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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"

19588 results found.

  1. GRB 060906, Swift-BAT refined spectral analysis
  2. GRB 060906: Confirmation of P60 Optical Afterglow
  3. GRB 060906 (?): P60 Optical Afterglow Candidate
  4. GRB 060906: Swift detection of a probable burst
  5. GRB060904b, optical observations
  6. GRB 060904B: RTT150 optical observations
  7. GRB060904A: Swift/UVOT optical observations
  8. GRB 060904A: Subaru NIR observation
  9. GRB 060904A: Refined analysis of the Swift-BAT burst
  10. GRB 060904A: Suzaku-XIS and -HXD observation plan
  11. GRB 060904A: P60 Observations
  12. GRB 060904B: TAROT optical counterpart observations
  13. GRB060904B - SDSS Pre-Burst Observations
  14. GRB 060904: TAROT optical observations
  15. GRB 060904B: Swift detection of a burst with optical counterpart
  16. GRB060904 - SDSS Pre-Burst Observations
  17. GRB 060904: Swift detection of a bright burst
  18. GRB060901: Optical observations
  19. 060901: Swift UVOT followup observations
  20. Konus-Wind observation of GRB 060901
  21. GRB 060605, observations using an Integral Field Unit
  22. GRB 060604: VLA Observation
  23. GRB 060605: VLA Observation
  24. GRB 060707: VLA observation
  25. GRB 060825: VLA observations
  26. GRB060826 - SDSS Pre-Burst Observations
  27. GRB 060826(?): Swift detection of a possible burst
  28. GRB 060825: TNG optical observations
  29. GRB 060825: TAROT optical observations
  30. GRB 060825: P60 Observations
  31. GRB 060825: Swift detection of a burst
  32. GRB060801: host galaxy redshift
  33. GRB 060729, SMARTS optical/IR observations
  34. GRB 060814: P60 Observations
  35. GRB 060814: P200 NIR Observations
  36. GRB 060814: VLT optical limits
  37. GRB 060814 - SDSS Pre-Burst Observations
  38. GRB 060814: TAROT optical observations
  39. GRB 060814: Swift detection of a bright burst
  40. GRB 060813: Swift detection of a burst
  41. GRB051109B: Late-time Radio Observations
  42. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  43. GRB 060729: An update on the Swift XRT and UVOT observations
  44. GRB060717: optical observations
  45. GRB 060805B: XRT Team Analysis
  46. VLA Upper Limit on Outburst of SGR 1806-20
  47. GRB060807: optical afterglow candidate
  48. IPN triangulation of GRB060806 (long, exceptionally bright)
  49. GRB060807 - SDSS Pre-burst Observations
  50. GRB 060805B: Swift/UVOT Upper Limits
  51. GRB 060807, optical observation
  52. GRB 060807: Kanazawa R-band observation
  53. GRB 060807: Swift detection of a burst
  54. IPN triangulation of GRB060805B
  55. GRB060805 Liverpool Telescope observations
  56. GRB 060805: Swift-BAT Refined Analysis
  57. GRB 060805: Swift/UVOT Upper Limits
  58. GRB 060805: P60 Observations
  59. GRB 060805 - SDSS Pre-Burst Observations
  60. GRB 060805: Swift detection of a burst
  61. GRB 060804: Swift UVOT observations
  62. GRB 060728: Upper limits of the X-ray emission
  63. GRB 060801: no variability of optical sources
  64. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  65. GRB060801: Radio Observations
  66. GRB 051109B: Bright spiral host galaxy at low redshift
  67. GRB060801: Swift/UVOT Upper Limits
  68. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  69. GRB 060801, optical observation
  70. GRB 060801: Kanazawa Optical Observation
  71. GRB 060719: TORTOREM optical upper limits
  72. GRB 060729: Swift/UVOT Observations
  73. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  74. GRB 060728: Swift/UVOT Upper Limits
  75. GRB 060728, SMARTS optical/IR observations
  76. Swift/XRT preliminary analysis
  77. GRB 060728: Swift detection of a burst
  78. GRB 060714: Swift/UVOT Observations
  79. GRB060719: prompt NIR observations with REM
  80. GRB 060714: NOT observations
  81. GRB 060719: near-infrared afterglow
  82. GRB 060522: VLA observation
  83. GRB 060719: Swift/UVOT Upper Limits
  84. GRB 060719: VLT/ISAAC observations
  85. GRB060719: REM NIR Observations
  86. GRB 060719: VLT observations
  87. GRB 060719: LCO optical observations
  88. GRB 060719: Swift detection of a burst
  89. GRB 060717: Swift XRT refined analysis
  90. GRB060717: Swift/UVOT upper limits
  91. GRB 060717: Swift-BAT refined analysis
  92. GRB060717 - SDSS Pre-burst Observations
  93. GRB 060714: REM infrared observations
  94. GRB 060717, optical observation
  95. GRB 060717: Swift detection of a burst
  96. GRB 060714 : Liverpool Telescope Observations
  97. GRB 060708: VLT spectroscopy
  98. Swift trigger 219136 is probably not a GRB
  99. GRB 060714, optical observation
  100. GRB 060714: Swift detection of a burst with an UVOT optical afterglow

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