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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"

36147 results found.

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

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