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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"

19594 results found.

  1. GRB 050713, R-band observations at NOT
  2. GRB 050713: Swift detection of Bright Burst
  3. GRB 050713A: ROTSE-III Optical Limits
  4. GRB050712: XRT refined analysis
  5. GRB 050709: Swift UVOT and XRT observations
  6. GRB 050712: Swift-BAT Refined Analysis
  7. GRB050712: UVOT candidate optical counterpart
  8. GRB 050712: Swift XRT afterglow position
  9. GRB 050712: Swift detection of a weak burst
  10. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  11. GRB 050626: Swift XRT observations
  12. GRB 050701
  13. GRB 050701, optical observations
  14. GRB 050701: Refined XRT analysis
  15. Swift UVOT observations of GRB 050701
  16. GRB050701: Swift-BAT Refined analysis
  17. GRB 050701: Swift XRT afterglow position
  18. Swift trigger 143708 is really GRB 050701
  19. GRB 050525A: Swift Late-Time Decay Rate
  20. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  21. GRB 050416(a): Host Galaxy Redshift Determination
  22. Swift/UVOT observations of GRB050607
  23. GRB 050607: RAPTOR-S Early Optical Limits
  24. GRB050607: KAIT optical limits
  25. GRB 050607: MDM Observations
  26. GRB050607,optical observation
  27. GRB 050607 - XRT refined data analysis
  28. GRB050607 optical limit by "Pi of the Sky"
  29. GRB050607: Swift Detection of a long GRB
  30. GRB 050603 - XRT data analysis of the first day
  31. Konus-Wind observation of GRB 050603
  32. GRB 050603: Analysis of UVOT data
  33. GRB050603: Fading Afterglow observed by Swift UVOT
  34. GRB 050603: Swift XRT Position
  35. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  36. Swift/BAT Detection of GRB050603
  37. GRB 050408: jet break in the XRT light curve
  38. GRB050528, XRT observations
  39. Correction to GCN Circ 3502 on GRB 050528
  40. Swift-BAT GRB 050528: a soft burst
  41. Update on Swift-BAT GRB 050528 (Trigger 130679)
  42. Possible GRB050528: no candidate from Liverpool Telescope
  43. Swift-BAT detection of possible GRB 050528
  44. GRB 050509b: refined XRT/Chandra afterglow position analysis
  45. GRB050525a: optical upper limits
  46. GRB 050525B: Swift-BAT observations
  47. GRB050525A,optical observation
  48. GRB050525: Super-LOTIS observations
  49. GRB 050525, spectral lag pseudo-redshift
  50. GRB050306: optical afterglow not confirmed
  51. GRB 050525A: BOOTES simultaneous optical observations
  52. GRB 050525A: Swift-BAT refined analysis
  53. Swift/UVOT UV and optical detections of GRB 050525
  54. Konus-Wind observation of GRB 050525
  55. GRB 050525: TAROT observations of the early afterglow
  56. INTEGRAL detection of GRB 050525
  57. GRB 050525: Optical observation
  58. GRB050525: ROTSE-III Refined Analysis
  59. GRB 050525 - Very Bright, Not Short
  60. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  61. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  62. XRF 050522: Swift XRT refined analysis
  63. Swift/UVOT observation of XRF 050522
  64. GRB 050509A: Further I-band imaging
  65. RBO Observations of GRB050522
  66. XRF 050522: Swift XRT observation
  67. GRB 050520: VLT/ULTRACAM observations
  68. Swift UVOT Observations of GRB 050520
  69. GRB 050520: Swift XRT refined analysis
  70. XRF050509C: Chandra Afterglow Detection
  71. XRF 050509c: Swift XRT Upper Limit
  72. RBO Observations of GRB050520
  73. GRB 050520: TAROT optical limit
  74. GRB 050520: Swift XRT position
  75. No Swift-BAT Lightcurves in real-time for next 3 weeks
  76. Swift-BAT trigger 122203 is not a real GRB
  77. GRB 050504: Swift XRT afterglow candidate has faded
  78. GRB 050509B: Subaru Optical Observations
  79. GRB050502b: Early Observation
  80. Refined Chandra analysis of GRB 050509b
  81. GRB050509b, SDSS pre-burst observations
  82. Chandra observation of GRB 050509b
  83. GRB 050509b: RAPTOR deep, early limits.
  84. GRB050509B: Optical/Infared observations
  85. GRB 050509b: Swift/UVOT follow-up measurements
  86. GRB 050509b Milagro GeV/TeV Observations
  87. GRB050509B: Optical observations at the Very Large Telescope
  88. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  89. GRB 050509a: Swift-BAT refined analysis
  90. GRB 050509B: WSRT Radio Observations
  91. GRB 050505: SARA Observations
  92. Swift UVOT Follow-up Observations of GRB 050509B
  93. GRB 050509B, Optical Observations
  94. GRB 050509B: Swift/XRT refined analysis
  95. GRB050509a: Swift UVOT observations
  96. GRB 050509b: Optical observations
  97. GRB 050509b: Possible Optical Counterpart
  98. GRB 050509A: Optical observations
  99. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  100. GRB 050509b: optical observations

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