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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"

28059 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 060901: Swift/XRT Position
  11. GRB 060901: a long GRB detected by INTEGRAL
  12. Two bright bursts from SGR 1806-20 detected with IBAS
  13. GRB 060605, observations using an Integral Field Unit
  14. GRB 060604: VLA Observation
  15. GRB 060814: Suzaku/WAM observation of the prompt emission
  16. GRB 060605: VLA Observation
  17. GRB 060707: VLA observation
  18. GRB 060825: VLA observations
  19. GRB060826 - SDSS Pre-Burst Observations
  20. GRB 060826(?): Swift detection of a possible burst
  21. GRB 060825: XRT Team Refined Analysis
  22. GRB 060825: Swift-BAT Refined Analysis
  23. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  24. GRB 060825: TNG optical observations
  25. GRB 060825: TAROT optical observations
  26. GRB 060825: P60 Observations
  27. GRB 060825: Swift detection of a burst
  28. GRB060801: host galaxy redshift
  29. GRB060729: analysis of XMM-Newton observation
  30. GRB 060729, SMARTS optical/IR observations
  31. GRB 060813: A long, bright GRB detected with Suzaku WAM
  32. Konus-Wind observation of GRB 060814
  33. GRB 060814: Refined analysis of the Swift-BAT burst
  34. GRB 060814: P60 Observations
  35. GRB 060814: P200 NIR Observations
  36. GRB060805B: optical observations
  37. GRB 060814: Swift XRT refined analysis
  38. GRB 060814: VLT optical limits
  39. GRB 060814 - SDSS Pre-Burst Observations
  40. GRB 060814: TAROT optical observations
  41. GRB 060814: Swift detection of a bright burst
  42. Konus-Wind observation of GRB 060813
  43. GRB 060813: Swift XRT refined analysis
  44. GRB 060813: Refined analysis of the Swift-BAT burst
  45. GRB 060813: Swift detection of a burst
  46. GRB051109B: Late-time Radio Observations
  47. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  48. GRB060807: Possible Highly Significant X-ray Emission Lines
  49. GRB 060729: An update on the Swift XRT and UVOT observations
  50. GRB060717: optical observations
  51. GRB060807: Optical limiting magnitudes
  52. GRB 060805B: XRT Team Analysis
  53. GRB060806 is similar to previous activity of SGR1806-20
  54. GRB 060807: XRT Team refined analysis
  55. GRB 060807: Refined analysis of the Swift-BAT burst
  56. GRB060807: optical afterglow candidate
  57. IPN triangulation of GRB060806 (long, exceptionally bright)
  58. GRB060807 - SDSS Pre-burst Observations
  59. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  60. GRB 060805B: Swift/UVOT Upper Limits
  61. GRB 060807, optical observation
  62. GRB 060807: Kanazawa R-band observation
  63. GRB 060807: Swift detection of a burst
  64. GRB060805 Liverpool Telescope observations
  65. GRB 060805: XRT Team Refined Analysis
  66. GRB 060805: Swift-BAT Refined Analysis
  67. GRB 060805: Swift/UVOT Upper Limits
  68. GRB 060805: P60 Observations
  69. GRB 060805 - SDSS Pre-Burst Observations
  70. GRB 060804: Swift UVOT observations
  71. GRB 060804: Swift-XRT Team Refined Analysis
  72. GRB 060804: Refined analysis of the Swift-BAT burst
  73. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  74. GRB 060728: Upper limits of the X-ray emission
  75. GRB 060801: no variability of optical sources
  76. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  77. GRB060801: Radio Observations
  78. GRB 051109B: Bright spiral host galaxy at low redshift
  79. GRB060801: Swift/UVOT Upper Limits
  80. GRB 060801: optical observations at Hanle and Calar Alto
  81. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  82. GRB 060801, optical observation
  83. GRB 060801: Kanazawa Optical Observation
  84. GRB 060719: TORTOREM optical upper limits
  85. GRB 060729: Refined analysis of the Swift-BAT burst
  86. GRB 060729: Swift-XRT refined analysis
  87. GRB 060729: Swift/UVOT Observations
  88. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  89. GRB 060728: Swift/UVOT Upper Limits
  90. GRB 060728, SMARTS optical/IR observations
  91. Swift/XRT preliminary analysis
  92. GRB 060728: Swift detection of a burst
  93. GRB 060714: Swift/UVOT Observations
  94. GRB060719: prompt NIR observations with REM
  95. GRB 060714: NOT observations
  96. GRB 060719: near-infrared afterglow
  97. GRB 060719: correction to the coordinates reported in GCN 5347
  98. GRB 060522: VLA observation
  99. GRB 060719: Swift/UVOT Upper Limits
  100. GRB 060719: VLT/ISAAC observations

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