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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"

26340 results found.

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

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