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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"

42656 results found.

  1. GRB 100418A: Possible Evidence for a Supernova
  2. GRB 100420A: Swift-BAT refined analysis
  3. GRB 100423B: Fermi GBM detection
  4. GRB 100423A: Swift-BAT refined analysis
  5. Swift Trigger 420256: IAC80 R-band observations
  6. Swift Trigger 420256: BOOTES-2 observations
  7. Trigger 420256: Swift detection of a possible GRB
  8. GRB 100423A: Skynet/PROMPT Detections
  9. GRB 100423A: GROND discovery of afterglow
  10. GRB 100423A: Swift detection of a burst
  11. Radio afterglow detection of GRB 100418A with the EVLA
  12. GRB 100414A: Radio Afterglow Detection with the Expanded VLA
  13. GRB 100418A: Continued PAIRITEL NIR Observations
  14. GRB 100418A: WSRT Radio Detection
  15. GRB100418A: REM possible afterglow detection
  16. GRB 100418A: Continuing Swift/UVOT Observations
  17. GRB 100418A: further GROND observations and light curve fit
  18. GRB 100418A: RTT150 optical observations
  19. GRB 100414A: CFHT optical observations
  20. GRB 100420A: XRT refined analysis
  21. GRB 100420A: Enhanced Swift-XRT position
  22. GRB 100420A: SARA Upper Limits
  23. GRB 100418A: RTT150 observations during the optical afterglow maximum
  24. GRB 100418A: optical observations
  25. GRB 100418A: MASTER-Net optical observations
  26. GRB 100414A: Confirmation of the X-ray afterglow
  27. GRB 100418A: SMA submm detection
  28. GRB 100420A: Swift detection of a burst
  29. GRB 100418A PAIRITEL NIR Observations
  30. GRB 100418A: ROVOR optical afterglow detection
  31. GRB 100418A: Swift/UVOT Observations
  32. GRB 100418A: Gemini-N redshift confirmation
  33. GRB 100418A: Swift-XRT Refined Analysis
  34. GRB 100418A: host galaxy detection in the SDSS
  35. GRB100418A: VLT/X-shooter redshift and photometry
  36. GRB 100418A: SARA observations
  37. GRB100414A: SAO RAS optical observations
  38. GRB 100418A: GROND observations; missing author list added
  39. GRB 100418A: GROND observations
  40. GRB 100418A: Swift-BAT refined analysis
  41. GRB 100418A: Enhanced Swift-XRT position
  42. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  43. GRB 100413A: Radio Afterglow Detection with the EVLA
  44. GRB 100414A: Suzaku WAM observation of the prompt emission
  45. GRB 100414A: Swift/UVOT Observations
  46. GRB 100414A: Gemini-N observation (correction)
  47. GRB 100414A: GROND Detection of the Optical Afterglow
  48. GRB 100414A: Gemini-N candidate and redshift
  49. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  50. GRB 100413A: Suzaku WAM observation of the prompt emission
  51. GRB 100414A: Palomar Transient Factory Observations
  52. GRB 100413B: Swift Confirmation of Burst
  53. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  54. GRB 100413A: Swift-BAT final refined analysis
  55. GRB 100414A: IPN Localization
  56. Konus-Wind observation of GRB 100414B
  57. GRB 100415A: MAXI/GSC detection of a probable GRB
  58. GRB 100414A: Fermi GBM detection
  59. GRB100414A: Fermi LAT detection
  60. GRB 100413B : Swift detection of a burst
  61. GRB 100413A: GROND Upper limits
  62. Konus-Wind observation of GRB 100413A
  63. GRB 100413A: Faulkes Telescope South observations
  64. Tentative redshift of GRB100413A from X-ray data
  65. GRB 100413A: SARA upper limit
  66. GRB 100413A: Swift-XRT Refined Analysis
  67. GRB 100413A: Swift-BAT initial refined analysis
  68. GRB 100413A: Enhanced Swift-XRT position
  69. GRB 100413: xinglong TNT optical upper limit
  70. GRB 100413A: MASTER-Net optical observations
  71. GRB 100413A: Swift detection of a burst
  72. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  73. Swift-BAT trigger 419015 is not astrophysical
  74. Trigger 419015 is probably not a GRB
  75. GRB100401A: GROND Upper Limits
  76. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  77. MASTER observations on the Swift second trigger on LS V +44 17
  78. IBAS Alert n. 5996: not a GRB
  79. IBAS Alert n. 5995: not a GRB
  80. GRB 100331B: GROND Upper limits
  81. Master-Net observations on the Swift trigger on LS V +44 17
  82. GRB 100401A: Swift/UVOT Upper Limit
  83. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  84. GRB 100401A: Fermi GBM detection
  85. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  86. GRB 100331B: BOOTES-3 observations
  87. GRB 100316A: R-band limit
  88. GRB 100324B: Suzaku WAM observation of the prompt emission
  89. GRB 100331B: Swift/UVOT Upper Limits
  90. GRB 100331B: Swift/XRT possible afterglow candidate
  91. Swift detection of LS V +44 17
  92. GRB 100331B: SuperAGILE Localization of a Long GRB
  93. INTEGRAL trigger 5994 (GRB100331A): Swift/XRT observations
  94. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  95. GRB 100331A: BOOTES-3 observations
  96. Konus-Wind observation of GRB 100324B
  97. GRB 100331A: A long GRB detected by INTEGRAL
  98. IPN triangulation of GRB100324B
  99. Konus-Wind observation of GRB 100322A
  100. Short X-ray Transient detected by MAXI/GSC

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