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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"

32724 results found.

  1. GRB050802: CrAO optical observations
  2. GRB050801: Unchanged decay slope
  3. GRB050802 radio non-detection
  4. GRB 050802: early Swift XRT analysis results
  5. GRB 050802: Swift/UVOT observations
  6. GRB 050802: Swift-BAT refined analysis
  7. GRB050801: Optical photometry and decay index
  8. GRB 050802: XRT position
  9. GRB 050802: Swift Gamma-ray Burst
  10. GRB050801: Swift/UVOT Optical and UV detections
  11. GCN 050801: early Swift XRT analysis results
  12. GRB 050801: Swift-BAT refined analysis
  13. GRB 050801, SMARTS optical/IR afterglow observations
  14. GRB 050801, afterglow observations
  15. GRB 050730, corrected photometry and break?
  16. GRB 050801: ROTSE-III Early Afterglow Break
  17. GRB050801: Swift-BAT detection of a burst
  18. GRB050801: GCN XRT position is incorrect
  19. GRB 050801: ROTSE-III Detection of Possible Counterpart
  20. GRB 050730: XRT refined analysis
  21. Correction to GCN Circ 3476 on GRB050525A
  22. GRB 050730: early TAROT optical observations
  23. GRB 050726: PROMPT Rc Observations
  24. GRB 050730: RTT150 optical observations
  25. Swift/UVOT photometry of GRB050730
  26. GRB 050730, spectra and optical photometry
  27. GRB050730: Refined BAT analysis of the Swift-BAT burst
  28. GRB 050730: Swift XRT afterglow observations
  29. GRB 050730 XMM-Newton observation
  30. GRB 050730: PROMPT VRcIc Observations
  31. GRB050730, afterglow observations
  32. GRB050730: confirmation of redshift
  33. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  34. GRB 050730, SMARTS optical/IR afterglow observations
  35. GRB050730: Liverpool Telescope optical observations
  36. GRB 050709: PROMPT Rc Observations
  37. GRB050713b: Maidanak optical observations
  38. GRB 050724: Secure Host Redshift from Keck
  39. GRB 050724: WHT optical observations
  40. GRB050726: Swift UVOT observations
  41. GRB 050724: Chandra Observations of the X-ray Afterglow
  42. GRB050724: Refined Radio Position
  43. GRB050713: analysis of the XMM-Newton observation
  44. GRB 050724, SMARTS optical/IR afterglow observations
  45. GRB 050726, SMARTS optical/IR observations
  46. Swift-BAT trigger 147918 is not a real GRB
  47. GRB050724: VLT observations of the variable source
  48. GRB050709: Second Epoch Chandra Observation
  49. GRB 050726: PROMPT Rc Observations
  50. GRB050709: Second Epoch Chandra Observation
  51. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  52. GRB050724: Further Radio Observations
  53. GRB 050726: early Swift XRT analysis results
  54. GRB050726: Swift-BAT detection of a weak burst
  55. GRB 050724: Optical Variability in Nearby Galaxy
  56. GRB 050724: J-band observations
  57. GRB 050724: GMOS Imaging and Spectroscopy
  58. GRB 050724: SWIFT XRT refined position
  59. RXTE ASM Detection of GRB050724
  60. GRB050724: Radio Observation
  61. GRB 050724: spectroscopy of object in the XRT error circle
  62. GRB 050724: Optical limit
  63. GRB 050724: optical and near-IR observations
  64. GRB 050724: Optical imaging/astrometry
  65. GRB 050724: RTT150 optical observations
  66. GRB 050724: Swift/UVOT Upper Limit
  67. GRB 050724: early Swift XRT analysis results
  68. GRB 050724 : Lulin early R-band monitoring observations
  69. GRB050724: Refined analysis of the Swift-BAT possible short burst
  70. GRB 050724: possible host galaxy in DSS
  71. Swift-BAT trigger 147325 is not due to a real GRB
  72. GRB050723: XRT distributed coordinates are not related to the burst
  73. GRB 050721: early afterglow light curve
  74. GRB 050721A: Swift-BAT refined analysis
  75. Correction to GCN Circ 3474 on GRB050525A
  76. GRB 050721A: Early Swift XRT analysis results
  77. GRB050721A: optical decay
  78. GRB 050721: optical afterglow confirmed
  79. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  80. GRB 050721a: Optical Observations
  81. GRB 050709: Refined Spectral and Temporal Properties
  82. GRB 050717: PROMPT RcIc Observations
  83. GRB050714b: Radio Observation
  84. GRB050712: Radio Observations
  85. GRB 050714a: Refined XRT analysis and afterglow confirmation
  86. GRB050713a: Radio Observation
  87. Swift-BAT trigger 146731 is not a real GRB
  88. GRB 050712, Tautenburg optical afterglow observations
  89. GRB 050714B: VLT R-band observations
  90. GRB 050717: Additional LCO observations
  91. GRB050717
  92. GRB 050716; J-band observations
  93. Konus-Wind observation of GRB 050717
  94. GRB 050717: LCO near-IR observations
  95. Swift/UVOT Observations of GRB 050717
  96. GRB 050717: Swift-BAT refined analysis
  97. GRB 050717: Refined XRT analysis.
  98. GRB050712: optical limits
  99. GRB050717: Swift XRT position
  100. GRB 050716 - UKIRT identification of candidate afterglow

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