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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"

28063 results found.

  1. GRB050713B :Swift/UVOT observations
  2. GRB050713b: XRT refined analysis
  3. GRB050712: TNG R-band observations
  4. GRB 050713A: Swift/UVOT observation
  5. GRB050712: Swift UVOT Observation of Afterglow Emission
  6. GRB 050713A : Lulin R-band observation
  7. GRB 050713A XMM-Newton observation
  8. GRB050713B: Faulkes North Telescope observation
  9. RBO RI observations of GRB 050713A
  10. GRB 050713B
  11. GRB050713: Liverpool Telescope prompt observations
  12. GRB050709: Candidate X-ray Afterglow from Chandra
  13. GRB 050713, R-band observations at NOT
  14. GRB050713: possible I-band afterglow
  15. GRB 050713: Swift detection of Bright Burst
  16. GRB 050713A: ROTSE-III Optical Limits
  17. GRB050712: XRT refined analysis
  18. GRB 050709: Swift UVOT and XRT observations
  19. GRB050712: UVOT candidate optical counterpart
  20. GRB 050712: Swift XRT afterglow position
  21. GRB 050712: Swift detection of a weak burst
  22. GRB050709: A Possible Short-Hard GRB Localized by HETE
  23. GRB 050525a: PROMPT VRcIc Detections
  24. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  25. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  26. GRB 050626 optical observations
  27. GRB 050626: Swift XRT observations
  28. GRB 050701
  29. GRB 050701, optical observations
  30. GRB 050408: ARC 3.5-meter NIR Observations
  31. GRB 050701: Refined XRT analysis
  32. Swift UVOT observations of GRB 050701
  33. GRB 050701: Swift XRT afterglow position
  34. Swift trigger 143708 is really GRB 050701
  35. GRB 050607, radio observations
  36. GRB 050525A: Swift Late-Time Decay Rate
  37. GRB050525a: HST Observations
  38. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  39. XRF 050509c: Optical monitoring
  40. XRF050509c: Radio Detection
  41. GRB 050416(a): Host Galaxy Redshift Determination
  42. GRB 050607: MDM Observation
  43. GRB 050607 optical decay
  44. GRB050607: refined analysis of prompt REM observations
  45. Swift/UVOT observations of GRB050607
  46. GRB 050607 : Lulin R-band observation
  47. GRB 050607: PROMPT VRcIc Observations
  48. GRB 050607: RAPTOR-S Early Optical Limits
  49. GRB050607: KAIT optical limits
  50. GRB 050525a, Mid-Infrared Observations
  51. GRB 050607: Optical decay and spectral slope
  52. GRB 050607: MDM Observations
  53. GRB 050607 - XRT refined data analysis
  54. Optical Afterglow of GRB 050607
  55. GRB050607: Swift Detection of a long GRB
  56. Limits on a SN in the field of GRB 050509b
  57. GRB 050603: Redshift
  58. GRB 050603 - XRT data analysis of the first day
  59. GRB 050603: Analysis of UVOT data
  60. GRB050603: Fading Afterglow observed by Swift UVOT
  61. GRB050603, submillimetre observations
  62. GRB 050603: Swift XRT Position
  63. GRB050603: Radio Detection
  64. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  65. GRB 050603: Afterglow Identification from LCO
  66. Swift/BAT Detection of GRB050603
  67. GRB 050408: jet break in the XRT light curve
  68. GRB 050525a, infrared observations
  69. GRB 050525a, SMARTS optical/IR afterglow observations
  70. GRB050528, XRT observations
  71. Possible GRB050528: no candidate from Liverpool Telescope
  72. Swift-BAT detection of possible GRB 050528
  73. GRB 050509b: refined XRT/Chandra afterglow position analysis
  74. GRB 050525a: SARA Observations
  75. GRB 050525: MITSuME Optical Observation in VRI
  76. GRB 050525a: MDM Observations
  77. GRB 050525 : Lulin optical afterglow observations
  78. GRB050525: Super-LOTIS observations
  79. GRB050306: optical afterglow not confirmed
  80. GRB 050525: BART optical observation
  81. GRB050525: Optical observations
  82. GRB 050525: TAROT observations of the early afterglow
  83. INTEGRAL detection of GRB 050525
  84. GRB 050525, infrared observations
  85. GRB 050525: Optical observation
  86. GRB 050525: observatons of the optical afterglow
  87. GRB050525: ROTSE-III Refined Analysis
  88. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  89. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  90. XRF050522: NIR observations of XRT candidate
  91. XRF 050522: Swift XRT refined analysis
  92. GRB 050509A: Further I-band imaging
  93. RBO Observations of GRB050522
  94. GRB050509b: optical observations
  95. GRB050520: Radio Observations
  96. XRF 050522: Swift XRT observation
  97. XRF050522, BVRcIc field photometry
  98. XRF050522: Optical Observations
  99. XRF050522: Near-infrared Observations
  100. GRB 050520: VLT/ULTRACAM observations

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