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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"

28126 results found.

  1. Swift Trigger 420256: BOOTES-2 observations
  2. Trigger 420256: Swift detection of a possible GRB
  3. GRB 100423A: GROND discovery of afterglow
  4. GRB 100418A: Continued PAIRITEL NIR Observations
  5. GRB100418A: REM possible afterglow detection
  6. GRB 100418A: Continuing Swift/UVOT Observations
  7. GRB100420A: MITSuME optical upper limits
  8. GRB 100414A: CFHT optical observations
  9. GRB 100420A: Swift/UVOT Upper Limits
  10. GRB 100420A: XRT refined analysis
  11. GRB 100420A: Enhanced Swift-XRT position
  12. GRB 100418A: SARA second epoch
  13. GRB 100420A: SARA Upper Limits
  14. GRB 100418A: optical observations
  15. GRB 100414A: Confirmation of the X-ray afterglow
  16. GRB 100418A: SMA submm detection
  17. GRB 100420A: Swift detection of a burst
  18. GRB 100418A PAIRITEL NIR Observations
  19. GRB 100418A: Swift/UVOT Observations
  20. GRB 100418A: Gemini-N redshift confirmation
  21. GRB 100418A: Swift-XRT Refined Analysis
  22. GRB100418A: VLT/X-shooter redshift and photometry
  23. GRB 100418A: SARA observations
  24. GRB 100418A: GROND observations; missing author list added
  25. GRB 100418A: GROND observations
  26. GRB 100418A: Swift-BAT refined analysis
  27. GRB 100418A: Enhanced Swift-XRT position
  28. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  29. GRB 100413A: Radio Afterglow Detection with the EVLA
  30. GRB 100414A: Suzaku WAM observation of the prompt emission
  31. GRB 100414A: Swift/UVOT Observations
  32. GRB 100414A: GROND Detection of the Optical Afterglow
  33. GRB 100414A: Gemini-N candidate and redshift
  34. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  35. GRB 100413A: Suzaku WAM observation of the prompt emission
  36. GRB 100414A: Palomar Transient Factory Observations
  37. GRB 100413B: Swift Confirmation of Burst
  38. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  39. GRB 100413A: Swift-BAT final refined analysis
  40. GRB 100414A: Fermi GBM detection
  41. GRB100414A: Fermi LAT detection
  42. GRB 100413A: GROND Upper limits
  43. GRB 100413A: Swift/UVOT Upper Limits
  44. Konus-Wind observation of GRB 100413A
  45. GRB 100413A: Faulkes Telescope South observations
  46. GRB 100413A: SARA upper limit
  47. GRB 100413A: Swift-XRT Refined Analysis
  48. GRB 100413A: Swift-BAT initial refined analysis
  49. GRB 100413A: Enhanced Swift-XRT position
  50. GRB 100413A: Swift detection of a burst
  51. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  52. Trigger 419015 is probably not a GRB
  53. GRB100401A: GROND Upper Limits
  54. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  55. GRB 100331B: GROND Upper limits
  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 100324B: Suzaku WAM observation of the prompt emission
  60. GRB 100331B: Swift/UVOT Upper Limits
  61. GRB 100331B: Swift/XRT possible afterglow candidate
  62. Swift detection of LS V +44 17
  63. GRB 100331B: SuperAGILE Localization of a Long GRB
  64. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  65. GRB 100331A: BOOTES-3 observations
  66. GRB 100331A: A long GRB detected by INTEGRAL
  67. GRB 100322A: Suzaku WAM observation of the prompt emission
  68. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  69. GRB 100325A: Fermi LAT detection
  70. GROND observations of GRB100316D/SN2010bh
  71. GRB 100325A: Fermi GBM detection
  72. GRB 100324A: GROND observations
  73. GRB 100324A found in ground analysis of BAT data
  74. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  75. SGR 1833-0832: Swift/UVOT Upper Limits
  76. GRB 100322A: Fermi GBM detection
  77. SGR 1833-0832: Archival Chandra Observations
  78. Discovery of the Spin Period of SGR 1833-0832
  79. GRB 100316D: ATCA radio observations
  80. Probable SGR 1833-0832: Swift-XRT refined analysis
  81. Probable SGR 1833-0832: Enhanced Swift-XRT position
  82. Swift-BAT refined analysis of the probable new SGR 1833-0832
  83. GRB 100219A: MASTER-Net optical alert observations
  84. GRB 100319A: Swift detection of a burst; possible SGR
  85. GRB 100316D: Possible Supernova
  86. GRB 100219A: optical upper limit
  87. GRB 100316A: optical observations in CrAO
  88. GRB 100316D: Swift/UVOT Observations
  89. GRB 100316D: Swift XRT enhanced position and further refined analysis
  90. GRB 100316B: Swift-XRT refined analysis
  91. Tentative redshift of GRB100316D from X-ray data
  92. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  93. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  94. GRB 100316D: Gemini/GMOS and VLT/X-shooter observations
  95. GRB 100316D: VLT/X-shooter observations
  96. GRB 100316D: Swift-BAT refined analysis
  97. GRB100316C: Swift/UVOT Upper Limits
  98. GRB 100316C: Swift-BAT refined analysis
  99. GRB 100316B: Swift/UVOT observations
  100. GRB 100316C: Swift-XRT team refined analysis

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