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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"

26352 results found.

  1. 060901: Swift UVOT followup observations
  2. GRB 060901: Swift/XRT Refined Analysis
  3. GRB 060901: Swift/XRT Position
  4. GRB 060901: a long GRB detected by INTEGRAL
  5. Two bright bursts from SGR 1806-20 detected with IBAS
  6. GRB 060605, observations using an Integral Field Unit
  7. GRB 060604: VLA Observation
  8. GRB 060814: Suzaku/WAM observation of the prompt emission
  9. GRB 060605: VLA Observation
  10. GRB 060707: VLA observation
  11. GRB 060825: VLA observations
  12. GRB060826 - SDSS Pre-Burst Observations
  13. GRB 060826(?): Swift detection of a possible burst
  14. GRB 060825: XRT Team Refined Analysis
  15. GRB 060825: Swift-BAT Refined Analysis
  16. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  17. GRB 060825: TNG optical observations
  18. GRB 060825: TAROT optical observations
  19. GRB 060825: P60 Observations
  20. GRB 060825: Swift detection of a burst
  21. GRB060801: host galaxy redshift
  22. GRB060729: analysis of XMM-Newton observation
  23. GRB 060729, SMARTS optical/IR observations
  24. GRB 060813: A long, bright GRB detected with Suzaku WAM
  25. Konus-Wind observation of GRB 060814
  26. GRB 060814: Refined analysis of the Swift-BAT burst
  27. GRB 060814: P60 Observations
  28. GRB 060814: P200 NIR Observations
  29. GRB060805B: optical observations
  30. GRB 060814: Swift XRT refined analysis
  31. GRB 060814: VLT optical limits
  32. GRB 060814 - SDSS Pre-Burst Observations
  33. GRB 060814: TAROT optical observations
  34. GRB 060814: Swift detection of a bright burst
  35. Konus-Wind observation of GRB 060813
  36. GRB 060813: Swift XRT refined analysis
  37. GRB 060813: Refined analysis of the Swift-BAT burst
  38. GRB 060813: Swift detection of a burst
  39. GRB051109B: Late-time Radio Observations
  40. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  41. GRB060807: Possible Highly Significant X-ray Emission Lines
  42. GRB 060729: An update on the Swift XRT and UVOT observations
  43. GRB060717: optical observations
  44. GRB060807: Optical limiting magnitudes
  45. GRB 060805B: XRT Team Analysis
  46. GRB060806 is similar to previous activity of SGR1806-20
  47. GRB 060807: XRT Team refined analysis
  48. GRB 060807: Refined analysis of the Swift-BAT burst
  49. GRB060807: optical afterglow candidate
  50. IPN triangulation of GRB060806 (long, exceptionally bright)
  51. GRB060807 - SDSS Pre-burst Observations
  52. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  53. GRB 060805B: Swift/UVOT Upper Limits
  54. GRB 060807, optical observation
  55. GRB 060807: Kanazawa R-band observation
  56. GRB 060807: Swift detection of a burst
  57. GRB060805 Liverpool Telescope observations
  58. GRB 060805: XRT Team Refined Analysis
  59. GRB 060805: Swift-BAT Refined Analysis
  60. GRB 060805: Swift/UVOT Upper Limits
  61. GRB 060805: P60 Observations
  62. GRB 060805 - SDSS Pre-Burst Observations
  63. GRB 060804: Swift UVOT observations
  64. GRB 060804: Swift-XRT Team Refined Analysis
  65. GRB 060804: Refined analysis of the Swift-BAT burst
  66. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  67. GRB 060728: Upper limits of the X-ray emission
  68. GRB 060801: no variability of optical sources
  69. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  70. GRB060801: Radio Observations
  71. GRB 051109B: Bright spiral host galaxy at low redshift
  72. GRB060801: Swift/UVOT Upper Limits
  73. GRB 060801: optical observations at Hanle and Calar Alto
  74. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  75. GRB 060801, optical observation
  76. GRB 060801: Kanazawa Optical Observation
  77. GRB 060719: TORTOREM optical upper limits
  78. GRB 060729: Refined analysis of the Swift-BAT burst
  79. GRB 060729: Swift-XRT refined analysis
  80. GRB 060729: Swift/UVOT Observations
  81. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  82. GRB 060728: Swift/UVOT Upper Limits
  83. GRB 060728, SMARTS optical/IR observations
  84. Swift/XRT preliminary analysis
  85. GRB 060728: Swift detection of a burst
  86. GRB 060714: Swift/UVOT Observations
  87. GRB060719: prompt NIR observations with REM
  88. GRB 060714: NOT observations
  89. GRB 060719: near-infrared afterglow
  90. GRB 060719: correction to the coordinates reported in GCN 5347
  91. GRB 060522: VLA observation
  92. GRB 060719: Swift/UVOT Upper Limits
  93. GRB 060719: VLT/ISAAC observations
  94. GRB 060719: Refined analysis of the Swift-BAT burst
  95. GRB 060719: XRT refined analysis
  96. GRB 060719: further analysis of VLT observations
  97. GRB060719: REM NIR Observations
  98. GRB 060719: VLT observations
  99. GRB 060719: LCO optical observations
  100. GRB 060719: Swift detection of a burst

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