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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"

26374 results found.

  1. GRB 060906: Early RAPTOR optical limits
  2. GRB 060906, Swift-BAT refined spectral analysis
  3. GRB 060906: Swift/XRT Refined Analysis
  4. VLT redshift of GRB 060906
  5. GRB 060906, Swift-BAT refined analysis
  6. GRB 060906: Confirmation of P60 Optical Afterglow
  7. GRB 060906 (?): P60 Optical Afterglow Candidate
  8. GRB060904b, optical observations
  9. GRB060904A: Swift/UVOT optical observations
  10. GRB 060904A: Subaru NIR observation
  11. GRB 060904B: Swift-BAT refined analysis
  12. GRB 060904A: Refined analysis of the Swift-BAT burst
  13. GRB 060904A: Suzaku-XIS and -HXD observation plan
  14. GRB 060904A: P60 Observations
  15. GRB 060904B: Optical observations at Crni Vrh
  16. GRB 060904B: TAROT optical counterpart observations
  17. GRB060904B - SDSS Pre-Burst Observations
  18. GRB 060904: TAROT optical observations
  19. GRB 060904B: Swift detection of a burst with optical counterpart
  20. GRB060904 - SDSS Pre-Burst Observations
  21. GRB 060904: Swift detection of a bright burst
  22. GRB060901: Optical observations
  23. 060901: Swift UVOT followup observations
  24. GRB 060901: Swift/XRT Refined Analysis
  25. GRB 060901: Swift/XRT Position
  26. GRB 060901: a long GRB detected by INTEGRAL
  27. Two bright bursts from SGR 1806-20 detected with IBAS
  28. GRB 060605, observations using an Integral Field Unit
  29. GRB 060604: VLA Observation
  30. GRB 060814: Suzaku/WAM observation of the prompt emission
  31. GRB 060605: VLA Observation
  32. GRB 060707: VLA observation
  33. GRB 060825: VLA observations
  34. GRB060826 - SDSS Pre-Burst Observations
  35. GRB 060826(?): Swift detection of a possible burst
  36. GRB 060825: XRT Team Refined Analysis
  37. GRB 060825: Swift-BAT Refined Analysis
  38. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  39. GRB 060825: TNG optical observations
  40. GRB 060825: TAROT optical observations
  41. GRB 060825: P60 Observations
  42. GRB 060825: Swift detection of a burst
  43. GRB060801: host galaxy redshift
  44. GRB060729: analysis of XMM-Newton observation
  45. GRB 060729, SMARTS optical/IR observations
  46. GRB 060813: A long, bright GRB detected with Suzaku WAM
  47. Konus-Wind observation of GRB 060814
  48. GRB 060814: Refined analysis of the Swift-BAT burst
  49. GRB 060814: P60 Observations
  50. GRB 060814: P200 NIR Observations
  51. GRB060805B: optical observations
  52. GRB 060814: Swift XRT refined analysis
  53. GRB 060814: VLT optical limits
  54. GRB 060814 - SDSS Pre-Burst Observations
  55. GRB 060814: TAROT optical observations
  56. GRB 060814: Swift detection of a bright burst
  57. Konus-Wind observation of GRB 060813
  58. GRB 060813: Swift XRT refined analysis
  59. GRB 060813: Refined analysis of the Swift-BAT burst
  60. GRB 060813: Swift detection of a burst
  61. GRB051109B: Late-time Radio Observations
  62. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  63. GRB060807: Possible Highly Significant X-ray Emission Lines
  64. GRB 060729: An update on the Swift XRT and UVOT observations
  65. GRB060717: optical observations
  66. GRB060807: Optical limiting magnitudes
  67. GRB 060805B: XRT Team Analysis
  68. GRB060806 is similar to previous activity of SGR1806-20
  69. GRB 060807: XRT Team refined analysis
  70. GRB 060807: Refined analysis of the Swift-BAT burst
  71. GRB060807: optical afterglow candidate
  72. IPN triangulation of GRB060806 (long, exceptionally bright)
  73. GRB060807 - SDSS Pre-burst Observations
  74. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  75. GRB 060805B: Swift/UVOT Upper Limits
  76. GRB 060807, optical observation
  77. GRB 060807: Kanazawa R-band observation
  78. GRB 060807: Swift detection of a burst
  79. GRB060805 Liverpool Telescope observations
  80. GRB 060805: XRT Team Refined Analysis
  81. GRB 060805: Swift-BAT Refined Analysis
  82. GRB 060805: Swift/UVOT Upper Limits
  83. GRB 060805: P60 Observations
  84. GRB 060805 - SDSS Pre-Burst Observations
  85. GRB 060804: Swift UVOT observations
  86. GRB 060804: Swift-XRT Team Refined Analysis
  87. GRB 060804: Refined analysis of the Swift-BAT burst
  88. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  89. GRB 060728: Upper limits of the X-ray emission
  90. GRB 060801: no variability of optical sources
  91. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  92. GRB060801: Radio Observations
  93. GRB 051109B: Bright spiral host galaxy at low redshift
  94. GRB060801: Swift/UVOT Upper Limits
  95. GRB 060801: optical observations at Hanle and Calar Alto
  96. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  97. GRB 060801, optical observation
  98. GRB 060801: Kanazawa Optical Observation
  99. GRB 060719: TORTOREM optical upper limits
  100. GRB 060729: Refined analysis of the Swift-BAT burst

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