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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"

32721 results found.

  1. GRB 050802: early Swift XRT analysis results
  2. GRB 050802: Swift/UVOT observations
  3. GRB 050802: Swift-BAT refined analysis
  4. GRB050801: Optical photometry and decay index
  5. GRB 050802: XRT position
  6. GRB 050802: Swift Gamma-ray Burst
  7. GRB050801: Swift/UVOT Optical and UV detections
  8. GCN 050801: early Swift XRT analysis results
  9. GRB 050801: Swift-BAT refined analysis
  10. GRB 050801, SMARTS optical/IR afterglow observations
  11. GRB 050801, afterglow observations
  12. GRB 050730, corrected photometry and break?
  13. GRB 050801: ROTSE-III Early Afterglow Break
  14. GRB050801: Swift-BAT detection of a burst
  15. GRB050801: GCN XRT position is incorrect
  16. GRB 050801: ROTSE-III Detection of Possible Counterpart
  17. GRB 050730: XRT refined analysis
  18. Correction to GCN Circ 3476 on GRB050525A
  19. GRB 050730: early TAROT optical observations
  20. GRB 050726: PROMPT Rc Observations
  21. GRB 050730: RTT150 optical observations
  22. Swift/UVOT photometry of GRB050730
  23. GRB 050730, spectra and optical photometry
  24. GRB050730: Refined BAT analysis of the Swift-BAT burst
  25. GRB 050730: Swift XRT afterglow observations
  26. GRB 050730 XMM-Newton observation
  27. GRB 050730: PROMPT VRcIc Observations
  28. GRB050730, afterglow observations
  29. GRB050730: confirmation of redshift
  30. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  31. GRB 050730, SMARTS optical/IR afterglow observations
  32. GRB050730: Liverpool Telescope optical observations
  33. GRB 050709: PROMPT Rc Observations
  34. GRB050713b: Maidanak optical observations
  35. GRB 050724: Secure Host Redshift from Keck
  36. GRB 050724: WHT optical observations
  37. GRB050726: Swift UVOT observations
  38. GRB 050724: Chandra Observations of the X-ray Afterglow
  39. GRB050724: Refined Radio Position
  40. GRB050713: analysis of the XMM-Newton observation
  41. GRB 050724, SMARTS optical/IR afterglow observations
  42. GRB 050726, SMARTS optical/IR observations
  43. Swift-BAT trigger 147918 is not a real GRB
  44. GRB050724: VLT observations of the variable source
  45. GRB050709: Second Epoch Chandra Observation
  46. GRB 050726: PROMPT Rc Observations
  47. GRB050709: Second Epoch Chandra Observation
  48. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  49. GRB050724: Further Radio Observations
  50. GRB 050726: early Swift XRT analysis results
  51. GRB050726: Swift-BAT detection of a weak burst
  52. GRB 050724: Optical Variability in Nearby Galaxy
  53. GRB 050724: J-band observations
  54. GRB 050724: GMOS Imaging and Spectroscopy
  55. GRB 050724: SWIFT XRT refined position
  56. RXTE ASM Detection of GRB050724
  57. GRB050724: Radio Observation
  58. GRB 050724: spectroscopy of object in the XRT error circle
  59. GRB 050724: Optical limit
  60. GRB 050724: optical and near-IR observations
  61. GRB 050724: Optical imaging/astrometry
  62. GRB 050724: RTT150 optical observations
  63. GRB 050724: Swift/UVOT Upper Limit
  64. GRB 050724: early Swift XRT analysis results
  65. GRB 050724 : Lulin early R-band monitoring observations
  66. GRB050724: Refined analysis of the Swift-BAT possible short burst
  67. GRB 050724: possible host galaxy in DSS
  68. Swift-BAT trigger 147325 is not due to a real GRB
  69. GRB050723: XRT distributed coordinates are not related to the burst
  70. GRB 050721: early afterglow light curve
  71. GRB 050721A: Swift-BAT refined analysis
  72. Correction to GCN Circ 3474 on GRB050525A
  73. GRB 050721A: Early Swift XRT analysis results
  74. GRB050721A: optical decay
  75. GRB 050721: optical afterglow confirmed
  76. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  77. GRB 050721a: Optical Observations
  78. GRB 050709: Refined Spectral and Temporal Properties
  79. GRB 050717: PROMPT RcIc Observations
  80. GRB050714b: Radio Observation
  81. GRB050712: Radio Observations
  82. GRB 050714a: Refined XRT analysis and afterglow confirmation
  83. GRB050713a: Radio Observation
  84. Swift-BAT trigger 146731 is not a real GRB
  85. GRB 050712, Tautenburg optical afterglow observations
  86. GRB 050714B: VLT R-band observations
  87. GRB 050717: Additional LCO observations
  88. GRB050717
  89. GRB 050716; J-band observations
  90. Konus-Wind observation of GRB 050717
  91. GRB 050717: LCO near-IR observations
  92. Swift/UVOT Observations of GRB 050717
  93. GRB 050717: Swift-BAT refined analysis
  94. GRB 050717: Refined XRT analysis.
  95. GRB050712: optical limits
  96. GRB050717: Swift XRT position
  97. GRB 050716 - UKIRT identification of candidate afterglow
  98. Swift UVOT Observations of GRB 050716
  99. GRB 050716: Refined XRT analysis.
  100. GRB050716: Refined analysis of the Swift-BAT burst

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