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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"

27779 results found.

  1. GRB 060923B: Swift detection of a burst
  2. GRB 060923, Swift-BAT refined analysis
  3. GRB 060923: Early Super-LOTIS Observations
  4. GRB060923: Faulkes Telescope North optical observations
  5. GRB 060923: KAIT observations
  6. GRB 060923: Swift detection of a burst
  7. Swift detection of IGR J17497-2821 (trigger 230504)
  8. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  9. GRB060919: Swift/UVOT optical observations
  10. GRB 060919, Swift-BAT refined analysis
  11. GRB060919: XRT refined analysis
  12. GRB 060919: TAROT optical observations
  13. GRB 060919: Swift detection of a burst
  14. GRB 060912A: VLA Observation
  15. GRB060825: MAGIC telescope GeV observation
  16. Konus-Wind observation of GRB 060912
  17. GRB060912: Swift/UVOT Observations
  18. GRB060912: OPTIMA-Burst optical observations
  19. GRB 060912: Swift XRT Team Refined Analysis
  20. GRB 060912, Swift-BAT refined analysis
  21. GRB 060912: Swift detection of a burst with an optical afterglow
  22. VLA observations of GRB 060908
  23. GRB 060908, Swift/XRT refined analysis
  24. GRB 060908: Swift/UVOT Observations
  25. GRB 060908, Swift-BAT refined analysis
  26. GRB 060908 - SDSS Pre-burst Observations
  27. GRB 060908: PROMPT Detection of a Bright Counterpart
  28. GRB 060908: Swift detection of a burst with a bright optical counterpart
  29. GRB 060904A: Suzaku/WAM observation of the prompt emission
  30. GRB060904b optical detections (delayed report due to internet outage)
  31. GRB 060906: Early RAPTOR optical limits
  32. GRB 060906, Swift-BAT refined spectral analysis
  33. GRB 060906: Swift/XRT Refined Analysis
  34. GRB 060906: Swift-UVOT observations
  35. VLT redshift of GRB 060906
  36. GRB 060906, Swift-BAT refined analysis
  37. GRB 060906: KAIT observations
  38. GRB 060906 (?): P60 Optical Afterglow Candidate
  39. GRB 060906: Swift detection of a probable burst
  40. GRB 060904A Milagro GeV/TeV Observations
  41. GRB060904A: Swift/UVOT optical observations
  42. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  43. GRB 060904B: Swift-BAT refined analysis
  44. GRB060904b: Optical observations with Swift/UVOT
  45. Konus-Wind observation of GRB 060904A
  46. GRB 060904B: Swift-XRT refined analysis
  47. GRB 060904A: Refined analysis of the Swift-BAT burst
  48. GRB 060904A: Swift-XRT refined analysis
  49. GRB 060904A: Suzaku-XIS and -HXD observation plan
  50. GRB 060904B: Optical observations at Crni Vrh
  51. GRB060904B: Watcher observations
  52. GRB 060904B BOOTES-IR and 1.5m OSN observations
  53. GRB 060904B: TAROT optical counterpart observations
  54. GRB060904B - SDSS Pre-Burst Observations
  55. GRB 060904: TAROT optical observations
  56. GRB 060904B: Swift detection of a burst with optical counterpart
  57. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  58. GRB060904 - SDSS Pre-Burst Observations
  59. GRB 060904: Swift detection of a bright burst
  60. 060901: Swift UVOT followup observations
  61. GRB 060901: SMARTS optical/IR observations update
  62. GRB 060901: Swift/XRT Refined Analysis
  63. GRB 060901: SMARTS optical/IR observations
  64. GRB 060901: Swift/XRT Position
  65. GRB 060901: Watcher observations
  66. GRB 060604: VLA Observation
  67. GRB 060814: Suzaku/WAM observation of the prompt emission
  68. GRB 060605: VLA Observation
  69. GRB 060707: VLA observation
  70. GRB 060825: VLA observations
  71. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  72. Swift-BAT trigger 226614 is not a GRB
  73. GRB060826 - SDSS Pre-Burst Observations
  74. GRB 060826(?): Swift detection of a possible burst
  75. GRB 060825: XRT Team Refined Analysis
  76. GRB 060825: Swift-BAT Refined Analysis
  77. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  78. GRB060825: Liverpool Telescope optical observations
  79. GRB 060825: TAROT optical observations
  80. GRB060825: BOOTES-IR optical observations
  81. GRB 060825: Swift detection of a burst
  82. GRB060729: analysis of XMM-Newton observation
  83. GRB 060814: pseudo-z from spectral parameters of the prompt
  84. Radio observations of GRB 060719
  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. Konus-Wind observation of GRB 060814
  89. GRB 060814: Refined analysis of the Swift-BAT burst
  90. GRB060805B: optical observations
  91. GRB060814: Swift/UVOT upper limits
  92. GRB 060813: pseudo-z from spectral parameters of the prompt
  93. GRB 060814: Swift XRT refined analysis
  94. GRB 060814 - SDSS Pre-Burst Observations
  95. GRB 060814: TAROT optical observations
  96. GRB 060814: Swift detection of a bright burst
  97. Konus-Wind observation of GRB 060813
  98. GRB060813: Swift/UVOT upper limits
  99. GRB 060813: Swift XRT refined analysis
  100. GRB 060813: Refined analysis of the Swift-BAT burst

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