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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"

26318 results found.

  1. GRB 050714, R-band candidate
  2. GRB 050714, optical observations
  3. GRB 050713A: XRT refined analysis
  4. GRB 050713A: RAPTOR detection of early optical emission
  5. GRB050713B :Swift/UVOT observations
  6. GRB050713b: XRT refined analysis
  7. GRB050712: TNG R-band observations
  8. GRB 050713B: Swift-BAT Refined Analysis
  9. GRB 050713A: Swift/UVOT observation
  10. GRB 050713A : Swift-BAT Refined Analysis
  11. GRB050712: Swift UVOT Observation of Afterglow Emission
  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. GRB050709: Candidate X-ray Afterglow from Chandra
  22. GRB050713: possible I-band afterglow
  23. GRB050712: XRT refined analysis
  24. GRB050709: Radio Observations
  25. GRB 050709: Swift UVOT and XRT observations
  26. GRB 050712: Swift-BAT Refined Analysis
  27. GRB050712: UVOT candidate optical counterpart
  28. GRB 050709: LCO40 Observations
  29. GRB050709, optical observations
  30. PROMPT Rc Observations of GRB 050709
  31. GRB 050525a: PROMPT VRcIc Detections
  32. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  33. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  34. GRB 050626: Swift XRT observations
  35. GRB 050408: ARC 3.5-meter NIR Observations
  36. GRB 050701: Refined XRT analysis
  37. Swift UVOT observations of GRB 050701
  38. GRB050701: Swift-BAT Refined analysis
  39. Swift trigger 143708 is really GRB 050701
  40. GRB 050607, radio observations
  41. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  42. GRB050525a: HST Observations
  43. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  44. XRF 050509c: Optical monitoring
  45. Konus-Wind observation of an intermediate burst from SGR 1806-20
  46. XRF050509c: Radio Detection
  47. GRB 050607 optical decay
  48. GRB050607: refined analysis of prompt REM observations
  49. GRB 050607: PROMPT VRcIc Observations
  50. GRB 050607: Optical decay and spectral slope
  51. GRB050607,optical observation
  52. Optical Afterglow of GRB 050607
  53. GRB050607: Swift Detection of a long GRB
  54. GRB050607: prompt REM observations
  55. Limits on a SN in the field of GRB 050509b
  56. GRB 050603 - XRT data analysis of the first day
  57. GRB050603, submillimetre observations
  58. GRB050603: Radio Detection
  59. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  60. GRB 050603: INTEGRAL shows it is not a short GRB
  61. GRB 050525a, infrared observations
  62. GRB050528, XRT observations
  63. GRB050528: updated Liverpool Telescope limits
  64. Swift-BAT GRB 050528: a soft burst
  65. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  66. Possible GRB050528: no candidate from Liverpool Telescope
  67. GRB050525a: Radio Observations
  68. GRB 050509b: refined XRT/Chandra afterglow position analysis
  69. GRB 050525: RTT150, Optical observations
  70. GRB 050525a: SARA Observations
  71. GRB 050525B: Swift-BAT observations
  72. GRB 050525: MITSuME Optical Observation in VRI
  73. GRB050525A,optical observation
  74. GRB050525: Super-LOTIS observations
  75. GRB 050525, spectral lag pseudo-redshift
  76. GRB050306: optical afterglow not confirmed
  77. GRB 050525: BART optical observation
  78. GRB 050525A: BOOTES simultaneous optical observations
  79. GRB 050525A: Swift-BAT refined analysis
  80. GRB050525: Optical observations
  81. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  82. Konus-Wind observation of GRB 050525
  83. GRB 050525: TAROT observations of the early afterglow
  84. INTEGRAL detection of GRB 050525
  85. GRB 050525, infrared observations
  86. GRB 050525: observatons of the optical afterglow
  87. GRB050525: ROTSE-III Refined Analysis
  88. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  89. XRF050522: Radio Observations
  90. Swift/UVOT observation of XRF 050522
  91. GRB 050509A: Further I-band imaging
  92. GRB050522,optical observation
  93. GRB050520,optical observation
  94. XRF 050522: Continued NIR P200 Monitoring
  95. RBO Observations of GRB050522
  96. Recent GRB BVRcIc field photometry
  97. GRB050520: Radio Observations
  98. XRF 050522: Swift XRT observation
  99. XRF050522, BVRcIc field photometry
  100. XRF050522: Optical Observations

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