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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"

28203 results found.

  1. GRB 240825A: GECAM detection
  2. GRB 240825A: ALMA detection
  3. GRB 240825A: SAO RAS optical observations
  4. GRB 240824A: GIT optical upper limit
  5. GRB 240819A: Swift afterglow confirmation
  6. GRB 240825A: TNG optical photometry and spectroscopy
  7. GRB 240824B: Ondrejov D50 optical limit
  8. GRB 240825A: KAIT optical observations
  9. GRB 240825A: PRIME near-infrared detection
  10. Konus-Wind detection of GRB 240825A (bright/long)
  11. GRB 240825A : MISTRAL/T193 OHP optical follow-up of the afterglow
  12. GRB 240825A: AKO Optical Follow-Up Observations
  13. GRB 240825A: AstroSat CZTI detection of the long bright burst
  14. GRB 240825A: Swift/UVOT Detection
  15. GRB 240825A: REM detection of the optical/NIR afterglow
  16. GRB 240825A: Swift-XRT refined Analysis
  17. GRB 240825A: VLT/X-shooter redshift
  18. GRB 240825A: SVOM/C-GFT optical observations
  19. GRB 240825A: Enhanced Swift-XRT position
  20. GRB 240825A: Fermi-LAT detection
  21. GRB 240825A: LCO optical observations
  22. GRB 240824B: KAIT optical upper limit
  23. GRB 240824B: Fermi GBM Observation
  24. GRB 240824B: NOT optical upper limit
  25. GRB 240825A: 1.6m Mephisto multi-band detection
  26. GRB 240825A: AKO Optical Afterglow Detection
  27. GRB 240825A: Skynet Optical Afterglow observations
  28. GRB 240825A: Nanshan/HMT optical afterglow observations
  29. GRB 240825A: Swift detection of a burst with a bright optical counterpart
  30. GRB 240825A: Fermi GBM Final Real-time Localization
  31. GRB 240824A: SVOM/C-GFT optical upper limit
  32. GRB 240824B: Swift-XRT afterglow detection
  33. GRB 240824A: Swift-XRT observations
  34. GRB 240824B: Swift/BAT arcminute localization of a burst
  35. GRB 240824B: Swift ToO observations
  36. GRB 240824C: Fermi GBM Final Localization
  37. GRB 240824A: Swift/UVOT Upper Limits
  38. GRB 240821A: Swift/UVOT observations of the XRT sources.
  39. GRB 240824B: MAXI/GSC detection
  40. GRB 240824B: Fermi GBM Final Real-time Localization
  41. GRB 240824A: Retraction of GCN 37255
  42. GRB240824A: GRANDMA/TAROT-TCA Upper Limit
  43. GRB 240824A: KAIT optical upper limit
  44. GRB 240824A: Skynet Optical Afterglow Discovery
  45. GRB 240824A: Swift detection of a burst
  46. GRB 240821A: Colibri Optical Upper Limit
  47. EP240820a: PRIME J-band Observations
  48. GRB 240821A: Swift-XRT observations
  49. GRB 240822A: AstroSat CZTI detection of a short burst
  50. GRB 240821A: REM optical/NIR upper limits
  51. GRB 240821A: JinShan optical upper limits
  52. GRB 240821A: SVOM/VT follow-up and optical upper limit
  53. GRB 240821A: GMG Optical Upper Limit
  54. GRB 240821A: Swift ToO observations
  55. GRB240821A: EIRSAT-1 GMOD Detection
  56. GRB240821B: First GRB Detected by EIRSAT-1 GMOD
  57. GRB 240821A: EP-FXT follow-up observation and afterglow candidates
  58. EP240801a: Keck/LRIS spectroscopic redshift confirmation
  59. GRB 240821B: Fermi GBM Final Localization
  60. Trigger 1249878: Swift detection of another burst from SGR 1E 1841-045 / Kes 73
  61. GRB 240821A : a likely short GRB detected by SVOM/ECLAIRs
  62. GRB 240821A: Fermi GBM Final Real-time Localization
  63. GRB 240819A: Swift-XRT observations
  64. GRB 240819A: JinShan optical upper limits on one Swift/XRT source
  65. EP240820a: EP detection of a fast X-ray transient
  66. GRB 240819A: KAIT optical upper limit
  67. EP240816a: PRIME upper limits
  68. Trigger 1249653: Swift detection of SGR 1E 1841-045 / Kes 73
  69. GRB 240819A: TRT optical upper limits on the Swift/XRT and EP/FXT sources
  70. GRB 240820A: Fermi GBM Final Real-time Localization
  71. GRB 240819A: Swift ToO observations
  72. EP240816a: BOOTES-6/DPRT optical upper limit
  73. GRB 240817A: Fermi GBM Final Real-time Localization
  74. GRB GRB 240809A: Osservatorio Astronomico "Nastro Verde" optical observations: detection of an optical counterpart
  75. GRB 240814B: GRBAlpha detection
  76. EP240816a: EP detection of a fast X-ray transient and follow-up observation
  77. EP240816b: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  78. GRB 240814C: Fermi GBM Final Real-time Localization
  79. GRB 240812B: SVOM/GRM observation
  80. EP240802a: Kinder optical, SWIFT-UVOT, and SWIFT-XRT upper limits 6 days after the WXT detection
  81. GRB 240814B: Fermi GBM Final Real-time Localization
  82. GRB 240814A: Fermi GBM Final Real-time Localization
  83. Konus-Wind detection of GRB 240811A
  84. Konus-Wind detection of GRB 240810A
  85. GRB 240809A: ATA radio non-detection
  86. GRB 240812D: Fermi GBM Final Real-time Localization
  87. GRB 240812C: Fermi GBM Final Real-time Localization
  88. GRB 240809A : RAPAS follow-up observations
  89. GRB 240809A: VLA detection
  90. GRB 240809A: ALMA detection
  91. IPN triangulation of GRB 240810A (short)
  92. EP240807a: PRIME H-band upper limits
  93. GRB 240812B: AstroSat CZTI detection of a long burst
  94. GRB 240811A: Swift-XRT refined Analysis
  95. GRB 240811A: Swift/UVOT Upper Limits
  96. GRB 240812A: Fermi GBM Final Real-time Localization
  97. GRB 240811A: LCOGT Optical Upper Limit
  98. GRB 240811A: Enhanced Swift-XRT position
  99. Konus-Wind detection of GRB 240809A
  100. GRB 240811A: Swift detection of a burst

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