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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"

36215 results found.

  1. GRB 050802: Swift-BAT refined analysis
  2. GRB050801: Optical photometry and decay index
  3. GRB 050802: XRT position
  4. GRB 050802: Swift Gamma-ray Burst
  5. GRB 050730: Preliminary Analysis of MIKE Spectrum
  6. GCN 050801: early Swift XRT analysis results
  7. GRB 050801: Swift-BAT refined analysis
  8. GRB 050801, SMARTS optical/IR afterglow observations
  9. GRB 050801, afterglow observations
  10. GRB 050730, corrected photometry and break?
  11. GRB 050801: ROTSE-III Early Afterglow Break
  12. GRB050801: Swift-BAT detection of a burst
  13. GRB 050801: ROTSE-III Detection of Possible Counterpart
  14. GRB 050730: XRT refined analysis
  15. Correction to GCN Circ 3476 on GRB050525A
  16. GRB 050730: early TAROT optical observations
  17. GRB 050726: PROMPT Rc Observations
  18. GRB 050730: RTT150 optical observations
  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. GRB 050730 : Planned XMM-Newton observation
  29. GRB050730: Liverpool Telescope optical observations
  30. GRB 050730, optical candidate
  31. GRB050730: Swift-BAT detection of a weak burst
  32. GRB 050713A: Swift XRT extended light curve
  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. GRB 050724: Chandra Observations of the X-ray Afterglow
  38. GRB050713: analysis of the XMM-Newton observation
  39. GRB 050724, SMARTS optical/IR afterglow observations
  40. GRB 050726, SMARTS optical/IR observations
  41. Swift-BAT trigger 147918 is not a real GRB
  42. GRB 050727: RTT150 optical observations
  43. GRB050727: KAIT optical limit
  44. GRB050709: Second Epoch Chandra Observation
  45. GRB 050726: PROMPT Rc Observations
  46. GRB050709: Second Epoch Chandra Observation
  47. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  48. GRB 050726: early Swift XRT analysis results
  49. GRB 050724: Optical Variability in Nearby Galaxy
  50. GRB 050724: J-band observations
  51. GRB 050724: GMOS Imaging and Spectroscopy
  52. GRB 050724: SWIFT XRT refined position
  53. GRB 050724: spectroscopy of object in the XRT error circle
  54. GRB 050724: Optical limit
  55. GRB 050724: optical and near-IR observations
  56. GRB 050724: Optical imaging/astrometry
  57. GRB 050724: RTT150 optical observations
  58. GRB 050724: Swift/UVOT Upper Limit
  59. GRB 050724: early Swift XRT analysis results
  60. GRB 050724 : Lulin early R-band monitoring observations
  61. GRB050724: Refined analysis of the Swift-BAT possible short burst
  62. GRB 050724: possible host galaxy in DSS
  63. Swift-BAT trigger 147325 is not due to a real GRB
  64. GRB050723: XRT distributed coordinates are not related to the burst
  65. GRB 050721: early afterglow light curve
  66. GRB 050721A: Swift-BAT refined analysis
  67. Correction to GCN Circ 3474 on GRB050525A
  68. GRB 050721A: Early Swift XRT analysis results
  69. GRB050721A: optical decay
  70. GRB 050721: optical afterglow confirmed
  71. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  72. GRB 050721a: Optical Observations
  73. GRB 050709: Refined Spectral and Temporal Properties
  74. GRB 050717: PROMPT RcIc Observations
  75. GRB 050714a: Refined XRT analysis and afterglow confirmation
  76. Swift-BAT trigger 146731 is not a real GRB
  77. GRB 050712, Tautenburg optical afterglow observations
  78. Swift-BAT detection of a possible GRB
  79. GRB 050714B: VLT R-band observations
  80. GRB 050717: Additional LCO observations
  81. GRB050717
  82. GRB 050716; J-band observations
  83. Konus-Wind observation of GRB 050717
  84. GRB 050717: LCO near-IR observations
  85. Swift/UVOT Observations of GRB 050717
  86. GRB 050717: Swift-BAT refined analysis
  87. GRB 050717: Refined XRT analysis.
  88. GRB050712: optical limits
  89. Swift detection of GRB 050717
  90. GRB 050716 - UKIRT identification of candidate afterglow
  91. Swift UVOT Observations of GRB 050716
  92. GRB 050716: Refined XRT analysis.
  93. GRB 050716: Lulin B and R band optical observations
  94. GRB050716, optical observation
  95. GRB 050716: Optical Observations
  96. GRB050716: Faulkes North Telescope observation
  97. Swift/BAT detection of GRB 050716
  98. GRB 050715: Swift-BAT detection
  99. Swift UVOT Observations of GRB 050714B
  100. Konus-Wind observation of GRB 050713A

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