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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"

26342 results found.

  1. GRB050714b: Radio Observation
  2. GRB050712: Radio Observations
  3. GRB050713a: Radio Observation
  4. GRB 050712, Tautenburg optical afterglow observations
  5. Swift-BAT detection of a possible GRB
  6. GRB 050714B: VLT R-band observations
  7. GRB 050717: Additional LCO observations
  8. GRB 050716; J-band observations
  9. GRB 050717: LCO near-IR observations
  10. Swift/UVOT Observations of GRB 050717
  11. GRB 050717: Swift-BAT refined analysis
  12. GRB050717: Swift XRT position
  13. Swift detection of GRB 050717
  14. Swift UVOT Observations of GRB 050716
  15. GRB 050716: Refined XRT analysis.
  16. GRB050716: Refined analysis of the Swift-BAT burst
  17. GRB 050716: Lulin B and R band optical observations
  18. GRB050716, optical observation
  19. GRB050716: Faulkes North Telescope observation
  20. GRB050715: Refined analysis of the Swift-BAT burst
  21. GRB 050715: Swift-BAT detection
  22. GRB 050713b: RTT150 optical observations
  23. GRB050714B: Refined analysis of the Swift-BAT burst
  24. GRB 050714B: optical afterglow
  25. GRB 050714, R-band candidate
  26. GRB 050714, optical observations
  27. GRB 050713A: XRT refined analysis
  28. GRB 050713A: RAPTOR detection of early optical emission
  29. GRB050713B :Swift/UVOT observations
  30. GRB050713b: XRT refined analysis
  31. GRB050712: TNG R-band observations
  32. GRB 050713B: Swift-BAT Refined Analysis
  33. GRB 050713A: Swift/UVOT observation
  34. GRB 050713A : Swift-BAT Refined Analysis
  35. GRB050712: Swift UVOT Observation of Afterglow Emission
  36. GRB 050713A : Lulin R-band observation
  37. GRB 050713A XMM-Newton observation
  38. GRB 050713b : Lulin R-band observations
  39. GRB050713B: Faulkes North Telescope observation
  40. RBO RI observations of GRB 050713A
  41. GRB 050713B
  42. GRB050709 : Chandra source optical counterpart
  43. GRB050713: Liverpool Telescope prompt observations
  44. GRB 050712, optical observations
  45. GRB050709: Candidate X-ray Afterglow from Chandra
  46. GRB050713: possible I-band afterglow
  47. GRB050712: XRT refined analysis
  48. GRB050709: Radio Observations
  49. GRB 050709: Swift UVOT and XRT observations
  50. GRB 050712: Swift-BAT Refined Analysis
  51. GRB050712: UVOT candidate optical counterpart
  52. GRB 050709: LCO40 Observations
  53. GRB050709, optical observations
  54. PROMPT Rc Observations of GRB 050709
  55. GRB 050525a: PROMPT VRcIc Detections
  56. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  57. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  58. GRB 050626: Swift XRT observations
  59. GRB 050408: ARC 3.5-meter NIR Observations
  60. GRB 050701: Refined XRT analysis
  61. Swift UVOT observations of GRB 050701
  62. GRB050701: Swift-BAT Refined analysis
  63. Swift trigger 143708 is really GRB 050701
  64. GRB 050607, radio observations
  65. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  66. GRB050525a: HST Observations
  67. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  68. XRF 050509c: Optical monitoring
  69. Konus-Wind observation of an intermediate burst from SGR 1806-20
  70. XRF050509c: Radio Detection
  71. GRB 050607 optical decay
  72. GRB050607: refined analysis of prompt REM observations
  73. GRB 050607: PROMPT VRcIc Observations
  74. GRB 050607: Optical decay and spectral slope
  75. GRB050607,optical observation
  76. Optical Afterglow of GRB 050607
  77. GRB050607: Swift Detection of a long GRB
  78. GRB050607: prompt REM observations
  79. Limits on a SN in the field of GRB 050509b
  80. GRB 050603 - XRT data analysis of the first day
  81. GRB050603, submillimetre observations
  82. GRB050603: Radio Detection
  83. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  84. GRB 050603: INTEGRAL shows it is not a short GRB
  85. GRB 050525a, infrared observations
  86. GRB050528, XRT observations
  87. GRB050528: updated Liverpool Telescope limits
  88. Swift-BAT GRB 050528: a soft burst
  89. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  90. Possible GRB050528: no candidate from Liverpool Telescope
  91. GRB050525a: Radio Observations
  92. GRB 050509b: refined XRT/Chandra afterglow position analysis
  93. GRB 050525: RTT150, Optical observations
  94. GRB 050525a: SARA Observations
  95. GRB 050525B: Swift-BAT observations
  96. GRB 050525: MITSuME Optical Observation in VRI
  97. GRB050525A,optical observation
  98. GRB050525: Super-LOTIS observations
  99. GRB 050525, spectral lag pseudo-redshift
  100. GRB050306: optical afterglow not confirmed

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