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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"

42847 results found.

  1. GRB 060906: Swift-UVOT observations
  2. VLT redshift of GRB 060906
  3. GRB 060906, Swift-BAT refined analysis
  4. GRB 060906: FRAM observations - flash determination (airplane)
  5. GRB 060906: KAIT observations
  6. GRB 060906: Confirmation of P60 Optical Afterglow
  7. GRB 060906: observations with FRAM
  8. GRB 060906 (?): P60 Optical Afterglow Candidate
  9. GRB 060906: Swift detection of a probable burst
  10. GRB 060904A Milagro GeV/TeV Observations
  11. GRB060904b, optical observations
  12. GRB 060904b: SMARTS optical/IR afterglow observations
  13. GRB 060904B: RTT150 optical observations
  14. GRB 060904A: Subaru NIR observation
  15. GRB 060904B: Swift-BAT refined analysis
  16. GRB060904b: Optical observations with Swift/UVOT
  17. Konus-Wind observation of GRB 060904A
  18. GRB 060904B: Swift-XRT refined analysis
  19. GRB 060904A: Refined analysis of the Swift-BAT burst
  20. GRB 060904A: Swift-XRT refined analysis
  21. GRB 060904A: Suzaku-XIS and -HXD observation plan
  22. GRB 060904A: P60 Observations
  23. GRB 060904B: Optical observations at Crni Vrh
  24. GRB060904B: Watcher observations
  25. GRB 060904B BOOTES-IR and 1.5m OSN observations
  26. GRB 060904B: TAROT optical counterpart observations
  27. GRB060904B - SDSS Pre-Burst Observations
  28. GRB 060904: TAROT optical observations
  29. GRB 060904B: Swift detection of a burst with optical counterpart
  30. GRB060904 - SDSS Pre-Burst Observations
  31. GRB 060904: Swift detection of a bright burst
  32. GRB060901: Optical observations
  33. 060901: Swift UVOT followup observations
  34. Konus-Wind observation of GRB 060901
  35. GRB 060901: SMARTS optical/IR observations update
  36. GRB 060901: Swift/XRT Refined Analysis
  37. GRB 060901: SMARTS optical/IR observations
  38. GRB 060901: Swift/XRT Position
  39. GRB 060901: further INTEGRAL results
  40. GRB 060901: Watcher observations
  41. GRB 060901: a long GRB detected by INTEGRAL
  42. Two bright bursts from SGR 1806-20 detected with IBAS
  43. GRB 060605, observations using an Integral Field Unit
  44. GRB 060604: VLA Observation
  45. GRB 060814: Suzaku/WAM observation of the prompt emission
  46. GRB 060605: VLA Observation
  47. GRB 060707: VLA observation
  48. GRB 060825: VLA observations
  49. GRB060826 - SDSS Pre-Burst Observations
  50. GRB 060826(?): Swift detection of a possible burst
  51. GRB 060825: XRT Team Refined Analysis
  52. GRB 060825: Swift-BAT Refined Analysis
  53. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  54. GRB 060825: TNG optical observations
  55. GRB 060825: TAROT optical observations
  56. GRB 060825: P60 Observations
  57. GRB060825: BOOTES-IR optical observations
  58. GRB 060825: Swift detection of a burst
  59. GRB060801: host galaxy redshift
  60. GRB060729: analysis of XMM-Newton observation
  61. GRB 060814: pseudo-z from spectral parameters of the prompt
  62. IBAS Alerts No 3429 and 3430: not GRBs
  63. Radio observations of GRB 060719
  64. GRB 060729, SMARTS optical/IR observations
  65. GRB060814: Break in the XRT light curve
  66. GRB 060813: A long, bright GRB detected with Suzaku WAM
  67. GRB 060814: Confirmation of IR afterglow
  68. Konus-Wind observation of GRB 060814
  69. GRB 060814: Refined analysis of the Swift-BAT burst
  70. GRB 060814: P60 Observations
  71. GRB 060814: P200 NIR Observations
  72. GRB 060814: source inside revised XRT error box
  73. GRB060814: Swift/UVOT upper limits
  74. GRB 060814: Swift XRT refined analysis
  75. GRB 060814: VLT optical limits
  76. GRB 060814 - SDSS Pre-Burst Observations
  77. GRB 060814: TAROT optical observations
  78. GRB 060814: Swift detection of a bright burst
  79. Konus-Wind observation of GRB 060813
  80. GRB060813: Swift/UVOT upper limits
  81. GRB 060813: Swift XRT refined analysis
  82. GRB 060813: Refined analysis of the Swift-BAT burst
  83. GRB 060813: Swift detection of a burst
  84. GRB051109B: Late-time Radio Observations
  85. Second VLA limit on new radio point source in SGR 1806-20
  86. A dust-scattering halo detected around SGR 1806-20
  87. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  88. GRB060807: Possible Highly Significant X-ray Emission Lines
  89. GRB060714: optical observations
  90. IBAS Alert n. 3422: not a GRB
  91. GRB 060729: An update on the Swift XRT and UVOT observations
  92. GRB060807: Optical limiting magnitudes
  93. GRB 060805B: optical observation at Sierra Nevada
  94. GRB 060805B: XRT Team Analysis
  95. VLA Upper Limit on Outburst of SGR 1806-20
  96. GRB060806 is similar to previous activity of SGR1806-20
  97. GRB 060807: UVOT Upper limits
  98. GRB 060807: afterglow confirmation
  99. GRB 060807: K- and R-band observations
  100. GRB 060807: Refined analysis of the Swift-BAT burst

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