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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"

15273 results found.

  1. Konus-Wind observation of GRB 061201
  2. GRB061202: Swift/UVOT Upper Limits
  3. GRB 061201: Swift XRT Team refined analysis
  4. GRB 061201: VLT optical observations
  5. GRB 061201: Swift detection of a short hard burst
  6. INT+WFC observations of GRB 061126
  7. GRB 061126: Possible Jet Break
  8. Swift XRT on-board boresight update
  9. GRB061121: optical observations
  10. GRB 061126: Early Super-LOTIS Observations
  11. GRB061126: Optical afterglow observations from MIRO
  12. GRB061126: Optical afterglow observations from MIRO
  13. GRB 061126 : SDSS Pre-Burst Observations
  14. GRB 061126: Swift/UVOT Observations
  15. GRB 061122: Confirmation of X-ray/Optical Afterglow
  16. GRB 061121: Ep,i - Eiso correlation
  17. GRB 061121: MDM Optical Decay
  18. GRB061121: P60 Observations
  19. GRB061122: Swift-XRT position
  20. Konus-Wind observation of GRB 061122
  21. Konus-Wind and Konus-A observations of GRB 061121
  22. INTEGRAL results on GRB 061122
  23. GRB 061121, Swift-BAT refined analysis
  24. GRB061121, optical observation
  25. GRB 061121: Optical observation at the KANATA 1.5m telescope
  26. GRB 050915B: optical afterglow
  27. GRB 060111B: Swift UVOT Refined Magnitudes
  28. GRB061110A: Correction to GCN5817
  29. GRB 061110A: refined R-band analysis
  30. Swift/UVOT Upper Limits for GRB061110b
  31. Swift/UVOT Upper Limits for GRB061110a
  32. GRB 061110B: Swift XRT refined analysis
  33. GRB 061110B: NOT optical observations
  34. GRB 061110: NOT observations
  35. GRB 061027: TAROT La Silla observatory optical observations
  36. GRB 061028: Swift/XRT Astrometry Correction
  37. GRB 061004: Further VLT/NTT observations
  38. GRB061102B: Super-LOTIS observations
  39. GRB 061004: Swift/XRT Astrometry Correction
  40. GRB 060801: Swift/XRT Astrometry Correction
  41. GRB 061028: MDM Observations
  42. GRB061025: ROTSE-III Confirmation of Optical Counterpart
  43. GRB061025: Swift/UVOT observations
  44. GRB 061025: REM observations
  45. GRB 061025: a long GRB detected by INTEGRAL
  46. Swift XRT boresight update
  47. Konus-Wind observation of GRB 061021
  48. GRB 061021 - VLT spectrum without lines
  49. GRB 061019: Super-LOTIS upper limit
  50. GRB 061019: dust-scattered X-ray halo detected in Swift/XRT
  51. GRB 061019: SMARTS afterglow confirmation
  52. GRB061019: Swift XRT refined analysis
  53. GRB061019: Swift/XRT position
  54. GRB 061007: Suzaku/WAM observation of the prompt emission
  55. GRB 061006: astrometry-corrected XRT position
  56. Konus-Wind observation of GRB 061007
  57. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  58. GRB061007: Swift UVOT followup observations
  59. GRB 061006: optical afterglow
  60. GRB 061006 : Suzaku/WAM observation of the prompt emission
  61. GRB 061007: Magellan Spectroscopy
  62. Konus-Wind observation of the short hard GRB 061006
  63. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  64. GRB 061006: Swift-XRT Team Refined Analysis
  65. GRB 060930: near-IR afterglow candidate retraction
  66. Konus-Wind observation of GRB 060928
  67. GRB 060928: Suzaku/WAM observation of the prompt emission
  68. GRB 060928: Swift observations
  69. IPN triangulation of GRB060928 (long, exceptionally bright)
  70. GRB061002 - SDSS Pre-Burst Observations
  71. GRB 060807: Detection of a possible host galaxy
  72. GRB 060930: Xinglong TNT optical observations
  73. GRB 060929: Further XRT Refined Analysis
  74. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  75. GRB 060729: An update on the late-time Swift observations
  76. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  77. GRB 060927: Early color
  78. GRB 060927: Swift XRT Team refined analysis
  79. GRB 060927 optical limit
  80. GRB 060927, optical observation
  81. GRB060927 - SDSS Pre-Burst Observations
  82. GRB 060927: optical afterglow confirmation
  83. GRB 060927: Swift detection of a burst
  84. GRB 060923C, Swift-BAT refined analysis
  85. GRB 060923C: Gemini Observations and Afterglow Candidate
  86. GRB 060923C, optical observation
  87. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  88. GRB 060923C: VLT J-band observations
  89. GRB 060923C: Swift XRT refined analysis
  90. GRB 060923A: Swift XRT refined analysis
  91. GRB 060923C: Keck Observations
  92. GRB 060923A: Keck and Gemini Observations
  93. GRB 060923: Early Super-LOTIS Observations
  94. GRB 060923: UKIRT nIR observations - candidate afterglow
  95. GRB060923 - SDSS Pre-Burst Observations
  96. GRB 060923: KAIT observations
  97. Konus-Wind observation of GRB 060912
  98. GRB 060912: Redshift of nearby 2MASS galaxy
  99. GRB060912: OPTIMA-Burst optical observations
  100. GRB060906: Danish/DFOSC optical observations

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