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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"

45450 results found.

  1. Swift-BAT Trigger 145729 is not a GRB
  2. GRB 050713A: Swift/UVOT observation
  3. GRB 050713A : Swift-BAT Refined Analysis
  4. GRB050712: Swift UVOT Observation of Afterglow Emission
  5. GRB 050713A : Lulin R-band observation
  6. GRB 050713A XMM-Newton observation
  7. GRB 050713b : Lulin R-band observations
  8. GRB050713B: Faulkes North Telescope observation
  9. RBO RI observations of GRB 050713A
  10. GRB 050713B
  11. GRB050709 : Chandra source optical counterpart
  12. GRB050713: Liverpool Telescope prompt observations
  13. GRB 050712, optical observations
  14. GRB 050713 : Planned XMM-Newton observation
  15. GRB050709: Candidate X-ray Afterglow from Chandra
  16. GRB 050713, R-band observations at NOT
  17. GRB 050713: ARC NIR Detections and Identification of Fading
  18. GRB050713: possible I-band afterglow
  19. GRB 050713: Swift detection of Bright Burst
  20. GRB 050713A: ROTSE-III Optical Limits
  21. GRB050712: XRT refined analysis
  22. GRB050709: Radio Observations
  23. GRB 050709: Swift UVOT and XRT observations
  24. GRB 050712: Swift-BAT Refined Analysis
  25. GRB050712: UVOT candidate optical counterpart
  26. GRB 050712: Swift XRT afterglow position
  27. GRB 050712: Swift detection of a weak burst
  28. GRB 050709: LCO40 Observations
  29. GRB050709, optical observations
  30. GRB050709: A Possible Short-Hard GRB Localized by HETE
  31. PROMPT Rc Observations of GRB 050709
  32. GRB 050525a: PROMPT VRcIc Detections
  33. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  34. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  35. GRB 050626 optical observations
  36. GRB 050626: Swift XRT observations
  37. GRB 050701
  38. GRB 050701, optical observations
  39. GRB 050408: ARC 3.5-meter NIR Observations
  40. GRB 050701: Refined XRT analysis
  41. Swift UVOT observations of GRB 050701
  42. GRB050701: Swift-BAT Refined analysis
  43. GRB 050701: Swift XRT afterglow position
  44. Swift trigger 143708 is really GRB 050701
  45. GRB 050607, radio observations
  46. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  47. GRB 050626 - Correction to GCN 3552
  48. GRB 050626 - a long GRB detected with INTEGRAL
  49. GRB 050525A: Swift Late-Time Decay Rate
  50. GRB050525a: HST Observations
  51. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  52. H3804: A Possible New XRB Detected by HETE
  53. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  54. XRF 050509c: Optical monitoring
  55. Konus-Wind observation of an intermediate burst from SGR 1806-20
  56. IBAS Alert #2512 is NOT a GRB
  57. XRF050509c: Radio Detection
  58. GRB 050416(a): Host Galaxy Redshift Determination
  59. GRB 050607: MDM Observation
  60. GRB 050607 optical decay
  61. GRB 050607: RTT150 optical observations
  62. GRB050607: refined analysis of prompt REM observations
  63. Swift/UVOT observations of GRB050607
  64. GRB 050607 : Lulin R-band observation
  65. GRB 050607: PROMPT VRcIc Observations
  66. GRB 050607: RAPTOR-S Early Optical Limits
  67. GRB050607: KAIT optical limits
  68. GRB 050525a, Mid-Infrared Observations
  69. GRB 050607: Optical decay and spectral slope
  70. GRB 050607: MDM Observations
  71. GRB050607,optical observation
  72. GRB 050607 - XRT refined data analysis
  73. Optical Afterglow of GRB 050607
  74. GRB050607 optical limit by "Pi of the Sky"
  75. GRB050607: Swift Detection of a long GRB
  76. GRB050607: P60 Observations
  77. GRB050607: prompt REM observations
  78. GRB 050603: prediction of t_break
  79. Limits on a SN in the field of GRB 050509b
  80. GRB 050603: Redshift
  81. GRB 050603 - XRT data analysis of the first day
  82. Konus-Wind observation of GRB 050603
  83. GRB 050603: Analysis of UVOT data
  84. GRB050603: Fading Afterglow observed by Swift UVOT
  85. GRB050603, submillimetre observations
  86. GRB 050603: Swift XRT Position
  87. GRB050603: Radio Detection
  88. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  89. GRB 050603: Afterglow Identification from LCO
  90. GRB 050603: INTEGRAL shows it is not a short GRB
  91. Swift/BAT Detection of GRB050603
  92. GRB 050408: jet break in the XRT light curve
  93. GRB 050525a, infrared observations
  94. GRB 050525a, SMARTS optical/IR afterglow observations
  95. GRB050528, XRT observations
  96. Correction to GCN Circ 3502 on GRB 050528
  97. GRB050528: updated Liverpool Telescope limits
  98. Swift-BAT GRB 050528: a soft burst
  99. Update on Swift-BAT GRB 050528 (Trigger 130679)
  100. GRB050528: BOOTES optical candidate (retraction)

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