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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"

26507 results found.

  1. GRB 060904: TAROT optical observations
  2. GRB 060904B: Swift detection of a burst with optical counterpart
  3. GRB060904 - SDSS Pre-Burst Observations
  4. GRB 060904: Swift detection of a bright burst
  5. GRB060901: Optical observations
  6. 060901: Swift UVOT followup observations
  7. Konus-Wind observation of GRB 060901
  8. GRB 060901: Swift/XRT Refined Analysis
  9. Two bright bursts from SGR 1806-20 detected with IBAS
  10. GRB 060605, observations using an Integral Field Unit
  11. GRB 060604: VLA Observation
  12. GRB 060814: Suzaku/WAM observation of the prompt emission
  13. GRB 060605: VLA Observation
  14. GRB 060707: VLA observation
  15. GRB 060825: VLA observations
  16. GRB060826 - SDSS Pre-Burst Observations
  17. GRB 060826(?): Swift detection of a possible burst
  18. GRB 060825: XRT Team Refined Analysis
  19. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  20. GRB060825: Liverpool Telescope optical observations
  21. GRB 060825: TNG optical observations
  22. GRB 060825: TAROT optical observations
  23. GRB 060825: P60 Observations
  24. GRB060729: analysis of XMM-Newton observation
  25. GRB 060729, SMARTS optical/IR observations
  26. Konus-Wind observation of GRB 060814
  27. GRB 060814: P60 Observations
  28. GRB 060814: P200 NIR Observations
  29. GRB 060813: pseudo-z from spectral parameters of the prompt
  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. GRB 060813: Swift XRT refined analysis
  36. GRB 060813: Swift detection of a burst
  37. GRB051109B: Late-time Radio Observations
  38. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  39. GRB060807: Possible Highly Significant X-ray Emission Lines
  40. GRB 060729: An update on the Swift XRT and UVOT observations
  41. GRB060717: optical observations
  42. GRB060807: Optical limiting magnitudes
  43. GRB 060805B: XRT Team Analysis
  44. GRB060806 is similar to previous activity of SGR1806-20
  45. GRB 060807: XRT Team refined analysis
  46. GRB060807: optical afterglow candidate
  47. GRB 060805B: RHESSI Spectral Fit
  48. IPN triangulation of GRB060806 (long, exceptionally bright)
  49. GRB060807 - SDSS Pre-burst Observations
  50. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  51. GRB 060805B: Swift/UVOT Upper Limits
  52. GRB 060807, optical observation
  53. GRB 060807: Kanazawa R-band observation
  54. GRB 060807: Swift detection of a burst
  55. GRB060805 Liverpool Telescope observations
  56. GRB 060805: XRT Team Refined Analysis
  57. GRB 060805: Swift/UVOT Upper Limits
  58. GRB 060805: P60 Observations
  59. GRB 060805 - SDSS Pre-Burst Observations
  60. GRB 060804: Swift UVOT observations
  61. GRB 060804: Swift-XRT Team Refined Analysis
  62. GRB 060804: Refined analysis of the Swift-BAT burst
  63. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  64. GRB 060728: Upper limits of the X-ray emission
  65. GRB 060801: no variability of optical sources
  66. GRB 060801: WSRT Radio Observations
  67. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  68. GRB060801: Radio Observations
  69. GRB 051109B: Bright spiral host galaxy at low redshift
  70. GRB060801: Swift/UVOT Upper Limits
  71. GRB 060801: Swift XRT refined analysis
  72. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  73. GRB 060801, optical observation
  74. GRB 060801: Kanazawa Optical Observation
  75. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  76. GRB 060719: TORTOREM optical upper limits
  77. GRB 060729: Refined analysis of the Swift-BAT burst
  78. GRB 060729: Swift-XRT refined analysis
  79. GRB 060729: Swift/UVOT Observations
  80. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  81. GRB 060728: Swift/UVOT Upper Limits
  82. GRB 060728, SMARTS optical/IR observations
  83. Swift/XRT preliminary analysis
  84. GRB 060728: Swift detection of a burst
  85. GRB 060714: Swift/UVOT Observations
  86. GRB060719: prompt NIR observations with REM
  87. GRB 060714: NOT observations
  88. GRB 060719: near-infrared afterglow
  89. GRB 060719: correction to the coordinates reported in GCN 5347
  90. GRB 060522: VLA observation
  91. GRB 060719: Swift/UVOT Upper Limits
  92. GRB 060719: VLT/ISAAC observations
  93. GRB 060719: XRT refined analysis
  94. GRB 060719: further analysis of VLT observations
  95. GRB060719: REM NIR Observations
  96. GRB 060719: VLT observations
  97. GRB 060719: LCO optical observations
  98. GRB 060719: Swift detection of a burst
  99. GRB 060717: Swift XRT refined analysis
  100. GRB060717: Swift/UVOT upper limits

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