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"

21393 results found.

  1. GRB 050714B: VLT R-band observations
  2. GRB 050717: Additional LCO observations
  3. GRB050717
  4. Konus-Wind observation of GRB 050717
  5. GRB 050717: LCO near-IR observations
  6. Swift/UVOT Observations of GRB 050717
  7. GRB 050717: Swift-BAT refined analysis
  8. GRB 050717: Refined XRT analysis.
  9. GRB050712: optical limits
  10. GRB050717: Swift XRT position
  11. Swift detection of GRB 050717
  12. GRB 050716 - UKIRT identification of candidate afterglow
  13. Swift UVOT Observations of GRB 050716
  14. GRB 050716: Refined XRT analysis.
  15. GRB050716: Refined analysis of the Swift-BAT burst
  16. GRB050716, optical observation
  17. GRB050716: Faulkes North Telescope observation
  18. GRB050716: Correction to sign in XRT coordinate
  19. Swift/BAT detection of GRB 050716
  20. GRB050715: Refined analysis of the Swift-BAT burst
  21. GRB 050715: Swift-BAT detection
  22. Swift UVOT Observations of GRB 050714B
  23. Konus-Wind observation of GRB 050713A
  24. GRB 050714B: refined XRT analysis
  25. GRB 050714B: candidate afterglow does not fade
  26. GRB050714B: Refined analysis of the Swift-BAT burst
  27. GRB 050714B: optical afterglow
  28. Swift detection of a long transient (GRB 050714B?)
  29. GRB 050714: Swift XRT afterglow position
  30. GRB 050713A: XRT refined analysis
  31. GRB 050713A: RAPTOR detection of early optical emission
  32. GRB050713B :Swift/UVOT observations
  33. GRB050713b: XRT refined analysis
  34. GRB050712: TNG R-band observations
  35. GRB 050713B: Swift-BAT Refined Analysis
  36. Swift-BAT Trigger 145729 is not a GRB
  37. GRB 050713A: Swift/UVOT observation
  38. GRB 050713A : Swift-BAT Refined Analysis
  39. GRB050712: Swift UVOT Observation of Afterglow Emission
  40. GRB 050713A XMM-Newton observation
  41. GRB050713B: Faulkes North Telescope observation
  42. RBO RI observations of GRB 050713A
  43. GRB 050713B
  44. GRB050713: Liverpool Telescope prompt observations
  45. GRB050709: Candidate X-ray Afterglow from Chandra
  46. GRB 050713, R-band observations at NOT
  47. GRB050713: possible I-band afterglow
  48. GRB 050713: Swift detection of Bright Burst
  49. GRB 050713A: ROTSE-III Optical Limits
  50. GRB050712: XRT refined analysis
  51. GRB 050709: Swift UVOT and XRT observations
  52. GRB 050712: Swift-BAT Refined Analysis
  53. GRB050712: UVOT candidate optical counterpart
  54. GRB 050712: Swift XRT afterglow position
  55. GRB 050712: Swift detection of a weak burst
  56. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  57. GRB 050626: Swift XRT observations
  58. GRB 050701
  59. GRB 050701, optical observations
  60. GRB 050701: Refined XRT analysis
  61. Swift UVOT observations of GRB 050701
  62. GRB050701: Swift-BAT Refined analysis
  63. GRB 050701: Swift XRT afterglow position
  64. Swift trigger 143708 is really GRB 050701
  65. GRB 050525A: Swift Late-Time Decay Rate
  66. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  67. GRB 050416(a): Host Galaxy Redshift Determination
  68. Swift/UVOT observations of GRB050607
  69. GRB 050607: PROMPT VRcIc Observations
  70. GRB 050607: RAPTOR-S Early Optical Limits
  71. GRB050607: KAIT optical limits
  72. GRB 050607: MDM Observations
  73. GRB050607,optical observation
  74. GRB 050607 - XRT refined data analysis
  75. Optical Afterglow of GRB 050607
  76. GRB050607 optical limit by "Pi of the Sky"
  77. GRB050607: Swift Detection of a long GRB
  78. Limits on a SN in the field of GRB 050509b
  79. GRB 050603: Redshift
  80. GRB 050603 - XRT data analysis of the first day
  81. Konus-Wind observation of GRB 050603
  82. GRB 050603: Analysis of UVOT data
  83. GRB050603: Fading Afterglow observed by Swift UVOT
  84. GRB 050603: Swift XRT Position
  85. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  86. Swift/BAT Detection of GRB050603
  87. GRB 050408: jet break in the XRT light curve
  88. GRB050528, XRT observations
  89. Correction to GCN Circ 3502 on GRB 050528
  90. Swift-BAT GRB 050528: a soft burst
  91. Update on Swift-BAT GRB 050528 (Trigger 130679)
  92. Possible GRB050528: no candidate from Liverpool Telescope
  93. Swift-BAT detection of possible GRB 050528
  94. GRB 050509b: refined XRT/Chandra afterglow position analysis
  95. GRB050525a: optical upper limits
  96. GRB 050525B: Swift-BAT observations
  97. GRB050525A,optical observation
  98. GRB050525: Super-LOTIS observations
  99. GRB 050525, spectral lag pseudo-redshift
  100. GRB050306: optical afterglow not confirmed

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