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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"

26684 results found.

  1. GRB 100413A: Swift/UVOT Upper Limits
  2. Konus-Wind observation of GRB 100413A
  3. GRB 100413A: Faulkes Telescope South observations
  4. Tentative redshift of GRB100413A from X-ray data
  5. GRB 100413A: SARA upper limit
  6. GRB 100413A: Swift-XRT Refined Analysis
  7. GRB 100413A: Enhanced Swift-XRT position
  8. GRB 100413A: Swift detection of a burst
  9. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  10. Trigger 419015 is probably not a GRB
  11. GRB100401A: GROND Upper Limits
  12. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  13. GRB 100331B: GROND Upper limits
  14. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  15. GRB 100401A: Fermi GBM detection
  16. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  17. GRB 100331B: BOOTES-3 observations
  18. GRB 100324B: Suzaku WAM observation of the prompt emission
  19. GRB 100331B: Swift/UVOT Upper Limits
  20. GRB 100331B: Swift/XRT possible afterglow candidate
  21. Swift detection of LS V +44 17
  22. GRB 100331B: SuperAGILE Localization of a Long GRB
  23. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  24. GRB 100331A: BOOTES-3 observations
  25. Konus-Wind observation of GRB 100324B
  26. GRB 100322A: Suzaku WAM observation of the prompt emission
  27. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  28. GRB 100325A: Fermi LAT detection
  29. GROND observations of GRB100316D/SN2010bh
  30. GRB 100325A: Fermi GBM detection
  31. GRB 100324A: GROND observations
  32. GRB 100324A found in ground analysis of BAT data
  33. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  34. SGR 1833-0832: Swift/UVOT Upper Limits
  35. GRB 100322A: Fermi GBM detection
  36. SGR 1833-0832: Archival Chandra Observations
  37. Possible pulsation period in SGR 1833-0832
  38. Discovery of the Spin Period of SGR 1833-0832
  39. GRB 100316D: ATCA radio observations
  40. Probable SGR 1833-0832: Swift-XRT refined analysis
  41. Probable SGR 1833-0832: Enhanced Swift-XRT position
  42. GRB 100219A: MASTER-Net optical alert observations
  43. GRB 100319A: Swift detection of a burst; possible SGR
  44. GRB 100316D: Possible Supernova
  45. GRB 100219A: optical upper limit
  46. GRB 100316A: optical observations in CrAO
  47. GRB 100316D: Swift/UVOT Observations
  48. GRB 100316D: Swift XRT enhanced position and further refined analysis
  49. GRB 100316B: Swift-XRT refined analysis
  50. Tentative redshift of GRB100316D from X-ray data
  51. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  52. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  53. GRB 100316D: Gemini/GMOS and VLT/X-shooter observations
  54. GRB 100316D: VLT/X-shooter observations
  55. GRB100316C: Swift/UVOT Upper Limits
  56. GRB 100316B: Swift/UVOT observations
  57. GRB 100316C: Swift-XRT team refined analysis
  58. GRB 100316C: Enhanced Swift-XRT position
  59. GRB 100316D: Swift XRT refined analysis
  60. GRB 100316A: TAROT Calern observatory optical observations
  61. GRB 100316A: Swift-XRT refined analysis
  62. GRB 100316B: Enhanced Swift-XRT position
  63. GRB 100316A: Swift-BAT refined analysis
  64. GRB100316A: Swift/UVOT Upper Limits
  65. Trigger 416140 is almost certainly not a GRB
  66. GRB 100316C: BOOTES-3 observations
  67. GRB 100316D: Swift detection of a burst
  68. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  69. GRB 100316C: Swift detection of a burst
  70. GRB 100316A: Enhanced Swift-XRT position
  71. GRB 100316B: Swift detection of a burst with optical counterpart
  72. GRB 100316A: Swift detection of a burst
  73. GRB100305A: Optical upper limits at IAO
  74. GRB 100305A: Super-LOTIS early observations
  75. GRB 100305A, Swift-BAT refined analysis
  76. GRB 100305A: Swift/UVOT Upper Limits
  77. GRB 100305A: Swift-XRT refined analysis
  78. GRB 100305A Optical Observations
  79. GRB 100305A: Enhanced Swift-XRT position
  80. GRB 100305A: Gemini-N OT candidate
  81. GRB 100305A: PAIRITEL NIR Upper Limits
  82. GRB 100305A: P60 Observations
  83. GRB 100305A: Swift detection of a burst
  84. GRB 100302A: Swift/UVOT Upper Limits
  85. GRB 100302A: Swift-XRT refined analysis
  86. GRB 100302A: Gemini-N OT confirmation
  87. GRB 100302A: Optical observations at Crni Vrh
  88. GRB 100302A: MASTER-Net optical alert observations
  89. GRB 1000302A : A possible afterglow candidate
  90. GRB 100302A: Enhanced Swift-XRT position
  91. GRB 100302A: Swift detection of a burst
  92. GRB 100224B: Fermi GBM detection
  93. GRB 100206A: optical observations in CrAO
  94. GRB 100206A: optical observations in Terskol
  95. GRB 100213B: Mondy optical observations
  96. GRB 100219A: optical observations
  97. GRB 100224A SHB found in ground analysis of BAT data
  98. GRB 100225A: Fermi LAT detection
  99. GRB 100225A: Fermi GBM detection
  100. GRB 100223A: Fermi GBM detection

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