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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"

45628 results found.

  1. GRB 061007: Correction to GCN 5712
  2. GRB 061007: Swift-BAT refined analysis
  3. GRB 061007: Swift XRT refined analysis
  4. GRB 061006: Swift/UVOT optical observations
  5. Konus-Wind observation of the short hard GRB 061006
  6. GRB 061007 - FTS early brightening and power law decay
  7. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  8. GRB 061007: Swift detection of a burst with an optical counterpart
  9. GRB 061007: ROTSE-III Detection of Optical Counterpart
  10. GRB 061006: VLT observation
  11. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  12. GRB 061006: Swift-XRT Team Refined Analysis
  13. GRB061006 (Swift 232585) might be a short-hard GRB
  14. GRB 060930: near-IR afterglow candidate retraction
  15. GRB061006: Faulkes Telescope South Observations
  16. GRB 061006: Swift detection of a burst
  17. GRB 061004: Optical afterglow candidate and redshift
  18. GRB 061004: Las Campanas Optical/NIR Observations
  19. GRB061004: Swift/UVOT optical observations
  20. GRB 061004: Swift-XRT Team Refined Analysis
  21. GRB 061004, Swift BAT refined analysis
  22. GRB 061004: Nearby 2MASS Galaxy
  23. GRB 060928: Correction to GCN 5690
  24. GRB 061004: Swift detection of a burst
  25. GRB 060928: 2 pseudo-z from 2 detections spectral parameters
  26. Konus-Wind observation of GRB 060928
  27. GRB 060928: Suzaku/WAM observation of the prompt emission
  28. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  29. GRB 060928: Swift observations
  30. GRB 060928: RHESSI Spectral Fit
  31. IPN triangulation of GRB060928 (long, exceptionally bright)
  32. GRB061002: Swift UVOT followup observations
  33. GRB 060930: near-IR afterglow candidate
  34. GRB 061002: Swift-XRT Team Refined Analysis
  35. VLA observations of GRB 060926
  36. GRB061002 - SDSS Pre-Burst Observations
  37. GRB 061002, Swift-BAT refined analysis
  38. GRB061002: MASTER-VWF-Kislovodsk observations
  39. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  40. GRB 061002: Swift detection of a burst
  41. GRB 060908: Detection of a possible host
  42. GRB 060923A: Probable host galaxy in the R-band
  43. GRB 060807: Detection of a possible host galaxy
  44. GRB 060923A: VLA K-band Observations
  45. GRB060930: Faulkes Telescope South observation
  46. GRB 060930: Xinglong TNT optical observations
  47. GRB 060929: Further XRT Refined Analysis
  48. GRB 060929: Swift/UVOT Optical Observations
  49. GRB 060930: ROTSE-III Optical Limits
  50. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  51. GRB 060927 : GAO 150cm telescope optical observation
  52. GRB060929: Swift-XRT refined analysis.
  53. GRB 060929, Swift-BAT further refined analysis - late-time flare
  54. GRB 060929: TNG K-band observations
  55. GRB 060929, Swift-BAT refined analysis
  56. GRB060929: Optical limit
  57. GRB 060929: BART observation
  58. GRB 060929: MASTER-VWF-Kislovodsk observations
  59. GRB 060929: BOOTES-IR & OSN observations
  60. Liverpool Telescope observations of GRB 060929
  61. GRB 060929: Swift detection of a burst
  62. GRB060908: optical observations
  63. GRB 060729: An update on the late-time Swift observations
  64. GRB 060927: Spectroscopic redshift z=5.6
  65. IBAS Alert n.3501: not a GRB
  66. IBAS Alert n.3500: not a GRB
  67. GRB060923C: optical limit
  68. GRB060927: optical observations
  69. test of new software, grb
  70. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  71. GRB 060927: pseudo-z from spectral parameters of the prompt emission
  72. GRB 060927: Swift/UVOT Optical Observations
  73. GRB 060927: Early color
  74. GRB 060927: Swift XRT Team refined analysis
  75. GRB 060927 optical limit
  76. GRB 060927, Swift-BAT refined analysis
  77. GRB 060927: Xinglong TNT optical observations
  78. GRB060926: improved redshift
  79. GRB 060927, optical observation
  80. GRB 060927 : Kiso optical observation
  81. GRB060927: Faulkes Telescope South observation
  82. GRB 060926: MASTER: first minutes decay
  83. GRB060927 - SDSS Pre-Burst Observations
  84. GRB 060927: optical afterglow confirmation
  85. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  86. Swift XRT boresight
  87. GRB 060927: Swift detection of a burst
  88. GRB060926: VLT redshift
  89. GRB 060926: Swift-UVOT Detections
  90. GRB 060923A: Schedule of Spitzer Space Telescope Observations
  91. GRB 060926: OPTIMA-Burst -- further observations
  92. GRB 060926: Swift XRT refined analysis
  93. GRB 060926, Swift-BAT refined analysis
  94. GRB 060923A: Radio Observations
  95. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  96. GRB 060912A: Redshift of probable host galaxy
  97. GRB 060926: BOOTES-IR observations
  98. GRB 060926: Watcher observations
  99. GRB060926 OPTIMA-Burst optical observation
  100. GRB 060926: Swift detection of a burst

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