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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"

44638 results found.

  1. GRB 060904B: Kiso Optical observation
  2. GRB 060904A : Optical limit
  3. GRB 060908: REM optical prompt observation
  4. GRB 060908: PROMPT Detection of a Bright Counterpart
  5. GRB 060908: Swift detection of a burst with a bright optical counterpart
  6. GRB 060904A: Suzaku/WAM observation of the prompt emission
  7. GRB060906 , optical observation
  8. GRB060904b optical detections (delayed report due to internet outage)
  9. GRB 060906: optical observation
  10. GRB 060906: Early RAPTOR optical limits
  11. GRB 060906, Swift-BAT refined spectral analysis
  12. GRB 060906: Swift/XRT Refined Analysis
  13. GRB 060906: Swift-UVOT observations
  14. VLT redshift of GRB 060906
  15. GRB 060906, Swift-BAT refined analysis
  16. GRB 060906: FRAM observations - flash determination (airplane)
  17. GRB 060906: KAIT observations
  18. GRB 060906: Confirmation of P60 Optical Afterglow
  19. GRB 060906: observations with FRAM
  20. GRB 060906 (?): P60 Optical Afterglow Candidate
  21. GRB 060906: Swift detection of a probable burst
  22. GRB 060904A Milagro GeV/TeV Observations
  23. GRB060904b, optical observations
  24. GRB 060904b: SMARTS optical/IR afterglow observations
  25. GRB 060904B: RTT150 optical observations
  26. GRB060904A: Swift/UVOT optical observations
  27. GRB 060904A: Subaru NIR observation
  28. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  29. GRB 060904B: Swift-BAT refined analysis
  30. GRB060904b: Optical observations with Swift/UVOT
  31. Konus-Wind observation of GRB 060904A
  32. GRB 060904B: Swift-XRT refined analysis
  33. GRB 060904A: Refined analysis of the Swift-BAT burst
  34. GRB 060904A: Swift-XRT refined analysis
  35. GRB 060904A: Suzaku-XIS and -HXD observation plan
  36. GRB 060904B: VLT redshift
  37. GRB 060904A: P60 Observations
  38. GRB 060904B: Optical observations at Crni Vrh
  39. GRB060904B: Watcher observations
  40. GRB 060904B BOOTES-IR and 1.5m OSN observations
  41. GRB 060904B: TAROT optical counterpart observations
  42. GRB060904B - SDSS Pre-Burst Observations
  43. GRB 060904: TAROT optical observations
  44. GRB 060904B: Swift detection of a burst with optical counterpart
  45. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  46. GRB060904 - SDSS Pre-Burst Observations
  47. GRB 060904: Swift detection of a bright burst
  48. GRB060901: Optical observations
  49. 060901: Swift UVOT followup observations
  50. GRB 060901: pseudo-z from spectral parameters of the prompt
  51. Konus-Wind observation of GRB 060901
  52. GRB 060901: SMARTS optical/IR observations update
  53. GRB 060901: Swift/XRT Refined Analysis
  54. GRB 060901: SMARTS optical/IR observations
  55. GRB 060901: Swift/XRT Position
  56. GRB 060901: further INTEGRAL results
  57. GRB 060901: Watcher observations
  58. GRB 060901: a long GRB detected by INTEGRAL
  59. Two bright bursts from SGR 1806-20 detected with IBAS
  60. GRB 060605, observations using an Integral Field Unit
  61. GRB 060604: VLA Observation
  62. GRB 060814: Suzaku/WAM observation of the prompt emission
  63. GRB 060605: VLA Observation
  64. GRB 060707: VLA observation
  65. GRB 060825: VLA observations
  66. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  67. Swift-BAT trigger 226614 is not a GRB
  68. GRB060826 - SDSS Pre-Burst Observations
  69. GRB 060826(?): Swift detection of a possible burst
  70. GRB 060825: XRT Team Refined Analysis
  71. GRB 060825: Swift-BAT Refined Analysis
  72. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  73. GRB060825: Liverpool Telescope optical observations
  74. GRB 060825: TNG optical observations
  75. GRB 060825: TAROT optical observations
  76. GRB 060825: P60 Observations
  77. GRB060825: BOOTES-IR optical observations
  78. GRB 060825: Swift detection of a burst
  79. GRB060801: host galaxy redshift
  80. GRB060729: analysis of XMM-Newton observation
  81. GRB 060814: pseudo-z from spectral parameters of the prompt
  82. IBAS Alerts No 3429 and 3430: not GRBs
  83. Radio observations of GRB 060719
  84. GRB 060729, SMARTS optical/IR observations
  85. GRB060814: Break in the XRT light curve
  86. GRB060813: Break in the XRT light curve
  87. GRB 060813: A long, bright GRB detected with Suzaku WAM
  88. GRB 060814: Confirmation of IR afterglow
  89. Konus-Wind observation of GRB 060814
  90. GRB 060814: Refined analysis of the Swift-BAT burst
  91. GRB 060814: P60 Observations
  92. GRB 060814: P200 NIR Observations
  93. GRB 060814: source inside revised XRT error box
  94. GRB 060814: Possible IR counterpart
  95. GRB060805B: optical observations
  96. GRB060814: Swift/UVOT upper limits
  97. GRB 060813: pseudo-z from spectral parameters of the prompt
  98. GRB 060814: Swift XRT refined analysis
  99. GRB 060814: VLT optical limits
  100. GRB 060814 - SDSS Pre-Burst Observations

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