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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"

19600 results found.

  1. GRB 050713A XMM-Newton observation
  2. GRB050713B: Faulkes North Telescope observation
  3. RBO RI observations of GRB 050713A
  4. GRB 050713B
  5. GRB050713: Liverpool Telescope prompt observations
  6. GRB050709: Candidate X-ray Afterglow from Chandra
  7. GRB 050713, R-band observations at NOT
  8. GRB 050713: Swift detection of Bright Burst
  9. GRB 050713A: ROTSE-III Optical Limits
  10. GRB050712: XRT refined analysis
  11. GRB 050709: Swift UVOT and XRT observations
  12. GRB 050712: Swift-BAT Refined Analysis
  13. GRB050712: UVOT candidate optical counterpart
  14. GRB 050712: Swift XRT afterglow position
  15. GRB 050712: Swift detection of a weak burst
  16. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  17. GRB 050626: Swift XRT observations
  18. GRB 050701
  19. GRB 050701, optical observations
  20. GRB 050701: Refined XRT analysis
  21. Swift UVOT observations of GRB 050701
  22. GRB050701: Swift-BAT Refined analysis
  23. GRB 050701: Swift XRT afterglow position
  24. Swift trigger 143708 is really GRB 050701
  25. GRB 050525A: Swift Late-Time Decay Rate
  26. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  27. GRB 050416(a): Host Galaxy Redshift Determination
  28. Swift/UVOT observations of GRB050607
  29. GRB 050607: RAPTOR-S Early Optical Limits
  30. GRB050607: KAIT optical limits
  31. GRB 050607: MDM Observations
  32. GRB050607,optical observation
  33. GRB 050607 - XRT refined data analysis
  34. GRB050607 optical limit by "Pi of the Sky"
  35. GRB050607: Swift Detection of a long GRB
  36. GRB 050603 - XRT data analysis of the first day
  37. Konus-Wind observation of GRB 050603
  38. GRB 050603: Analysis of UVOT data
  39. GRB050603: Fading Afterglow observed by Swift UVOT
  40. GRB 050603: Swift XRT Position
  41. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  42. Swift/BAT Detection of GRB050603
  43. GRB 050408: jet break in the XRT light curve
  44. GRB050528, XRT observations
  45. Correction to GCN Circ 3502 on GRB 050528
  46. Swift-BAT GRB 050528: a soft burst
  47. Update on Swift-BAT GRB 050528 (Trigger 130679)
  48. Possible GRB050528: no candidate from Liverpool Telescope
  49. Swift-BAT detection of possible GRB 050528
  50. GRB 050509b: refined XRT/Chandra afterglow position analysis
  51. GRB050525a: optical upper limits
  52. GRB 050525B: Swift-BAT observations
  53. GRB050525A,optical observation
  54. GRB050525: Super-LOTIS observations
  55. GRB 050525, spectral lag pseudo-redshift
  56. GRB050306: optical afterglow not confirmed
  57. GRB 050525A: BOOTES simultaneous optical observations
  58. GRB 050525A: Swift-BAT refined analysis
  59. Swift/UVOT UV and optical detections of GRB 050525
  60. Konus-Wind observation of GRB 050525
  61. GRB 050525: TAROT observations of the early afterglow
  62. INTEGRAL detection of GRB 050525
  63. GRB 050525: Optical observation
  64. GRB050525: ROTSE-III Refined Analysis
  65. GRB 050525 - Very Bright, Not Short
  66. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  67. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  68. XRF 050522: Swift XRT refined analysis
  69. Swift/UVOT observation of XRF 050522
  70. GRB 050509A: Further I-band imaging
  71. RBO Observations of GRB050522
  72. XRF 050522: Swift XRT observation
  73. GRB 050520: VLT/ULTRACAM observations
  74. Swift UVOT Observations of GRB 050520
  75. GRB 050520: Swift XRT refined analysis
  76. XRF050509C: Chandra Afterglow Detection
  77. XRF 050509c: Swift XRT Upper Limit
  78. RBO Observations of GRB050520
  79. GRB 050520: TAROT optical limit
  80. GRB 050520: Swift XRT position
  81. No Swift-BAT Lightcurves in real-time for next 3 weeks
  82. Swift-BAT trigger 122203 is not a real GRB
  83. GRB 050504: Swift XRT afterglow candidate has faded
  84. GRB 050509B: Subaru Optical Observations
  85. GRB050502b: Early Observation
  86. Refined Chandra analysis of GRB 050509b
  87. GRB050509b, SDSS pre-burst observations
  88. Chandra observation of GRB 050509b
  89. GRB 050509b: RAPTOR deep, early limits.
  90. GRB050509B: Optical/Infared observations
  91. GRB 050509b: Swift/UVOT follow-up measurements
  92. GRB 050509b Milagro GeV/TeV Observations
  93. GRB050509B: Optical observations at the Very Large Telescope
  94. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  95. GRB 050509a: Swift-BAT refined analysis
  96. GRB 050509B: WSRT Radio Observations
  97. GRB 050505: SARA Observations
  98. Swift UVOT Follow-up Observations of GRB 050509B
  99. GRB 050509B, Optical Observations
  100. GRB 050509B: Swift/XRT refined analysis

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