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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"

32484 results found.

  1. GRB 060923, Swift-BAT refined analysis
  2. GRB 060923: Early Super-LOTIS Observations
  3. GRB 060923: UKIRT nIR observations - candidate afterglow
  4. GRB060923: Faulkes Telescope North optical observations
  5. GRB060923 - SDSS Pre-Burst Observations
  6. GRB 060923: KAIT observations
  7. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  8. GRB060919: Swift/UVOT optical observations
  9. GRB 060919 : Faulkes South Telescope Observations
  10. GRB 060919, Swift-BAT refined analysis
  11. GRB060919: XRT refined analysis
  12. GRB 060912A: VLA Observation
  13. GRB 060912A: Probable Host Galaxy
  14. GRB060825: MAGIC telescope GeV observation
  15. Konus-Wind observation of GRB 060912
  16. GRB 060912: Redshift of nearby 2MASS galaxy
  17. GRB060912: optical observations
  18. GRB060912: Swift/UVOT Observations
  19. GRB060912: OPTIMA-Burst optical observations
  20. GRB 060912: Swift XRT Team Refined Analysis
  21. GRB 060912, Swift-BAT refined analysis
  22. GRB 060912: Correction to GCN 5559
  23. VLA observations of GRB 060908
  24. GRB 060908: redshift
  25. GRB 060908, Swift/XRT refined analysis
  26. GRB 060908: Swift/UVOT Observations
  27. GRB 060908: Danish/DFOSC optical observations
  28. GRB 060908, Swift-BAT refined analysis
  29. GRB 060904B : CFHT/WIRCam NIR afterglow observations
  30. GRB 060908: REM optical prompt observation
  31. GRB 060904A: Suzaku/WAM observation of the prompt emission
  32. GRB060906 , optical observation
  33. GRB060904b optical detections (delayed report due to internet outage)
  34. GRB 060906: optical observation
  35. GRB 060906: Early RAPTOR optical limits
  36. GRB 060906, Swift-BAT refined spectral analysis
  37. GRB 060906: Swift/XRT Refined Analysis
  38. GRB 060906: Swift-UVOT observations
  39. VLT redshift of GRB 060906
  40. GRB 060906, Swift-BAT refined analysis
  41. GRB 060906: FRAM observations - flash determination (airplane)
  42. GRB 060906: KAIT observations
  43. GRB 060906: Confirmation of P60 Optical Afterglow
  44. GRB 060906: observations with FRAM
  45. GRB 060904A Milagro GeV/TeV Observations
  46. GRB060904b, optical observations
  47. GRB 060904b: SMARTS optical/IR afterglow observations
  48. GRB 060904B: RTT150 optical observations
  49. GRB060904A: Swift/UVOT optical observations
  50. GRB 060904A: Subaru NIR observation
  51. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  52. GRB 060904B: Swift-BAT refined analysis
  53. GRB060904b: Optical observations with Swift/UVOT
  54. Konus-Wind observation of GRB 060904A
  55. GRB 060904B: Swift-XRT refined analysis
  56. GRB 060904A: Refined analysis of the Swift-BAT burst
  57. GRB 060904A: Swift-XRT refined analysis
  58. GRB 060904A: Suzaku-XIS and -HXD observation plan
  59. GRB 060904B: VLT redshift
  60. GRB 060904A: P60 Observations
  61. GRB060904B: Watcher observations
  62. GRB 060904B BOOTES-IR and 1.5m OSN observations
  63. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  64. 060901: Swift UVOT followup observations
  65. Konus-Wind observation of GRB 060901
  66. GRB 060901: SMARTS optical/IR observations update
  67. GRB 060901: Swift/XRT Refined Analysis
  68. GRB 060901: SMARTS optical/IR observations
  69. GRB 060901: Swift/XRT Position
  70. GRB 060901: Watcher observations
  71. GRB 060605, observations using an Integral Field Unit
  72. GRB 060604: VLA Observation
  73. GRB 060814: Suzaku/WAM observation of the prompt emission
  74. GRB 060605: VLA Observation
  75. GRB 060707: VLA observation
  76. GRB 060825: VLA observations
  77. Swift-BAT trigger 226614 is not a GRB
  78. GRB 060825: XRT Team Refined Analysis
  79. GRB 060825: Swift-BAT Refined Analysis
  80. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  81. GRB060825: Liverpool Telescope optical observations
  82. GRB 060825: TNG optical observations
  83. GRB 060825: P60 Observations
  84. GRB060825: BOOTES-IR optical observations
  85. GRB060801: host galaxy redshift
  86. Radio observations of GRB 060719
  87. GRB 060729, SMARTS optical/IR observations
  88. GRB 060813: A long, bright GRB detected with Suzaku WAM
  89. GRB 060814: Confirmation of IR afterglow
  90. Konus-Wind observation of GRB 060814
  91. GRB 060814: Refined analysis of the Swift-BAT burst
  92. GRB 060814: P60 Observations
  93. GRB 060814: P200 NIR Observations
  94. GRB 060814: source inside revised XRT error box
  95. GRB 060814: Possible IR counterpart
  96. GRB060805B: optical observations
  97. GRB060814: Swift/UVOT upper limits
  98. GRB 060813: pseudo-z from spectral parameters of the prompt
  99. GRB 060814: Swift XRT refined analysis
  100. GRB 060814: VLT optical limits

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