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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"

21394 results found.

  1. GRB060923C: Faulkes Telescope North optical observations
  2. GRB 060923C: Swift detection of a burst
  3. GRB 060923B: Swift detection of a burst
  4. GRB 060923, Swift-BAT refined analysis
  5. GRB 060923: Early Super-LOTIS Observations
  6. GRB 060923: UKIRT nIR observations - candidate afterglow
  7. GRB060923: Faulkes Telescope North optical observations
  8. GRB 060923: KAIT observations
  9. GRB 060923: Swift detection of a burst
  10. Swift detection of IGR J17497-2821 (trigger 230504)
  11. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  12. GRB060919: Swift/UVOT optical observations
  13. GRB 060919 : Faulkes South Telescope Observations
  14. GRB 060919, Swift-BAT refined analysis
  15. GRB060919: XRT refined analysis
  16. GRB 060919: TAROT optical observations
  17. GRB 060919: Swift detection of a burst
  18. GRB 060912A: VLA Observation
  19. GRB060825: MAGIC telescope GeV observation
  20. Konus-Wind observation of GRB 060912
  21. GRB060912: Swift/UVOT Observations
  22. GRB060912: OPTIMA-Burst optical observations
  23. GRB 060912: Swift XRT Team Refined Analysis
  24. GRB 060912, Swift-BAT refined analysis
  25. GRB 060912: Swift detection of a burst with an optical afterglow
  26. VLA observations of GRB 060908
  27. GRB 060908, Swift/XRT refined analysis
  28. GRB 060908: Swift/UVOT Observations
  29. GRB 060908, Swift-BAT refined analysis
  30. GRB 060908 - SDSS Pre-burst Observations
  31. GRB 060908: Swift detection of a burst with a bright optical counterpart
  32. GRB 060904A: Suzaku/WAM observation of the prompt emission
  33. GRB060904b optical detections (delayed report due to internet outage)
  34. GRB 060906: Early RAPTOR optical limits
  35. GRB 060906, Swift-BAT refined spectral analysis
  36. GRB 060906: Swift/XRT Refined Analysis
  37. GRB 060906: Swift-UVOT observations
  38. VLT redshift of GRB 060906
  39. GRB 060906, Swift-BAT refined analysis
  40. GRB 060906: FRAM observations - flash determination (airplane)
  41. GRB 060906: KAIT observations
  42. GRB 060906: observations with FRAM
  43. GRB 060906 (?): P60 Optical Afterglow Candidate
  44. GRB 060906: Swift detection of a probable burst
  45. GRB 060904A Milagro GeV/TeV Observations
  46. GRB060904A: Swift/UVOT optical observations
  47. GRB 060904A: Subaru NIR observation
  48. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  49. GRB 060904B: Swift-BAT refined analysis
  50. GRB060904b: Optical observations with Swift/UVOT
  51. Konus-Wind observation of GRB 060904A
  52. GRB 060904B: Swift-XRT refined analysis
  53. GRB 060904A: Refined analysis of the Swift-BAT burst
  54. GRB 060904A: Swift-XRT refined analysis
  55. GRB 060904A: Suzaku-XIS and -HXD observation plan
  56. GRB 060904A: P60 Observations
  57. GRB 060904B: Optical observations at Crni Vrh
  58. GRB060904B: Watcher observations
  59. GRB 060904B BOOTES-IR and 1.5m OSN observations
  60. GRB 060904B: TAROT optical counterpart observations
  61. GRB060904B - SDSS Pre-Burst Observations
  62. GRB 060904: TAROT optical observations
  63. GRB 060904B: Swift detection of a burst with optical counterpart
  64. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  65. GRB060904 - SDSS Pre-Burst Observations
  66. GRB 060904: Swift detection of a bright burst
  67. GRB060901: Optical observations
  68. 060901: Swift UVOT followup observations
  69. GRB 060901: Swift/XRT Refined Analysis
  70. GRB 060901: Swift/XRT Position
  71. GRB 060604: VLA Observation
  72. GRB 060814: Suzaku/WAM observation of the prompt emission
  73. GRB 060605: VLA Observation
  74. GRB 060707: VLA observation
  75. GRB 060825: VLA observations
  76. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  77. Swift-BAT trigger 226614 is not a GRB
  78. GRB060826 - SDSS Pre-Burst Observations
  79. GRB 060826(?): Swift detection of a possible burst
  80. GRB 060825: XRT Team Refined Analysis
  81. GRB 060825: Swift-BAT Refined Analysis
  82. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  83. GRB060825: Liverpool Telescope optical observations
  84. GRB 060825: TNG optical observations
  85. GRB 060825: TAROT optical observations
  86. GRB 060825: P60 Observations
  87. GRB060825: BOOTES-IR optical observations
  88. GRB 060825: Swift detection of a burst
  89. GRB060729: analysis of XMM-Newton observation
  90. GRB 060814: pseudo-z from spectral parameters of the prompt
  91. Radio observations of GRB 060719
  92. GRB060814: Break in the XRT light curve
  93. GRB060813: Break in the XRT light curve
  94. GRB 060813: A long, bright GRB detected with Suzaku WAM
  95. Konus-Wind observation of GRB 060814
  96. GRB 060814: Refined analysis of the Swift-BAT burst
  97. GRB 060814: P60 Observations
  98. GRB 060814: P200 NIR Observations
  99. GRB 060814: source inside revised XRT error box
  100. GRB 060814: Possible IR counterpart

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