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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"

20356 results found.

  1. GRB 060904B: TAROT optical counterpart observations
  2. GRB060904B - SDSS Pre-Burst Observations
  3. GRB 060904: TAROT optical observations
  4. GRB 060904B: Swift detection of a burst with optical counterpart
  5. GRB060904 - SDSS Pre-Burst Observations
  6. GRB 060904: Swift detection of a bright burst
  7. GRB060901: Optical observations
  8. 060901: Swift UVOT followup observations
  9. GRB 060901: Swift/XRT Refined Analysis
  10. GRB 060605, observations using an Integral Field Unit
  11. GRB 060604: VLA Observation
  12. GRB 060605: VLA Observation
  13. GRB 060707: VLA observation
  14. GRB 060825: VLA observations
  15. GRB060826 - SDSS Pre-Burst Observations
  16. GRB 060826(?): Swift detection of a possible burst
  17. GRB 060825: XRT Team Refined Analysis
  18. GRB 060825: Swift-BAT Refined Analysis
  19. GRB 060825: TNG optical observations
  20. GRB 060825: TAROT optical observations
  21. GRB 060825: P60 Observations
  22. GRB 060729, SMARTS optical/IR observations
  23. Konus-Wind observation of GRB 060814
  24. GRB 060814: P60 Observations
  25. GRB 060814: P200 NIR Observations
  26. GRB 060814: Swift XRT refined analysis
  27. GRB 060814: VLT optical limits
  28. GRB 060814 - SDSS Pre-Burst Observations
  29. GRB 060814: TAROT optical observations
  30. GRB 060814: Swift detection of a bright burst
  31. GRB 060813: Swift XRT refined analysis
  32. GRB 060813: Swift detection of a burst
  33. GRB051109B: Late-time Radio Observations
  34. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  35. GRB 060729: An update on the Swift XRT and UVOT observations
  36. GRB060717: optical observations
  37. GRB 060805B: XRT Team Analysis
  38. GRB060806 is similar to previous activity of SGR1806-20
  39. GRB 060807: XRT Team refined analysis
  40. GRB 060807: Refined analysis of the Swift-BAT burst
  41. GRB060807: optical afterglow candidate
  42. GRB 060805B: RHESSI Spectral Fit
  43. IPN triangulation of GRB060806 (long, exceptionally bright)
  44. GRB060807 - SDSS Pre-burst Observations
  45. GRB 060805B: Swift/UVOT Upper Limits
  46. GRB 060807, optical observation
  47. GRB 060807: Kanazawa R-band observation
  48. GRB060805 Liverpool Telescope observations
  49. GRB 060805: XRT Team Refined Analysis
  50. GRB 060805: Swift/UVOT Upper Limits
  51. GRB 060805: P60 Observations
  52. GRB 060805 - SDSS Pre-Burst Observations
  53. GRB 060804: Swift UVOT observations
  54. GRB 060804: Refined analysis of the Swift-BAT burst
  55. GRB 060728: Upper limits of the X-ray emission
  56. GRB 060801: no variability of optical sources
  57. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  58. GRB060801: Radio Observations
  59. GRB 051109B: Bright spiral host galaxy at low redshift
  60. GRB060801: Swift/UVOT Upper Limits
  61. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  62. GRB 060801, optical observation
  63. GRB 060801: Kanazawa Optical Observation
  64. GRB 060719: TORTOREM optical upper limits
  65. GRB 060729: Refined analysis of the Swift-BAT burst
  66. GRB 060729: Swift/UVOT Observations
  67. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  68. GRB 060728: Swift/UVOT Upper Limits
  69. GRB 060728, SMARTS optical/IR observations
  70. Swift/XRT preliminary analysis
  71. GRB 060728: Swift detection of a burst
  72. GRB 060714: Swift/UVOT Observations
  73. GRB060719: prompt NIR observations with REM
  74. GRB 060714: NOT observations
  75. GRB 060719: near-infrared afterglow
  76. GRB 060522: VLA observation
  77. GRB 060719: Swift/UVOT Upper Limits
  78. GRB 060719: VLT/ISAAC observations
  79. GRB060719: REM NIR Observations
  80. GRB 060719: VLT observations
  81. GRB 060719: LCO optical observations
  82. GRB 060719: Swift detection of a burst
  83. GRB060717: Swift/UVOT upper limits
  84. GRB060717 - SDSS Pre-burst Observations
  85. GRB 060714: REM infrared observations
  86. GRB 060717, optical observation
  87. GRB 060714 : Liverpool Telescope Observations
  88. GRB 060708: VLT spectroscopy
  89. GRB060707 possible optical confirmation
  90. Swift trigger 219136 is probably not a GRB
  91. GRB 060714, optical observation
  92. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  93. GRB060712: P60 Observations
  94. GRB 060712: Swift/UVOT Upper Limits
  95. GRB 060712: XRT refined position
  96. GRB 060707: OA fading and redshift
  97. GRB 060708: Swift-XRT refined analysis
  98. GCN 060708: Swift-UVOT Observations
  99. GCN 060707: Swift-UVOT observations
  100. GRB 060708: Swift detection of a burst with an UVOT countpart

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