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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"

26325 results found.

  1. GRB050716, optical observation
  2. GRB050716: Faulkes North Telescope observation
  3. GRB050715: Refined analysis of the Swift-BAT burst
  4. GRB 050715: Swift-BAT detection
  5. GRB 050713b: RTT150 optical observations
  6. GRB050714B: Refined analysis of the Swift-BAT burst
  7. GRB 050714B: optical afterglow
  8. GRB 050714, R-band candidate
  9. GRB 050714, optical observations
  10. GRB 050713A: XRT refined analysis
  11. GRB 050713A: RAPTOR detection of early optical emission
  12. GRB050713B :Swift/UVOT observations
  13. GRB050713b: XRT refined analysis
  14. GRB050712: TNG R-band observations
  15. GRB 050713B: Swift-BAT Refined Analysis
  16. GRB 050713A: Swift/UVOT observation
  17. GRB 050713A : Swift-BAT Refined Analysis
  18. GRB050712: Swift UVOT Observation of Afterglow Emission
  19. GRB 050713A : Lulin R-band observation
  20. GRB 050713A XMM-Newton observation
  21. GRB 050713b : Lulin R-band observations
  22. GRB050713B: Faulkes North Telescope observation
  23. RBO RI observations of GRB 050713A
  24. GRB 050713B
  25. GRB050709 : Chandra source optical counterpart
  26. GRB050713: Liverpool Telescope prompt observations
  27. GRB 050712, optical observations
  28. GRB050709: Candidate X-ray Afterglow from Chandra
  29. GRB050713: possible I-band afterglow
  30. GRB050712: XRT refined analysis
  31. GRB050709: Radio Observations
  32. GRB 050709: Swift UVOT and XRT observations
  33. GRB 050712: Swift-BAT Refined Analysis
  34. GRB050712: UVOT candidate optical counterpart
  35. GRB 050709: LCO40 Observations
  36. GRB050709, optical observations
  37. PROMPT Rc Observations of GRB 050709
  38. GRB 050525a: PROMPT VRcIc Detections
  39. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  40. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  41. GRB 050626: Swift XRT observations
  42. GRB 050408: ARC 3.5-meter NIR Observations
  43. GRB 050701: Refined XRT analysis
  44. Swift UVOT observations of GRB 050701
  45. GRB050701: Swift-BAT Refined analysis
  46. Swift trigger 143708 is really GRB 050701
  47. GRB 050607, radio observations
  48. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  49. GRB050525a: HST Observations
  50. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  51. XRF 050509c: Optical monitoring
  52. Konus-Wind observation of an intermediate burst from SGR 1806-20
  53. XRF050509c: Radio Detection
  54. GRB 050607 optical decay
  55. GRB050607: refined analysis of prompt REM observations
  56. GRB 050607: PROMPT VRcIc Observations
  57. GRB 050607: Optical decay and spectral slope
  58. GRB050607,optical observation
  59. Optical Afterglow of GRB 050607
  60. GRB050607: Swift Detection of a long GRB
  61. GRB050607: prompt REM observations
  62. Limits on a SN in the field of GRB 050509b
  63. GRB 050603 - XRT data analysis of the first day
  64. GRB050603, submillimetre observations
  65. GRB050603: Radio Detection
  66. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  67. GRB 050603: INTEGRAL shows it is not a short GRB
  68. GRB 050525a, infrared observations
  69. GRB050528, XRT observations
  70. GRB050528: updated Liverpool Telescope limits
  71. Swift-BAT GRB 050528: a soft burst
  72. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  73. Possible GRB050528: no candidate from Liverpool Telescope
  74. GRB050525a: Radio Observations
  75. GRB 050509b: refined XRT/Chandra afterglow position analysis
  76. GRB 050525: RTT150, Optical observations
  77. GRB 050525a: SARA Observations
  78. GRB 050525B: Swift-BAT observations
  79. GRB 050525: MITSuME Optical Observation in VRI
  80. GRB050525A,optical observation
  81. GRB050525: Super-LOTIS observations
  82. GRB 050525, spectral lag pseudo-redshift
  83. GRB050306: optical afterglow not confirmed
  84. GRB 050525: BART optical observation
  85. GRB 050525A: BOOTES simultaneous optical observations
  86. GRB 050525A: Swift-BAT refined analysis
  87. GRB050525: Optical observations
  88. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  89. Konus-Wind observation of GRB 050525
  90. GRB 050525: TAROT observations of the early afterglow
  91. INTEGRAL detection of GRB 050525
  92. GRB 050525, infrared observations
  93. GRB 050525: observatons of the optical afterglow
  94. GRB050525: ROTSE-III Refined Analysis
  95. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  96. XRF050522: Radio Observations
  97. Swift/UVOT observation of XRF 050522
  98. GRB 050509A: Further I-band imaging
  99. GRB050522,optical observation
  100. GRB050520,optical observation

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