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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

42293 results found.

  1. GRB 060930: MARGE Optical Limits
  2. GRB 061019: Swift/UVOT upper limit
  3. GRB 061019: SMARTS afterglow confirmation
  4. GRB061019: Swift XRT refined analysis
  5. GRB 061019: TAROT La Silla observatory optical observations
  6. GRB 061019: REM K-band candidate afterglow
  7. GRB061019: Swift/XRT position
  8. GRB 061019: Swift-BAT detection of a burst
  9. GRB 060825: GORT Observations
  10. GRB 061007: Second Epoch ATCA Radio Observations
  11. GRB 061007: RHESSI Spectral Fit
  12. GRB 061007: Suzaku/WAM observation of the prompt emission
  13. GRB 061006: astrometry-corrected XRT position
  14. Konus-Wind observation of GRB 061007
  15. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  16. GRB 061007: ATCA Radio Observations
  17. GRB061007: Swift UVOT followup observations
  18. GRB 061006: optical afterglow
  19. GRB 061006 : Suzaku/WAM observation of the prompt emission
  20. GRB 061007: OA fading and VLT redshift
  21. GRB 061007: Magellan Spectroscopy
  22. GRB 061007: Correction to GCN 5712
  23. GRB 061007: Swift-BAT refined analysis
  24. GRB 061007: Swift XRT refined analysis
  25. GRB 061006: Swift/UVOT optical observations
  26. Konus-Wind observation of the short hard GRB 061006
  27. GRB 061007 - FTS early brightening and power law decay
  28. GRB 061007: Swift detection of a burst with an optical counterpart
  29. GRB 061007: ROTSE-III Detection of Optical Counterpart
  30. GRB 061006: VLT observation
  31. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  32. GRB 061006: Swift-XRT Team Refined Analysis
  33. GRB061006 (Swift 232585) might be a short-hard GRB
  34. GRB 060930: near-IR afterglow candidate retraction
  35. GRB061006: Faulkes Telescope South Observations
  36. GRB 061006: Swift detection of a burst
  37. GRB 061004: Optical afterglow candidate and redshift
  38. GRB 061004: Las Campanas Optical/NIR Observations
  39. GRB061004: Swift/UVOT optical observations
  40. GRB 061004: Swift-XRT Team Refined Analysis
  41. GRB 060928: Correction to GCN 5690
  42. GRB 061004: Swift detection of a burst
  43. GRB 060928: 2 pseudo-z from 2 detections spectral parameters
  44. Konus-Wind observation of GRB 060928
  45. GRB 060928: Suzaku/WAM observation of the prompt emission
  46. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  47. GRB 060928: Swift observations
  48. GRB 060928: RHESSI Spectral Fit
  49. GRB 060930: near-IR afterglow candidate
  50. GRB 061002: Swift-XRT Team Refined Analysis
  51. GRB061002 - SDSS Pre-Burst Observations
  52. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  53. GRB 061002: Swift detection of a burst
  54. GRB 060908: Detection of a possible host
  55. GRB 060923A: Probable host galaxy in the R-band
  56. GRB 060807: Detection of a possible host galaxy
  57. GRB060930: Faulkes Telescope South observation
  58. GRB 060930: Xinglong TNT optical observations
  59. GRB 060929: Further XRT Refined Analysis
  60. GRB 060929: Swift/UVOT Optical Observations
  61. GRB 060930: ROTSE-III Optical Limits
  62. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  63. GRB 060927 : GAO 150cm telescope optical observation
  64. GRB060929: Swift-XRT refined analysis.
  65. GRB 060929: TNG K-band observations
  66. GRB060929: Optical limit
  67. GRB 060929: BART observation
  68. GRB 060929: BOOTES-IR & OSN observations
  69. Liverpool Telescope observations of GRB 060929
  70. GRB 060929: Swift detection of a burst
  71. GRB060908: optical observations
  72. GRB 060729: An update on the late-time Swift observations
  73. GRB 060927: Spectroscopic redshift z=5.6
  74. GRB060923C: optical limit
  75. GRB060927: optical observations
  76. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  77. GRB 060927: Swift/UVOT Optical Observations
  78. GRB 060927: Early color
  79. GRB 060927: Swift XRT Team refined analysis
  80. GRB 060927 optical limit
  81. GRB 060927, Swift-BAT refined analysis
  82. GRB 060927: Xinglong TNT optical observations
  83. GRB 060927, optical observation
  84. GRB 060927 : Kiso optical observation
  85. GRB060927: Faulkes Telescope South observation
  86. GRB 060926: MASTER: first minutes decay
  87. GRB060927 - SDSS Pre-Burst Observations
  88. GRB 060927: optical afterglow confirmation
  89. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  90. Swift XRT boresight
  91. GRB 060927: Swift detection of a burst
  92. GRB060926: VLT redshift
  93. GRB 060926: Swift-UVOT Detections
  94. GRB 060923A: Schedule of Spitzer Space Telescope Observations
  95. GRB 060926: OPTIMA-Burst -- further observations
  96. GRB 060926: Swift XRT refined analysis
  97. GRB 060926: MASTER OT alert observation
  98. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  99. GRB 060912A: Redshift of probable host galaxy
  100. GRB 060926: BOOTES-IR observations

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