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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"

21772 results found.

  1. GRB 061021: Swift detection of a burst
  2. GRB060904b: optical observations
  3. GRB 061019: SARA upper limit
  4. GRB 061019: Swift/UVOT upper limit
  5. GRB 061019, Swift-BAT refined analysis
  6. GRB 061019: TAROT La Silla observatory optical observations
  7. GRB 061019: REM K-band candidate afterglow
  8. GRB 061007: Suzaku/WAM observation of the prompt emission
  9. GRB 061006: astrometry-corrected XRT position
  10. Konus-Wind observation of GRB 061007
  11. GRB061007: Swift UVOT followup observations
  12. GRB 061006: optical afterglow
  13. GRB 061006 : Suzaku/WAM observation of the prompt emission
  14. GRB 061007: OA fading and VLT redshift
  15. GRB 061007: Swift-BAT refined analysis
  16. GRB 061007: Swift XRT refined analysis
  17. GRB 061006: Swift/UVOT optical observations
  18. Konus-Wind observation of the short hard GRB 061006
  19. GRB 061007: Swift detection of a burst with an optical counterpart
  20. GRB 061006: VLT observation
  21. GRB 060930: near-IR afterglow candidate retraction
  22. GRB 061006: Swift detection of a burst
  23. GRB 061004: Optical afterglow candidate and redshift
  24. GRB 061004: Swift detection of a burst
  25. Konus-Wind observation of GRB 060928
  26. GRB 060928: Suzaku/WAM observation of the prompt emission
  27. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  28. GRB 060928: Swift observations
  29. GRB 060928: RHESSI Spectral Fit
  30. IPN triangulation of GRB060928 (long, exceptionally bright)
  31. GRB 060930: near-IR afterglow candidate
  32. VLA observations of GRB 060926
  33. GRB061002 - SDSS Pre-Burst Observations
  34. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  35. GRB 061002: Swift detection of a burst
  36. GRB 060908: Detection of a possible host
  37. GRB 060923A: Probable host galaxy in the R-band
  38. GRB 060807: Detection of a possible host galaxy
  39. GRB 060923A: VLA K-band Observations
  40. GRB 060930: Xinglong TNT optical observations
  41. GRB 060929: Swift/UVOT Optical Observations
  42. GRB 060930: ROTSE-III Optical Limits
  43. GRB 060929: TNG K-band observations
  44. GRB 060929, Swift-BAT refined analysis
  45. GRB060929: Optical limit
  46. Liverpool Telescope observations of GRB 060929
  47. GRB060908: optical observations
  48. GRB 060927: Swift/UVOT Optical Observations
  49. GRB 060927 optical limit
  50. GRB 060927: Xinglong TNT optical observations
  51. GRB 060927, optical observation
  52. GRB 060926: MASTER: first minutes decay
  53. GRB060927 - SDSS Pre-Burst Observations
  54. GRB 060927: Swift detection of a burst
  55. GRB 060926: Swift-UVOT Detections
  56. GRB 060923A: Radio Observations
  57. GRB 060926: MASTER OT alert observation
  58. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  59. GRB 060923C: VLA Observation
  60. GRB 060923C: NIR afterglow confirmed
  61. GRB060923C: AROMA optical obsevation
  62. GRB 060923C, optical observation
  63. GRB 060923C: VLT J-band observations
  64. GRB 060923A: Keck and Gemini Observations
  65. GRB 060923C: Xinglong TNT optical observations
  66. GRB 060923C: Swift detection of a burst
  67. GRB 060923B: Swift detection of a burst
  68. GRB 060923, Swift-BAT refined analysis
  69. GRB 060923: Early Super-LOTIS Observations
  70. GRB 060923: UKIRT nIR observations - candidate afterglow
  71. GRB060923 - SDSS Pre-Burst Observations
  72. GRB 060923: Swift detection of a burst
  73. GRB 060919 : Faulkes South Telescope Observations
  74. GRB 060919, Swift-BAT refined analysis
  75. GRB 060919: TAROT optical observations
  76. GRB 060912A: VLA Observation
  77. GRB 060912A: Probable Host Galaxy
  78. GRB060912: OPTIMA-Burst optical observations
  79. GRB 060912: Correction to GCN 5559
  80. GRB060906: Danish/DFOSC optical observations
  81. VLA observations of GRB 060908
  82. GRB 060908 - SDSS Pre-burst Observations
  83. GRB 060908: REM optical prompt observation
  84. GRB 060908: Swift detection of a burst with a bright optical counterpart
  85. GRB 060904A: Suzaku/WAM observation of the prompt emission
  86. GRB060906 , optical observation
  87. GRB 060906: Early RAPTOR optical limits
  88. GRB 060906, Swift-BAT refined spectral analysis
  89. GRB 060906: Confirmation of P60 Optical Afterglow
  90. GRB 060906 (?): P60 Optical Afterglow Candidate
  91. GRB 060906: Swift detection of a probable burst
  92. GRB 060904A Milagro GeV/TeV Observations
  93. GRB060904b, optical observations
  94. GRB060904A: Swift/UVOT optical observations
  95. GRB 060904A: Subaru NIR observation
  96. GRB 060904B: Swift-BAT refined analysis
  97. Konus-Wind observation of GRB 060904A
  98. GRB 060904A: Refined analysis of the Swift-BAT burst
  99. GRB 060904A: Suzaku-XIS and -HXD observation plan
  100. GRB 060904A: P60 Observations

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