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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"

45461 results found.

  1. GRB 050714, R-band candidate
  2. GRB 050714: Swift XRT afterglow position
  3. GRB 050714, optical observations
  4. GRB 050714A: ROTSE-III Optical Limits
  5. GRB 050714 - A long GRB detected with INTEGRAL
  6. GRB 050713A: XRT refined analysis
  7. GRB 050709: Spectroscopy
  8. GRB 050713A: RAPTOR detection of early optical emission
  9. GRB050713B :Swift/UVOT observations
  10. GRB050713b: XRT refined analysis
  11. GRB050712: TNG R-band observations
  12. GRB 050713B: Swift-BAT Refined Analysis
  13. Swift-BAT Trigger 145729 is not a GRB
  14. GRB 050713A: Swift/UVOT observation
  15. GRB 050713A : Swift-BAT Refined Analysis
  16. GRB050712: Swift UVOT Observation of Afterglow Emission
  17. GRB 050713A : Lulin R-band observation
  18. GRB 050713A XMM-Newton observation
  19. GRB 050713b : Lulin R-band observations
  20. GRB050713B: Faulkes North Telescope observation
  21. RBO RI observations of GRB 050713A
  22. GRB 050713B
  23. GRB050709 : Chandra source optical counterpart
  24. GRB050713: Liverpool Telescope prompt observations
  25. GRB 050712, optical observations
  26. GRB 050713 : Planned XMM-Newton observation
  27. GRB050709: Candidate X-ray Afterglow from Chandra
  28. GRB 050713, R-band observations at NOT
  29. GRB 050713: ARC NIR Detections and Identification of Fading
  30. GRB050713: possible I-band afterglow
  31. GRB 050713: Swift detection of Bright Burst
  32. GRB 050713A: ROTSE-III Optical Limits
  33. GRB050712: XRT refined analysis
  34. GRB050709: Radio Observations
  35. GRB 050709: Swift UVOT and XRT observations
  36. GRB 050712: Swift-BAT Refined Analysis
  37. GRB050712: UVOT candidate optical counterpart
  38. GRB 050712: Swift XRT afterglow position
  39. GRB 050712: Swift detection of a weak burst
  40. GRB 050709: LCO40 Observations
  41. GRB050709, optical observations
  42. GRB050709: A Possible Short-Hard GRB Localized by HETE
  43. PROMPT Rc Observations of GRB 050709
  44. GRB 050525a: PROMPT VRcIc Detections
  45. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  46. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  47. GRB 050626 optical observations
  48. GRB 050626: Swift XRT observations
  49. GRB 050701
  50. GRB 050701, optical observations
  51. GRB 050408: ARC 3.5-meter NIR Observations
  52. GRB 050701: Refined XRT analysis
  53. Swift UVOT observations of GRB 050701
  54. GRB050701: Swift-BAT Refined analysis
  55. GRB 050701: Swift XRT afterglow position
  56. Swift trigger 143708 is really GRB 050701
  57. GRB 050607, radio observations
  58. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  59. GRB 050626 - Correction to GCN 3552
  60. GRB 050626 - a long GRB detected with INTEGRAL
  61. GRB 050525A: Swift Late-Time Decay Rate
  62. GRB050525a: HST Observations
  63. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  64. H3804: A Possible New XRB Detected by HETE
  65. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  66. XRF 050509c: Optical monitoring
  67. Konus-Wind observation of an intermediate burst from SGR 1806-20
  68. IBAS Alert #2512 is NOT a GRB
  69. XRF050509c: Radio Detection
  70. GRB 050416(a): Host Galaxy Redshift Determination
  71. GRB 050607: MDM Observation
  72. GRB 050607 optical decay
  73. GRB 050607: RTT150 optical observations
  74. GRB050607: refined analysis of prompt REM observations
  75. Swift/UVOT observations of GRB050607
  76. GRB 050607 : Lulin R-band observation
  77. GRB 050607: PROMPT VRcIc Observations
  78. GRB 050607: RAPTOR-S Early Optical Limits
  79. GRB050607: KAIT optical limits
  80. GRB 050525a, Mid-Infrared Observations
  81. GRB 050607: Optical decay and spectral slope
  82. GRB 050607: MDM Observations
  83. GRB050607,optical observation
  84. GRB 050607 - XRT refined data analysis
  85. Optical Afterglow of GRB 050607
  86. GRB050607 optical limit by "Pi of the Sky"
  87. GRB050607: Swift Detection of a long GRB
  88. GRB050607: P60 Observations
  89. GRB050607: prompt REM observations
  90. GRB 050603: prediction of t_break
  91. Limits on a SN in the field of GRB 050509b
  92. GRB 050603: Redshift
  93. GRB 050603 - XRT data analysis of the first day
  94. Konus-Wind observation of GRB 050603
  95. GRB 050603: Analysis of UVOT data
  96. GRB050603: Fading Afterglow observed by Swift UVOT
  97. GRB050603, submillimetre observations
  98. GRB 050603: Swift XRT Position
  99. GRB050603: Radio Detection
  100. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst

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