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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"

41879 results found.

  1. GRB050803: MASTER optical observations
  2. GRB050802: Tentative absorption redshift
  3. GRB050803: Swift-BAT detection of a very long burst
  4. GCN GRB observation 050713A
  5. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  6. GRB 050802: Swift/UVOT optical and UV detections
  7. GRB050802: CrAO optical observations
  8. GRB050801: Unchanged decay slope
  9. GRB050802 radio non-detection
  10. GRB 050730: OHP optical observations
  11. GRB 050802: early Swift XRT analysis results
  12. GRB 050802: Swift/UVOT observations
  13. GRB 050802 : Lulin Optical follow-up observation
  14. GRB050801: Optical photometry and decay index
  15. GRB 050802: XRT position
  16. GRB 050802: Swift Gamma-ray Burst
  17. GRB050801: Swift/UVOT Optical and UV detections
  18. GRB 050730: Preliminary Analysis of MIKE Spectrum
  19. GCN 050801: early Swift XRT analysis results
  20. GRB 050801, SMARTS optical/IR afterglow observations
  21. GRB 050801, afterglow observations
  22. GRB 050730, corrected photometry and break?
  23. GRB 050801: ROTSE-III Early Afterglow Break
  24. GRB050801: Swift-BAT detection of a burst
  25. GRB 050801: ROTSE-III Detection of Possible Counterpart
  26. GRB 050730: XRT refined analysis
  27. Correction to GCN Circ 3476 on GRB050525A
  28. GRB 050730: early TAROT optical observations
  29. GRB 050726: PROMPT Rc Observations
  30. GRB 050730: RTT150 optical observations
  31. Swift/UVOT photometry of GRB050730
  32. GRB 050730, spectra and optical photometry
  33. GRB050730: Refined BAT analysis of the Swift-BAT burst
  34. GRB 050730: Swift XRT afterglow observations
  35. GRB 050730: PROMPT VRcIc Observations
  36. GRB050730, afterglow observations
  37. GRB050730: confirmation of redshift
  38. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  39. GRB 050730, SMARTS optical/IR afterglow observations
  40. GRB050730: Liverpool Telescope optical observations
  41. GRB 050730, optical candidate
  42. GRB050730: Swift-BAT detection of a weak burst
  43. GRB 050713A: Swift XRT extended light curve
  44. GRB 050709: PROMPT Rc Observations
  45. GRB050713b: Maidanak optical observations
  46. GRB 050724: WHT optical observations
  47. GRB050726: Swift UVOT observations
  48. GRB 050724: Chandra Observations of the X-ray Afterglow
  49. GRB050724: Refined Radio Position
  50. GRB050713: analysis of the XMM-Newton observation
  51. GRB 050724, SMARTS optical/IR afterglow observations
  52. GRB 050726, SMARTS optical/IR observations
  53. Swift-BAT trigger 147918 is not a real GRB
  54. GRB 050727: RTT150 optical observations
  55. GRB050724: VLT observations of the variable source
  56. GRB050727: KAIT optical limit
  57. GRB050709: Second Epoch Chandra Observation
  58. GRB 050726: PROMPT Rc Observations
  59. GRB050709: Second Epoch Chandra Observation
  60. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  61. GRB050724: Further Radio Observations
  62. GRB 050726: early Swift XRT analysis results
  63. GRB050726: Swift-BAT detection of a weak burst
  64. GRB 050724: Optical Variability in Nearby Galaxy
  65. GRB 050724: J-band observations
  66. GRB 050724: GMOS Imaging and Spectroscopy
  67. GRB 050724: SWIFT XRT refined position
  68. RXTE ASM Detection of GRB050724
  69. GRB050724: Radio Observation
  70. GRB 050724: spectroscopy of object in the XRT error circle
  71. GRB 050724: optical and near-IR observations
  72. GRB 050724: Optical imaging/astrometry
  73. GRB 050724: RTT150 optical observations
  74. GRB 050724: Swift/UVOT Upper Limit
  75. GRB 050724: early Swift XRT analysis results
  76. GRB 050724 : Lulin early R-band monitoring observations
  77. GRB050724: Refined analysis of the Swift-BAT possible short burst
  78. GRB 050724: possible host galaxy in DSS
  79. GRB050724: a short-burst detected by Swift
  80. GRB050723: XRT distributed coordinates are not related to the burst
  81. GRB 050721: early afterglow light curve
  82. GRB 050721A: Swift-BAT refined analysis
  83. GRB 050721A: Early Swift XRT analysis results
  84. GRB050721A: optical decay
  85. GRB 050721: optical afterglow confirmed
  86. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  87. GRB 050721a: Optical Observations
  88. GRB050721A: Swift-BAT detection of a weak burst
  89. GRB 050709: Refined Spectral and Temporal Properties
  90. GRB 050717: PROMPT RcIc Observations
  91. GRB050714b: Radio Observation
  92. GRB050712: Radio Observations
  93. GRB 050714a: Refined XRT analysis and afterglow confirmation
  94. GRB050713a: Radio Observation
  95. GRB 050712, Tautenburg optical afterglow observations
  96. Swift-BAT detection of a possible GRB
  97. GRB 050714B: VLT R-band observations
  98. GRB 050717: Additional LCO observations
  99. GRB050717
  100. GRB 050716; J-band observations

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