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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"

36343 results found.

  1. GRB060219: optical observation
  2. GRB060206: optical observation
  3. GRB060218/SN2006aj: optical observations
  4. GRB 060218/SN 2006aj, LNA optical observation
  5. GRB060218: Refined photometric calibration of comparison stars
  6. GRB 060319: WHT K-band candidate afterglow
  7. GRB 060319: IAC-80 optical observations
  8. GRB060319: Swift XRT refined analysis
  9. GRB 060319: Re-analysis of TNG data
  10. GRB060319: MASTER limit
  11. GRB 060319: Swift-BAT refined analysis
  12. GRB 060319 optical observations at TNG
  13. GRB060319 : Liverpool Telescope optical limit
  14. GRB060319: MASTER optical observation
  15. GRB060319 - SDSS Pre-burst Observations
  16. GRB 060319: Swift detection of a burst
  17. GRB060313: Radio Observations
  18. GRB 060313: early afterglow NIR upper limits with REM
  19. IBAS Alert n. 3221: not a GRB
  20. Konus-Wind observation of GRB 060313
  21. GRB060313: SSO 40inch Observations
  22. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  23. GRB 060313: PROMPT Observations
  24. GRB 060313: Swift/UVOT Observations
  25. GRB060313:Gemini South Observations
  26. GRB 060313: Swift-XRT team refined analysis
  27. GRB060313: optical observations of the afterglow candidate
  28. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  29. GRB 060313, SMARTS optical counterpart?
  30. GRB 060313: Possible optical counterpart
  31. GRB 060313: Swift XRT position
  32. GRB 060313, SMARTS optical/IR observations
  33. GRB060313: optical and near infrared observations with REM
  34. GRB 060313: Swift-BAT detection of a bright short hard burst
  35. GRB060218: SARA Observations of SN2006aj
  36. GRB 060312: Refined analysis of the Swift-BAT burst
  37. GRB 060218/SN 2006aj, high resolution spectra
  38. GRB 060312: Swift XRT team refined analysis
  39. GRB060306: APO Ks-band Imaging Observations
  40. GRB 060312: ROTSE-III Optical Limits
  41. GRB 060312: Swift detection of a burst
  42. IBAS Alert n. 3218 : not a real GRB
  43. GRB 060306: SOAR Ks Observations
  44. Bright short hard GRB 060303: IPN localization and Konus spectrum
  45. GRB 060306: MAGNUM observations
  46. GRB060218: analysis of the XMM-Newton observation
  47. Swift/UVOT observations of GRB060306
  48. GRB 060306: Swift-BAT refined analysis
  49. GRB 060306: Swift-XRT team refined analysis
  50. GRB 060306: PROMPT Observations
  51. GRB 060306: Swift detection of a bright burst
  52. GRB 060218: RTT150 optical observations
  53. GRB060223b: optical limit
  54. GRB060218/SN 2006aj: optical observation in V
  55. GRB060218/SN 2006aj: optical observation
  56. GRB 060121: HST observations
  57. GRB 060218 : GMRT observation [Correction and Improvement]
  58. GRB 060223b: Swift/UVOT Upper Limits
  59. GRB 060218/SN 2006aj: K-380 optical observations
  60. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  61. GRB 060223B: Swift XRT possible afterglow
  62. GRB 060218/SN 2006aj: ABT observations
  63. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  64. GRB 060218 : Radio upper limits from GMRT
  65. GRB 060218/SN 2006aj: WIRO optical observations
  66. GRB 060218/SN 2006aj: RBO optical observations
  67. GRB 060204B: GETS early limit
  68. GRB 060218: Refined analysis of the radio afterglow
  69. GRB 060223A:Xinglong optical limits
  70. GRB 060223B: ART optical limits
  71. GRB 060223B: Swift-BAT refined analysis
  72. GRB 060223a: Swift/UVOT refined analysis
  73. GRB 060223: Swift XRT Team preliminary analysis
  74. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  75. GRB 060223B: Swift detection of a bright burst
  76. GRB 060223: Swift-BAT refined analysis
  77. GRB 060218: rebrightening
  78. GRB 060218/SN 2006aj: optical observations
  79. GRB 060223: Keck redshift
  80. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  81. GRB 060223: Swift detection of a burst
  82. Spectral properties of GRB060218/SN2006aj
  83. GRB 060219: Swift-BAT refined analysis
  84. GRB 060218: rebrightening
  85. GRB 060218: emergence of the underlying SN spectrum
  86. GRB 060218: Decline in r-band flux
  87. GRB 060218: spectroscopic observations
  88. GRB 060218: Further refined analysis of the Swift-BAT burst
  89. GRB 060218: Likely an underluminous GRB
  90. GRB060218: Optical Spectroscopy of GRB-SN
  91. GRB060218: VLT spectroscopy
  92. GRB 060218: Optical Observations at Xinglong Obs.
  93. GRB 060219: SDSS galaxy inside XRT error circle
  94. GRB060218: UV Detection and Light Curves
  95. GRB060219: SARA Observations
  96. GRB 060219: Swift/UVOT Upper Limits
  97. GRB 060219: Swift-XRT Team refined analysis
  98. GRB 051221B: Swift-XRT Team Refined Analysis
  99. GRB 060219: Partial refined analysis of the Swift-BAT burst
  100. GRB060218: Radio Afterglow Discovery

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