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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

26310 results found.

  1. GRB 100425A: candidate optical afterglow from the VLT
  2. GRB 100424A: GROND Upper Limits
  3. GRB 100425A: Swift detection of a burst
  4. GRB 100424A: NOT optical observations
  5. GRB 100424A, Swift-BAT refined analysis
  6. GRB 100424A: Enhanced Swift-XRT position
  7. GRB 100424A: Prompt enhanced Swift-XRT position.
  8. GRB 100424A: Swift detection of a burst
  9. GRB 100420A: GRT Optical Observation
  10. GRB 100418A: ROVOR optical measurements at 35 hours
  11. GRB 100420A: Swift-BAT refined analysis
  12. GRB 100423B: Fermi GBM detection
  13. GRB 100423A: Swift-BAT refined analysis
  14. Trigger 420256: Swift detection of a possible GRB
  15. GRB 100423A: GROND discovery of afterglow
  16. GRB 100423A: Swift detection of a burst
  17. Radio afterglow detection of GRB 100418A with the EVLA
  18. GRB 100414A: Radio Afterglow Detection with the Expanded VLA
  19. GRB100418A: REM possible afterglow detection
  20. GRB 100418A: Continuing Swift/UVOT Observations
  21. GRB 100418A: RTT150 optical observations
  22. GRB 100414A: CFHT optical observations
  23. GRB 100420A: XRT refined analysis
  24. GRB 100420A: Enhanced Swift-XRT position
  25. GRB 100420A: SARA Upper Limits
  26. GRB 100418A: RTT150 observations during the optical afterglow maximum
  27. GRB 100414A: Confirmation of the X-ray afterglow
  28. GRB 100418A: VLT optical observations
  29. GRB 100420A: Swift detection of a burst
  30. GRB 100418A PAIRITEL NIR Observations
  31. GRB 100418A: ROVOR optical afterglow detection
  32. GRB 100418A: Swift/UVOT Observations
  33. GRB 100413A: GMRT observation of radio afterglow
  34. GRB 100418A: Swift-XRT Refined Analysis
  35. GRB100418A: VLT/X-shooter redshift and photometry
  36. GRB 100418A: GROND observations; missing author list added
  37. GRB 100418A: GROND observations
  38. GRB 100418A: Swift-BAT refined analysis
  39. GRB 100418A: Enhanced Swift-XRT position
  40. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  41. GRB 100413A: Radio Afterglow Detection with the EVLA
  42. GRB 100414A: Suzaku WAM observation of the prompt emission
  43. GRB 100414A: Swift/UVOT Observations
  44. GRB 100414A: GROND Detection of the Optical Afterglow
  45. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  46. GRB 100413A: Suzaku WAM observation of the prompt emission
  47. GRB 100414A: Palomar Transient Factory Observations
  48. GRB 100413B: Swift Confirmation of Burst
  49. GRB 100413A: Swift-BAT final refined analysis
  50. GRB 100414A: IPN Localization
  51. Konus-Wind observation of GRB 100414B
  52. GRB 100414A: Fermi GBM detection
  53. GRB100414A: Fermi LAT detection
  54. GRB 100413B : Swift detection of a burst
  55. GRB 100413A: GROND Upper limits
  56. Konus-Wind observation of GRB 100413A
  57. GRB 100413A: Swift-XRT Refined Analysis
  58. GRB 100413A: Swift-BAT initial refined analysis
  59. GRB 100413A: Enhanced Swift-XRT position
  60. GRB 100413A: Swift detection of a burst
  61. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  62. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  63. GRB 100331B: GROND Upper limits
  64. GRB 100401A: Swift/UVOT Upper Limit
  65. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  66. GRB 100401A: Fermi GBM detection
  67. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  68. GRB 100316A: R-band limit
  69. GRB 100324B: Suzaku WAM observation of the prompt emission
  70. GRB 100331B: Swift/UVOT Upper Limits
  71. Swift detection of LS V +44 17
  72. GRB 100331B: SuperAGILE Localization of a Long GRB
  73. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  74. Konus-Wind observation of GRB 100324B
  75. GRB 100331A: A long GRB detected by INTEGRAL
  76. IPN triangulation of GRB100324B
  77. Konus-Wind observation of GRB 100322A
  78. Short X-ray Transient detected by MAXI/GSC
  79. GRB 100322A: Suzaku WAM observation of the prompt emission
  80. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  81. GRB 100325A: Fermi LAT detection
  82. GROND observations of GRB100316D/SN2010bh
  83. GRB 100325A: Fermi GBM detection
  84. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  85. GRB 100316D: Spectroscopic Discovery of a Supernova from Magellan
  86. GRB 100322A: Fermi GBM detection
  87. SGR 1833-0832: Archival Chandra Observations
  88. Possible pulsation period in SGR 1833-0832
  89. Probable SGR 1833-0832: Swift-XRT refined analysis
  90. Probable SGR 1833-0832: Enhanced Swift-XRT position
  91. Swift-XRT refined position of the probable new SGR 1833-0832
  92. Swift-BAT refined analysis of the probable new SGR 1833-0832
  93. GRB 100319A: Swift detection of a burst; possible SGR
  94. GRB 100316D: Possible Supernova
  95. GRB 100316D: Pre-burst emission measured by BAT
  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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