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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"

36008 results found.

  1. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  2. An interactive program for GRB pseudo-redshift computations
  3. GRB060424: optical afterglow detection
  4. GRB060418: Further Analysis of MIKE Spectroscopy
  5. GRB 060424: Refined analysis of the Swift-BAT burst
  6. GRB 060424: Swift detection of a burst
  7. GRB 060421: TTT Observations
  8. GRB 060421: Swift-BAT Refined Analysis
  9. GRB 060421: Swift-XRT refined analysis
  10. GRB 060418: prediction of t_break
  11. GRB060418: optical observations
  12. Konus-Wind observation of GRB 060418
  13. GRB(?)060421:MASTER optical limit
  14. GRB(?)060421 : XRT position
  15. GRB(?) 060421: Swift detection of a burst
  16. Erratum of GCN 4983 for GRB 060418 IR follow-up
  17. GRB 060418 : IR afterglow observations
  18. GRB 060418 : Lulin Optical follow-up
  19. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  20. GRB 060418: Radio Observations
  21. GRB060418, BVRcIc field calibration
  22. GRB060418: Optical Observations
  23. GRB 060418: FRAM early afterglow observation
  24. GRB 060418: Refined Analysis of the Swift-BAT burst
  25. GRB060418: Swift XRT Team Refined Analysis
  26. GRB 060418, SMARTS continuing afterglow observations
  27. GRB 060418: PROMPT Detections
  28. GRB 060418, SMARTS optical/IR afterglow observations
  29. GRB060418: Magellan/MIKE Spectroscopic Redshift
  30. GRB060418 : LT optical afterglow observation
  31. GRB 060418: REM candidate afterglow
  32. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  33. GRB 060413: REM NIR Observations
  34. GRB 060413: Refined analysis of the Swift-BAT burst
  35. GRB 060413: Watcher UBVR observations
  36. GRB 060413: XRT refined analysis
  37. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  38. GRB 060413: Swift detection of a burst
  39. GRB060403: optical observations
  40. GRB 060403 Optical observations
  41. GRB 060403: MITSuME optical observation
  42. GRB060403: XRT refined analysis
  43. GRB 060403: Swift/UVOT upper limits
  44. GRB 060403: Refined analysis of the Swift-BAT burst
  45. GRB 060403: Swift detection of a burst
  46. GRB 060322: LNA optical limit
  47. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  48. GRB 060323 : WIDGET simultaneous optical observations
  49. GRB 060323: Early optical observation at Xinglong
  50. GRB060218, optical observations
  51. GRB 060322: Confirmation of Swift XRT afterglow
  52. GRB 060211A: optical observation
  53. GRB060323: optical limit
  54. GRB060211B: optical observation
  55. GRB060323: NOT optical observations
  56. GRB 060322: IAC80 optical observations
  57. GRB 060322: Swift XRT afterglow candidate
  58. GRB 060323: Swift/UVOT Observations
  59. GRB 060323: optical afterglow confirmed
  60. GRB060323: NOT observations
  61. GRB 060323: Optical Observations
  62. GRB 060323: Tautenburg OT candidate retraction
  63. GRB 060323: Refined analysis of the Swift-BAT burst
  64. GRB 060323: optical observations at TNG
  65. GRB 060323: Swift XRT refined analysis
  66. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  67. GRB 060323: Swift/XRT position
  68. GRB 060322: Refined analysis of the Swift-BAT burst
  69. GRB060323 - SDSS Pre-Burst Observations
  70. GRB 060323: Swift detection of a burst with a possible optical afterglow
  71. GRB 060322: Swift-BAT detection of a 200-sec burst
  72. GRB060219: optical observation
  73. GRB060206: optical observation
  74. GRB060218/SN2006aj: optical observations
  75. GRB 060218/SN 2006aj, LNA optical observation
  76. GRB060218: Refined photometric calibration of comparison stars
  77. GRB 060319: WHT K-band candidate afterglow
  78. GRB 060319: IAC-80 optical observations
  79. GRB060319: Swift XRT refined analysis
  80. GRB 060319: Re-analysis of TNG data
  81. GRB060319: MASTER limit
  82. GRB 060319: Swift-BAT refined analysis
  83. GRB 060319 optical observations at TNG
  84. GRB060319 : Liverpool Telescope optical limit
  85. GRB060319: MASTER optical observation
  86. GRB060319 - SDSS Pre-burst Observations
  87. GRB 060319: Swift detection of a burst
  88. GRB060313: Radio Observations
  89. GRB 060313: early afterglow NIR upper limits with REM
  90. IBAS Alert n. 3221: not a GRB
  91. Konus-Wind observation of GRB 060313
  92. GRB060313: SSO 40inch Observations
  93. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  94. GRB 060313: PROMPT Observations
  95. GRB 060313: Swift/UVOT Observations
  96. GRB060313:Gemini South Observations
  97. GRB 060313: Swift-XRT team refined analysis
  98. GRB060313: optical observations of the afterglow candidate
  99. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  100. GRB 060313, SMARTS optical counterpart?

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