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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"

19663 results found.

  1. GRB 240825A: Swift-XRT refined Analysis
  2. GRB 240825A: VLT/X-shooter redshift
  3. GRB 240825A: SVOM/C-GFT optical observations
  4. GRB 240825A: Montarrenti Observatory optical observations
  5. GRB 240825A: Enhanced Swift-XRT position
  6. GRB 240825A: MASTER optical counterpart observation
  7. GRB 240825A: Fermi-LAT detection
  8. GRB 240825A: LCO optical observations
  9. GRB 240824B: KAIT optical upper limit
  10. GRB 240824B: Fermi GBM Observation
  11. GRB 240825A: GMG Optical Observation
  12. Swift GRB 240825A: Global MASTER-Net observations report
  13. GRB 240825A: 1.6m Mephisto multi-band detection
  14. GRB 240825A: AKO Optical Afterglow Detection
  15. GRB 240825A: Skynet Optical Afterglow observations
  16. GRB 240825A: Nanshan/HMT optical afterglow observations
  17. GRB 240825A: Swift detection of a burst with a bright optical counterpart
  18. GRB 240824A: Swift-BAT refined analysis
  19. GRB 240824A: SVOM/C-GFT optical upper limit
  20. GRB 240824B: Swift-XRT afterglow detection
  21. GRB 240824A: Swift-XRT observations
  22. GRB 240824B: Swift/BAT arcminute localization of a burst
  23. GRB 240824B: Swift ToO observations
  24. GRB 240824A: Swift/UVOT Upper Limits
  25. GRB 240821A: Swift/UVOT observations of the XRT sources.
  26. GRB240824A: GRANDMA/TAROT-TCA Upper Limit
  27. SGR 1E 1841-045 / Kes 73: Leavitt Observatory optical upper limit
  28. GRB 240824A: KAIT optical upper limit
  29. GRB 240824A: Skynet Optical Afterglow Discovery
  30. GRB 240824A: Swift detection of a burst
  31. Swift GRB240824.04: Global MASTER-Net observations report
  32. SGR 1E 1841-045 / Kes 73: Montarrenti Observatory optical upper limits
  33. GRB 240821A: Colibri Optical Upper Limit
  34. GRB 240821A: Swift-XRT observations
  35. GRB 240821A: REM optical/NIR upper limits
  36. GRB 240821A: JinShan optical upper limits
  37. GRB 240809A: Mondy and AbAO Optical Observations
  38. GRB 240821A: SVOM/VT follow-up and optical upper limit
  39. GRB 240821A: GMG Optical Upper Limit
  40. GECAM-B observation of a short burst from SGR 1E 1841-045 / Kes 73
  41. GRB 240821A: Swift ToO observations
  42. Fermi-GBM Observations of the reactivation of SGR 1E 1841-045 / Kes 73
  43. Trigger 1249878: Swift detection of another burst from SGR 1E 1841-045 / Kes 73
  44. GRB 240819A: Swift-XRT observations
  45. GRB 240819A: JinShan optical upper limits on one Swift/XRT source
  46. GRB 240819A: KAIT optical upper limit
  47. Trigger 1249653: Swift detection of SGR 1E 1841-045 / Kes 73
  48. GRB 240819A : an X-ray transient detected by SVOM/ECLAIRs
  49. GRB 240819A: TRT optical upper limits on the Swift/XRT and EP/FXT sources
  50. GRB 240819A: Swift ToO observations
  51. GRB GRB 240809A: Osservatorio Astronomico "Nastro Verde" optical observations: detection of an optical counterpart
  52. GRB 240805B: Osservatorio Astronomico Nastro Verde upper limit
  53. EP240802a: Kinder optical, SWIFT-UVOT, and SWIFT-XRT upper limits 6 days after the WXT detection
  54. Konus-Wind detection of GRB 240811A
  55. GRB 240811A: Swift-BAT refined analysis
  56. GRB 240809A: Swift-BAT refined analysis
  57. GRB 240811A: Bassano Bresciano Observatory upper limit
  58. GRB 240811A: Swift-XRT refined Analysis
  59. GRB 240811A: Swift/UVOT Upper Limits
  60. GRB 240811A: LCOGT Optical Upper Limit
  61. GRB 240811A: Enhanced Swift-XRT position
  62. Konus-Wind detection of GRB 240809A
  63. Swift GRB 240811A: Global MASTER-Net observations report
  64. GRB 240811A: Swift detection of a burst
  65. GRB 240809A: Bassano Bresciano Observatory optical observations
  66. GRB 240809A: KAIT optical observations
  67. GRB 240809A: GIT afterglow observations
  68. GRB 240809A: Swift/UVOT Detection
  69. GRB 240809A: Swift-XRT refined Analysis
  70. IPN triangulation of GRB 240807A / EP 240807a
  71. Swift GRB 240809A: Global MASTER-Net observations report
  72. GRB 240809A: JinShan optical observations
  73. GRB 240809A: Enhanced Swift-XRT position
  74. GRB 240809A: Skynet & Photon Ranch Optical Afterglow Observations
  75. GRB 240809A: SVOM/GRM observation
  76. GRB 240809A: Swift detection of a burst with a bright optical counterpart
  77. GRB 240805A: ATCA Radio Upper Limits
  78. GRB 240805B: GIT optical upper limit
  79. GRB 240805B: Swift-BAT refined analysis
  80. GRB 240805A: Swift-BAT refined analysis
  81. Konus-Wind detection of GRB 240805A
  82. GRB 240805B Bassano Bresciano Observatory upper limit
  83. GRB240805A: Fermi GBM Observation
  84. GRB 240805B: JinShan optical afterglow detection
  85. GRB 240805B: AbAO, CrAO, and Terskol optical upper limits
  86. GRB 240805B: Swift-XRT refined Analysis
  87. GRB 240805B: Swift/UVOT Upper Limits
  88. GRB 240805A: Swift/UVOT Upper Limits
  89. GRB 240805A: SVOM/GRM observation
  90. GRB 240805B: Enhanced Swift-XRT position
  91. GRB 240805B: LCOGT Optical Upper Limits
  92. Swift GRB 240805B: Global MASTER-Net observations report
  93. GRB 240805B: JinShan optical upper limits
  94. Swift GRB 240805A: Global MASTER-Net observations report
  95. GRB 240805A: Swift-XRT refined Analysis
  96. GRB 240805B: Swift detection of a burst
  97. GRB 240805A: Fermi-LAT detection
  98. GRB 240805A: INTEGRAL spectral analysis
  99. GRB 240805A: A long GRB detected by INTEGRAL
  100. GRB 240805A: Swift detection of a burst

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