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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"

38642 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. GRB050712: XRT refined analysis
  9. GRB050709: Radio Observations
  10. GRB 050709: Swift UVOT and XRT observations
  11. GRB 050712: Swift-BAT Refined Analysis
  12. GRB050712: UVOT candidate optical counterpart
  13. GRB 050712: Swift XRT afterglow position
  14. GRB 050712: Swift detection of a weak burst
  15. GRB 050709: LCO40 Observations
  16. GRB050709, optical observations
  17. GRB050709: A Possible Short-Hard GRB Localized by HETE
  18. PROMPT Rc Observations of GRB 050709
  19. GRB 050525a: PROMPT VRcIc Detections
  20. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  21. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  22. GRB 050626 optical observations
  23. GRB 050626: Swift XRT observations
  24. GRB 050701
  25. GRB 050408: ARC 3.5-meter NIR Observations
  26. GRB 050701: Refined XRT analysis
  27. Swift UVOT observations of GRB 050701
  28. GRB050701: Swift-BAT Refined analysis
  29. GRB 050701: Swift XRT afterglow position
  30. Swift trigger 143708 is really GRB 050701
  31. GRB 050607, radio observations
  32. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  33. GRB 050626 - Correction to GCN 3552
  34. GRB 050626 - a long GRB detected with INTEGRAL
  35. GRB 050525A: Swift Late-Time Decay Rate
  36. GRB050525a: HST Observations
  37. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  38. H3804: A Possible New XRB Detected by HETE
  39. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  40. Konus-Wind observation of an intermediate burst from SGR 1806-20
  41. IBAS Alert #2512 is NOT a GRB
  42. XRF050509c: Radio Detection
  43. GRB 050416(a): Host Galaxy Redshift Determination
  44. GRB 050607: MDM Observation
  45. GRB 050607 optical decay
  46. GRB050607: refined analysis of prompt REM observations
  47. Swift/UVOT observations of GRB050607
  48. GRB 050607 : Lulin R-band observation
  49. GRB 050607: PROMPT VRcIc Observations
  50. GRB 050607: RAPTOR-S Early Optical Limits
  51. GRB 050525a, Mid-Infrared Observations
  52. GRB 050607: Optical decay and spectral slope
  53. GRB 050607: MDM Observations
  54. GRB050607,optical observation
  55. GRB 050607 - XRT refined data analysis
  56. Optical Afterglow of GRB 050607
  57. GRB050607 optical limit by "Pi of the Sky"
  58. GRB050607: Swift Detection of a long GRB
  59. GRB050607: P60 Observations
  60. GRB050607: prompt REM observations
  61. Limits on a SN in the field of GRB 050509b
  62. GRB 050603: Redshift
  63. GRB 050603 - XRT data analysis of the first day
  64. Konus-Wind observation of GRB 050603
  65. GRB 050603: Analysis of UVOT data
  66. GRB050603: Fading Afterglow observed by Swift UVOT
  67. GRB050603, submillimetre observations
  68. GRB 050603: Swift XRT Position
  69. GRB050603: Radio Detection
  70. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  71. GRB 050603: Afterglow Identification from LCO
  72. GRB 050603: INTEGRAL shows it is not a short GRB
  73. Swift/BAT Detection of GRB050603
  74. GRB 050408: jet break in the XRT light curve
  75. GRB 050525a, infrared observations
  76. GRB 050525a, SMARTS optical/IR afterglow observations
  77. GRB050528, XRT observations
  78. Correction to GCN Circ 3502 on GRB 050528
  79. Swift-BAT GRB 050528: a soft burst
  80. Update on Swift-BAT GRB 050528 (Trigger 130679)
  81. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  82. Swift-BAT detection of possible GRB 050528
  83. GRB050525a: Radio Observations
  84. GRB 050509b: refined XRT/Chandra afterglow position analysis
  85. GRB 050525: RTT150, Optical observations
  86. GRB050525a: optical upper limits
  87. GRB 050525a: SARA Observations
  88. GRB 050525B: Swift-BAT observations
  89. GRB 050525: MITSuME Optical Observation in VRI
  90. GRB 050525a: MDM Observations
  91. GRB050525A,optical observation
  92. GRB 050525 : Lulin optical afterglow observations
  93. GRB050525: Super-LOTIS observations
  94. GRB 050525, spectral lag pseudo-redshift
  95. GRB 050525a: Gemini/GMOS Spectra
  96. GRB050306: optical afterglow not confirmed
  97. GRB 050525A: Swift-BAT refined analysis
  98. GRB050525: Optical observations
  99. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  100. Swift/UVOT UV and optical detections of GRB 050525

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