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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"

36210 results found.

  1. GCN 050801: early Swift XRT analysis results
  2. GRB 050801: Swift-BAT refined analysis
  3. GRB 050801, SMARTS optical/IR afterglow observations
  4. GRB 050801, afterglow observations
  5. GRB 050730, corrected photometry and break?
  6. GRB 050801: ROTSE-III Early Afterglow Break
  7. GRB050801: Swift-BAT detection of a burst
  8. GRB 050801: ROTSE-III Detection of Possible Counterpart
  9. GRB 050730: XRT refined analysis
  10. Correction to GCN Circ 3476 on GRB050525A
  11. GRB 050730: early TAROT optical observations
  12. GRB 050726: PROMPT Rc Observations
  13. GRB 050730: RTT150 optical observations
  14. GRB 050730, spectra and optical photometry
  15. GRB050730: Refined BAT analysis of the Swift-BAT burst
  16. GRB 050730: Swift XRT afterglow observations
  17. GRB 050730 XMM-Newton observation
  18. GRB 050730: PROMPT VRcIc Observations
  19. GRB050730, afterglow observations
  20. GRB050730: confirmation of redshift
  21. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  22. GRB 050730, SMARTS optical/IR afterglow observations
  23. GRB 050730 : Planned XMM-Newton observation
  24. GRB050730: Liverpool Telescope optical observations
  25. GRB 050730, optical candidate
  26. GRB050730: Swift-BAT detection of a weak burst
  27. GRB 050713A: Swift XRT extended light curve
  28. GRB 050709: PROMPT Rc Observations
  29. GRB050713b: Maidanak optical observations
  30. GRB 050724: Secure Host Redshift from Keck
  31. GRB 050724: WHT optical observations
  32. GRB 050724: Chandra Observations of the X-ray Afterglow
  33. GRB050713: analysis of the XMM-Newton observation
  34. GRB 050724, SMARTS optical/IR afterglow observations
  35. GRB 050726, SMARTS optical/IR observations
  36. Swift-BAT trigger 147918 is not a real GRB
  37. GRB 050727: RTT150 optical observations
  38. GRB050727: KAIT optical limit
  39. GRB050709: Second Epoch Chandra Observation
  40. GRB 050726: PROMPT Rc Observations
  41. GRB050709: Second Epoch Chandra Observation
  42. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  43. GRB 050726: early Swift XRT analysis results
  44. GRB 050724: Optical Variability in Nearby Galaxy
  45. GRB 050724: J-band observations
  46. GRB 050724: GMOS Imaging and Spectroscopy
  47. GRB 050724: SWIFT XRT refined position
  48. GRB 050724: spectroscopy of object in the XRT error circle
  49. GRB 050724: Optical limit
  50. GRB 050724: optical and near-IR observations
  51. GRB 050724: Optical imaging/astrometry
  52. GRB 050724: RTT150 optical observations
  53. GRB 050724: Swift/UVOT Upper Limit
  54. GRB 050724: early Swift XRT analysis results
  55. GRB 050724 : Lulin early R-band monitoring observations
  56. GRB050724: Refined analysis of the Swift-BAT possible short burst
  57. GRB 050724: possible host galaxy in DSS
  58. Swift-BAT trigger 147325 is not due to a real GRB
  59. GRB050723: XRT distributed coordinates are not related to the burst
  60. GRB 050721: early afterglow light curve
  61. GRB 050721A: Swift-BAT refined analysis
  62. Correction to GCN Circ 3474 on GRB050525A
  63. GRB 050721A: Early Swift XRT analysis results
  64. GRB050721A: optical decay
  65. GRB 050721: optical afterglow confirmed
  66. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  67. GRB 050721a: Optical Observations
  68. GRB 050709: Refined Spectral and Temporal Properties
  69. GRB 050717: PROMPT RcIc Observations
  70. GRB 050714a: Refined XRT analysis and afterglow confirmation
  71. Swift-BAT trigger 146731 is not a real GRB
  72. GRB 050712, Tautenburg optical afterglow observations
  73. Swift-BAT detection of a possible GRB
  74. GRB 050714B: VLT R-band observations
  75. GRB 050717: Additional LCO observations
  76. GRB050717
  77. GRB 050716; J-band observations
  78. Konus-Wind observation of GRB 050717
  79. GRB 050717: LCO near-IR observations
  80. Swift/UVOT Observations of GRB 050717
  81. GRB 050717: Swift-BAT refined analysis
  82. GRB 050717: Refined XRT analysis.
  83. GRB050712: optical limits
  84. Swift detection of GRB 050717
  85. GRB 050716 - UKIRT identification of candidate afterglow
  86. Swift UVOT Observations of GRB 050716
  87. GRB 050716: Refined XRT analysis.
  88. GRB 050716: Lulin B and R band optical observations
  89. GRB050716, optical observation
  90. GRB 050716: Optical Observations
  91. GRB050716: Faulkes North Telescope observation
  92. Swift/BAT detection of GRB 050716
  93. GRB 050715: Swift-BAT detection
  94. Swift UVOT Observations of GRB 050714B
  95. Konus-Wind observation of GRB 050713A
  96. GRB 050714B: refined XRT analysis
  97. GRB 050713b: RTT150 optical observations
  98. GRB 050714B: candidate afterglow does not fade
  99. GRB050714B: Refined analysis of the Swift-BAT burst
  100. GRB 050714B: optical afterglow

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