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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"

21799 results found.

  1. Konus-Wind observation of GRB 050713A
  2. GRB 050714B: refined XRT analysis
  3. GRB 050713b: RTT150 optical observations
  4. GRB 050714B: optical afterglow
  5. GRB 050714, R-band candidate
  6. GRB 050714, optical observations
  7. GRB 050714A: ROTSE-III Optical Limits
  8. GRB 050713A: RAPTOR detection of early optical emission
  9. GRB050713B :Swift/UVOT observations
  10. GRB050712: TNG R-band observations
  11. GRB 050713A: Swift/UVOT observation
  12. GRB050712: Swift UVOT Observation of Afterglow Emission
  13. GRB 050713A : Lulin R-band observation
  14. GRB 050713A XMM-Newton observation
  15. GRB050713B: Faulkes North Telescope observation
  16. RBO RI observations of GRB 050713A
  17. GRB050709 : Chandra source optical counterpart
  18. GRB 050712, optical observations
  19. GRB050709: Candidate X-ray Afterglow from Chandra
  20. GRB050713: possible I-band afterglow
  21. GRB 050713A: ROTSE-III Optical Limits
  22. GRB050709: Radio Observations
  23. GRB 050709: Swift UVOT and XRT observations
  24. GRB050712: UVOT candidate optical counterpart
  25. GRB 050712: Swift detection of a weak burst
  26. GRB 050709: LCO40 Observations
  27. PROMPT Rc Observations of GRB 050709
  28. GRB 050525a: PROMPT VRcIc Detections
  29. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  30. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  31. GRB 050408: ARC 3.5-meter NIR Observations
  32. Swift UVOT observations of GRB 050701
  33. GRB 050607, radio observations
  34. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  35. GRB050525a: HST Observations
  36. XRF 050509c: Optical monitoring
  37. XRF050509c: Radio Detection
  38. GRB 050607 optical decay
  39. GRB050607: refined analysis of prompt REM observations
  40. GRB 050607: PROMPT VRcIc Observations
  41. GRB 050607: Optical decay and spectral slope
  42. GRB050607,optical observation
  43. GRB 050607 - XRT refined data analysis
  44. Optical Afterglow of GRB 050607
  45. GRB050607: Swift Detection of a long GRB
  46. GRB050607: prompt REM observations
  47. Limits on a SN in the field of GRB 050509b
  48. GRB 050603: Redshift
  49. GRB 050603 - XRT data analysis of the first day
  50. Konus-Wind observation of GRB 050603
  51. GRB050603, submillimetre observations
  52. GRB050603: Radio Detection
  53. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  54. GRB 050603: INTEGRAL shows it is not a short GRB
  55. GRB 050525a, infrared observations
  56. GRB050528: updated Liverpool Telescope limits
  57. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  58. Possible GRB050528: no candidate from Liverpool Telescope
  59. GRB050525a: Radio Observations
  60. GRB 050509b: refined XRT/Chandra afterglow position analysis
  61. GRB 050525: RTT150, Optical observations
  62. GRB 050525a: SARA Observations
  63. GRB 050525B: Swift-BAT observations
  64. GRB 050525: MITSuME Optical Observation in VRI
  65. GRB050525A,optical observation
  66. GRB050525: Super-LOTIS observations
  67. GRB050306: optical afterglow not confirmed
  68. GRB 050525: BART optical observation
  69. GRB 050525A: BOOTES simultaneous optical observations
  70. GRB 050525A: Swift-BAT refined analysis
  71. GRB050525: Optical observations
  72. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  73. Konus-Wind observation of GRB 050525
  74. GRB 050525: TAROT observations of the early afterglow
  75. INTEGRAL detection of GRB 050525
  76. GRB 050525, infrared observations
  77. GRB 050525: observatons of the optical afterglow
  78. GRB050525: ROTSE-III Refined Analysis
  79. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  80. XRF 050522: Swift XRT refined analysis
  81. XRF050522: Radio Observations
  82. Swift/UVOT observation of XRF 050522
  83. GRB 050509A: Further I-band imaging
  84. GRB050522,optical observation
  85. GRB050520,optical observation
  86. XRF 050522: Continued NIR P200 Monitoring
  87. Recent GRB BVRcIc field photometry
  88. GRB050520: Radio Observations
  89. XRF 050522: Swift XRT observation
  90. XRF050522, BVRcIc field photometry
  91. XRF050522: Optical Observations
  92. XRF050522: Near-infrared Observations
  93. GRB 050520: VLT/ULTRACAM observations
  94. Swift UVOT Observations of GRB 050520
  95. GRB 050520: Swift XRT refined analysis
  96. XRF050509c: Radio Observations
  97. RBO Observations of GRB050520
  98. GRB 050520: P200 Observations
  99. GRB 050520: TAROT optical limit
  100. GRB 050520: Swift XRT position

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