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"

19538 results found.

  1. GRB 050721a: Optical Observations
  2. GRB050721A: Swift-BAT detection of a weak burst
  3. GRB 050714a: Refined XRT analysis and afterglow confirmation
  4. Swift-BAT trigger 146731 is not a real GRB
  5. Swift-BAT detection of a possible GRB
  6. GRB050717
  7. Konus-Wind observation of GRB 050717
  8. Swift/UVOT Observations of GRB 050717
  9. GRB 050717: Swift-BAT refined analysis
  10. GRB 050717: Refined XRT analysis.
  11. GRB050712: optical limits
  12. GRB050717: Swift XRT position
  13. Swift detection of GRB 050717
  14. GRB 050716 - UKIRT identification of candidate afterglow
  15. Swift UVOT Observations of GRB 050716
  16. GRB 050716: Refined XRT analysis.
  17. GRB050716: Refined analysis of the Swift-BAT burst
  18. GRB050716, optical observation
  19. GRB050716: Faulkes North Telescope observation
  20. GRB050716: Correction to sign in XRT coordinate
  21. Swift/BAT detection of GRB 050716
  22. GRB050715: Refined analysis of the Swift-BAT burst
  23. GRB 050715: Swift-BAT detection
  24. Swift UVOT Observations of GRB 050714B
  25. Konus-Wind observation of GRB 050713A
  26. GRB 050714B: refined XRT analysis
  27. GRB050714B: Refined analysis of the Swift-BAT burst
  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. GRB 050713B: Swift-BAT Refined Analysis
  35. Swift-BAT Trigger 145729 is not a GRB
  36. GRB 050713A: Swift/UVOT observation
  37. GRB 050713A : Swift-BAT Refined Analysis
  38. GRB050712: Swift UVOT Observation of Afterglow Emission
  39. GRB 050713A XMM-Newton observation
  40. GRB050713B: Faulkes North Telescope observation
  41. RBO RI observations of GRB 050713A
  42. GRB 050713B
  43. GRB050713: Liverpool Telescope prompt observations
  44. GRB050709: Candidate X-ray Afterglow from Chandra
  45. GRB 050713, R-band observations at NOT
  46. GRB 050713: Swift detection of Bright Burst
  47. GRB 050713A: ROTSE-III Optical Limits
  48. GRB050712: XRT refined analysis
  49. GRB 050709: Swift UVOT and XRT observations
  50. GRB 050712: Swift-BAT Refined Analysis
  51. GRB050712: UVOT candidate optical counterpart
  52. GRB 050712: Swift XRT afterglow position
  53. GRB 050712: Swift detection of a weak burst
  54. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  55. GRB 050626: Swift XRT observations
  56. GRB 050701
  57. GRB 050701, optical observations
  58. GRB 050701: Refined XRT analysis
  59. Swift UVOT observations of GRB 050701
  60. GRB050701: Swift-BAT Refined analysis
  61. GRB 050701: Swift XRT afterglow position
  62. Swift trigger 143708 is really GRB 050701
  63. GRB 050525A: Swift Late-Time Decay Rate
  64. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  65. GRB 050416(a): Host Galaxy Redshift Determination
  66. Swift/UVOT observations of GRB050607
  67. GRB 050607: RAPTOR-S Early Optical Limits
  68. GRB050607: KAIT optical limits
  69. GRB 050607: MDM Observations
  70. GRB050607,optical observation
  71. GRB 050607 - XRT refined data analysis
  72. GRB050607 optical limit by "Pi of the Sky"
  73. GRB050607: Swift Detection of a long GRB
  74. GRB 050603 - XRT data analysis of the first day
  75. Konus-Wind observation of GRB 050603
  76. GRB 050603: Analysis of UVOT data
  77. GRB050603: Fading Afterglow observed by Swift UVOT
  78. GRB 050603: Swift XRT Position
  79. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  80. Swift/BAT Detection of GRB050603
  81. GRB 050408: jet break in the XRT light curve
  82. GRB050528, XRT observations
  83. Correction to GCN Circ 3502 on GRB 050528
  84. Swift-BAT GRB 050528: a soft burst
  85. Update on Swift-BAT GRB 050528 (Trigger 130679)
  86. Possible GRB050528: no candidate from Liverpool Telescope
  87. Swift-BAT detection of possible GRB 050528
  88. GRB 050509b: refined XRT/Chandra afterglow position analysis
  89. GRB050525a: optical upper limits
  90. GRB 050525B: Swift-BAT observations
  91. GRB050525A,optical observation
  92. GRB050525: Super-LOTIS observations
  93. GRB 050525, spectral lag pseudo-redshift
  94. GRB050306: optical afterglow not confirmed
  95. GRB 050525A: BOOTES simultaneous optical observations
  96. GRB 050525A: Swift-BAT refined analysis
  97. Swift/UVOT UV and optical detections of GRB 050525
  98. Konus-Wind observation of GRB 050525
  99. GRB 050525: TAROT observations of the early afterglow
  100. INTEGRAL detection of GRB 050525

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