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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"

39364 results found.

  1. GRB 050730: RTT150 optical observations
  2. GRB 050730, spectra and optical photometry
  3. GRB050730: Refined BAT analysis of the Swift-BAT burst
  4. GRB 050730: Swift XRT afterglow observations
  5. GRB 050730 XMM-Newton observation
  6. GRB 050730: PROMPT VRcIc Observations
  7. GRB050730, afterglow observations
  8. GRB050730: confirmation of redshift
  9. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  10. GRB 050730, SMARTS optical/IR afterglow observations
  11. GRB 050730 : Planned XMM-Newton observation
  12. GRB050730: Liverpool Telescope optical observations
  13. GRB 050730, optical candidate
  14. GRB050730: Swift-BAT detection of a weak burst
  15. GRB 050713A: Swift XRT extended light curve
  16. GRB 050709: PROMPT Rc Observations
  17. GRB050713b: Maidanak optical observations
  18. GRB 050724: Secure Host Redshift from Keck
  19. GRB 050724: WHT optical observations
  20. GRB 050724: Chandra Observations of the X-ray Afterglow
  21. GRB050713: analysis of the XMM-Newton observation
  22. GRB 050724, SMARTS optical/IR afterglow observations
  23. GRB 050726, SMARTS optical/IR observations
  24. Swift-BAT trigger 147918 is not a real GRB
  25. GRB 050727: RTT150 optical observations
  26. GRB050727: KAIT optical limit
  27. GRB050709: Second Epoch Chandra Observation
  28. GRB 050726: PROMPT Rc Observations
  29. GRB050709: Second Epoch Chandra Observation
  30. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  31. GRB 050726: early Swift XRT analysis results
  32. GRB050726: Swift-BAT detection of a weak burst
  33. GRB 050724: Optical Variability in Nearby Galaxy
  34. GRB 050724: J-band observations
  35. GRB 050724: GMOS Imaging and Spectroscopy
  36. GRB 050724: SWIFT XRT refined position
  37. GRB 050724: spectroscopy of object in the XRT error circle
  38. GRB 050724: Optical limit
  39. GRB 050724: optical and near-IR observations
  40. GRB 050724: Optical imaging/astrometry
  41. GRB 050724: RTT150 optical observations
  42. GRB 050724: Swift/UVOT Upper Limit
  43. GRB 050724: early Swift XRT analysis results
  44. GRB 050724 : Lulin early R-band monitoring observations
  45. GRB050724: Refined analysis of the Swift-BAT possible short burst
  46. GRB 050724: possible host galaxy in DSS
  47. GRB050724: a short-burst detected by Swift
  48. Swift-BAT trigger 147325 is not due to a real GRB
  49. GRB050723: XRT distributed coordinates are not related to the burst
  50. GRB 050721: early afterglow light curve
  51. GRB 050721A: Swift-BAT refined analysis
  52. Correction to GCN Circ 3474 on GRB050525A
  53. GRB 050721A: Early Swift XRT analysis results
  54. GRB050721A: optical decay
  55. GRB 050721: optical afterglow confirmed
  56. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  57. GRB 050721a: Optical Observations
  58. GRB050721A: Swift-BAT detection of a weak burst
  59. GRB 050709: Refined Spectral and Temporal Properties
  60. GRB 050717: PROMPT RcIc Observations
  61. GRB 050714a: Refined XRT analysis and afterglow confirmation
  62. Swift-BAT trigger 146731 is not a real GRB
  63. GRB 050712, Tautenburg optical afterglow observations
  64. Swift-BAT detection of a possible GRB
  65. GRB 050714B: VLT R-band observations
  66. GRB 050717: Additional LCO observations
  67. GRB050717
  68. GRB 050716; J-band observations
  69. Konus-Wind observation of GRB 050717
  70. GRB 050717: LCO near-IR observations
  71. Swift/UVOT Observations of GRB 050717
  72. GRB 050717: Swift-BAT refined analysis
  73. GRB 050717: Refined XRT analysis.
  74. GRB050712: optical limits
  75. Swift detection of GRB 050717
  76. GRB 050716 - UKIRT identification of candidate afterglow
  77. Swift UVOT Observations of GRB 050716
  78. GRB 050716: Refined XRT analysis.
  79. GRB 050716: Lulin B and R band optical observations
  80. GRB050716, optical observation
  81. GRB 050716: Optical Observations
  82. GRB050716: Faulkes North Telescope observation
  83. Swift/BAT detection of GRB 050716
  84. GRB 050715: Swift-BAT detection
  85. Swift UVOT Observations of GRB 050714B
  86. Konus-Wind observation of GRB 050713A
  87. GRB 050714B: refined XRT analysis
  88. GRB 050713b: RTT150 optical observations
  89. GRB 050714B: candidate afterglow does not fade
  90. GRB050714B: Refined analysis of the Swift-BAT burst
  91. GRB 050714B: optical afterglow
  92. Swift detection of a long transient (GRB 050714B?)
  93. GRB 050709: optical afterglow candidate
  94. GRB 050714, R-band candidate
  95. GRB 050714: Swift XRT afterglow position
  96. GRB 050714, optical observations
  97. GRB 050714A: ROTSE-III Optical Limits
  98. GRB 050714 - A long GRB detected with INTEGRAL
  99. GRB 050713A: XRT refined analysis
  100. GRB 050709: Spectroscopy

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