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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"

43003 results found.

  1. GRB 100420A: XRT refined analysis
  2. GRB 100420A: Enhanced Swift-XRT position
  3. GRB 100418A: SARA second epoch
  4. GRB 100420A: SARA Upper Limits
  5. GRB 100418A: RTT150 observations during the optical afterglow maximum
  6. GRB 100418A: MASTER-Net optical observations
  7. GRB 100414A: Confirmation of the X-ray afterglow
  8. GRB 100418A: VLT optical observations
  9. GRB 100420A: ROTSE-III Optical Limits
  10. GRB 100420A: Swift detection of a burst
  11. GRB 100418A PAIRITEL NIR Observations
  12. GRB 100418A: ROVOR optical afterglow detection
  13. GRB 100418A: Swift/UVOT Observations
  14. GRB 100418A: Gemini-N redshift confirmation
  15. GRB 100413A: GMRT observation of radio afterglow
  16. GRB 100418A: Swift-XRT Refined Analysis
  17. GRB 100418A: host galaxy detection in the SDSS
  18. GRB100418A: VLT/X-shooter redshift and photometry
  19. GRB 100418A: SARA observations
  20. GRB100414A: SAO RAS optical observations
  21. GRB 100418A: GROND observations; missing author list added
  22. GRB 100418A: GROND observations
  23. GRB 100418A: Swift-BAT refined analysis
  24. GRB 100418A: Enhanced Swift-XRT position
  25. GRB 100418A: ROTSE-III Optical Limits
  26. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  27. GRB 100413A: Radio Afterglow Detection with the EVLA
  28. GRB 100414A: Suzaku WAM observation of the prompt emission
  29. GRB 100414A: Swift/UVOT Observations
  30. GRB 100414A: Gemini-N observation (correction)
  31. GRB 100414A: GROND Detection of the Optical Afterglow
  32. GRB 100414A: Gemini-N candidate and redshift
  33. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  34. GRB 100413A: Suzaku WAM observation of the prompt emission
  35. GRB 100414A: Palomar Transient Factory Observations
  36. GRB 100413B: Swift Confirmation of Burst
  37. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  38. GRB 100413A: Swift-BAT final refined analysis
  39. GRB 100414A: IPN Localization
  40. Konus-Wind observation of GRB 100414B
  41. GRB 100415A: MAXI/GSC detection of a probable GRB
  42. GRB 100414A: Fermi GBM detection
  43. GRB100414A: Fermi LAT detection
  44. GRB 100413B : Swift detection of a burst
  45. GRB 100413A: GROND Upper limits
  46. GRB 100413A: Swift/UVOT Upper Limits
  47. Konus-Wind observation of GRB 100413A
  48. GRB 100413A: Faulkes Telescope South observations
  49. Tentative redshift of GRB100413A from X-ray data
  50. GRB 100413A: SARA upper limit
  51. GRB 100413A: Swift-XRT Refined Analysis
  52. GRB 100413A: Swift-BAT initial refined analysis
  53. GRB 100413A: Enhanced Swift-XRT position
  54. GRB 100413A: MASTER-Net optical observations
  55. GRB 100413A: Swift detection of a burst
  56. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  57. Swift-BAT trigger 419015 is not astrophysical
  58. Trigger 419015 is probably not a GRB
  59. GRB100401A: GROND Upper Limits
  60. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  61. MASTER observations on the Swift second trigger on LS V +44 17
  62. IBAS Alert n. 5996: not a GRB
  63. IBAS Alert n. 5995: not a GRB
  64. GRB 100331B: GROND Upper limits
  65. Master-Net observations on the Swift trigger on LS V +44 17
  66. GRB 100401A: Swift/UVOT Upper Limit
  67. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  68. GRB 100401A: Fermi GBM detection
  69. GRB 100316A: R-band limit
  70. GRB 100324B: Suzaku WAM observation of the prompt emission
  71. GRB 100331B: Swift/UVOT Upper Limits
  72. GRB 100331B: Swift/XRT possible afterglow candidate
  73. Swift detection of LS V +44 17
  74. GRB 100331B: SuperAGILE Localization of a Long GRB
  75. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  76. Konus-Wind observation of GRB 100324B
  77. GRB 100331A: A long GRB detected by INTEGRAL
  78. IPN triangulation of GRB100324B
  79. Konus-Wind observation of GRB 100322A
  80. Short X-ray Transient detected by MAXI/GSC
  81. Fermi GBM detection of four Solar Flares
  82. GRB 100322A: Suzaku WAM observation of the prompt emission
  83. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  84. GRB 100325A: Fermi LAT detection
  85. GROND observations of GRB100316D/SN2010bh
  86. GRB 100325A: Fermi GBM detection
  87. GRB 100324A: GROND observations
  88. GRB 100324A found in ground analysis of BAT data
  89. Emerging Supernova in the Afterglow of GRB 100316D
  90. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  91. GRB 100316D: Spectroscopic Discovery of a Supernova from Magellan
  92. SGR 1833-0832: Swift/UVOT Upper Limits
  93. GRB 100322A: Fermi GBM detection
  94. SGR 1833-0832 is pulsed at 7.56 seconds
  95. SGR 1833-0832 is pulsed at 7.56 seconds
  96. Possible pulsation period in SGR 1833-0832
  97. Discovery of the Spin Period of SGR 1833-0832
  98. GRB 100316D: ATCA radio observations
  99. Probable SGR 1833-0832: Swift-XRT refined analysis
  100. Probable SGR 1833-0832: Enhanced Swift-XRT position

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