Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

25907 results found.

  1. GRB 050712: Swift XRT afterglow position
  2. GRB 050712: Swift detection of a weak burst
  3. GRB050709: A Possible Short-Hard GRB Localized by HETE
  4. GRB 050525a: PROMPT VRcIc Detections
  5. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  6. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  7. GRB 050626 optical observations
  8. GRB 050626: Swift XRT observations
  9. GRB 050701
  10. GRB 050701, optical observations
  11. GRB 050408: ARC 3.5-meter NIR Observations
  12. GRB 050701: Refined XRT analysis
  13. Swift UVOT observations of GRB 050701
  14. GRB050701: Swift-BAT Refined analysis
  15. GRB 050701: Swift XRT afterglow position
  16. Swift trigger 143708 is really GRB 050701
  17. GRB 050607, radio observations
  18. GRB 050525A: Swift Late-Time Decay Rate
  19. GRB050525a: HST Observations
  20. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  21. XRF 050509c: Optical monitoring
  22. XRF050509c: Radio Detection
  23. GRB 050416(a): Host Galaxy Redshift Determination
  24. GRB 050607: MDM Observation
  25. GRB 050607 optical decay
  26. Swift/UVOT observations of GRB050607
  27. GRB 050607 : Lulin R-band observation
  28. GRB 050607: PROMPT VRcIc Observations
  29. GRB 050607: RAPTOR-S Early Optical Limits
  30. GRB050607: KAIT optical limits
  31. GRB 050525a, Mid-Infrared Observations
  32. GRB 050607: Optical decay and spectral slope
  33. GRB 050607: MDM Observations
  34. GRB050607,optical observation
  35. GRB 050607 - XRT refined data analysis
  36. Optical Afterglow of GRB 050607
  37. GRB050607 optical limit by "Pi of the Sky"
  38. GRB050607: Swift Detection of a long GRB
  39. Limits on a SN in the field of GRB 050509b
  40. GRB 050603: Redshift
  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. GRB050603, submillimetre observations
  46. GRB 050603: Swift XRT Position
  47. GRB050603: Radio Detection
  48. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  49. GRB 050603: Afterglow Identification from LCO
  50. Swift/BAT Detection of GRB050603
  51. GRB 050408: jet break in the XRT light curve
  52. GRB 050525a, infrared observations
  53. GRB 050525a, SMARTS optical/IR afterglow observations
  54. GRB050528, XRT observations
  55. Correction to GCN Circ 3502 on GRB 050528
  56. Swift-BAT GRB 050528: a soft burst
  57. Update on Swift-BAT GRB 050528 (Trigger 130679)
  58. Possible GRB050528: no candidate from Liverpool Telescope
  59. Swift-BAT detection of possible GRB 050528
  60. GRB 050509b: refined XRT/Chandra afterglow position analysis
  61. GRB050525a: optical upper limits
  62. GRB 050525a: SARA Observations
  63. GRB 050525B: Swift-BAT observations
  64. GRB 050525: MITSuME Optical Observation in VRI
  65. GRB 050525a: MDM Observations
  66. GRB050525A,optical observation
  67. GRB 050525 : Lulin optical afterglow observations
  68. GRB050525: Super-LOTIS observations
  69. GRB 050525, spectral lag pseudo-redshift
  70. GRB050306: optical afterglow not confirmed
  71. GRB 050525A: BOOTES simultaneous optical observations
  72. GRB 050525A: Swift-BAT refined analysis
  73. GRB050525: Optical observations
  74. Swift/UVOT UV and optical detections of GRB 050525
  75. Konus-Wind observation of GRB 050525
  76. GRB 050525: TAROT observations of the early afterglow
  77. INTEGRAL detection of GRB 050525
  78. GRB 050525, infrared observations
  79. GRB 050525: Optical observation
  80. GRB 050525: observatons of the optical afterglow
  81. GRB050525: ROTSE-III Refined Analysis
  82. GRB 050525 - Very Bright, Not Short
  83. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  84. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  85. XRF050522: NIR observations of XRT candidate
  86. XRF 050522: Swift XRT refined analysis
  87. Swift/UVOT observation of XRF 050522
  88. GRB 050509A: Further I-band imaging
  89. RBO Observations of GRB050522
  90. GRB050509b: optical observations
  91. GRB050520: Radio Observations
  92. XRF 050522: Swift XRT observation
  93. XRF050522, BVRcIc field photometry
  94. XRF050522: Optical Observations
  95. XRF050522: Near-infrared Observations
  96. GRB 050520: VLT/ULTRACAM observations
  97. Swift UVOT Observations of GRB 050520
  98. GRB 050520: Swift XRT refined analysis
  99. XRF050509C: Chandra Afterglow Detection
  100. XRF 050509c: Swift XRT Upper Limit

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