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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"

20363 results found.

  1. GRB 100420A: Enhanced Swift-XRT position
  2. GRB 100418A: SARA second epoch
  3. GRB 100420A: SARA Upper Limits
  4. GRB 100418A: optical observations
  5. GRB 100418A: SMA submm detection
  6. GRB 100420A: Swift detection of a burst
  7. GRB 100418A: Swift/UVOT Observations
  8. GRB 100418A: Gemini-N redshift confirmation
  9. GRB100418A: VLT/X-shooter redshift and photometry
  10. GRB 100418A: SARA observations
  11. GRB 100418A: GROND observations; missing author list added
  12. GRB 100418A: GROND observations
  13. GRB 100418A: Enhanced Swift-XRT position
  14. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  15. GRB 100414A: Swift/UVOT Observations
  16. GRB 100414A: GROND Detection of the Optical Afterglow
  17. GRB 100414A: Gemini-N candidate and redshift
  18. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  19. GRB 100414A: Palomar Transient Factory Observations
  20. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  21. Konus-Wind observation of GRB 100414B
  22. GRB 100415A: MAXI/GSC detection of a probable GRB
  23. GRB 100414A: Fermi GBM detection
  24. GRB100414A: Fermi LAT detection
  25. GRB 100413A: GROND Upper limits
  26. GRB 100413A: Swift/UVOT Upper Limits
  27. Tentative redshift of GRB100413A from X-ray data
  28. GRB 100413A: SARA upper limit
  29. GRB 100413A: Enhanced Swift-XRT position
  30. GRB 100413A: Swift detection of a burst
  31. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  32. Trigger 419015 is probably not a GRB
  33. GRB100401A: GROND Upper Limits
  34. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  35. GRB 100331B: GROND Upper limits
  36. GRB 100401A: Fermi GBM detection
  37. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  38. GRB 100331B: BOOTES-3 observations
  39. GRB 100331B: Swift/UVOT Upper Limits
  40. GRB 100331B: Swift/XRT possible afterglow candidate
  41. Swift detection of LS V +44 17
  42. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  43. GRB 100331A: BOOTES-3 observations
  44. GRB 100331A: A long GRB detected by INTEGRAL
  45. Short X-ray Transient detected by MAXI/GSC
  46. GRB 100325A: Fermi LAT detection
  47. GROND observations of GRB100316D/SN2010bh
  48. GRB 100324A: GROND observations
  49. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  50. SGR 1833-0832: Swift/UVOT Upper Limits
  51. SGR 1833-0832: Archival Chandra Observations
  52. Possible pulsation period in SGR 1833-0832
  53. Discovery of the Spin Period of SGR 1833-0832
  54. GRB 100316D: ATCA radio observations
  55. Probable SGR 1833-0832: Enhanced Swift-XRT position
  56. GRB 100219A: MASTER-Net optical alert observations
  57. GRB 100319A: Swift detection of a burst; possible SGR
  58. GRB 100316D: Possible Supernova
  59. GRB 100219A: optical upper limit
  60. GRB 100316A: optical observations in CrAO
  61. GRB 100316D: Swift/UVOT Observations
  62. GRB 100316D: Swift XRT enhanced position and further refined analysis
  63. GRB 100316B: Swift-XRT refined analysis
  64. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  65. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  66. GRB 100316D: Gemini/GMOS and VLT/X-shooter observations
  67. GRB 100316D: VLT/X-shooter observations
  68. GRB100316C: Swift/UVOT Upper Limits
  69. GRB 100316B: Swift/UVOT observations
  70. GRB 100316C: Enhanced Swift-XRT position
  71. GRB 100316A: TAROT Calern observatory optical observations
  72. GRB 100316B: Enhanced Swift-XRT position
  73. GRB100316A: Swift/UVOT Upper Limits
  74. Trigger 416140 is almost certainly not a GRB
  75. GRB 100316C: BOOTES-3 observations
  76. GRB 100316D: Swift detection of a burst
  77. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  78. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  79. GRB 100316C: Swift detection of a burst
  80. GRB 100316A: Enhanced Swift-XRT position
  81. GRB 100316B: Swift detection of a burst with optical counterpart
  82. GRB100305A: Optical upper limits at IAO
  83. GRB 100305A: Super-LOTIS early observations
  84. GRB100302A : LOAO observations and Lulin afterglow analysis
  85. GRB 100305A: Swift/UVOT Upper Limits
  86. GRB 100305A Optical Observations
  87. GRB 100305A: Enhanced Swift-XRT position
  88. GRB 100305A: Gemini-N OT candidate
  89. GRB 100305A: PAIRITEL NIR Upper Limits
  90. GRB 100305A: P60 Observations
  91. GRB 100305A: Swift detection of a burst
  92. GRB 100302A: Swift/UVOT Upper Limits
  93. GRB 100302A: Gemini-N OT confirmation
  94. GRB 100302A: Optical observations at Crni Vrh
  95. GRB 100302A: MASTER-Net optical alert observations
  96. GRB 1000302A : A possible afterglow candidate
  97. GRB 100302A: Enhanced Swift-XRT position
  98. GRB 100302A: Swift detection of a burst
  99. GRB 100206A: optical observations in CrAO
  100. GRB 100206A: optical observations in Terskol

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