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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"

36079 results found.

  1. GRB 050713 : Planned XMM-Newton observation
  2. GRB050709: Candidate X-ray Afterglow from Chandra
  3. GRB 050713, R-band observations at NOT
  4. GRB 050713: ARC NIR Detections and Identification of Fading
  5. GRB050713: possible I-band afterglow
  6. GRB 050713: Swift detection of Bright Burst
  7. GRB 050713A: ROTSE-III Optical Limits
  8. GRB 050709: Swift UVOT and XRT observations
  9. GRB 050712: Swift-BAT Refined Analysis
  10. GRB 050712: Swift XRT afterglow position
  11. GRB 050712: Swift detection of a weak burst
  12. GRB 050709: LCO40 Observations
  13. GRB050709: A Possible Short-Hard GRB Localized by HETE
  14. PROMPT Rc Observations of GRB 050709
  15. GRB 050525a: PROMPT VRcIc Detections
  16. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  17. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  18. GRB 050626 optical observations
  19. GRB 050626: Swift XRT observations
  20. GRB 050701
  21. GRB 050701, optical observations
  22. GRB 050408: ARC 3.5-meter NIR Observations
  23. GRB 050701: Refined XRT analysis
  24. Swift UVOT observations of GRB 050701
  25. GRB 050701: Swift XRT afterglow position
  26. Swift trigger 143708 is really GRB 050701
  27. GRB 050607, radio observations
  28. GRB 050626 - Correction to GCN 3552
  29. GRB 050626 - a long GRB detected with INTEGRAL
  30. GRB 050525A: Swift Late-Time Decay Rate
  31. H3804: A Possible New XRB Detected by HETE
  32. XRF 050509c: Optical monitoring
  33. IBAS Alert #2512 is NOT a GRB
  34. GRB 050416(a): Host Galaxy Redshift Determination
  35. GRB 050607: MDM Observation
  36. GRB 050607 optical decay
  37. GRB 050607: RTT150 optical observations
  38. GRB 050607 : Lulin R-band observation
  39. GRB 050607: PROMPT VRcIc Observations
  40. GRB 050607: RAPTOR-S Early Optical Limits
  41. GRB 050525a, Mid-Infrared Observations
  42. GRB 050607: Optical decay and spectral slope
  43. GRB 050607: MDM Observations
  44. GRB050607,optical observation
  45. GRB 050607 - XRT refined data analysis
  46. Optical Afterglow of GRB 050607
  47. GRB050607 optical limit by "Pi of the Sky"
  48. GRB050607: Swift Detection of a long GRB
  49. GRB050607: P60 Observations
  50. GRB 050603: prediction of t_break
  51. Limits on a SN in the field of GRB 050509b
  52. GRB 050603: Redshift
  53. GRB 050603 - XRT data analysis of the first day
  54. Konus-Wind observation of GRB 050603
  55. GRB 050603: Analysis of UVOT data
  56. GRB 050603: Swift XRT Position
  57. GRB050603: Radio Detection
  58. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  59. GRB 050603: Afterglow Identification from LCO
  60. GRB 050603: INTEGRAL shows it is not a short GRB
  61. GRB 050408: jet break in the XRT light curve
  62. GRB 050525a, infrared observations
  63. GRB 050525a, SMARTS optical/IR afterglow observations
  64. Correction to GCN Circ 3502 on GRB 050528
  65. GRB050528: updated Liverpool Telescope limits
  66. Swift-BAT GRB 050528: a soft burst
  67. Update on Swift-BAT GRB 050528 (Trigger 130679)
  68. GRB050528: BOOTES optical candidate (retraction)
  69. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  70. GRB050528: BOOTES optical candidate
  71. Possible GRB050528: no candidate from Liverpool Telescope
  72. Swift-BAT detection of possible GRB 050528
  73. GRB050525a: Radio Observations
  74. GRB 050509b: refined XRT/Chandra afterglow position analysis
  75. GRB 050525: RTT150, Optical observations
  76. GRB050525a: optical upper limits
  77. GRB 050525a: SARA Observations
  78. GRB 050525B: Swift-BAT observations
  79. GRB 050525: MITSuME Optical Observation in VRI
  80. GRB 050525a: MDM Observations
  81. GRB050525A,optical observation
  82. GRB 050525 : Lulin optical afterglow observations
  83. GRB050525: Super-LOTIS observations
  84. GRB 050525, spectral lag pseudo-redshift
  85. GRB 050525a: Gemini/GMOS Spectra
  86. GRB050306: optical afterglow not confirmed
  87. GRB 050525: BART optical observation
  88. GRB 050525A: BOOTES simultaneous optical observations
  89. GRB 050525A: Swift-BAT refined analysis
  90. GRB050525: Optical observations
  91. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  92. GRB 050525: pseudo-redshift
  93. Swift/UVOT UV and optical detections of GRB 050525
  94. Konus-Wind observation of GRB 050525
  95. GRB 050525: TAROT observations of the early afterglow
  96. INTEGRAL detection of GRB 050525
  97. GRB 050525, infrared observations
  98. GRB 050525: Optical observation
  99. GRB 050525: observatons of the optical afterglow
  100. GRB050525: ROTSE-III Refined Analysis

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