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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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').

17112 results found.

  1. GRB 050814: Swift detection of a burst
  2. GRB050813, SDSS pre-burst observations
  3. GRB 050813: KAIT optical limit
  4. GRB 050813: Swift-BAT refined analysis
  5. GRB050813: SWIFT/UVOT observation
  6. GRB 050813: Swift XRT afterglow localization
  7. GRB 050813: Possible Short Swift-BAT GRB
  8. GRB050813 (Swift 150139): P60 Observations
  9. Swift-BAT trigger 150131 is not a GRB
  10. GRB050805b: CrAO optical limit
  11. GRB050805a : Null detection report
  12. Swift-BAT trigger 149118 is very likely not a GRB
  13. Retraction of Swift Trigger 149131 (GRB 050805B)
  14. GRB 050805b: OHP optical limits
  15. GRB 050805b: TAROT optical limits
  16. GRB050805b: MASTER optical observations
  17. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  18. GRB050805a: MASTER optical candidat
  19. Swift-BAT trigger 149118 is probably not a GRB
  20. GRB050803: Optical/UV Upper Limits from Swift-UVOT
  21. GRB 050803: Swift-BAT refined analysis
  22. GRB050803: MASTER further analys
  23. GRB 050803: early Swift XRT analysis results
  24. GRB 050803: TAROT optical limits
  25. GRB050803: MASTER optical observations
  26. GRB050803: Swift-BAT detection of a very long burst
  27. GCN GRB observation 050713A
  28. GRB 050802: Swift/UVOT optical and UV detections
  29. GRB050802 radio non-detection
  30. GRB 050730: OHP optical observations
  31. GRB 050802: early Swift XRT analysis results
  32. GRB 050802: Swift/UVOT observations
  33. GRB 050802: Swift-BAT refined analysis
  34. GRB 050802: XRT position
  35. GRB 050802: Swift Gamma-ray Burst
  36. GRB050801: Swift/UVOT Optical and UV detections
  37. GCN 050801: early Swift XRT analysis results
  38. GRB 050801: Swift-BAT refined analysis
  39. GRB 050801, afterglow observations
  40. GRB 050730, corrected photometry and break?
  41. GRB 050801: ROTSE-III Early Afterglow Break
  42. GRB050801: Swift-BAT detection of a burst
  43. GRB050801: GCN XRT position is incorrect
  44. GRB 050801: ROTSE-III Detection of Possible Counterpart
  45. GRB 050730: XRT refined analysis
  46. GRB 050730: early TAROT optical observations
  47. Swift/UVOT photometry of GRB050730
  48. GRB050730: Refined BAT analysis of the Swift-BAT burst
  49. GRB 050730: Swift XRT afterglow observations
  50. GRB 050730 XMM-Newton observation
  51. GRB050730, afterglow observations
  52. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  53. GRB050730: Liverpool Telescope optical observations
  54. GRB 050730, optical candidate
  55. GRB050730: Swift-BAT detection of a weak burst
  56. GRB 050713A: Swift XRT extended light curve
  57. GRB050726: Swift UVOT observations
  58. GRB 050724: Chandra Observations of the X-ray Afterglow
  59. GRB050713: analysis of the XMM-Newton observation
  60. Swift-BAT trigger 147918 is not a real GRB
  61. GRB 050727: RTT150 optical observations
  62. GRB050727: KAIT optical limit
  63. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  64. GRB 050726: early Swift XRT analysis results
  65. GRB050726: Swift-BAT detection of a weak burst
  66. GRB 050724: SWIFT XRT refined position
  67. GRB 050724: optical and near-IR observations
  68. GRB 050724: Swift/UVOT Upper Limit
  69. GRB 050724: early Swift XRT analysis results
  70. GRB050724: Refined analysis of the Swift-BAT possible short burst
  71. GRB050724: a short-burst detected by Swift
  72. Swift-BAT trigger 147325 is not due to a real GRB
  73. GRB050723: XRT distributed coordinates are not related to the burst
  74. GRB 050721A: Swift-BAT refined analysis
  75. GRB 050721A: Early Swift XRT analysis results
  76. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  77. GRB 050721a: Optical Observations
  78. GRB050721A: Swift-BAT detection of a weak burst
  79. GRB 050714a: Refined XRT analysis and afterglow confirmation
  80. Swift-BAT trigger 146731 is not a real GRB
  81. Swift-BAT detection of a possible GRB
  82. GRB050717
  83. Konus-Wind observation of GRB 050717
  84. Swift/UVOT Observations of GRB 050717
  85. GRB 050717: Swift-BAT refined analysis
  86. GRB 050717: Refined XRT analysis.
  87. GRB050712: optical limits
  88. GRB050717: Swift XRT position
  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. GRB050716: Refined analysis of the Swift-BAT burst
  94. GRB050716, optical observation
  95. GRB050716: Faulkes North Telescope observation
  96. GRB050716: Correction to sign in XRT coordinate
  97. Swift/BAT detection of GRB 050716
  98. GRB050715: Refined analysis of the Swift-BAT burst
  99. GRB 050715: Swift-BAT detection
  100. Swift UVOT Observations of GRB 050714B

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