Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. See news and announcements

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"

26341 results found.

  1. GRB050712: Radio Observations
  2. GRB050713a: Radio Observation
  3. GRB 050712, Tautenburg optical afterglow observations
  4. Swift-BAT detection of a possible GRB
  5. GRB 050714B: VLT R-band observations
  6. GRB 050717: Additional LCO observations
  7. GRB 050716; J-band observations
  8. GRB 050717: LCO near-IR observations
  9. Swift/UVOT Observations of GRB 050717
  10. GRB 050717: Swift-BAT refined analysis
  11. GRB050717: Swift XRT position
  12. Swift detection of GRB 050717
  13. Swift UVOT Observations of GRB 050716
  14. GRB 050716: Refined XRT analysis.
  15. GRB050716: Refined analysis of the Swift-BAT burst
  16. GRB 050716: Lulin B and R band optical observations
  17. GRB050716, optical observation
  18. GRB050716: Faulkes North Telescope observation
  19. GRB050715: Refined analysis of the Swift-BAT burst
  20. GRB 050715: Swift-BAT detection
  21. GRB 050713b: RTT150 optical observations
  22. GRB050714B: Refined analysis of the Swift-BAT burst
  23. GRB 050714B: optical afterglow
  24. GRB 050714, R-band candidate
  25. GRB 050714, optical observations
  26. GRB 050713A: XRT refined analysis
  27. GRB 050713A: RAPTOR detection of early optical emission
  28. GRB050713B :Swift/UVOT observations
  29. GRB050713b: XRT refined analysis
  30. GRB050712: TNG R-band observations
  31. GRB 050713B: Swift-BAT Refined Analysis
  32. GRB 050713A: Swift/UVOT observation
  33. GRB 050713A : Swift-BAT Refined Analysis
  34. GRB050712: Swift UVOT Observation of Afterglow Emission
  35. GRB 050713A : Lulin R-band observation
  36. GRB 050713A XMM-Newton observation
  37. GRB 050713b : Lulin R-band observations
  38. GRB050713B: Faulkes North Telescope observation
  39. RBO RI observations of GRB 050713A
  40. GRB 050713B
  41. GRB050709 : Chandra source optical counterpart
  42. GRB050713: Liverpool Telescope prompt observations
  43. GRB 050712, optical observations
  44. GRB050709: Candidate X-ray Afterglow from Chandra
  45. GRB050713: possible I-band afterglow
  46. GRB050712: XRT refined analysis
  47. GRB050709: Radio Observations
  48. GRB 050709: Swift UVOT and XRT observations
  49. GRB 050712: Swift-BAT Refined Analysis
  50. GRB050712: UVOT candidate optical counterpart
  51. GRB 050709: LCO40 Observations
  52. GRB050709, optical observations
  53. PROMPT Rc Observations of GRB 050709
  54. GRB 050525a: PROMPT VRcIc Detections
  55. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  56. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  57. GRB 050626: Swift XRT observations
  58. GRB 050408: ARC 3.5-meter NIR Observations
  59. GRB 050701: Refined XRT analysis
  60. Swift UVOT observations of GRB 050701
  61. GRB050701: Swift-BAT Refined analysis
  62. Swift trigger 143708 is really GRB 050701
  63. GRB 050607, radio observations
  64. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  65. GRB050525a: HST Observations
  66. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  67. XRF 050509c: Optical monitoring
  68. Konus-Wind observation of an intermediate burst from SGR 1806-20
  69. XRF050509c: Radio Detection
  70. GRB 050607 optical decay
  71. GRB050607: refined analysis of prompt REM observations
  72. GRB 050607: PROMPT VRcIc Observations
  73. GRB 050607: Optical decay and spectral slope
  74. GRB050607,optical observation
  75. Optical Afterglow of GRB 050607
  76. GRB050607: Swift Detection of a long GRB
  77. GRB050607: prompt REM observations
  78. Limits on a SN in the field of GRB 050509b
  79. GRB 050603 - XRT data analysis of the first day
  80. GRB050603, submillimetre observations
  81. GRB050603: Radio Detection
  82. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  83. GRB 050603: INTEGRAL shows it is not a short GRB
  84. GRB 050525a, infrared observations
  85. GRB050528, XRT observations
  86. GRB050528: updated Liverpool Telescope limits
  87. Swift-BAT GRB 050528: a soft burst
  88. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  89. Possible GRB050528: no candidate from Liverpool Telescope
  90. GRB050525a: Radio Observations
  91. GRB 050509b: refined XRT/Chandra afterglow position analysis
  92. GRB 050525: RTT150, Optical observations
  93. GRB 050525a: SARA Observations
  94. GRB 050525B: Swift-BAT observations
  95. GRB 050525: MITSuME Optical Observation in VRI
  96. GRB050525A,optical observation
  97. GRB050525: Super-LOTIS observations
  98. GRB 050525, spectral lag pseudo-redshift
  99. GRB050306: optical afterglow not confirmed
  100. GRB 050525: BART optical observation

Advanced

Download all Circulars as a .tar.gz archive:
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov