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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"

20366 results found.

  1. GRB 100414A: CFHT optical observations
  2. GRB 100420A: Swift/UVOT Upper Limits
  3. GRB 100420A: XRT refined analysis
  4. GRB 100420A: Enhanced Swift-XRT position
  5. GRB 100418A: SARA second epoch
  6. GRB 100420A: SARA Upper Limits
  7. GRB 100418A: optical observations
  8. GRB 100418A: SMA submm detection
  9. GRB 100420A: Swift detection of a burst
  10. GRB 100418A: Swift/UVOT Observations
  11. GRB 100418A: Gemini-N redshift confirmation
  12. GRB100418A: VLT/X-shooter redshift and photometry
  13. GRB 100418A: SARA observations
  14. GRB 100418A: GROND observations; missing author list added
  15. GRB 100418A: GROND observations
  16. GRB 100418A: Enhanced Swift-XRT position
  17. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  18. GRB 100414A: Swift/UVOT Observations
  19. GRB 100414A: GROND Detection of the Optical Afterglow
  20. GRB 100414A: Gemini-N candidate and redshift
  21. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  22. GRB 100414A: Palomar Transient Factory Observations
  23. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  24. Konus-Wind observation of GRB 100414B
  25. GRB 100415A: MAXI/GSC detection of a probable GRB
  26. GRB 100414A: Fermi GBM detection
  27. GRB100414A: Fermi LAT detection
  28. GRB 100413A: GROND Upper limits
  29. GRB 100413A: Swift/UVOT Upper Limits
  30. Tentative redshift of GRB100413A from X-ray data
  31. GRB 100413A: SARA upper limit
  32. GRB 100413A: Enhanced Swift-XRT position
  33. GRB 100413A: Swift detection of a burst
  34. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  35. Trigger 419015 is probably not a GRB
  36. GRB100401A: GROND Upper Limits
  37. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  38. GRB 100331B: GROND Upper limits
  39. GRB 100401A: Fermi GBM detection
  40. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  41. GRB 100331B: BOOTES-3 observations
  42. GRB 100331B: Swift/UVOT Upper Limits
  43. GRB 100331B: Swift/XRT possible afterglow candidate
  44. Swift detection of LS V +44 17
  45. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  46. GRB 100331A: BOOTES-3 observations
  47. GRB 100331A: A long GRB detected by INTEGRAL
  48. Short X-ray Transient detected by MAXI/GSC
  49. GRB 100325A: Fermi LAT detection
  50. GROND observations of GRB100316D/SN2010bh
  51. GRB 100324A: GROND observations
  52. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  53. SGR 1833-0832: Swift/UVOT Upper Limits
  54. SGR 1833-0832: Archival Chandra Observations
  55. Possible pulsation period in SGR 1833-0832
  56. Discovery of the Spin Period of SGR 1833-0832
  57. GRB 100316D: ATCA radio observations
  58. Probable SGR 1833-0832: Enhanced Swift-XRT position
  59. GRB 100219A: MASTER-Net optical alert observations
  60. GRB 100319A: Swift detection of a burst; possible SGR
  61. GRB 100316D: Possible Supernova
  62. GRB 100219A: optical upper limit
  63. GRB 100316A: optical observations in CrAO
  64. GRB 100316D: Swift/UVOT Observations
  65. GRB 100316D: Swift XRT enhanced position and further refined analysis
  66. GRB 100316B: Swift-XRT refined analysis
  67. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  68. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  69. GRB 100316D: Gemini/GMOS and VLT/X-shooter observations
  70. GRB 100316D: VLT/X-shooter observations
  71. GRB100316C: Swift/UVOT Upper Limits
  72. GRB 100316B: Swift/UVOT observations
  73. GRB 100316C: Enhanced Swift-XRT position
  74. GRB 100316A: TAROT Calern observatory optical observations
  75. GRB 100316B: Enhanced Swift-XRT position
  76. GRB100316A: Swift/UVOT Upper Limits
  77. Trigger 416140 is almost certainly not a GRB
  78. GRB 100316C: BOOTES-3 observations
  79. GRB 100316D: Swift detection of a burst
  80. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  81. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  82. GRB 100316C: Swift detection of a burst
  83. GRB 100316A: Enhanced Swift-XRT position
  84. GRB 100316B: Swift detection of a burst with optical counterpart
  85. GRB100305A: Optical upper limits at IAO
  86. GRB 100305A: Super-LOTIS early observations
  87. GRB100302A : LOAO observations and Lulin afterglow analysis
  88. GRB 100305A: Swift/UVOT Upper Limits
  89. GRB 100305A Optical Observations
  90. GRB 100305A: Enhanced Swift-XRT position
  91. GRB 100305A: Gemini-N OT candidate
  92. GRB 100305A: PAIRITEL NIR Upper Limits
  93. GRB 100305A: P60 Observations
  94. GRB 100305A: Swift detection of a burst
  95. GRB 100302A: Swift/UVOT Upper Limits
  96. GRB 100302A: Gemini-N OT confirmation
  97. GRB 100302A: Optical observations at Crni Vrh
  98. GRB 100302A: MASTER-Net optical alert observations
  99. GRB 1000302A : A possible afterglow candidate
  100. GRB 100302A: Enhanced Swift-XRT position

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