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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"

11801 results found.

  1. GRB 100504A: GROND Upper limits
  2. GRB 100504A: SARA-South Upper Limit
  3. GRB 100504A: Swift detection of a burst
  4. INTEGRAL observations of Swift GRB trigger 421072
  5. GRB 100420A: Gemini discovery of infrared afterglow
  6. GRB 100420A: Terskol optical upper limit
  7. GRB 100418A: RTT150 optical observations
  8. Konus-Wind observation of GRB 100423A
  9. GRB 100418A: Terskol optical observations
  10. GRB 100425A: Swift XRT refined analysis
  11. GRB 100424A: Liverpool Telescope Upper Limits
  12. GRB 100425A: GROND afterglow observation
  13. GRB 100424A: D50 optical limits
  14. GRB 100424A: GROND Upper Limits
  15. GRB 100424A: Swift-XRT refined analysis
  16. GRB 100425A: Swift detection of a burst
  17. GRB 100424A, Swift-BAT refined analysis
  18. GRB 100420A: GRT Optical Observation
  19. GRB 100418A: ROVOR optical measurements at 35 hours
  20. Swift Trigger 420256: ROTSE-III Optical Limits
  21. Radio afterglow detection of GRB 100418A with the EVLA
  22. GRB 100418A: Continued PAIRITEL NIR Observations
  23. GRB 100418A: WSRT Radio Detection
  24. GRB 100418A: RTT150 optical observations
  25. GRB100420A: MITSuME optical upper limits
  26. GRB 100414A: CFHT optical observations
  27. GRB 100420A: SARA Upper Limits
  28. GRB 100418A: RTT150 observations during the optical afterglow maximum
  29. GRB 100418A: SMA submm detection
  30. GRB 100420A: ROTSE-III Optical Limits
  31. GRB 100418A: Swift-XRT Refined Analysis
  32. GRB100414A: SAO RAS optical observations
  33. GRB 100418A: ROTSE-III Optical Limits
  34. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  35. GRB 100414A: Suzaku WAM observation of the prompt emission
  36. Konus-Wind observation of GRB 100414B
  37. GRB 100415A: MAXI/GSC detection of a probable GRB
  38. GRB 100414A: Fermi GBM detection
  39. GRB100414A: Fermi LAT detection
  40. Konus-Wind observation of GRB 100413A
  41. Tentative redshift of GRB100413A from X-ray data
  42. GRB 100413A: Swift-XRT Refined Analysis
  43. GRB 100413: xinglong TNT optical upper limit
  44. GRB 100413A: MASTER-Net optical observations
  45. GRB 100413A: Swift detection of a burst
  46. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  47. GRB100401A: GROND Upper Limits
  48. MASTER observations on the Swift second trigger on LS V +44 17
  49. GRB 100331B: Swift/XRT possible afterglow candidate
  50. GRB 100331B: SuperAGILE Localization of a Long GRB
  51. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  52. Konus-Wind observation of GRB 100324B
  53. GRB 100331A: A long GRB detected by INTEGRAL
  54. Konus-Wind observation of GRB 100322A
  55. Short X-ray Transient detected by MAXI/GSC
  56. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  57. GRB 100325A: Fermi LAT detection
  58. GRB 100324A: GROND observations
  59. SGR 1833-0832: Swift/UVOT Upper Limits
  60. SGR 1833-0832: Archival Chandra Observations
  61. SGR 1833-0832 is pulsed at 7.56 seconds
  62. SGR 1833-0832 is pulsed at 7.56 seconds
  63. Possible pulsation period in SGR 1833-0832
  64. Discovery of the Spin Period of SGR 1833-0832
  65. GRB 100319A: correction to GCN 10527
  66. Probable SGR 1833-0832: Swift-XRT refined analysis
  67. Probable SGR 1833-0832: Enhanced Swift-XRT position
  68. Swift-XRT refined position of the probable new SGR 1833-0832
  69. Swift-BAT refined analysis of the probable new SGR 1833-0832
  70. GRB 100219A: MASTER-Net optical alert observations
  71. GRB 100319A: Swift detection of a burst; possible SGR
  72. GRB 100316D: Further Gemini observations
  73. GRB 100316B: Swift-XRT refined analysis
  74. Tentative redshift of GRB100316D from X-ray data
  75. GRB 100316C: Swift-XRT team refined analysis
  76. GRB 100316D: Swift XRT refined analysis
  77. GRB 100316A: Swift-XRT refined analysis
  78. GRB 100316A: Swift-BAT refined analysis
  79. GRB 100316B: Swift-BAT refined analysis
  80. GRB 100316C: BOOTES-3 observations
  81. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  82. GRB 100316C: Swift detection of a burst
  83. GRB 100316B: Swift detection of a burst with optical counterpart
  84. GRB 100305A: Super-LOTIS early observations
  85. GRB 100305A: Swift-XRT refined analysis
  86. GRB 100305A Optical Observations
  87. GRB 100305A: Swift detection of a burst
  88. GRB 100302A: Swift-XRT refined analysis
  89. GRB 100302A: Optical observations at Crni Vrh
  90. GRB 100302A: Swift detection of a burst
  91. GRB 100224A SHB found in ground analysis of BAT data
  92. GRB 100225A: Fermi LAT detection
  93. GRB 100225A: Fermi GBM detection
  94. GRB
  95. GRB 100219A: XRT refined analysis
  96. GRB 100219A - Gemini South Spectroscopy
  97. GRB100219A Akeno and Okayama MITSuME Optical Observation
  98. GRB 100219A: GROND observations
  99. GRB 100219A: Swift detection of a burst
  100. GRB 100213B: Swift XRT refined analysis

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