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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"

18434 results found.

  1. Swift Trigger 420256: IAC80 R-band observations
  2. Swift Trigger 420256: BOOTES-2 observations
  3. Swift Trigger 420256: ROTSE-III Optical Limits
  4. Trigger 420256: Swift detection of a possible GRB
  5. GRB 100423A: Skynet/PROMPT Detections
  6. GRB 100423A: GROND discovery of afterglow
  7. GRB 100423A: Swift detection of a burst
  8. Radio afterglow detection of GRB 100418A with the EVLA
  9. GRB 100418A: Continued PAIRITEL NIR Observations
  10. GRB 100418A: Continuing Swift/UVOT Observations
  11. GRB 100420A: Swift/UVOT Upper Limits
  12. GRB 100420A: XRT refined analysis
  13. GRB 100420A: Enhanced Swift-XRT position
  14. GRB 100418A: optical observations
  15. GRB 100418A: MASTER-Net optical observations
  16. GRB 100414A: Confirmation of the X-ray afterglow
  17. GRB 100420A: ROTSE-III Optical Limits
  18. GRB 100420A: Swift detection of a burst
  19. GRB 100418A PAIRITEL NIR Observations
  20. GRB 100418A: ROVOR optical afterglow detection
  21. GRB 100418A: Swift/UVOT Observations
  22. GRB 100418A: Gemini-N redshift confirmation
  23. GRB 100418A: Swift-XRT Refined Analysis
  24. GRB 100418A: Swift-BAT refined analysis
  25. GRB 100418A: Enhanced Swift-XRT position
  26. GRB 100418A: ROTSE-III Optical Limits
  27. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  28. GRB 100413A: Radio Afterglow Detection with the EVLA
  29. GRB 100414A: Swift/UVOT Observations
  30. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  31. GRB 100413A: Suzaku WAM observation of the prompt emission
  32. GRB 100413B: Swift Confirmation of Burst
  33. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  34. GRB 100413A: Swift-BAT final refined analysis
  35. GRB 100414A: IPN Localization
  36. GRB 100413B : Swift detection of a burst
  37. GRB 100413A: GROND Upper limits
  38. GRB 100413A: Swift/UVOT Upper Limits
  39. Konus-Wind observation of GRB 100413A
  40. GRB 100413A: Faulkes Telescope South observations
  41. Tentative redshift of GRB100413A from X-ray data
  42. GRB 100413A: Swift-XRT Refined Analysis
  43. GRB 100413A: Swift-BAT initial refined analysis
  44. GRB 100413A: Enhanced Swift-XRT position
  45. GRB 100413A: MASTER-Net optical observations
  46. GRB 100413A: Swift detection of a burst
  47. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  48. Swift-BAT trigger 419015 is not astrophysical
  49. Trigger 419015 is probably not a GRB
  50. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  51. MASTER observations on the Swift second trigger on LS V +44 17
  52. GRB 100331B: GROND Upper limits
  53. Master-Net observations on the Swift trigger on LS V +44 17
  54. GRB 100401A: Swift/UVOT Upper Limit
  55. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  56. GRB 100401A: Fermi GBM detection
  57. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  58. GRB 100331B: BOOTES-3 observations
  59. GRB 100331B: Swift/UVOT Upper Limits
  60. GRB 100331B: Swift/XRT possible afterglow candidate
  61. Swift detection of LS V +44 17
  62. INTEGRAL trigger 5994 (GRB100331A): Swift/XRT observations
  63. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  64. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  65. GROND observations of GRB100316D/SN2010bh
  66. GRB 100324A: GROND observations
  67. GRB 100324A found in ground analysis of BAT data
  68. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  69. SGR 1833-0832: Swift/UVOT Upper Limits
  70. SGR 1833-0832: Archival Chandra Observations
  71. SGR 1833-0832 is pulsed at 7.56 seconds
  72. SGR 1833-0832 is pulsed at 7.56 seconds
  73. Discovery of the Spin Period of SGR 1833-0832
  74. GRB 100319A: correction to GCN 10527
  75. Probable SGR 1833-0832: Swift-XRT refined analysis
  76. Probable SGR 1833-0832: Enhanced Swift-XRT position
  77. Swift-XRT refined position of the probable new SGR 1833-0832
  78. Swift-BAT refined analysis of the probable new SGR 1833-0832
  79. GRB 100219A: MASTER-Net optical alert observations
  80. GRB 100319A: Swift detection of a burst; possible SGR
  81. GRB 100316D: Pre-burst emission measured by BAT
  82. GRB 100219A: optical upper limit
  83. GRB 100316A: optical observations in CrAO
  84. GRB 100316D: Swift/UVOT Observations
  85. GRB 100316D: Swift XRT enhanced position and further refined analysis
  86. GRB 100316B: Swift-XRT refined analysis
  87. Tentative redshift of GRB100316D from X-ray data
  88. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  89. Trigger 416226 is probably not a GRB
  90. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  91. GRB 100316D: Swift-BAT refined analysis
  92. GRB100316C: Swift/UVOT Upper Limits
  93. GRB 100316C: Swift-BAT refined analysis
  94. GRB 100316B: Swift/UVOT observations
  95. GRB 100316C: Swift-XRT team refined analysis
  96. GRB 100316C: Enhanced Swift-XRT position
  97. GRB 100316D: Swift XRT refined analysis
  98. GRB 100316A: TAROT Calern observatory optical observations
  99. GRB 100316A: Swift-XRT refined analysis
  100. GRB 100316B: Enhanced Swift-XRT position

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