVOT, and SWIFT-XRT upper limits 6 days after the WXT detection
  79. Konus-Wind detection of GRB 240811A
  80. GRB 240809A : RAPAS follow-up observations
  81. GRB 240811A: Swift-BAT refined analysis
  82. GRB 240809A: Swift-BAT refined analysis
  83. GRB 240811A: Bassano Bresciano Observatory upper limit
  84. GRB 240811A: Swift-XRT refined Analysis
  85. GRB 240811A: Swift/UVOT Upper Limits
  86. GRB 240811A: LCOGT Optical Upper Limit
  87. GRB 240811A: Enhanced Swift-XRT position
  88. Konus-Wind detection of GRB 240809A
  89. Swift GRB 240811A: Global MASTER-Net observations report
  90. GRB 240811A: Swift detection of a burst
  91. GRB240809A: Liverpool Telescope optical follow-up observations
  92. GRB 240809A: REM detection of the optical afterglow
  93. GRB 240809A: Bassano Bresciano Observatory optical observations
  94. GRB 240809A: Conclusive redshift from VLT
  95. GRB 240809A: KAIT optical observations
  96. GRB 240809A: GIT afterglow observations
  97. GRB 240809A: Swift/UVOT Detection
  98. GRB 240809A: Tentative redshift from NOT
  99. GRB 240809A: Swift-XRT refined Analysis
  100. IPN triangulation of GRB 240807A / EP 240807a

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