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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"

32507 results found.

  1. GRB 060912A: Redshift of probable host galaxy
  2. GRB 060926: BOOTES-IR observations
  3. GRB060926 OPTIMA-Burst optical observation
  4. GRB 060926: MASTER optical observation
  5. GRB 060923C, Swift-BAT refined analysis
  6. GRB 060923C: VLA Observation
  7. GRB 060923C: NIR afterglow confirmed
  8. GRB060923C: AROMA optical obsevation
  9. GRB 060923C: Gemini Observations and Afterglow Candidate
  10. GRB 060923C, optical observation
  11. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  12. GRB 060923C: VLT J-band observations
  13. GRB060923B: Swift/UVOT upper limits
  14. GRB 060923B: Swift XRT Refined Analysis
  15. GRB 060923C: Swift XRT refined analysis
  16. GRB 060923C, Swift-BAT partial refined analysis
  17. GRB 060923A: Swift XRT refined analysis
  18. GRB 060923C: Keck Observations
  19. GRB 060923A: Keck and Gemini Observations
  20. GRB 060923B, Swift-BAT refined analysis
  21. GRB060923C : Faulkes Telescope South optical limits
  22. GRB060923C: Faulkes Telescope North optical observations
  23. GRB 060923C: optical observation
  24. GRB 060923, Swift-BAT refined analysis
  25. GRB 060923: Early Super-LOTIS Observations
  26. GRB 060923: UKIRT nIR observations - candidate afterglow
  27. GRB060923: Faulkes Telescope North optical observations
  28. GRB060923 - SDSS Pre-Burst Observations
  29. GRB 060923: KAIT observations
  30. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  31. GRB060919: Swift/UVOT optical observations
  32. GRB 060919 : Faulkes South Telescope Observations
  33. GRB 060919, Swift-BAT refined analysis
  34. GRB060919: XRT refined analysis
  35. GRB 060912A: VLA Observation
  36. GRB 060912A: Probable Host Galaxy
  37. GRB060825: MAGIC telescope GeV observation
  38. Konus-Wind observation of GRB 060912
  39. GRB 060912: Redshift of nearby 2MASS galaxy
  40. GRB060912: optical observations
  41. GRB060912: Swift/UVOT Observations
  42. GRB060912: OPTIMA-Burst optical observations
  43. GRB 060912: Swift XRT Team Refined Analysis
  44. GRB 060912, Swift-BAT refined analysis
  45. GRB 060912: Correction to GCN 5559
  46. VLA observations of GRB 060908
  47. GRB 060908: redshift
  48. GRB 060908, Swift/XRT refined analysis
  49. GRB 060908: Swift/UVOT Observations
  50. GRB 060908: Danish/DFOSC optical observations
  51. GRB 060908, Swift-BAT refined analysis
  52. GRB 060904B : CFHT/WIRCam NIR afterglow observations
  53. GRB 060908: REM optical prompt observation
  54. GRB 060904A: Suzaku/WAM observation of the prompt emission
  55. GRB060906 , optical observation
  56. GRB060904b optical detections (delayed report due to internet outage)
  57. GRB 060906: optical observation
  58. GRB 060906: Early RAPTOR optical limits
  59. GRB 060906, Swift-BAT refined spectral analysis
  60. GRB 060906: Swift/XRT Refined Analysis
  61. GRB 060906: Swift-UVOT observations
  62. VLT redshift of GRB 060906
  63. GRB 060906, Swift-BAT refined analysis
  64. GRB 060906: FRAM observations - flash determination (airplane)
  65. GRB 060906: KAIT observations
  66. GRB 060906: Confirmation of P60 Optical Afterglow
  67. GRB 060906: observations with FRAM
  68. GRB 060904A Milagro GeV/TeV Observations
  69. GRB060904b, optical observations
  70. GRB 060904b: SMARTS optical/IR afterglow observations
  71. GRB 060904B: RTT150 optical observations
  72. GRB060904A: Swift/UVOT optical observations
  73. GRB 060904A: Subaru NIR observation
  74. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  75. GRB 060904B: Swift-BAT refined analysis
  76. GRB060904b: Optical observations with Swift/UVOT
  77. Konus-Wind observation of GRB 060904A
  78. GRB 060904B: Swift-XRT refined analysis
  79. GRB 060904A: Refined analysis of the Swift-BAT burst
  80. GRB 060904A: Swift-XRT refined analysis
  81. GRB 060904A: Suzaku-XIS and -HXD observation plan
  82. GRB 060904B: VLT redshift
  83. GRB 060904A: P60 Observations
  84. GRB060904B: Watcher observations
  85. GRB 060904B BOOTES-IR and 1.5m OSN observations
  86. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  87. 060901: Swift UVOT followup observations
  88. Konus-Wind observation of GRB 060901
  89. GRB 060901: SMARTS optical/IR observations update
  90. GRB 060901: Swift/XRT Refined Analysis
  91. GRB 060901: SMARTS optical/IR observations
  92. GRB 060901: Swift/XRT Position
  93. GRB 060901: Watcher observations
  94. GRB 060605, observations using an Integral Field Unit
  95. GRB 060604: VLA Observation
  96. GRB 060814: Suzaku/WAM observation of the prompt emission
  97. GRB 060605: VLA Observation
  98. GRB 060707: VLA observation
  99. GRB 060825: VLA observations
  100. Swift-BAT trigger 226614 is not a GRB

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