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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"

41975 results found.

  1. GRB 060908: REM optical prompt observation
  2. GRB 060908: PROMPT Detection of a Bright Counterpart
  3. GRB 060908: Swift detection of a burst with a bright optical counterpart
  4. GRB 060904A: Suzaku/WAM observation of the prompt emission
  5. GRB060906 , optical observation
  6. GRB060904b optical detections (delayed report due to internet outage)
  7. GRB 060906: optical observation
  8. GRB 060906: Swift/XRT Refined Analysis
  9. GRB 060906: Swift-UVOT observations
  10. VLT redshift of GRB 060906
  11. GRB 060906, Swift-BAT refined analysis
  12. GRB 060906: FRAM observations - flash determination (airplane)
  13. GRB 060906: KAIT observations
  14. GRB 060906: Confirmation of P60 Optical Afterglow
  15. GRB 060906: observations with FRAM
  16. GRB 060906 (?): P60 Optical Afterglow Candidate
  17. GRB 060906: Swift detection of a probable burst
  18. GRB 060904A Milagro GeV/TeV Observations
  19. GRB060904b, optical observations
  20. GRB 060904b: SMARTS optical/IR afterglow observations
  21. GRB 060904B: RTT150 optical observations
  22. GRB060904A: Swift/UVOT optical observations
  23. GRB 060904A: Subaru NIR observation
  24. GRB 060904B: Swift-BAT refined analysis
  25. GRB060904b: Optical observations with Swift/UVOT
  26. GRB 060904B: Swift-XRT refined analysis
  27. GRB 060904A: Refined analysis of the Swift-BAT burst
  28. GRB 060904A: Swift-XRT refined analysis
  29. GRB 060904A: Suzaku-XIS and -HXD observation plan
  30. GRB 060904B: VLT redshift
  31. GRB 060904A: P60 Observations
  32. GRB 060904B: Optical observations at Crni Vrh
  33. GRB060904B: Watcher observations
  34. GRB 060904B BOOTES-IR and 1.5m OSN observations
  35. GRB 060904B: TAROT optical counterpart observations
  36. GRB060904B - SDSS Pre-Burst Observations
  37. GRB 060904: TAROT optical observations
  38. GRB 060904B: Swift detection of a burst with optical counterpart
  39. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  40. GRB060904 - SDSS Pre-Burst Observations
  41. GRB 060904: Swift detection of a bright burst
  42. GRB060901: Optical observations
  43. 060901: Swift UVOT followup observations
  44. Konus-Wind observation of GRB 060901
  45. GRB 060901: SMARTS optical/IR observations update
  46. GRB 060901: Swift/XRT Refined Analysis
  47. GRB 060901: SMARTS optical/IR observations
  48. GRB 060901: Swift/XRT Position
  49. GRB 060901: Watcher observations
  50. GRB 060901: a long GRB detected by INTEGRAL
  51. Two bright bursts from SGR 1806-20 detected with IBAS
  52. GRB 060605, observations using an Integral Field Unit
  53. GRB 060604: VLA Observation
  54. GRB 060814: Suzaku/WAM observation of the prompt emission
  55. GRB 060605: VLA Observation
  56. GRB 060707: VLA observation
  57. GRB 060825: VLA observations
  58. GRB060826 - SDSS Pre-Burst Observations
  59. GRB 060826(?): Swift detection of a possible burst
  60. GRB 060825: XRT Team Refined Analysis
  61. GRB 060825: Swift-BAT Refined Analysis
  62. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  63. GRB060825: Liverpool Telescope optical observations
  64. GRB 060825: TNG optical observations
  65. GRB 060825: TAROT optical observations
  66. GRB 060825: P60 Observations
  67. GRB060825: BOOTES-IR optical observations
  68. GRB 060825: Swift detection of a burst
  69. GRB060801: host galaxy redshift
  70. GRB060729: analysis of XMM-Newton observation
  71. Radio observations of GRB 060719
  72. GRB 060729, SMARTS optical/IR observations
  73. GRB 060813: A long, bright GRB detected with Suzaku WAM
  74. GRB 060814: Confirmation of IR afterglow
  75. Konus-Wind observation of GRB 060814
  76. GRB 060814: P60 Observations
  77. GRB 060814: P200 NIR Observations
  78. GRB 060814: Possible IR counterpart
  79. GRB060805B: optical observations
  80. GRB 060814: Swift XRT refined analysis
  81. GRB 060814: VLT optical limits
  82. GRB 060814 - SDSS Pre-Burst Observations
  83. GRB 060814: TAROT optical observations
  84. GRB 060814: Swift detection of a bright burst
  85. Konus-Wind observation of GRB 060813
  86. GRB 060813: Swift XRT refined analysis
  87. GRB 060813: Refined analysis of the Swift-BAT burst
  88. GRB 060813: Swift detection of a burst
  89. GRB051109B: Late-time Radio Observations
  90. Second VLA limit on new radio point source in SGR 1806-20
  91. A dust-scattering halo detected around SGR 1806-20
  92. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  93. GRB060807: Possible Highly Significant X-ray Emission Lines
  94. GRB060714: optical observations
  95. GRB 060729: An update on the Swift XRT and UVOT observations
  96. GRB060717: optical observations
  97. GRB060807: Optical limiting magnitudes
  98. GRB 060805B: optical observation at Sierra Nevada
  99. GRB 060805B: XRT Team Analysis
  100. GRB060806 is similar to previous activity of SGR1806-20

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