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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

11074 results found.

  1. INTEGRAL observations of Swift GRB trigger 421072
  2. GRB 100420A: Gemini discovery of infrared afterglow
  3. GRB 100420A: Terskol optical upper limit
  4. GRB 100418A: RTT150 optical observations
  5. Konus-Wind observation of GRB 100423A
  6. GRB 100418A: Terskol optical observations
  7. GRB 100425A: Swift XRT refined analysis
  8. GRB 100424A: Liverpool Telescope Upper Limits
  9. GRB 100425A: GROND afterglow observation
  10. GRB 100424A: D50 optical limits
  11. GRB 100424A: GROND Upper Limits
  12. GRB 100424A: Swift-XRT refined analysis
  13. GRB 100425A: Swift detection of a burst
  14. GRB 100424A, Swift-BAT refined analysis
  15. GRB 100420A: GRT Optical Observation
  16. GRB 100418A: ROVOR optical measurements at 35 hours
  17. Swift Trigger 420256: ROTSE-III Optical Limits
  18. Radio afterglow detection of GRB 100418A with the EVLA
  19. GRB 100418A: Continued PAIRITEL NIR Observations
  20. GRB 100418A: WSRT Radio Detection
  21. GRB 100418A: RTT150 optical observations
  22. GRB100420A: MITSuME optical upper limits
  23. GRB 100414A: CFHT optical observations
  24. GRB 100420A: SARA Upper Limits
  25. GRB 100418A: RTT150 observations during the optical afterglow maximum
  26. GRB 100418A: SMA submm detection
  27. GRB 100420A: ROTSE-III Optical Limits
  28. GRB 100418A: Swift-XRT Refined Analysis
  29. GRB100414A: SAO RAS optical observations
  30. GRB 100418A: ROTSE-III Optical Limits
  31. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  32. GRB 100414A: Suzaku WAM observation of the prompt emission
  33. Konus-Wind observation of GRB 100414B
  34. GRB 100415A: MAXI/GSC detection of a probable GRB
  35. GRB 100414A: Fermi GBM detection
  36. GRB100414A: Fermi LAT detection
  37. Konus-Wind observation of GRB 100413A
  38. Tentative redshift of GRB100413A from X-ray data
  39. GRB 100413A: Swift-XRT Refined Analysis
  40. GRB 100413: xinglong TNT optical upper limit
  41. GRB 100413A: MASTER-Net optical observations
  42. GRB 100413A: Swift detection of a burst
  43. GRB100401A: GROND Upper Limits
  44. MASTER observations on the Swift second trigger on LS V +44 17
  45. GRB 100331B: Swift/XRT possible afterglow candidate
  46. GRB 100331B: SuperAGILE Localization of a Long GRB
  47. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  48. Konus-Wind observation of GRB 100324B
  49. GRB 100331A: A long GRB detected by INTEGRAL
  50. Konus-Wind observation of GRB 100322A
  51. Short X-ray Transient detected by MAXI/GSC
  52. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  53. GRB 100325A: Fermi LAT detection
  54. GRB 100324A: GROND observations
  55. SGR 1833-0832: Archival Chandra Observations
  56. Discovery of the Spin Period of SGR 1833-0832
  57. GRB 100319A: correction to GCN 10527
  58. GRB 100219A: MASTER-Net optical alert observations
  59. GRB 100316D: Further Gemini observations
  60. GRB 100316B: Swift-XRT refined analysis
  61. Tentative redshift of GRB100316D from X-ray data
  62. GRB 100316C: Swift-XRT team refined analysis
  63. GRB 100316D: Swift XRT refined analysis
  64. GRB 100316A: Swift-XRT refined analysis
  65. GRB 100316A: Swift-BAT refined analysis
  66. GRB 100316B: Swift-BAT refined analysis
  67. GRB 100316C: BOOTES-3 observations
  68. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  69. GRB 100316C: Swift detection of a burst
  70. GRB 100316B: Swift detection of a burst with optical counterpart
  71. GRB 100305A: Super-LOTIS early observations
  72. GRB 100305A: Swift-XRT refined analysis
  73. GRB 100305A Optical Observations
  74. GRB 100305A: Swift detection of a burst
  75. GRB 100302A: Swift-XRT refined analysis
  76. GRB 100302A: Optical observations at Crni Vrh
  77. GRB 100302A: Swift detection of a burst
  78. GRB 100224A SHB found in ground analysis of BAT data
  79. GRB 100225A: Fermi LAT detection
  80. GRB 100225A: Fermi GBM detection
  81. GRB
  82. GRB 100219A: XRT refined analysis
  83. GRB 100219A - Gemini South Spectroscopy
  84. GRB100219A Akeno and Okayama MITSuME Optical Observation
  85. GRB 100219A: GROND observations
  86. GRB 100219A: Swift detection of a burst
  87. GRB 100213B: Swift XRT refined analysis
  88. GRB 100213A: SARA observations
  89. GRB 100205A: Keck limits on an underlying host galaxy
  90. GRB 100206A: YNAO-GMG observations
  91. GRB 100206A: WHT candidate afterglow
  92. GRB 100205A: Swift XRT refined analysis
  93. GRB 100205A: Swift detection of a burst
  94. Short X-ray Transient detected by MAXI/GSC
  95. Konus-Wind observation of GRB 100119A
  96. GRB 100115A: Swift-XRT refined analysis
  97. Konus-Wind observation of GRB 100116A
  98. GRB 100117A: Swift-XRT refined analysis
  99. GRB 100117A: Swift detection of a short hard burst
  100. GRB 100116A: Fermi LAT detection

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