Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! 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"

27408 results found.

  1. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  2. GRB 050726: early Swift XRT analysis results
  3. GRB050726: Swift-BAT detection of a weak burst
  4. GRB 050724: SWIFT XRT refined position
  5. GRB 050724: Optical limit
  6. GRB 050724: optical and near-IR observations
  7. GRB 050724: Swift/UVOT Upper Limit
  8. GRB 050724: early Swift XRT analysis results
  9. GRB050724: Refined analysis of the Swift-BAT possible short burst
  10. GRB050724: a short-burst detected by Swift
  11. Swift-BAT trigger 147325 is not due to a real GRB
  12. GRB050723: XRT distributed coordinates are not related to the burst
  13. GRB 050721A: Swift-BAT refined analysis
  14. GRB 050721A: Early Swift XRT analysis results
  15. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  16. GRB 050721a: Optical Observations
  17. GRB050721A: Swift-BAT detection of a weak burst
  18. Swift-BAT trigger 146731 is not a real GRB
  19. Swift-BAT detection of a possible GRB
  20. GRB050717
  21. Konus-Wind observation of GRB 050717
  22. Swift/UVOT Observations of GRB 050717
  23. GRB 050717: Swift-BAT refined analysis
  24. GRB 050717: Refined XRT analysis.
  25. GRB050717: Swift XRT position
  26. Swift detection of GRB 050717
  27. Swift UVOT Observations of GRB 050716
  28. GRB 050716: Refined XRT analysis.
  29. GRB050716: Refined analysis of the Swift-BAT burst
  30. GRB050716, optical observation
  31. GRB 050716: Optical Observations
  32. GRB050716: Faulkes North Telescope observation
  33. Swift/BAT detection of GRB 050716
  34. GRB050715: Refined analysis of the Swift-BAT burst
  35. GRB 050715: Swift-BAT detection
  36. Swift UVOT Observations of GRB 050714B
  37. Konus-Wind observation of GRB 050713A
  38. GRB 050714B: refined XRT analysis
  39. GRB050714B: Refined analysis of the Swift-BAT burst
  40. Swift detection of a long transient (GRB 050714B?)
  41. GRB 050714A: ROTSE-III Optical Limits
  42. GRB 050713A: XRT refined analysis
  43. GRB 050713A: RAPTOR detection of early optical emission
  44. GRB050713B :Swift/UVOT observations
  45. GRB050713b: XRT refined analysis
  46. GRB 050713B: Swift-BAT Refined Analysis
  47. Swift-BAT Trigger 145729 is not a GRB
  48. GRB 050713A: Swift/UVOT observation
  49. GRB 050713A : Swift-BAT Refined Analysis
  50. GRB050713B: Faulkes North Telescope observation
  51. RBO RI observations of GRB 050713A
  52. GRB 050713B
  53. GRB 050713: Swift detection of Bright Burst
  54. GRB 050713A: ROTSE-III Optical Limits
  55. GRB050712: XRT refined analysis
  56. GRB 050712: Swift-BAT Refined Analysis
  57. GRB050712: UVOT candidate optical counterpart
  58. GRB 050712: Swift XRT afterglow position
  59. GRB 050712: Swift detection of a weak burst
  60. GRB050709: A Possible Short-Hard GRB Localized by HETE
  61. GRB 050525a: PROMPT VRcIc Detections
  62. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  63. GRB 050701
  64. GRB 050701, optical observations
  65. GRB 050701: Refined XRT analysis
  66. Swift UVOT observations of GRB 050701
  67. GRB050701: Swift-BAT Refined analysis
  68. GRB 050701: Swift XRT afterglow position
  69. Swift trigger 143708 is really GRB 050701
  70. GRB 050525A: Swift Late-Time Decay Rate
  71. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  72. XRF 050509c: Optical monitoring
  73. Konus-Wind observation of an intermediate burst from SGR 1806-20
  74. GRB 050607 optical decay
  75. Swift/UVOT observations of GRB050607
  76. GRB 050607: PROMPT VRcIc Observations
  77. GRB 050607: RAPTOR-S Early Optical Limits
  78. GRB 050607: MDM Observations
  79. GRB050607,optical observation
  80. GRB 050607 - XRT refined data analysis
  81. GRB050607 optical limit by "Pi of the Sky"
  82. GRB050607: Swift Detection of a long GRB
  83. GRB050607: P60 Observations
  84. GRB 050603: prediction of t_break
  85. Konus-Wind observation of GRB 050603
  86. GRB050603: Fading Afterglow observed by Swift UVOT
  87. GRB 050603: Swift XRT Position
  88. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  89. GRB 050603: Afterglow Identification from LCO
  90. Swift/BAT Detection of GRB050603
  91. GRB 050408: jet break in the XRT light curve
  92. GRB050528, XRT observations
  93. Correction to GCN Circ 3502 on GRB 050528
  94. Swift-BAT GRB 050528: a soft burst
  95. Update on Swift-BAT GRB 050528 (Trigger 130679)
  96. GRB050528: BOOTES optical candidate (retraction)
  97. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  98. GRB050528: BOOTES optical candidate
  99. Possible GRB050528: no candidate from Liverpool Telescope
  100. Swift-BAT detection of possible GRB 050528

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
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