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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"

20382 results found.

  1. GRB050717: Swift XRT position
  2. Swift detection of GRB 050717
  3. Swift UVOT Observations of GRB 050716
  4. GRB 050716: Lulin B and R band optical observations
  5. GRB050716, optical observation
  6. GRB050716: Faulkes North Telescope observation
  7. Swift/BAT detection of GRB 050716
  8. Konus-Wind observation of GRB 050713A
  9. GRB 050713b: RTT150 optical observations
  10. GRB 050714B: optical afterglow
  11. GRB 050714, R-band candidate
  12. GRB 050714, optical observations
  13. GRB 050713A: RAPTOR detection of early optical emission
  14. GRB050713B :Swift/UVOT observations
  15. GRB050712: TNG R-band observations
  16. GRB 050713A: Swift/UVOT observation
  17. GRB050712: Swift UVOT Observation of Afterglow Emission
  18. GRB 050713A XMM-Newton observation
  19. GRB050713B: Faulkes North Telescope observation
  20. RBO RI observations of GRB 050713A
  21. GRB050709 : Chandra source optical counterpart
  22. GRB050713: Liverpool Telescope prompt observations
  23. GRB 050712, optical observations
  24. GRB050709: Candidate X-ray Afterglow from Chandra
  25. GRB050713: possible I-band afterglow
  26. GRB 050713A: ROTSE-III Optical Limits
  27. GRB050709: Radio Observations
  28. GRB050712: UVOT candidate optical counterpart
  29. GRB 050712: Swift detection of a weak burst
  30. GRB 050709: LCO40 Observations
  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 050408: ARC 3.5-meter NIR Observations
  37. Swift UVOT observations of GRB 050701
  38. GRB 050607, radio observations
  39. GRB050525a: HST Observations
  40. XRF 050509c: Optical monitoring
  41. XRF050509c: Radio Detection
  42. GRB 050607 optical decay
  43. GRB050607: refined analysis of prompt REM observations
  44. GRB 050607: PROMPT VRcIc Observations
  45. GRB 050607: Optical decay and spectral slope
  46. GRB050607,optical observation
  47. Optical Afterglow of GRB 050607
  48. GRB050607: Swift Detection of a long GRB
  49. GRB050607: prompt REM observations
  50. Limits on a SN in the field of GRB 050509b
  51. GRB050603, submillimetre observations
  52. GRB050603: Radio Detection
  53. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  54. GRB 050603: Afterglow Identification from LCO
  55. GRB 050603: INTEGRAL shows it is not a short GRB
  56. Swift/BAT Detection of GRB050603
  57. GRB 050525a, infrared observations
  58. GRB050528: updated Liverpool Telescope limits
  59. Swift-BAT GRB 050528: a soft burst
  60. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  61. Possible GRB050528: no candidate from Liverpool Telescope
  62. Swift-BAT detection of possible GRB 050528
  63. GRB050525a: Radio Observations
  64. GRB 050509b: refined XRT/Chandra afterglow position analysis
  65. GRB 050525: RTT150, Optical observations
  66. GRB 050525a: SARA Observations
  67. GRB 050525B: Swift-BAT observations
  68. GRB 050525: MITSuME Optical Observation in VRI
  69. GRB050525A,optical observation
  70. GRB 050525 : Lulin optical afterglow observations
  71. GRB050525: Super-LOTIS observations
  72. GRB050306: optical afterglow not confirmed
  73. GRB 050525: BART optical observation
  74. GRB 050525A: BOOTES simultaneous optical observations
  75. GRB 050525A: Swift-BAT refined analysis
  76. GRB050525: Optical observations
  77. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  78. Konus-Wind observation of GRB 050525
  79. GRB 050525: TAROT observations of the early afterglow
  80. INTEGRAL detection of GRB 050525
  81. GRB 050525, infrared observations
  82. GRB 050525: Optical observation
  83. GRB 050525: observatons of the optical afterglow
  84. GRB050525: ROTSE-III Refined Analysis
  85. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  86. XRF050522: Radio Observations
  87. Swift/UVOT observation of XRF 050522
  88. GRB 050509A: Further I-band imaging
  89. GRB050522,optical observation
  90. GRB050520,optical observation
  91. XRF 050522: Continued NIR P200 Monitoring
  92. Recent GRB BVRcIc field photometry
  93. GRB050520: Radio Observations
  94. XRF 050522: Swift XRT observation
  95. XRF050522, BVRcIc field photometry
  96. XRF050522: Optical Observations
  97. XRF050522: Near-infrared Observations
  98. GRB 050520: VLT/ULTRACAM observations
  99. GRB 050520: Swift XRT refined analysis
  100. XRF 050509c: Swift XRT Upper Limit

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