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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

36032 results found.

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

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