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"

26513 results found.

  1. GRB050713b: XRT refined analysis
  2. GRB050712: TNG R-band observations
  3. GRB 050713B: Swift-BAT Refined Analysis
  4. GRB 050713A: Swift/UVOT observation
  5. GRB 050713A : Swift-BAT Refined Analysis
  6. GRB050712: Swift UVOT Observation of Afterglow Emission
  7. GRB 050713A : Lulin R-band observation
  8. GRB 050713A XMM-Newton observation
  9. GRB 050713b : Lulin R-band observations
  10. GRB050713B: Faulkes North Telescope observation
  11. RBO RI observations of GRB 050713A
  12. GRB 050713B
  13. GRB050709 : Chandra source optical counterpart
  14. GRB050713: Liverpool Telescope prompt observations
  15. GRB 050712, optical observations
  16. GRB050709: Candidate X-ray Afterglow from Chandra
  17. GRB050713: possible I-band afterglow
  18. GRB050712: XRT refined analysis
  19. GRB050709: Radio Observations
  20. GRB 050709: Swift UVOT and XRT observations
  21. GRB 050712: Swift-BAT Refined Analysis
  22. GRB050712: UVOT candidate optical counterpart
  23. GRB 050709: LCO40 Observations
  24. GRB050709, optical observations
  25. PROMPT Rc Observations of GRB 050709
  26. GRB 050525a: PROMPT VRcIc Detections
  27. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  28. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  29. GRB 050626: Swift XRT observations
  30. GRB 050408: ARC 3.5-meter NIR Observations
  31. GRB 050701: Refined XRT analysis
  32. Swift UVOT observations of GRB 050701
  33. GRB050701: Swift-BAT Refined analysis
  34. Swift trigger 143708 is really GRB 050701
  35. GRB 050607, radio observations
  36. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  37. GRB050525a: HST Observations
  38. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  39. XRF 050509c: Optical monitoring
  40. Konus-Wind observation of an intermediate burst from SGR 1806-20
  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. GRB 050603 - XRT data analysis of the first day
  52. GRB050603, submillimetre observations
  53. GRB050603: Radio Detection
  54. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  55. GRB 050603: INTEGRAL shows it is not a short GRB
  56. GRB 050525a, infrared observations
  57. GRB050528, XRT 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. GRB050525a: Radio Observations
  63. GRB 050509b: refined XRT/Chandra afterglow position analysis
  64. GRB 050525: RTT150, Optical observations
  65. GRB 050525a: SARA Observations
  66. GRB 050525B: Swift-BAT observations
  67. GRB 050525: MITSuME Optical Observation in VRI
  68. GRB050525A,optical observation
  69. GRB050525: Super-LOTIS observations
  70. GRB 050525, spectral lag pseudo-redshift
  71. GRB050306: optical afterglow not confirmed
  72. GRB 050525: BART optical observation
  73. GRB 050525A: BOOTES simultaneous optical observations
  74. GRB 050525A: Swift-BAT refined analysis
  75. GRB050525: Optical observations
  76. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  77. Konus-Wind observation of GRB 050525
  78. GRB 050525: TAROT observations of the early afterglow
  79. INTEGRAL detection of GRB 050525
  80. GRB 050525, infrared observations
  81. GRB 050525: observatons of the optical afterglow
  82. GRB050525: ROTSE-III Refined Analysis
  83. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  84. XRF050522: Radio Observations
  85. Swift/UVOT observation of XRF 050522
  86. GRB 050509A: Further I-band imaging
  87. GRB050522,optical observation
  88. GRB050520,optical observation
  89. XRF 050522: Continued NIR P200 Monitoring
  90. RBO Observations of GRB050522
  91. Recent GRB BVRcIc field photometry
  92. GRB050520: Radio Observations
  93. XRF 050522: Swift XRT observation
  94. XRF050522, BVRcIc field photometry
  95. XRF050522: Optical Observations
  96. XRF050522: Near-infrared Observations
  97. GRB 050520: VLT/ULTRACAM observations
  98. GRB 050520: Swift XRT refined analysis
  99. XRF050509C: Chandra Afterglow Detection
  100. XRF050509c: Radio Observations

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