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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"

34013 results found.

  1. GRB 050714A: ROTSE-III Optical Limits
  2. GRB 050714 - A long GRB detected with INTEGRAL
  3. GRB 050713A: XRT refined analysis
  4. GRB 050709: Spectroscopy
  5. GRB 050713A: RAPTOR detection of early optical emission
  6. GRB050713B :Swift/UVOT observations
  7. GRB050712: TNG R-band observations
  8. GRB 050713B: Swift-BAT Refined Analysis
  9. Swift-BAT Trigger 145729 is not a GRB
  10. GRB 050713A: Swift/UVOT observation
  11. GRB 050713A : Swift-BAT Refined Analysis
  12. GRB 050713A : Lulin R-band observation
  13. GRB 050713A XMM-Newton observation
  14. GRB 050713b : Lulin R-band observations
  15. GRB050713B: Faulkes North Telescope observation
  16. RBO RI observations of GRB 050713A
  17. GRB 050713B
  18. GRB050709 : Chandra source optical counterpart
  19. GRB050713: Liverpool Telescope prompt observations
  20. GRB 050712, optical observations
  21. GRB 050713 : Planned XMM-Newton observation
  22. GRB050709: Candidate X-ray Afterglow from Chandra
  23. GRB 050713, R-band observations at NOT
  24. GRB 050713: ARC NIR Detections and Identification of Fading
  25. GRB050713: possible I-band afterglow
  26. GRB 050713: Swift detection of Bright Burst
  27. GRB 050713A: ROTSE-III Optical Limits
  28. GRB 050709: Swift UVOT and XRT observations
  29. GRB 050712: Swift-BAT Refined Analysis
  30. GRB 050712: Swift XRT afterglow position
  31. GRB 050712: Swift detection of a weak burst
  32. GRB 050709: LCO40 Observations
  33. GRB050709: A Possible Short-Hard GRB Localized by HETE
  34. PROMPT Rc Observations of GRB 050709
  35. GRB 050525a: PROMPT VRcIc Detections
  36. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  37. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  38. GRB 050626 optical observations
  39. GRB 050626: Swift XRT observations
  40. GRB 050701
  41. GRB 050701, optical observations
  42. GRB 050408: ARC 3.5-meter NIR Observations
  43. GRB 050701: Refined XRT analysis
  44. Swift UVOT observations of GRB 050701
  45. GRB 050701: Swift XRT afterglow position
  46. Swift trigger 143708 is really GRB 050701
  47. GRB 050607, radio observations
  48. GRB 050626 - Correction to GCN 3552
  49. GRB 050626 - a long GRB detected with INTEGRAL
  50. GRB 050525A: Swift Late-Time Decay Rate
  51. H3804: A Possible New XRB Detected by HETE
  52. XRF 050509c: Optical monitoring
  53. IBAS Alert #2512 is NOT a GRB
  54. GRB 050416(a): Host Galaxy Redshift Determination
  55. GRB 050607: MDM Observation
  56. GRB 050607 optical decay
  57. GRB 050607: RTT150 optical observations
  58. GRB 050607 : Lulin R-band observation
  59. GRB 050607: PROMPT VRcIc Observations
  60. GRB 050607: RAPTOR-S Early Optical Limits
  61. GRB 050525a, Mid-Infrared Observations
  62. GRB 050607: Optical decay and spectral slope
  63. GRB 050607: MDM Observations
  64. GRB050607,optical observation
  65. GRB 050607 - XRT refined data analysis
  66. Optical Afterglow of GRB 050607
  67. GRB050607 optical limit by "Pi of the Sky"
  68. GRB050607: Swift Detection of a long GRB
  69. GRB050607: P60 Observations
  70. GRB 050603: prediction of t_break
  71. Limits on a SN in the field of GRB 050509b
  72. GRB 050603: Redshift
  73. GRB 050603 - XRT data analysis of the first day
  74. Konus-Wind observation of GRB 050603
  75. GRB 050603: Analysis of UVOT data
  76. GRB 050603: Swift XRT Position
  77. GRB050603: Radio Detection
  78. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  79. GRB 050603: Afterglow Identification from LCO
  80. GRB 050603: INTEGRAL shows it is not a short GRB
  81. GRB 050408: jet break in the XRT light curve
  82. GRB 050525a, infrared observations
  83. GRB 050525a, SMARTS optical/IR afterglow observations
  84. Correction to GCN Circ 3502 on GRB 050528
  85. GRB050528: updated Liverpool Telescope limits
  86. Swift-BAT GRB 050528: a soft burst
  87. Update on Swift-BAT GRB 050528 (Trigger 130679)
  88. GRB050528: BOOTES optical candidate (retraction)
  89. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  90. GRB050528: BOOTES optical candidate
  91. Possible GRB050528: no candidate from Liverpool Telescope
  92. Swift-BAT detection of possible GRB 050528
  93. GRB050525a: Radio Observations
  94. GRB 050509b: refined XRT/Chandra afterglow position analysis
  95. GRB 050525: RTT150, Optical observations
  96. GRB050525a: optical upper limits
  97. GRB 050525a: SARA Observations
  98. GRB 050525B: Swift-BAT observations
  99. GRB 050525: MITSuME Optical Observation in VRI
  100. GRB 050525a: MDM Observations

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