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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"

12113 results found.

  1. GRB 100514A: Swift detection of a burst
  2. GRB 100513A: Swift XRT refined analysis
  3. GRB 100513A: Swift detection of a burst
  4. Swift-BAT trigger 421695 is likely not astrophysical
  5. GRB 100511A, RIMOTS optical upper limits
  6. GRB 100508A: Swift-XRT Refined analysis
  7. GRB 100508A: Swift-BAT refined analysis
  8. GRB 100508A: ROTSE-III Optical Limits
  9. GRB 100508A: Swift detection of a burst
  10. Swift-BAT refined analysis of trigger 421262
  11. GRB 100504A: Fermi GBM observation
  12. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  13. GRB 100504A: GROND Upper limits
  14. GRB 100504A: SARA-South Upper Limit
  15. GRB 100504A: Swift detection of a burst
  16. INTEGRAL observations of Swift GRB trigger 421072
  17. GRB 100420A: Gemini discovery of infrared afterglow
  18. GRB 100420A: Terskol optical upper limit
  19. GRB 100418A: RTT150 optical observations
  20. Konus-Wind observation of GRB 100423A
  21. GRB 100418A: Terskol optical observations
  22. GRB 100425A: Swift XRT refined analysis
  23. GRB 100424A: Liverpool Telescope Upper Limits
  24. GRB 100425A: GROND afterglow observation
  25. GRB 100424A: D50 optical limits
  26. GRB 100424A: GROND Upper Limits
  27. GRB 100424A: Swift-XRT refined analysis
  28. GRB 100425A: Swift detection of a burst
  29. GRB 100424A, Swift-BAT refined analysis
  30. GRB 100420A: GRT Optical Observation
  31. GRB 100418A: ROVOR optical measurements at 35 hours
  32. Swift Trigger 420256: ROTSE-III Optical Limits
  33. Radio afterglow detection of GRB 100418A with the EVLA
  34. GRB 100418A: Continued PAIRITEL NIR Observations
  35. GRB 100418A: WSRT Radio Detection
  36. GRB 100418A: RTT150 optical observations
  37. GRB100420A: MITSuME optical upper limits
  38. GRB 100414A: CFHT optical observations
  39. GRB 100420A: SARA Upper Limits
  40. GRB 100418A: RTT150 observations during the optical afterglow maximum
  41. GRB 100418A: SMA submm detection
  42. GRB 100420A: ROTSE-III Optical Limits
  43. GRB 100418A: Swift-XRT Refined Analysis
  44. GRB100414A: SAO RAS optical observations
  45. GRB 100418A: ROTSE-III Optical Limits
  46. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  47. GRB 100414A: Suzaku WAM observation of the prompt emission
  48. Konus-Wind observation of GRB 100414B
  49. GRB 100415A: MAXI/GSC detection of a probable GRB
  50. GRB 100414A: Fermi GBM detection
  51. GRB100414A: Fermi LAT detection
  52. Konus-Wind observation of GRB 100413A
  53. Tentative redshift of GRB100413A from X-ray data
  54. GRB 100413A: Swift-XRT Refined Analysis
  55. GRB 100413: xinglong TNT optical upper limit
  56. GRB 100413A: MASTER-Net optical observations
  57. GRB 100413A: Swift detection of a burst
  58. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  59. GRB100401A: GROND Upper Limits
  60. MASTER observations on the Swift second trigger on LS V +44 17
  61. GRB 100331B: Swift/XRT possible afterglow candidate
  62. GRB 100331B: SuperAGILE Localization of a Long GRB
  63. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  64. Konus-Wind observation of GRB 100324B
  65. GRB 100331A: A long GRB detected by INTEGRAL
  66. Konus-Wind observation of GRB 100322A
  67. Short X-ray Transient detected by MAXI/GSC
  68. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  69. GRB 100325A: Fermi LAT detection
  70. GRB 100324A: GROND observations
  71. SGR 1833-0832: Swift/UVOT Upper Limits
  72. SGR 1833-0832: Archival Chandra Observations
  73. SGR 1833-0832 is pulsed at 7.56 seconds
  74. SGR 1833-0832 is pulsed at 7.56 seconds
  75. Possible pulsation period in SGR 1833-0832
  76. Discovery of the Spin Period of SGR 1833-0832
  77. GRB 100319A: correction to GCN 10527
  78. Probable SGR 1833-0832: Swift-XRT refined analysis
  79. Probable SGR 1833-0832: Enhanced Swift-XRT position
  80. Swift-XRT refined position of the probable new SGR 1833-0832
  81. Swift-BAT refined analysis of the probable new SGR 1833-0832
  82. GRB 100219A: MASTER-Net optical alert observations
  83. GRB 100319A: Swift detection of a burst; possible SGR
  84. GRB 100316D: Further Gemini observations
  85. GRB 100316B: Swift-XRT refined analysis
  86. Tentative redshift of GRB100316D from X-ray data
  87. GRB 100316C: Swift-XRT team refined analysis
  88. GRB 100316D: Swift XRT refined analysis
  89. GRB 100316A: Swift-XRT refined analysis
  90. GRB 100316A: Swift-BAT refined analysis
  91. GRB 100316B: Swift-BAT refined analysis
  92. GRB 100316C: BOOTES-3 observations
  93. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  94. GRB 100316C: Swift detection of a burst
  95. GRB 100316B: Swift detection of a burst with optical counterpart
  96. GRB 100305A: Super-LOTIS early observations
  97. GRB 100305A: Swift-XRT refined analysis
  98. GRB 100305A Optical Observations
  99. GRB 100305A: Swift detection of a burst
  100. GRB 100302A: Swift-XRT refined analysis

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