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"

28076 results found.

  1. Swift UVOT Observations of GRB 050716
  2. GRB 050716: Refined XRT analysis.
  3. GRB050716: Refined analysis of the Swift-BAT burst
  4. GRB050716, optical observation
  5. GRB 050716: Optical Observations
  6. GRB050716: Faulkes North Telescope observation
  7. Swift/BAT detection of GRB 050716
  8. GRB050715: Refined analysis of the Swift-BAT burst
  9. GRB 050715: Swift-BAT detection
  10. Swift UVOT Observations of GRB 050714B
  11. Konus-Wind observation of GRB 050713A
  12. GRB 050714B: refined XRT analysis
  13. GRB050714B: Refined analysis of the Swift-BAT burst
  14. Swift detection of a long transient (GRB 050714B?)
  15. GRB 050714A: ROTSE-III Optical Limits
  16. GRB 050713A: XRT refined analysis
  17. GRB 050713A: RAPTOR detection of early optical emission
  18. GRB050713B :Swift/UVOT observations
  19. GRB050713b: XRT refined analysis
  20. GRB 050713B: Swift-BAT Refined Analysis
  21. Swift-BAT Trigger 145729 is not a GRB
  22. GRB 050713A: Swift/UVOT observation
  23. GRB 050713A : Swift-BAT Refined Analysis
  24. GRB050713B: Faulkes North Telescope observation
  25. RBO RI observations of GRB 050713A
  26. GRB 050713B
  27. GRB 050713: Swift detection of Bright Burst
  28. GRB 050713A: ROTSE-III Optical Limits
  29. GRB 050712: Swift-BAT Refined Analysis
  30. GRB050712: UVOT candidate optical counterpart
  31. GRB 050712: Swift XRT afterglow position
  32. GRB 050712: Swift detection of a weak burst
  33. GRB050709: A Possible Short-Hard GRB Localized by HETE
  34. GRB 050701
  35. GRB 050701, optical observations
  36. GRB 050701: Refined XRT analysis
  37. Swift UVOT observations of GRB 050701
  38. GRB050701: Swift-BAT Refined analysis
  39. Swift trigger 143708 is really GRB 050701
  40. GRB 050525A: Swift Late-Time Decay Rate
  41. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  42. XRF 050509c: Optical monitoring
  43. Konus-Wind observation of an intermediate burst from SGR 1806-20
  44. GRB 050607 optical decay
  45. Swift/UVOT observations of GRB050607
  46. GRB 050607: RAPTOR-S Early Optical Limits
  47. GRB 050607: MDM Observations
  48. GRB050607,optical observation
  49. GRB 050607 - XRT refined data analysis
  50. GRB050607 optical limit by "Pi of the Sky"
  51. GRB050607: Swift Detection of a long GRB
  52. GRB 050603: prediction of t_break
  53. Konus-Wind observation of GRB 050603
  54. GRB050603: Fading Afterglow observed by Swift UVOT
  55. GRB 050603: Swift XRT Position
  56. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  57. Swift/BAT Detection of GRB050603
  58. GRB 050408: jet break in the XRT light curve
  59. GRB050528, XRT observations
  60. Swift-BAT GRB 050528: a soft burst
  61. Update on Swift-BAT GRB 050528 (Trigger 130679)
  62. GRB050528: BOOTES optical candidate (retraction)
  63. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  64. GRB050528: BOOTES optical candidate
  65. Possible GRB050528: no candidate from Liverpool Telescope
  66. Swift-BAT detection of possible GRB 050528
  67. GRB 050525B: Swift-BAT observations
  68. GRB050525A,optical observation
  69. GRB050525: Super-LOTIS observations
  70. GRB 050525A: Swift-BAT refined analysis
  71. Swift/UVOT UV and optical detections of GRB 050525
  72. Konus-Wind observation of GRB 050525
  73. GRB 050525 - Very Bright, Not Short
  74. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  75. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  76. GRB 050509A: Further I-band imaging
  77. GRB050522,optical observation
  78. GRB050520,optical observation
  79. GRB 050520: VLT/ULTRACAM observations
  80. GRB 050520: BART optical limit
  81. No Swift-BAT Lightcurves in real-time for next 3 weeks
  82. Swift-BAT trigger 122203 is not a real GRB
  83. XRF 050509C: REM NIR and Optical refined analysis
  84. XRF 050509c optical afterglow
  85. GRB050509b, SDSS pre-burst observations
  86. GRB 050509b: RAPTOR deep, early limits.
  87. GRB 050509b: Swift/UVOT follow-up measurements
  88. GRB050509B: Optical observations at the Very Large Telescope
  89. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  90. GRB 050509a: Swift-BAT refined analysis
  91. GRB 050509c: ROTSE-III Optical Limits
  92. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  93. GRB050509c: REM NIR and Optical observations
  94. Swift UVOT Follow-up Observations of GRB 050509B
  95. GRB 050509B: Swift/XRT refined analysis
  96. GRB050509a: Swift UVOT observations
  97. GRB 050509b: Optical observations
  98. GRB 050509A: Optical observations
  99. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  100. GRB 050509B: ROTSE-III Optical Limits

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