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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"

26327 results found.

  1. GRB050716: Refined analysis of the Swift-BAT burst
  2. GRB 050716: Lulin B and R band optical observations
  3. GRB050716, optical observation
  4. GRB050716: Faulkes North Telescope observation
  5. GRB050715: Refined analysis of the Swift-BAT burst
  6. GRB 050715: Swift-BAT detection
  7. GRB 050713b: RTT150 optical observations
  8. GRB050714B: Refined analysis of the Swift-BAT burst
  9. GRB 050714B: optical afterglow
  10. GRB 050714, R-band candidate
  11. GRB 050714, optical observations
  12. GRB 050713A: XRT refined analysis
  13. GRB 050713A: RAPTOR detection of early optical emission
  14. GRB050713B :Swift/UVOT observations
  15. GRB050713b: XRT refined analysis
  16. GRB050712: TNG R-band observations
  17. GRB 050713B: Swift-BAT Refined Analysis
  18. GRB 050713A: Swift/UVOT observation
  19. GRB 050713A : Swift-BAT Refined Analysis
  20. GRB050712: Swift UVOT Observation of Afterglow Emission
  21. GRB 050713A : Lulin R-band observation
  22. GRB 050713A XMM-Newton observation
  23. GRB 050713b : Lulin R-band observations
  24. GRB050713B: Faulkes North Telescope observation
  25. RBO RI observations of GRB 050713A
  26. GRB 050713B
  27. GRB050709 : Chandra source optical counterpart
  28. GRB050713: Liverpool Telescope prompt observations
  29. GRB 050712, optical observations
  30. GRB050709: Candidate X-ray Afterglow from Chandra
  31. GRB050713: possible I-band afterglow
  32. GRB050712: XRT refined analysis
  33. GRB050709: Radio Observations
  34. GRB 050709: Swift UVOT and XRT observations
  35. GRB 050712: Swift-BAT Refined Analysis
  36. GRB050712: UVOT candidate optical counterpart
  37. GRB 050709: LCO40 Observations
  38. GRB050709, optical observations
  39. PROMPT Rc Observations of GRB 050709
  40. GRB 050525a: PROMPT VRcIc Detections
  41. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  42. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  43. GRB 050626: Swift XRT observations
  44. GRB 050408: ARC 3.5-meter NIR Observations
  45. GRB 050701: Refined XRT analysis
  46. Swift UVOT observations of GRB 050701
  47. GRB050701: Swift-BAT Refined analysis
  48. Swift trigger 143708 is really GRB 050701
  49. GRB 050607, radio observations
  50. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  51. GRB050525a: HST Observations
  52. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  53. XRF 050509c: Optical monitoring
  54. Konus-Wind observation of an intermediate burst from SGR 1806-20
  55. XRF050509c: Radio Detection
  56. GRB 050607 optical decay
  57. GRB050607: refined analysis of prompt REM observations
  58. GRB 050607: PROMPT VRcIc Observations
  59. GRB 050607: Optical decay and spectral slope
  60. GRB050607,optical observation
  61. Optical Afterglow of GRB 050607
  62. GRB050607: Swift Detection of a long GRB
  63. GRB050607: prompt REM observations
  64. Limits on a SN in the field of GRB 050509b
  65. GRB 050603 - XRT data analysis of the first day
  66. GRB050603, submillimetre observations
  67. GRB050603: Radio Detection
  68. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  69. GRB 050603: INTEGRAL shows it is not a short GRB
  70. GRB 050525a, infrared observations
  71. GRB050528, XRT observations
  72. GRB050528: updated Liverpool Telescope limits
  73. Swift-BAT GRB 050528: a soft burst
  74. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  75. Possible GRB050528: no candidate from Liverpool Telescope
  76. GRB050525a: Radio Observations
  77. GRB 050509b: refined XRT/Chandra afterglow position analysis
  78. GRB 050525: RTT150, Optical observations
  79. GRB 050525a: SARA Observations
  80. GRB 050525B: Swift-BAT observations
  81. GRB 050525: MITSuME Optical Observation in VRI
  82. GRB050525A,optical observation
  83. GRB050525: Super-LOTIS observations
  84. GRB 050525, spectral lag pseudo-redshift
  85. GRB050306: optical afterglow not confirmed
  86. GRB 050525: BART optical observation
  87. GRB 050525A: BOOTES simultaneous optical observations
  88. GRB 050525A: Swift-BAT refined analysis
  89. GRB050525: Optical observations
  90. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  91. Konus-Wind observation of GRB 050525
  92. GRB 050525: TAROT observations of the early afterglow
  93. INTEGRAL detection of GRB 050525
  94. GRB 050525, infrared observations
  95. GRB 050525: observatons of the optical afterglow
  96. GRB050525: ROTSE-III Refined Analysis
  97. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  98. XRF050522: Radio Observations
  99. Swift/UVOT observation of XRF 050522
  100. GRB 050509A: Further I-band imaging

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