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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"

35995 results found.

  1. GRB(?)060421 : XRT position
  2. GRB(?) 060421: Swift detection of a burst
  3. Erratum of GCN 4983 for GRB 060418 IR follow-up
  4. GRB 060418 : IR afterglow observations
  5. GRB 060418 : Lulin Optical follow-up
  6. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  7. GRB 060418: Radio Observations
  8. GRB060418, BVRcIc field calibration
  9. GRB060418: Optical Observations
  10. GRB 060418: FRAM early afterglow observation
  11. GRB 060418: Refined Analysis of the Swift-BAT burst
  12. GRB060418: Swift XRT Team Refined Analysis
  13. GRB 060418, SMARTS continuing afterglow observations
  14. GRB 060418: PROMPT Detections
  15. GRB 060418, SMARTS optical/IR afterglow observations
  16. GRB060418: Magellan/MIKE Spectroscopic Redshift
  17. GRB060418 : LT optical afterglow observation
  18. GRB 060418: REM candidate afterglow
  19. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  20. GRB 060413: REM NIR Observations
  21. GRB 060413: Refined analysis of the Swift-BAT burst
  22. GRB 060413: Watcher UBVR observations
  23. GRB 060413: XRT refined analysis
  24. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  25. GRB 060413: Swift detection of a burst
  26. GRB060403: optical observations
  27. GRB 060403 Optical observations
  28. GRB 060403: MITSuME optical observation
  29. GRB060403: XRT refined analysis
  30. GRB 060403: Swift/UVOT upper limits
  31. GRB 060403: Refined analysis of the Swift-BAT burst
  32. GRB 060403: Swift detection of a burst
  33. GRB 060322: LNA optical limit
  34. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  35. GRB 060323 : WIDGET simultaneous optical observations
  36. GRB 060323: Early optical observation at Xinglong
  37. GRB060218, optical observations
  38. GRB 060322: Confirmation of Swift XRT afterglow
  39. GRB 060211A: optical observation
  40. GRB060323: optical limit
  41. GRB060211B: optical observation
  42. GRB060323: NOT optical observations
  43. GRB 060322: IAC80 optical observations
  44. GRB 060322: Swift XRT afterglow candidate
  45. GRB 060323: Swift/UVOT Observations
  46. GRB 060323: optical afterglow confirmed
  47. GRB060323: NOT observations
  48. GRB 060323: Optical Observations
  49. GRB 060323: Tautenburg OT candidate retraction
  50. GRB 060323: Refined analysis of the Swift-BAT burst
  51. GRB 060323: optical observations at TNG
  52. GRB 060323: Swift XRT refined analysis
  53. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  54. GRB 060323: Swift/XRT position
  55. GRB 060322: Refined analysis of the Swift-BAT burst
  56. GRB060323 - SDSS Pre-Burst Observations
  57. GRB 060323: Swift detection of a burst with a possible optical afterglow
  58. GRB 060322: Swift-BAT detection of a 200-sec burst
  59. GRB060219: optical observation
  60. GRB060206: optical observation
  61. GRB060218/SN2006aj: optical observations
  62. GRB 060218/SN 2006aj, LNA optical observation
  63. GRB060218: Refined photometric calibration of comparison stars
  64. GRB 060319: WHT K-band candidate afterglow
  65. GRB 060319: IAC-80 optical observations
  66. GRB060319: Swift XRT refined analysis
  67. GRB 060319: Re-analysis of TNG data
  68. GRB060319: MASTER limit
  69. GRB 060319: Swift-BAT refined analysis
  70. GRB 060319 optical observations at TNG
  71. GRB060319 : Liverpool Telescope optical limit
  72. GRB060319: MASTER optical observation
  73. GRB060319 - SDSS Pre-burst Observations
  74. GRB 060319: Swift detection of a burst
  75. GRB060313: Radio Observations
  76. GRB 060313: early afterglow NIR upper limits with REM
  77. IBAS Alert n. 3221: not a GRB
  78. Konus-Wind observation of GRB 060313
  79. GRB060313: SSO 40inch Observations
  80. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  81. GRB 060313: PROMPT Observations
  82. GRB 060313: Swift/UVOT Observations
  83. GRB060313:Gemini South Observations
  84. GRB 060313: Swift-XRT team refined analysis
  85. GRB060313: optical observations of the afterglow candidate
  86. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  87. GRB 060313, SMARTS optical counterpart?
  88. GRB 060313: Possible optical counterpart
  89. GRB 060313: Swift XRT position
  90. GRB 060313, SMARTS optical/IR observations
  91. GRB060313: optical and near infrared observations with REM
  92. GRB 060313: Swift-BAT detection of a bright short hard burst
  93. GRB060218: SARA Observations of SN2006aj
  94. GRB 060312: Refined analysis of the Swift-BAT burst
  95. GRB 060218/SN 2006aj, high resolution spectra
  96. GRB 060312: Swift XRT team refined analysis
  97. GRB060306: APO Ks-band Imaging Observations
  98. GRB 060312: ROTSE-III Optical Limits
  99. GRB 060312: Swift detection of a burst
  100. IBAS Alert n. 3218 : not a real GRB

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