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"

19203 results found.

  1. GRB 050713B: Swift-BAT Refined Analysis
  2. Swift-BAT Trigger 145729 is not a GRB
  3. GRB 050713A: Swift/UVOT observation
  4. GRB 050713A : Swift-BAT Refined Analysis
  5. GRB050712: Swift UVOT Observation of Afterglow Emission
  6. GRB 050713A XMM-Newton observation
  7. GRB050713B: Faulkes North Telescope observation
  8. RBO RI observations of GRB 050713A
  9. GRB 050713B
  10. GRB050713: Liverpool Telescope prompt observations
  11. GRB050709: Candidate X-ray Afterglow from Chandra
  12. GRB 050713, R-band observations at NOT
  13. GRB 050713: Swift detection of Bright Burst
  14. GRB 050713A: ROTSE-III Optical Limits
  15. GRB050712: XRT refined analysis
  16. GRB 050709: Swift UVOT and XRT observations
  17. GRB 050712: Swift-BAT Refined Analysis
  18. GRB050712: UVOT candidate optical counterpart
  19. GRB 050712: Swift XRT afterglow position
  20. GRB 050712: Swift detection of a weak burst
  21. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  22. GRB 050626: Swift XRT observations
  23. GRB 050701
  24. GRB 050701, optical observations
  25. GRB 050701: Refined XRT analysis
  26. Swift UVOT observations of GRB 050701
  27. GRB050701: Swift-BAT Refined analysis
  28. GRB 050701: Swift XRT afterglow position
  29. Swift trigger 143708 is really GRB 050701
  30. GRB 050525A: Swift Late-Time Decay Rate
  31. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  32. GRB 050416(a): Host Galaxy Redshift Determination
  33. Swift/UVOT observations of GRB050607
  34. GRB 050607: RAPTOR-S Early Optical Limits
  35. GRB050607: KAIT optical limits
  36. GRB 050607: MDM Observations
  37. GRB050607,optical observation
  38. GRB 050607 - XRT refined data analysis
  39. GRB050607 optical limit by "Pi of the Sky"
  40. GRB050607: Swift Detection of a long GRB
  41. GRB 050603 - XRT data analysis of the first day
  42. Konus-Wind observation of GRB 050603
  43. GRB 050603: Analysis of UVOT data
  44. GRB050603: Fading Afterglow observed by Swift UVOT
  45. GRB 050603: Swift XRT Position
  46. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  47. Swift/BAT Detection of GRB050603
  48. GRB 050408: jet break in the XRT light curve
  49. GRB050528, XRT observations
  50. Correction to GCN Circ 3502 on GRB 050528
  51. Swift-BAT GRB 050528: a soft burst
  52. Update on Swift-BAT GRB 050528 (Trigger 130679)
  53. Possible GRB050528: no candidate from Liverpool Telescope
  54. Swift-BAT detection of possible GRB 050528
  55. GRB 050509b: refined XRT/Chandra afterglow position analysis
  56. GRB050525a: optical upper limits
  57. GRB 050525B: Swift-BAT observations
  58. GRB050525A,optical observation
  59. GRB050525: Super-LOTIS observations
  60. GRB 050525, spectral lag pseudo-redshift
  61. GRB050306: optical afterglow not confirmed
  62. GRB 050525A: BOOTES simultaneous optical observations
  63. GRB 050525A: Swift-BAT refined analysis
  64. Swift/UVOT UV and optical detections of GRB 050525
  65. Konus-Wind observation of GRB 050525
  66. GRB 050525: TAROT observations of the early afterglow
  67. INTEGRAL detection of GRB 050525
  68. GRB 050525: Optical observation
  69. GRB050525: ROTSE-III Refined Analysis
  70. GRB 050525 - Very Bright, Not Short
  71. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  72. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  73. XRF 050522: Swift XRT refined analysis
  74. Swift/UVOT observation of XRF 050522
  75. GRB 050509A: Further I-band imaging
  76. RBO Observations of GRB050522
  77. XRF 050522: Swift XRT observation
  78. GRB 050520: VLT/ULTRACAM observations
  79. Swift UVOT Observations of GRB 050520
  80. GRB 050520: Swift XRT refined analysis
  81. XRF050509C: Chandra Afterglow Detection
  82. XRF 050509c: Swift XRT Upper Limit
  83. RBO Observations of GRB050520
  84. GRB 050520: TAROT optical limit
  85. GRB 050520: Swift XRT position
  86. No Swift-BAT Lightcurves in real-time for next 3 weeks
  87. Swift-BAT trigger 122203 is not a real GRB
  88. GRB 050504: Swift XRT afterglow candidate has faded
  89. GRB 050509B: Subaru Optical Observations
  90. GRB050502b: Early Observation
  91. Refined Chandra analysis of GRB 050509b
  92. GRB050509b, SDSS pre-burst observations
  93. Chandra observation of GRB 050509b
  94. GRB 050509b: RAPTOR deep, early limits.
  95. GRB050509B: Optical/Infared observations
  96. GRB 050509b: Swift/UVOT follow-up measurements
  97. GRB 050509b Milagro GeV/TeV Observations
  98. GRB050509B: Optical observations at the Very Large Telescope
  99. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  100. GRB 050509a: Swift-BAT refined analysis

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