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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"

20411 results found.

  1. GRB 050730, corrected photometry and break?
  2. GRB 050730: early TAROT optical observations
  3. GRB 050730, spectra and optical photometry
  4. GRB 050730 XMM-Newton observation
  5. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  6. GRB050730: Swift-BAT detection of a weak burst
  7. GRB 050713A: Swift XRT extended light curve
  8. GRB 050724: WHT optical observations
  9. GRB050713: analysis of the XMM-Newton observation
  10. GRB050709: Second Epoch Chandra Observation
  11. GRB050709: Second Epoch Chandra Observation
  12. GRB 050724: Optical Variability in Nearby Galaxy
  13. GRB 050724: J-band observations
  14. GRB 050724: GMOS Imaging and Spectroscopy
  15. GRB050724: Radio Observation
  16. GRB 050724: Swift/UVOT Upper Limit
  17. GRB 050724: possible host galaxy in DSS
  18. GRB050721A: optical decay
  19. GRB 050721: optical afterglow confirmed
  20. GRB050714b: Radio Observation
  21. GRB050712: Radio Observations
  22. GRB050713a: Radio Observation
  23. GRB 050712, Tautenburg optical afterglow observations
  24. Swift-BAT detection of a possible GRB
  25. GRB 050714B: VLT R-band observations
  26. GRB 050717: Additional LCO observations
  27. GRB 050716; J-band observations
  28. GRB 050717: LCO near-IR observations
  29. Swift/UVOT Observations of GRB 050717
  30. GRB050717: Swift XRT position
  31. Swift detection of GRB 050717
  32. Swift UVOT Observations of GRB 050716
  33. GRB 050716: Lulin B and R band optical observations
  34. GRB050716, optical observation
  35. GRB050716: Faulkes North Telescope observation
  36. Swift/BAT detection of GRB 050716
  37. Konus-Wind observation of GRB 050713A
  38. GRB 050713b: RTT150 optical observations
  39. GRB 050714B: optical afterglow
  40. GRB 050714, R-band candidate
  41. GRB 050714, optical observations
  42. GRB 050713A: RAPTOR detection of early optical emission
  43. GRB050713B :Swift/UVOT observations
  44. GRB050712: TNG R-band observations
  45. GRB 050713A: Swift/UVOT observation
  46. GRB050712: Swift UVOT Observation of Afterglow Emission
  47. GRB 050713A XMM-Newton observation
  48. GRB050713B: Faulkes North Telescope observation
  49. RBO RI observations of GRB 050713A
  50. GRB050709 : Chandra source optical counterpart
  51. GRB050713: Liverpool Telescope prompt observations
  52. GRB 050712, optical observations
  53. GRB050709: Candidate X-ray Afterglow from Chandra
  54. GRB050713: possible I-band afterglow
  55. GRB 050713A: ROTSE-III Optical Limits
  56. GRB050709: Radio Observations
  57. GRB050712: UVOT candidate optical counterpart
  58. GRB 050712: Swift detection of a weak burst
  59. GRB 050709: LCO40 Observations
  60. PROMPT Rc Observations of GRB 050709
  61. GRB 050525a: PROMPT VRcIc Detections
  62. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  63. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  64. GRB 050626 optical observations
  65. GRB 050408: ARC 3.5-meter NIR Observations
  66. Swift UVOT observations of GRB 050701
  67. GRB 050607, radio observations
  68. GRB050525a: HST Observations
  69. XRF 050509c: Optical monitoring
  70. XRF050509c: Radio Detection
  71. GRB 050607 optical decay
  72. GRB050607: refined analysis of prompt REM observations
  73. GRB 050607: PROMPT VRcIc Observations
  74. GRB 050607: Optical decay and spectral slope
  75. GRB050607,optical observation
  76. Optical Afterglow of GRB 050607
  77. GRB050607: Swift Detection of a long GRB
  78. GRB050607: prompt REM observations
  79. Limits on a SN in the field of GRB 050509b
  80. GRB050603, submillimetre observations
  81. GRB050603: Radio Detection
  82. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  83. GRB 050603: Afterglow Identification from LCO
  84. GRB 050603: INTEGRAL shows it is not a short GRB
  85. Swift/BAT Detection of GRB050603
  86. GRB 050525a, infrared observations
  87. GRB050528: updated Liverpool Telescope limits
  88. Swift-BAT GRB 050528: a soft burst
  89. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  90. Possible GRB050528: no candidate from Liverpool Telescope
  91. Swift-BAT detection of possible GRB 050528
  92. GRB050525a: Radio Observations
  93. GRB 050509b: refined XRT/Chandra afterglow position analysis
  94. GRB 050525: RTT150, Optical observations
  95. GRB 050525a: SARA Observations
  96. GRB 050525B: Swift-BAT observations
  97. GRB 050525: MITSuME Optical Observation in VRI
  98. GRB050525A,optical observation
  99. GRB 050525 : Lulin optical afterglow observations
  100. GRB050525: Super-LOTIS observations

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