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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"

37985 results found.

  1. GRB 050730: early TAROT optical observations
  2. GRB 050726: PROMPT Rc Observations
  3. GRB 050730: RTT150 optical observations
  4. Swift/UVOT photometry of GRB050730
  5. GRB 050730, spectra and optical photometry
  6. GRB050730: Refined BAT analysis of the Swift-BAT burst
  7. GRB 050730: Swift XRT afterglow observations
  8. GRB 050730 XMM-Newton observation
  9. GRB 050730: PROMPT VRcIc Observations
  10. GRB050730, afterglow observations
  11. GRB050730: confirmation of redshift
  12. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  13. GRB 050730, SMARTS optical/IR afterglow observations
  14. GRB 050730 : Planned XMM-Newton observation
  15. GRB050730: Liverpool Telescope optical observations
  16. GRB 050730, optical candidate
  17. GRB050730: Swift-BAT detection of a weak burst
  18. GRB 050713A: Swift XRT extended light curve
  19. GRB 050709: PROMPT Rc Observations
  20. GRB050713b: Maidanak optical observations
  21. GRB 050724: Secure Host Redshift from Keck
  22. GRB 050724: WHT optical observations
  23. GRB050726: Swift UVOT observations
  24. GRB 050724: Chandra Observations of the X-ray Afterglow
  25. GRB050713: analysis of the XMM-Newton observation
  26. GRB 050724, SMARTS optical/IR afterglow observations
  27. GRB 050726, SMARTS optical/IR observations
  28. Swift-BAT trigger 147918 is not a real GRB
  29. GRB 050727: RTT150 optical observations
  30. GRB050727: KAIT optical limit
  31. GRB050709: Second Epoch Chandra Observation
  32. GRB 050726: PROMPT Rc Observations
  33. GRB050709: Second Epoch Chandra Observation
  34. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  35. GRB 050726: early Swift XRT analysis results
  36. GRB050726: Swift-BAT detection of a weak burst
  37. GRB 050724: Optical Variability in Nearby Galaxy
  38. GRB 050724: J-band observations
  39. GRB 050724: GMOS Imaging and Spectroscopy
  40. GRB 050724: SWIFT XRT refined position
  41. GRB 050724: spectroscopy of object in the XRT error circle
  42. GRB 050724: Optical limit
  43. GRB 050724: optical and near-IR observations
  44. GRB 050724: Optical imaging/astrometry
  45. GRB 050724: RTT150 optical observations
  46. GRB 050724: Swift/UVOT Upper Limit
  47. GRB 050724: early Swift XRT analysis results
  48. GRB 050724 : Lulin early R-band monitoring observations
  49. GRB050724: Refined analysis of the Swift-BAT possible short burst
  50. GRB 050724: possible host galaxy in DSS
  51. GRB050724: a short-burst detected by Swift
  52. Swift-BAT trigger 147325 is not due to a real GRB
  53. GRB050723: XRT distributed coordinates are not related to the burst
  54. GRB 050721: early afterglow light curve
  55. GRB 050721A: Swift-BAT refined analysis
  56. Correction to GCN Circ 3474 on GRB050525A
  57. GRB 050721A: Early Swift XRT analysis results
  58. GRB050721A: optical decay
  59. GRB 050721: optical afterglow confirmed
  60. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  61. GRB 050721a: Optical Observations
  62. GRB050721A: Swift-BAT detection of a weak burst
  63. GRB 050709: Refined Spectral and Temporal Properties
  64. GRB 050717: PROMPT RcIc Observations
  65. GRB 050714a: Refined XRT analysis and afterglow confirmation
  66. Swift-BAT trigger 146731 is not a real GRB
  67. GRB 050712, Tautenburg optical afterglow observations
  68. Swift-BAT detection of a possible GRB
  69. GRB 050714B: VLT R-band observations
  70. GRB 050717: Additional LCO observations
  71. GRB050717
  72. GRB 050716; J-band observations
  73. Konus-Wind observation of GRB 050717
  74. GRB 050717: LCO near-IR observations
  75. Swift/UVOT Observations of GRB 050717
  76. GRB 050717: Swift-BAT refined analysis
  77. GRB 050717: Refined XRT analysis.
  78. GRB050712: optical limits
  79. GRB050717: Swift XRT position
  80. Swift detection of GRB 050717
  81. GRB 050716 - UKIRT identification of candidate afterglow
  82. Swift UVOT Observations of GRB 050716
  83. GRB 050716: Refined XRT analysis.
  84. GRB050716: Refined analysis of the Swift-BAT burst
  85. GRB 050716: Lulin B and R band optical observations
  86. GRB050716, optical observation
  87. GRB 050716: Optical Observations
  88. GRB050716: Faulkes North Telescope observation
  89. GRB050716: Correction to sign in XRT coordinate
  90. Swift/BAT detection of GRB 050716
  91. GRB050715: Refined analysis of the Swift-BAT burst
  92. GRB 050715: Swift-BAT detection
  93. Swift UVOT Observations of GRB 050714B
  94. Konus-Wind observation of GRB 050713A
  95. GRB 050714B: refined XRT analysis
  96. GRB 050713b: RTT150 optical observations
  97. GRB 050714B: candidate afterglow does not fade
  98. GRB050714B: Refined analysis of the Swift-BAT burst
  99. GRB 050714B: optical afterglow
  100. Swift detection of a long transient (GRB 050714B?)

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