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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"

22214 results found.

  1. Swift detection of a long transient (GRB 050714B?)
  2. GRB 050714, optical observations
  3. GRB 050709: Spectroscopy
  4. GRB050713B :Swift/UVOT observations
  5. GRB050712: TNG R-band observations
  6. GRB050712: Swift UVOT Observation of Afterglow Emission
  7. GRB 050713A : Lulin R-band observation
  8. GRB 050713b : Lulin R-band observations
  9. GRB050713B: Faulkes North Telescope observation
  10. RBO RI observations of GRB 050713A
  11. GRB 050713B
  12. GRB050713: Liverpool Telescope prompt observations
  13. GRB 050712, optical observations
  14. GRB050709: Candidate X-ray Afterglow from Chandra
  15. GRB 050713, R-band observations at NOT
  16. GRB 050713: ARC NIR Detections and Identification of Fading
  17. GRB 050713: Swift detection of Bright Burst
  18. GRB050709: Radio Observations
  19. GRB 050709: Swift UVOT and XRT observations
  20. GRB 050712: Swift detection of a weak burst
  21. GRB 050709: LCO40 Observations
  22. GRB050709, optical observations
  23. PROMPT Rc Observations of GRB 050709
  24. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  25. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  26. GRB 050626 optical observations
  27. GRB 050626: Swift XRT observations
  28. GRB 050701, optical observations
  29. GRB 050408: ARC 3.5-meter NIR Observations
  30. Swift UVOT observations of GRB 050701
  31. GRB 050607, radio observations
  32. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  33. GRB 050525A: Swift Late-Time Decay Rate
  34. GRB050525a: HST Observations
  35. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  36. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  37. XRF 050509c: Optical monitoring
  38. XRF050509c: Radio Detection
  39. GRB 050416(a): Host Galaxy Redshift Determination
  40. GRB 050607: RTT150 optical observations
  41. GRB050607: refined analysis of prompt REM observations
  42. Swift/UVOT observations of GRB050607
  43. GRB 050607 : Lulin R-band observation
  44. GRB 050607: PROMPT VRcIc Observations
  45. GRB 050607: RAPTOR-S Early Optical Limits
  46. GRB 050525a, Mid-Infrared Observations
  47. GRB 050607: Optical decay and spectral slope
  48. GRB 050607: MDM Observations
  49. GRB 050607 - XRT refined data analysis
  50. Optical Afterglow of GRB 050607
  51. GRB050607: Swift Detection of a long GRB
  52. GRB050607: P60 Observations
  53. GRB050607: prompt REM observations
  54. GRB 050603: prediction of t_break
  55. GRB 050603 - XRT data analysis of the first day
  56. GRB 050603: Analysis of UVOT data
  57. GRB050603: Fading Afterglow observed by Swift UVOT
  58. GRB050603, submillimetre observations
  59. GRB 050603: Swift XRT Position
  60. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  61. Swift/BAT Detection of GRB050603
  62. GRB 050408: jet break in the XRT light curve
  63. GRB 050525a, infrared observations
  64. GRB 050525a, SMARTS optical/IR afterglow observations
  65. GRB050528, XRT observations
  66. GRB050528: updated Liverpool Telescope limits
  67. Possible GRB050528: no candidate from Liverpool Telescope
  68. GRB050525a: Radio Observations
  69. GRB 050525: RTT150, Optical observations
  70. GRB 050525a: SARA Observations
  71. GRB 050525B: Swift-BAT observations
  72. GRB 050525a: MDM Observations
  73. GRB 050525 : Lulin optical afterglow observations
  74. GRB050525: Super-LOTIS observations
  75. GRB050306: optical afterglow not confirmed
  76. GRB 050525A: BOOTES simultaneous optical observations
  77. GRB050525: Optical observations
  78. GRB 050525: TAROT observations of the early afterglow
  79. GRB 050525, infrared observations
  80. GRB 050525: observatons of the optical afterglow
  81. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  82. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  83. XRF050522: NIR observations of XRT candidate
  84. XRF 050522: Swift XRT refined analysis
  85. XRF050522: Radio Observations
  86. XRF 050522: Continued NIR P200 Monitoring
  87. RBO Observations of GRB050522
  88. GRB050509b: optical observations
  89. GRB050520: Radio Observations
  90. XRF 050522: Swift XRT observation
  91. XRF050522, BVRcIc field photometry
  92. XRF 050522 : Lulin observations
  93. XRF050522: Optical Observations
  94. XRF050522: Near-infrared Observations
  95. XRF 050522: KAIT observations
  96. GRB 050520: VLT/ULTRACAM observations
  97. Swift UVOT Observations of GRB 050520
  98. XRF 050509c: Swift XRT Upper Limit
  99. XRF050509c: Radio Observations
  100. RBO Observations of GRB050520

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