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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"

39322 results found.

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

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