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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').
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"

22912 results found.

  1. GRB050801: Radio Observation
  2. GRB050730: Radio Detection
  3. GRB050803: CrAO optical observations, possible OT candidate
  4. GRB050803: Optical/UV Upper Limits from Swift-UVOT
  5. GRB 050803: Keck Observations
  6. GRB 050803: Swift-BAT refined analysis
  7. GRB 050802.422: Fading of the afterglow and detection of the host
  8. GRB 050803, optical observations
  9. GRB 050803: early Swift XRT analysis results
  10. GRB 050803: TAROT optical limits
  11. GRB050803: Swift-BAT detection of a very long burst
  12. GCN GRB observation 050713A
  13. GRB 050802: Swift/UVOT optical and UV detections
  14. GRB050802 radio non-detection
  15. GRB 050730: OHP optical observations
  16. GRB 050802: Swift/UVOT observations
  17. GRB 050802 : Lulin Optical follow-up observation
  18. GRB 050802: Swift-BAT refined analysis
  19. GRB050801: Optical photometry and decay index
  20. GRB 050802: Swift Gamma-ray Burst
  21. GCN 050801: early Swift XRT analysis results
  22. GRB 050801: Swift-BAT refined analysis
  23. GRB050801: Swift-BAT detection of a burst
  24. GRB 050730: early TAROT optical observations
  25. GRB 050726: PROMPT Rc Observations
  26. Swift/UVOT photometry of GRB050730
  27. GRB 050730, spectra and optical photometry
  28. GRB050730: Refined BAT analysis of the Swift-BAT burst
  29. GRB 050730: Swift XRT afterglow observations
  30. GRB 050730 XMM-Newton observation
  31. GRB 050730: PROMPT VRcIc Observations
  32. GRB050730: Swift-BAT detection of a weak burst
  33. GRB 050709: PROMPT Rc Observations
  34. GRB 050724: Secure Host Redshift from Keck
  35. GRB050726: Swift UVOT observations
  36. GRB 050724: Chandra Observations of the X-ray Afterglow
  37. GRB050713: analysis of the XMM-Newton observation
  38. GRB050709: Second Epoch Chandra Observation
  39. GRB050709: Second Epoch Chandra Observation
  40. GRB 050726: early Swift XRT analysis results
  41. GRB050726: Swift-BAT detection of a weak burst
  42. GRB 050724: Optical Variability in Nearby Galaxy
  43. GRB 050724: J-band observations
  44. GRB 050724: GMOS Imaging and Spectroscopy
  45. GRB 050724: SWIFT XRT refined position
  46. RXTE ASM Detection of GRB050724
  47. GRB050724: Radio Observation
  48. GRB 050724: Optical limit
  49. GRB 050724: Swift/UVOT Upper Limit
  50. GRB050724: Refined analysis of the Swift-BAT possible short burst
  51. GRB 050724: possible host galaxy in DSS
  52. GRB050724: a short-burst detected by Swift
  53. GRB 050721A: Swift-BAT refined analysis
  54. GRB050721A: optical decay
  55. GRB 050721: optical afterglow confirmed
  56. GRB050721A: Swift-BAT detection of a weak burst
  57. GRB 050717: PROMPT RcIc Observations
  58. GRB050714b: Radio Observation
  59. GRB050712: Radio Observations
  60. GRB050713a: Radio Observation
  61. Swift-BAT trigger 146731 is not a real GRB
  62. GRB 050712, Tautenburg optical afterglow observations
  63. Swift-BAT detection of a possible GRB
  64. GRB 050714B: VLT R-band observations
  65. GRB 050717: Additional LCO observations
  66. GRB 050716; J-band observations
  67. GRB 050717: LCO near-IR observations
  68. Swift/UVOT Observations of GRB 050717
  69. GRB 050717: Swift-BAT refined analysis
  70. GRB050717: Swift XRT position
  71. Swift detection of GRB 050717
  72. Swift UVOT Observations of GRB 050716
  73. GRB050716: Refined analysis of the Swift-BAT burst
  74. GRB 050716: Lulin B and R band optical observations
  75. GRB050716, optical observation
  76. GRB 050716: Optical Observations
  77. GRB050716: Faulkes North Telescope observation
  78. GRB050715: Refined analysis of the Swift-BAT burst
  79. GRB 050715: Swift-BAT detection
  80. GRB 050713b: RTT150 optical observations
  81. GRB 050714B: optical afterglow
  82. Swift detection of a long transient (GRB 050714B?)
  83. GRB 050714, R-band candidate
  84. GRB 050714, optical observations
  85. GRB 050714A: ROTSE-III Optical Limits
  86. GRB 050713A: XRT refined analysis
  87. GRB 050709: Spectroscopy
  88. GRB 050713A: RAPTOR detection of early optical emission
  89. GRB050713B :Swift/UVOT observations
  90. GRB050712: TNG R-band observations
  91. GRB 050713B: Swift-BAT Refined Analysis
  92. GRB 050713A: Swift/UVOT observation
  93. GRB 050713A : Swift-BAT Refined Analysis
  94. GRB050712: Swift UVOT Observation of Afterglow Emission
  95. GRB 050713A XMM-Newton observation
  96. GRB050713B: Faulkes North Telescope observation
  97. GRB 050713B
  98. GRB050709 : Chandra source optical counterpart
  99. GRB050713: Liverpool Telescope prompt observations
  100. GRB 050712, optical observations

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