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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"

36212 results found.

  1. GRB 050802: Swift Gamma-ray Burst
  2. GRB 050730: Preliminary Analysis of MIKE Spectrum
  3. GCN 050801: early Swift XRT analysis results
  4. GRB 050801: Swift-BAT refined analysis
  5. GRB 050801, SMARTS optical/IR afterglow observations
  6. GRB 050801, afterglow observations
  7. GRB 050730, corrected photometry and break?
  8. GRB 050801: ROTSE-III Early Afterglow Break
  9. GRB050801: Swift-BAT detection of a burst
  10. GRB 050801: ROTSE-III Detection of Possible Counterpart
  11. GRB 050730: XRT refined analysis
  12. Correction to GCN Circ 3476 on GRB050525A
  13. GRB 050730: early TAROT optical observations
  14. GRB 050726: PROMPT Rc Observations
  15. GRB 050730: RTT150 optical observations
  16. GRB 050730, spectra and optical photometry
  17. GRB050730: Refined BAT analysis of the Swift-BAT burst
  18. GRB 050730: Swift XRT afterglow observations
  19. GRB 050730 XMM-Newton observation
  20. GRB 050730: PROMPT VRcIc Observations
  21. GRB050730, afterglow observations
  22. GRB050730: confirmation of redshift
  23. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  24. GRB 050730, SMARTS optical/IR afterglow observations
  25. GRB 050730 : Planned XMM-Newton observation
  26. GRB050730: Liverpool Telescope optical observations
  27. GRB 050730, optical candidate
  28. GRB050730: Swift-BAT detection of a weak burst
  29. GRB 050713A: Swift XRT extended light curve
  30. GRB 050709: PROMPT Rc Observations
  31. GRB050713b: Maidanak optical observations
  32. GRB 050724: Secure Host Redshift from Keck
  33. GRB 050724: WHT optical observations
  34. GRB 050724: Chandra Observations of the X-ray Afterglow
  35. GRB050713: analysis of the XMM-Newton observation
  36. GRB 050724, SMARTS optical/IR afterglow observations
  37. GRB 050726, SMARTS optical/IR observations
  38. Swift-BAT trigger 147918 is not a real GRB
  39. GRB 050727: RTT150 optical observations
  40. GRB050727: KAIT optical limit
  41. GRB050709: Second Epoch Chandra Observation
  42. GRB 050726: PROMPT Rc Observations
  43. GRB050709: Second Epoch Chandra Observation
  44. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  45. GRB 050726: early Swift XRT analysis results
  46. GRB 050724: Optical Variability in Nearby Galaxy
  47. GRB 050724: J-band observations
  48. GRB 050724: GMOS Imaging and Spectroscopy
  49. GRB 050724: SWIFT XRT refined position
  50. GRB 050724: spectroscopy of object in the XRT error circle
  51. GRB 050724: Optical limit
  52. GRB 050724: optical and near-IR observations
  53. GRB 050724: Optical imaging/astrometry
  54. GRB 050724: RTT150 optical observations
  55. GRB 050724: Swift/UVOT Upper Limit
  56. GRB 050724: early Swift XRT analysis results
  57. GRB 050724 : Lulin early R-band monitoring observations
  58. GRB050724: Refined analysis of the Swift-BAT possible short burst
  59. GRB 050724: possible host galaxy in DSS
  60. Swift-BAT trigger 147325 is not due to a real GRB
  61. GRB050723: XRT distributed coordinates are not related to the burst
  62. GRB 050721: early afterglow light curve
  63. GRB 050721A: Swift-BAT refined analysis
  64. Correction to GCN Circ 3474 on GRB050525A
  65. GRB 050721A: Early Swift XRT analysis results
  66. GRB050721A: optical decay
  67. GRB 050721: optical afterglow confirmed
  68. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  69. GRB 050721a: Optical Observations
  70. GRB 050709: Refined Spectral and Temporal Properties
  71. GRB 050717: PROMPT RcIc Observations
  72. GRB 050714a: Refined XRT analysis and afterglow confirmation
  73. Swift-BAT trigger 146731 is not a real GRB
  74. GRB 050712, Tautenburg optical afterglow observations
  75. Swift-BAT detection of a possible GRB
  76. GRB 050714B: VLT R-band observations
  77. GRB 050717: Additional LCO observations
  78. GRB050717
  79. GRB 050716; J-band observations
  80. Konus-Wind observation of GRB 050717
  81. GRB 050717: LCO near-IR observations
  82. Swift/UVOT Observations of GRB 050717
  83. GRB 050717: Swift-BAT refined analysis
  84. GRB 050717: Refined XRT analysis.
  85. GRB050712: optical limits
  86. Swift detection of GRB 050717
  87. GRB 050716 - UKIRT identification of candidate afterglow
  88. Swift UVOT Observations of GRB 050716
  89. GRB 050716: Refined XRT analysis.
  90. GRB 050716: Lulin B and R band optical observations
  91. GRB050716, optical observation
  92. GRB 050716: Optical Observations
  93. GRB050716: Faulkes North Telescope observation
  94. Swift/BAT detection of GRB 050716
  95. GRB 050715: Swift-BAT detection
  96. Swift UVOT Observations of GRB 050714B
  97. Konus-Wind observation of GRB 050713A
  98. GRB 050714B: refined XRT analysis
  99. GRB 050713b: RTT150 optical observations
  100. GRB 050714B: candidate afterglow does not fade

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