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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"

11503 results found.

  1. GRB 100526A: Swift XRT refined analysis
  2. GRB 100526B: Swift XRT/UVOT observations
  3. GRB 100526A: Swift-BAT refined analysis
  4. GRB 100526A: Swift detection of a burst
  5. Konus-Wind observation of GRB 100522A
  6. GRB 100522A: Swift XRT refined analysis
  7. GRB 100522A: NIR observations from CAHA
  8. GRB 100522A: Swift detection of a burst
  9. GRB 100518A: Swift-XRT refined analysis
  10. Update to the configuration of the Fermi-LAT onboard GRB search
  11. GRB 100518A: Faulkes Telescope North Afterglow Candidate
  12. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  13. GRB 100518A: a long GRB detected with INTEGRAL
  14. Swift Trigger 422437 is probably not a GRB
  15. GRB 100513A: EVLA radio observation
  16. GRB 100514A: Swift XRT refined analysis
  17. GRB 100514A: MASTER-Net optical observations
  18. GRB 100514A: Swift detection of a burst
  19. GRB 100513A: Swift XRT refined analysis
  20. GRB 100513A: Swift detection of a burst
  21. GRB 100511A, RIMOTS optical upper limits
  22. GRB 100508A: Swift-XRT Refined analysis
  23. GRB 100508A: Swift-BAT refined analysis
  24. GRB 100508A: ROTSE-III Optical Limits
  25. GRB 100508A: Swift detection of a burst
  26. GRB 100504A: Fermi GBM observation
  27. GRB 100504A: GROND Upper limits
  28. GRB 100504A: SARA-South Upper Limit
  29. GRB 100504A: Swift detection of a burst
  30. INTEGRAL observations of Swift GRB trigger 421072
  31. GRB 100420A: Gemini discovery of infrared afterglow
  32. GRB 100420A: Terskol optical upper limit
  33. GRB 100418A: RTT150 optical observations
  34. Konus-Wind observation of GRB 100423A
  35. GRB 100418A: Terskol optical observations
  36. GRB 100425A: Swift XRT refined analysis
  37. GRB 100424A: Liverpool Telescope Upper Limits
  38. GRB 100425A: GROND afterglow observation
  39. GRB 100424A: D50 optical limits
  40. GRB 100424A: GROND Upper Limits
  41. GRB 100424A: Swift-XRT refined analysis
  42. GRB 100425A: Swift detection of a burst
  43. GRB 100424A, Swift-BAT refined analysis
  44. GRB 100420A: GRT Optical Observation
  45. GRB 100418A: ROVOR optical measurements at 35 hours
  46. Swift Trigger 420256: ROTSE-III Optical Limits
  47. Radio afterglow detection of GRB 100418A with the EVLA
  48. GRB 100418A: Continued PAIRITEL NIR Observations
  49. GRB 100418A: WSRT Radio Detection
  50. GRB 100418A: RTT150 optical observations
  51. GRB100420A: MITSuME optical upper limits
  52. GRB 100414A: CFHT optical observations
  53. GRB 100420A: SARA Upper Limits
  54. GRB 100418A: RTT150 observations during the optical afterglow maximum
  55. GRB 100418A: SMA submm detection
  56. GRB 100420A: ROTSE-III Optical Limits
  57. GRB 100418A: Swift-XRT Refined Analysis
  58. GRB100414A: SAO RAS optical observations
  59. GRB 100418A: ROTSE-III Optical Limits
  60. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  61. GRB 100414A: Suzaku WAM observation of the prompt emission
  62. Konus-Wind observation of GRB 100414B
  63. GRB 100415A: MAXI/GSC detection of a probable GRB
  64. GRB 100414A: Fermi GBM detection
  65. GRB100414A: Fermi LAT detection
  66. Konus-Wind observation of GRB 100413A
  67. Tentative redshift of GRB100413A from X-ray data
  68. GRB 100413A: Swift-XRT Refined Analysis
  69. GRB 100413: xinglong TNT optical upper limit
  70. GRB 100413A: MASTER-Net optical observations
  71. GRB 100413A: Swift detection of a burst
  72. GRB100401A: GROND Upper Limits
  73. MASTER observations on the Swift second trigger on LS V +44 17
  74. GRB 100331B: Swift/XRT possible afterglow candidate
  75. GRB 100331B: SuperAGILE Localization of a Long GRB
  76. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  77. Konus-Wind observation of GRB 100324B
  78. GRB 100331A: A long GRB detected by INTEGRAL
  79. Konus-Wind observation of GRB 100322A
  80. Short X-ray Transient detected by MAXI/GSC
  81. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  82. GRB 100325A: Fermi LAT detection
  83. GRB 100324A: GROND observations
  84. SGR 1833-0832: Archival Chandra Observations
  85. Discovery of the Spin Period of SGR 1833-0832
  86. GRB 100319A: correction to GCN 10527
  87. GRB 100219A: MASTER-Net optical alert observations
  88. GRB 100316D: Further Gemini observations
  89. GRB 100316B: Swift-XRT refined analysis
  90. Tentative redshift of GRB100316D from X-ray data
  91. GRB 100316C: Swift-XRT team refined analysis
  92. GRB 100316D: Swift XRT refined analysis
  93. GRB 100316A: Swift-XRT refined analysis
  94. GRB 100316A: Swift-BAT refined analysis
  95. GRB 100316B: Swift-BAT refined analysis
  96. GRB 100316C: BOOTES-3 observations
  97. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  98. GRB 100316C: Swift detection of a burst
  99. GRB 100316B: Swift detection of a burst with optical counterpart
  100. GRB 100305A: Super-LOTIS early observations

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