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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"

26326 results found.

  1. GRB 050716: Lulin B and R band optical observations
  2. GRB050716, optical observation
  3. GRB050716: Faulkes North Telescope observation
  4. GRB050715: Refined analysis of the Swift-BAT burst
  5. GRB 050715: Swift-BAT detection
  6. GRB 050713b: RTT150 optical observations
  7. GRB050714B: Refined analysis of the Swift-BAT burst
  8. GRB 050714B: optical afterglow
  9. GRB 050714, R-band candidate
  10. GRB 050714, optical observations
  11. GRB 050713A: XRT refined analysis
  12. GRB 050713A: RAPTOR detection of early optical emission
  13. GRB050713B :Swift/UVOT observations
  14. GRB050713b: XRT refined analysis
  15. GRB050712: TNG R-band observations
  16. GRB 050713B: Swift-BAT Refined Analysis
  17. GRB 050713A: Swift/UVOT observation
  18. GRB 050713A : Swift-BAT Refined Analysis
  19. GRB050712: Swift UVOT Observation of Afterglow Emission
  20. GRB 050713A : Lulin R-band observation
  21. GRB 050713A XMM-Newton observation
  22. GRB 050713b : Lulin R-band observations
  23. GRB050713B: Faulkes North Telescope observation
  24. RBO RI observations of GRB 050713A
  25. GRB 050713B
  26. GRB050709 : Chandra source optical counterpart
  27. GRB050713: Liverpool Telescope prompt observations
  28. GRB 050712, optical observations
  29. GRB050709: Candidate X-ray Afterglow from Chandra
  30. GRB050713: possible I-band afterglow
  31. GRB050712: XRT refined analysis
  32. GRB050709: Radio Observations
  33. GRB 050709: Swift UVOT and XRT observations
  34. GRB 050712: Swift-BAT Refined Analysis
  35. GRB050712: UVOT candidate optical counterpart
  36. GRB 050709: LCO40 Observations
  37. GRB050709, optical observations
  38. PROMPT Rc Observations of GRB 050709
  39. GRB 050525a: PROMPT VRcIc Detections
  40. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  41. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  42. GRB 050626: Swift XRT observations
  43. GRB 050408: ARC 3.5-meter NIR Observations
  44. GRB 050701: Refined XRT analysis
  45. Swift UVOT observations of GRB 050701
  46. GRB050701: Swift-BAT Refined analysis
  47. Swift trigger 143708 is really GRB 050701
  48. GRB 050607, radio observations
  49. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  50. GRB050525a: HST Observations
  51. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  52. XRF 050509c: Optical monitoring
  53. Konus-Wind observation of an intermediate burst from SGR 1806-20
  54. XRF050509c: Radio Detection
  55. GRB 050607 optical decay
  56. GRB050607: refined analysis of prompt REM observations
  57. GRB 050607: PROMPT VRcIc Observations
  58. GRB 050607: Optical decay and spectral slope
  59. GRB050607,optical observation
  60. Optical Afterglow of GRB 050607
  61. GRB050607: Swift Detection of a long GRB
  62. GRB050607: prompt REM observations
  63. Limits on a SN in the field of GRB 050509b
  64. GRB 050603 - XRT data analysis of the first day
  65. GRB050603, submillimetre observations
  66. GRB050603: Radio Detection
  67. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  68. GRB 050603: INTEGRAL shows it is not a short GRB
  69. GRB 050525a, infrared observations
  70. GRB050528, XRT observations
  71. GRB050528: updated Liverpool Telescope limits
  72. Swift-BAT GRB 050528: a soft burst
  73. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  74. Possible GRB050528: no candidate from Liverpool Telescope
  75. GRB050525a: Radio Observations
  76. GRB 050509b: refined XRT/Chandra afterglow position analysis
  77. GRB 050525: RTT150, Optical observations
  78. GRB 050525a: SARA Observations
  79. GRB 050525B: Swift-BAT observations
  80. GRB 050525: MITSuME Optical Observation in VRI
  81. GRB050525A,optical observation
  82. GRB050525: Super-LOTIS observations
  83. GRB 050525, spectral lag pseudo-redshift
  84. GRB050306: optical afterglow not confirmed
  85. GRB 050525: BART optical observation
  86. GRB 050525A: BOOTES simultaneous optical observations
  87. GRB 050525A: Swift-BAT refined analysis
  88. GRB050525: Optical observations
  89. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  90. Konus-Wind observation of GRB 050525
  91. GRB 050525: TAROT observations of the early afterglow
  92. INTEGRAL detection of GRB 050525
  93. GRB 050525, infrared observations
  94. GRB 050525: observatons of the optical afterglow
  95. GRB050525: ROTSE-III Refined Analysis
  96. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  97. XRF050522: Radio Observations
  98. Swift/UVOT observation of XRF 050522
  99. GRB 050509A: Further I-band imaging
  100. GRB050522,optical observation

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