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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"

28233 results found.

  1. GRB 100424A: Prompt enhanced Swift-XRT position.
  2. GRB 100424A: Swift detection of a burst
  3. GRB 100420A: GRT Optical Observation
  4. Swift Trigger 420256: D50 optical limits
  5. GRB 100423B: Fermi GBM detection
  6. GRB 100423A: Swift-BAT refined analysis
  7. Swift Trigger 420256: IAC80 R-band observations
  8. Swift Trigger 420256: BOOTES-2 observations
  9. Trigger 420256: Swift detection of a possible GRB
  10. GRB 100423A: GROND discovery of afterglow
  11. GRB 100418A: Continued PAIRITEL NIR Observations
  12. GRB100418A: REM possible afterglow detection
  13. GRB 100418A: Continuing Swift/UVOT Observations
  14. GRB100420A: MITSuME optical upper limits
  15. GRB 100414A: CFHT optical observations
  16. GRB 100420A: Swift/UVOT Upper Limits
  17. GRB 100420A: XRT refined analysis
  18. GRB 100420A: Enhanced Swift-XRT position
  19. GRB 100418A: SARA second epoch
  20. GRB 100420A: SARA Upper Limits
  21. GRB 100418A: optical observations
  22. GRB 100414A: Confirmation of the X-ray afterglow
  23. GRB 100418A: SMA submm detection
  24. GRB 100420A: Swift detection of a burst
  25. GRB 100418A PAIRITEL NIR Observations
  26. GRB 100418A: Swift/UVOT Observations
  27. GRB 100418A: Gemini-N redshift confirmation
  28. GRB 100418A: Swift-XRT Refined Analysis
  29. GRB100418A: VLT/X-shooter redshift and photometry
  30. GRB 100418A: SARA observations
  31. GRB 100418A: GROND observations; missing author list added
  32. GRB 100418A: GROND observations
  33. GRB 100418A: Swift-BAT refined analysis
  34. GRB 100418A: Enhanced Swift-XRT position
  35. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  36. GRB 100413A: Radio Afterglow Detection with the EVLA
  37. GRB 100414A: Suzaku WAM observation of the prompt emission
  38. GRB 100414A: Swift/UVOT Observations
  39. GRB 100414A: GROND Detection of the Optical Afterglow
  40. GRB 100414A: Gemini-N candidate and redshift
  41. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  42. GRB 100413A: Suzaku WAM observation of the prompt emission
  43. GRB 100414A: Palomar Transient Factory Observations
  44. GRB 100413B: Swift Confirmation of Burst
  45. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  46. GRB 100413A: Swift-BAT final refined analysis
  47. GRB 100414A: Fermi GBM detection
  48. GRB100414A: Fermi LAT detection
  49. GRB 100413A: GROND Upper limits
  50. GRB 100413A: Swift/UVOT Upper Limits
  51. Konus-Wind observation of GRB 100413A
  52. GRB 100413A: Faulkes Telescope South observations
  53. GRB 100413A: SARA upper limit
  54. GRB 100413A: Swift-XRT Refined Analysis
  55. GRB 100413A: Swift-BAT initial refined analysis
  56. GRB 100413A: Enhanced Swift-XRT position
  57. GRB 100413A: Swift detection of a burst
  58. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  59. Trigger 419015 is probably not a GRB
  60. GRB100401A: GROND Upper Limits
  61. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  62. GRB 100331B: GROND Upper limits
  63. GRB 100401A: Fermi GBM detection
  64. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  65. GRB 100331B: BOOTES-3 observations
  66. GRB 100324B: Suzaku WAM observation of the prompt emission
  67. GRB 100331B: Swift/UVOT Upper Limits
  68. GRB 100331B: Swift/XRT possible afterglow candidate
  69. Swift detection of LS V +44 17
  70. GRB 100331B: SuperAGILE Localization of a Long GRB
  71. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  72. GRB 100331A: BOOTES-3 observations
  73. GRB 100331A: A long GRB detected by INTEGRAL
  74. GRB 100322A: Suzaku WAM observation of the prompt emission
  75. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  76. GRB 100325A: Fermi LAT detection
  77. GROND observations of GRB100316D/SN2010bh
  78. GRB 100325A: Fermi GBM detection
  79. GRB 100324A: GROND observations
  80. GRB 100324A found in ground analysis of BAT data
  81. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  82. SGR 1833-0832: Swift/UVOT Upper Limits
  83. GRB 100322A: Fermi GBM detection
  84. SGR 1833-0832: Archival Chandra Observations
  85. Discovery of the Spin Period of SGR 1833-0832
  86. GRB 100316D: ATCA radio observations
  87. Probable SGR 1833-0832: Swift-XRT refined analysis
  88. Probable SGR 1833-0832: Enhanced Swift-XRT position
  89. Swift-BAT refined analysis of the probable new SGR 1833-0832
  90. GRB 100219A: MASTER-Net optical alert observations
  91. GRB 100319A: Swift detection of a burst; possible SGR
  92. GRB 100316D: Possible Supernova
  93. GRB 100219A: optical upper limit
  94. GRB 100316A: optical observations in CrAO
  95. GRB 100316D: Swift/UVOT Observations
  96. GRB 100316D: Swift XRT enhanced position and further refined analysis
  97. GRB 100316B: Swift-XRT refined analysis
  98. Tentative redshift of GRB100316D from X-ray data
  99. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  100. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate

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