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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"

32717 results found.

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

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