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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"

28124 results found.

  1. GRB 061028: Futher P200 Observations
  2. GRB 061028: MDM Observations
  3. GRB 061028: P200 Observations
  4. GRB 061028: SARA upper limit
  5. GRB 061028: z band imaging
  6. GRB061028: XRT refined analysis
  7. GRB 061028: Swift/UVOT Observations
  8. GRB 061028: TAROT Calern observatory late optical observations
  9. GRB 061028: Swift detection of a burst
  10. GRB 061027, Swift refined analysis of a possible burst
  11. GRB 061027: Swift detection of a possible burst
  12. GRB061025: ROTSE-III Confirmation of Optical Counterpart
  13. GRB061025: Swift XRT refined analysis
  14. GRB061025: Swift/UVOT observations
  15. GRB 061019: MITSuME upper limits
  16. GRB 061025: REM observations
  17. GRB 061025: Gemini-S observations
  18. GRB061025: Swift XRT position
  19. Swift XRT boresight update
  20. GRB 061021: Swift-XRT refined analysis
  21. GRB 061021: Swift detection of a burst
  22. GRB 061019: Super-LOTIS upper limit
  23. GRB060904b: optical observations
  24. GRB061019: optical observations
  25. GRB061019: optical observations
  26. GRB 061019: dust-scattered X-ray halo detected in Swift/XRT
  27. GRB 061019: Swift/UVOT upper limit
  28. GRB 061019: SMARTS afterglow confirmation
  29. GRB061019: Swift XRT refined analysis
  30. GRB 061019: TAROT La Silla observatory optical observations
  31. GRB 061019: REM K-band candidate afterglow
  32. GRB061019: Swift/XRT position
  33. GRB 061019: Swift-BAT detection of a burst
  34. GRB 060825: GORT Observations
  35. GRB 061007: Second Epoch ATCA Radio Observations
  36. GRB 061006: astrometry-corrected XRT position
  37. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  38. GRB 061007: ATCA Radio Observations
  39. GRB061007: Swift UVOT followup observations
  40. GRB 061006: optical afterglow
  41. GRB 061007: OA fading and VLT redshift
  42. GRB 061007: Magellan Spectroscopy
  43. GRB 061007: Correction to GCN 5712
  44. GRB 061007: Swift-BAT refined analysis
  45. GRB 061007: Swift XRT refined analysis
  46. GRB 061006: Swift/UVOT optical observations
  47. GRB 061007 - FTS early brightening and power law decay
  48. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  49. GRB 061007: Swift detection of a burst with an optical counterpart
  50. GRB 061007: ROTSE-III Detection of Optical Counterpart
  51. GRB 061006: VLT observation
  52. GRB 061006: Swift-XRT Team Refined Analysis
  53. GRB061006 (Swift 232585) might be a short-hard GRB
  54. GRB 060930: near-IR afterglow candidate retraction
  55. GRB061006: Faulkes Telescope South Observations
  56. GRB 061006: Swift detection of a burst
  57. GRB 061004: Optical afterglow candidate and redshift
  58. GRB 061004: Las Campanas Optical/NIR Observations
  59. GRB061004: Swift/UVOT optical observations
  60. GRB 061004: Swift-XRT Team Refined Analysis
  61. GRB 061004: Nearby 2MASS Galaxy
  62. GRB 061004: Swift detection of a burst
  63. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  64. GRB 060928: Swift observations
  65. IPN triangulation of GRB060928 (long, exceptionally bright)
  66. GRB061002: Swift UVOT followup observations
  67. GRB 060930: near-IR afterglow candidate
  68. GRB 061002: Swift-XRT Team Refined Analysis
  69. VLA observations of GRB 060926
  70. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  71. GRB 061002: Swift detection of a burst
  72. GRB 060908: Detection of a possible host
  73. GRB 060923A: Probable host galaxy in the R-band
  74. GRB 060807: Detection of a possible host galaxy
  75. GRB 060923A: VLA K-band Observations
  76. GRB 060929: Further XRT Refined Analysis
  77. GRB 060929: Swift/UVOT Optical Observations
  78. GRB 060927 : GAO 150cm telescope optical observation
  79. GRB060929: Swift-XRT refined analysis.
  80. GRB 060929: TNG K-band observations
  81. GRB060929: Optical limit
  82. Liverpool Telescope observations of GRB 060929
  83. GRB 060929: Swift detection of a burst
  84. GRB060908: optical observations
  85. GRB 060729: An update on the late-time Swift observations
  86. GRB 060927: Spectroscopic redshift z=5.6
  87. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  88. GRB 060927: Swift/UVOT Optical Observations
  89. GRB 060927: Early color
  90. GRB 060927: Swift XRT Team refined analysis
  91. GRB 060927: Xinglong TNT optical observations
  92. GRB060926: improved redshift
  93. GRB 060927: Possible host galaxy (star?) in the SDSS
  94. GRB 060927 : Kiso optical observation
  95. GRB060927: Faulkes Telescope South observation
  96. GRB 060927: optical afterglow confirmation
  97. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  98. Swift XRT boresight
  99. GRB 060927: Swift detection of a burst
  100. GRB060926: VLT redshift

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