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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"

35265 results found.

  1. GRB 060403: Refined analysis of the Swift-BAT burst
  2. GRB 060403: Swift detection of a burst
  3. GRB 060322: LNA optical limit
  4. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  5. GRB 060323 : WIDGET simultaneous optical observations
  6. GRB 060323: Early optical observation at Xinglong
  7. GRB060218, optical observations
  8. GRB 060322: Confirmation of Swift XRT afterglow
  9. GRB 060211A: optical observation
  10. GRB060323: optical limit
  11. GRB060211B: optical observation
  12. GRB060323: NOT optical observations
  13. GRB 060322: IAC80 optical observations
  14. GRB 060322: Swift XRT afterglow candidate
  15. GRB 060323: Swift/UVOT Observations
  16. GRB 060323: optical afterglow confirmed
  17. GRB060323: NOT observations
  18. GRB 060323: Optical Observations
  19. GRB 060323: Tautenburg OT candidate retraction
  20. GRB 060323: Refined analysis of the Swift-BAT burst
  21. GRB 060323: optical observations at TNG
  22. GRB 060323: Swift XRT refined analysis
  23. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  24. GRB 060323: Swift/XRT position
  25. GRB 060322: Refined analysis of the Swift-BAT burst
  26. GRB060323 - SDSS Pre-Burst Observations
  27. GRB 060323: Swift detection of a burst with a possible optical afterglow
  28. GRB 060322: Swift-BAT detection of a 200-sec burst
  29. GRB060219: optical observation
  30. GRB060206: optical observation
  31. GRB060218/SN2006aj: optical observations
  32. GRB 060218/SN 2006aj, LNA optical observation
  33. GRB060218: Refined photometric calibration of comparison stars
  34. GRB 060319: WHT K-band candidate afterglow
  35. GRB 060319: IAC-80 optical observations
  36. GRB060319: Swift XRT refined analysis
  37. GRB 060319: Re-analysis of TNG data
  38. GRB060319: MASTER limit
  39. GRB 060319: Swift-BAT refined analysis
  40. GRB 060319 optical observations at TNG
  41. GRB060319 : Liverpool Telescope optical limit
  42. GRB060319: MASTER optical observation
  43. GRB060319 - SDSS Pre-burst Observations
  44. GRB 060319: Swift detection of a burst
  45. GRB060313: Radio Observations
  46. GRB 060313: early afterglow NIR upper limits with REM
  47. IBAS Alert n. 3221: not a GRB
  48. Konus-Wind observation of GRB 060313
  49. GRB060313: SSO 40inch Observations
  50. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  51. GRB 060313: PROMPT Observations
  52. GRB 060313: Swift/UVOT Observations
  53. GRB060313:Gemini South Observations
  54. GRB 060313: Swift-XRT team refined analysis
  55. GRB060313: optical observations of the afterglow candidate
  56. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  57. GRB 060313, SMARTS optical counterpart?
  58. GRB 060313: Possible optical counterpart
  59. GRB 060313: Swift XRT position
  60. GRB 060313, SMARTS optical/IR observations
  61. GRB060313: optical and near infrared observations with REM
  62. GRB 060313: Swift-BAT detection of a bright short hard burst
  63. GRB060218: SARA Observations of SN2006aj
  64. GRB 060312: Refined analysis of the Swift-BAT burst
  65. GRB 060218/SN 2006aj, high resolution spectra
  66. GRB 060312: Swift XRT team refined analysis
  67. GRB060306: APO Ks-band Imaging Observations
  68. GRB 060312: ROTSE-III Optical Limits
  69. GRB 060312: Swift detection of a burst
  70. IBAS Alert n. 3218 : not a real GRB
  71. GRB 060306: SOAR Ks Observations
  72. Bright short hard GRB 060303: IPN localization and Konus spectrum
  73. GRB 060306: MAGNUM observations
  74. GRB060218: analysis of the XMM-Newton observation
  75. Swift/UVOT observations of GRB060306
  76. GRB 060306: Swift-BAT refined analysis
  77. GRB 060306: Swift-XRT team refined analysis
  78. GRB 060306: PROMPT Observations
  79. GRB 060306: Swift detection of a bright burst
  80. GRB 060218: RTT150 optical observations
  81. GRB060223b: optical limit
  82. GRB060218/SN 2006aj: optical observation in V
  83. GRB060218/SN 2006aj: optical observation
  84. GRB 060121: HST observations
  85. GRB 060218 : GMRT observation [Correction and Improvement]
  86. GRB 060223b: Swift/UVOT Upper Limits
  87. GRB 060218/SN 2006aj: K-380 optical observations
  88. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  89. GRB 060223B: Swift XRT possible afterglow
  90. GRB 060218/SN 2006aj: ABT observations
  91. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  92. GRB 060218 : Radio upper limits from GMRT
  93. GRB 060218/SN 2006aj: WIRO optical observations
  94. GRB 060218/SN 2006aj: RBO optical observations
  95. GRB 060204B: GETS early limit
  96. GRB 060218: Refined analysis of the radio afterglow
  97. GRB 060223A:Xinglong optical limits
  98. GRB 060223B: ART optical limits
  99. GRB 060223B: Swift-BAT refined analysis
  100. GRB 060223a: Swift/UVOT refined analysis

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