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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"

42908 results found.

  1. GRB 060323: Swift/XRT position
  2. GRB 060322: Refined analysis of the Swift-BAT burst
  3. GRB060323 - SDSS Pre-Burst Observations
  4. GRB 060323: Swift detection of a burst with a possible optical afterglow
  5. GRB 060322: Swift-BAT detection of a 200-sec burst
  6. GRB060219: optical observation
  7. GRB060206: optical observation
  8. GRB060218/SN2006aj: optical observations
  9. GRB 060218/SN 2006aj, LNA optical observation
  10. GRB060218: Refined photometric calibration of comparison stars
  11. GRB 060319: WHT K-band candidate afterglow
  12. GRB 060319: IAC-80 optical observations
  13. GRB060319: Swift XRT refined analysis
  14. GRB060319: MASTER limit
  15. GRB 060319: Swift-BAT refined analysis
  16. GRB060319 : Liverpool Telescope optical limit
  17. GRB060319: MASTER optical observation
  18. GRB060319 - SDSS Pre-burst Observations
  19. GRB060319: Swift/XRT position
  20. GRB 060319: Swift detection of a burst
  21. GRB060313: Radio Observations
  22. GRB 060313: early afterglow NIR upper limits with REM
  23. IBAS Alert n. 3221: not a GRB
  24. Konus-Wind observation of GRB 060313
  25. GRB060313: SSO 40inch Observations
  26. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  27. GRB 060313: PROMPT Observations
  28. GRB 060313: Swift/UVOT Observations
  29. GRB060313:Gemini South Observations
  30. GRB 060313: Swift-XRT team refined analysis
  31. GRB060313: optical observations of the afterglow candidate
  32. GRB 060313, SMARTS optical counterpart?
  33. GRB 060313: Possible optical counterpart
  34. GRB 060313, SMARTS optical/IR observations
  35. GRB060313: optical and near infrared observations with REM
  36. GRB 060313: Swift-BAT detection of a bright short hard burst
  37. GRB060218: SARA Observations of SN2006aj
  38. GRB060312: Swift UVOT observation
  39. GRB 060312: Refined analysis of the Swift-BAT burst
  40. GRB 060218/SN 2006aj, high resolution spectra
  41. GRB 060312: Swift XRT team refined analysis
  42. GRB060306: APO Ks-band Imaging Observations
  43. GRB 060312: ROTSE-III Optical Limits
  44. GRB 060312: Swift detection of a burst
  45. IBAS Alert n. 3218 : not a real GRB
  46. GRB 060306: SOAR Ks Observations
  47. Bright short hard GRB 060303: IPN localization and Konus spectrum
  48. GRB060219: Liverpool Telescope observations
  49. GRB 060306: MAGNUM observations
  50. GRB060218: analysis of the XMM-Newton observation
  51. GRB 060306: Swift-BAT refined analysis
  52. GRB 060306: Swift-XRT team refined analysis
  53. GRB 060306: PROMPT Observations
  54. GRB 060306: Swift detection of a bright burst
  55. GRB 060218: RTT150 optical observations
  56. GRB060218: Ep,i - Eiso correlation
  57. GRB060223b: optical limit
  58. GRB060218/SN 2006aj: optical observation in V
  59. GRB060218/SN 2006aj: optical observation
  60. GRB 060121: HST observations
  61. GRB 060218 : GMRT observation [Correction and Improvement]
  62. GRB 060218/SN 2006aj: K-380 optical observations
  63. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  64. GRB200618: optical polarimetry and photometry
  65. GRB 060223B: Swift XRT possible afterglow
  66. GRB 060218/SN 2006aj: ABT observations
  67. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  68. GRB 060218 : Radio upper limits from GMRT
  69. GRB 060218/SN 2006aj: RBO optical observations
  70. GRB 060204B: GETS early limit
  71. GRB 060218: Refined analysis of the radio afterglow
  72. GRB 060223A:Xinglong optical limits
  73. GRB 060223B: ART optical limits
  74. GRB 060223B: Swift-BAT refined analysis
  75. GRB 060223a: Swift/UVOT refined analysis
  76. GRB 060223: Swift XRT Team preliminary analysis
  77. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  78. GRB 060223B: Swift detection of a bright burst
  79. GRB 060218: rebrightening
  80. Correction to GCN 4816 on GRB060218
  81. GRB 060218/SN 2006aj: optical observations
  82. GRB060218: Optical brightening in V and R
  83. GRB 060223: Keck redshift
  84. GRB 060223: Swift detection of a burst
  85. Spectral properties of GRB060218/SN2006aj
  86. GRB 060219: Swift-BAT refined analysis
  87. GRB 060218: rebrightening
  88. GRB 060218: emergence of the underlying SN spectrum
  89. GRB 060218: Decline in r-band flux
  90. GRB 060218: spectroscopic observations
  91. GRB 060218: Further refined analysis of the Swift-BAT burst
  92. GRB 060218: Likely an underluminous GRB
  93. GRB060218: Optical Spectroscopy of GRB-SN
  94. GRB060218: VLT spectroscopy
  95. GRB 060218: Optical Observations at Xinglong Obs.
  96. GRB 060219: SDSS galaxy inside XRT error circle
  97. GRB060218: UV Detection and Light Curves
  98. GRB060219: SARA Observations
  99. GRB 060219: Swift-XRT Team refined analysis
  100. GRB 051221B: Swift-XRT Team Refined Analysis

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