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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"

26361 results found.

  1. GRB 060904A: P60 Observations
  2. GRB 060904B: Optical observations at Crni Vrh
  3. GRB 060904B: TAROT optical counterpart observations
  4. GRB060904B - SDSS Pre-Burst Observations
  5. GRB 060904: TAROT optical observations
  6. GRB 060904B: Swift detection of a burst with optical counterpart
  7. GRB060904 - SDSS Pre-Burst Observations
  8. GRB 060904: Swift detection of a bright burst
  9. GRB060901: Optical observations
  10. 060901: Swift UVOT followup observations
  11. GRB 060901: Swift/XRT Refined Analysis
  12. GRB 060901: Swift/XRT Position
  13. GRB 060901: a long GRB detected by INTEGRAL
  14. Two bright bursts from SGR 1806-20 detected with IBAS
  15. GRB 060605, observations using an Integral Field Unit
  16. GRB 060604: VLA Observation
  17. GRB 060814: Suzaku/WAM observation of the prompt emission
  18. GRB 060605: VLA Observation
  19. GRB 060707: VLA observation
  20. GRB 060825: VLA observations
  21. GRB060826 - SDSS Pre-Burst Observations
  22. GRB 060826(?): Swift detection of a possible burst
  23. GRB 060825: XRT Team Refined Analysis
  24. GRB 060825: Swift-BAT Refined Analysis
  25. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  26. GRB 060825: TNG optical observations
  27. GRB 060825: TAROT optical observations
  28. GRB 060825: P60 Observations
  29. GRB 060825: Swift detection of a burst
  30. GRB060801: host galaxy redshift
  31. GRB060729: analysis of XMM-Newton observation
  32. GRB 060729, SMARTS optical/IR observations
  33. GRB 060813: A long, bright GRB detected with Suzaku WAM
  34. Konus-Wind observation of GRB 060814
  35. GRB 060814: Refined analysis of the Swift-BAT burst
  36. GRB 060814: P60 Observations
  37. GRB 060814: P200 NIR Observations
  38. GRB060805B: optical observations
  39. GRB 060814: Swift XRT refined analysis
  40. GRB 060814: VLT optical limits
  41. GRB 060814 - SDSS Pre-Burst Observations
  42. GRB 060814: TAROT optical observations
  43. GRB 060814: Swift detection of a bright burst
  44. Konus-Wind observation of GRB 060813
  45. GRB 060813: Swift XRT refined analysis
  46. GRB 060813: Refined analysis of the Swift-BAT burst
  47. GRB 060813: Swift detection of a burst
  48. GRB051109B: Late-time Radio Observations
  49. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  50. GRB060807: Possible Highly Significant X-ray Emission Lines
  51. GRB 060729: An update on the Swift XRT and UVOT observations
  52. GRB060717: optical observations
  53. GRB060807: Optical limiting magnitudes
  54. GRB 060805B: XRT Team Analysis
  55. GRB060806 is similar to previous activity of SGR1806-20
  56. GRB 060807: XRT Team refined analysis
  57. GRB 060807: Refined analysis of the Swift-BAT burst
  58. GRB060807: optical afterglow candidate
  59. IPN triangulation of GRB060806 (long, exceptionally bright)
  60. GRB060807 - SDSS Pre-burst Observations
  61. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  62. GRB 060805B: Swift/UVOT Upper Limits
  63. GRB 060807, optical observation
  64. GRB 060807: Kanazawa R-band observation
  65. GRB 060807: Swift detection of a burst
  66. GRB060805 Liverpool Telescope observations
  67. GRB 060805: XRT Team Refined Analysis
  68. GRB 060805: Swift-BAT Refined Analysis
  69. GRB 060805: Swift/UVOT Upper Limits
  70. GRB 060805: P60 Observations
  71. GRB 060805 - SDSS Pre-Burst Observations
  72. GRB 060804: Swift UVOT observations
  73. GRB 060804: Swift-XRT Team Refined Analysis
  74. GRB 060804: Refined analysis of the Swift-BAT burst
  75. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  76. GRB 060728: Upper limits of the X-ray emission
  77. GRB 060801: no variability of optical sources
  78. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  79. GRB060801: Radio Observations
  80. GRB 051109B: Bright spiral host galaxy at low redshift
  81. GRB060801: Swift/UVOT Upper Limits
  82. GRB 060801: optical observations at Hanle and Calar Alto
  83. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  84. GRB 060801, optical observation
  85. GRB 060801: Kanazawa Optical Observation
  86. GRB 060719: TORTOREM optical upper limits
  87. GRB 060729: Refined analysis of the Swift-BAT burst
  88. GRB 060729: Swift-XRT refined analysis
  89. GRB 060729: Swift/UVOT Observations
  90. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  91. GRB 060728: Swift/UVOT Upper Limits
  92. GRB 060728, SMARTS optical/IR observations
  93. Swift/XRT preliminary analysis
  94. GRB 060728: Swift detection of a burst
  95. GRB 060714: Swift/UVOT Observations
  96. GRB060719: prompt NIR observations with REM
  97. GRB 060714: NOT observations
  98. GRB 060719: near-infrared afterglow
  99. GRB 060719: correction to the coordinates reported in GCN 5347
  100. GRB 060522: VLA observation

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