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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"

28232 results found.

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

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