Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

19664 results found.

  1. GRB 050730: Swift XRT afterglow observations
  2. GRB 050730 XMM-Newton observation
  3. GRB050730, afterglow observations
  4. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  5. GRB050730: Liverpool Telescope optical observations
  6. GRB 050730, optical candidate
  7. GRB050730: Swift-BAT detection of a weak burst
  8. GRB 050713A: Swift XRT extended light curve
  9. GRB050726: Swift UVOT observations
  10. GRB 050724: Chandra Observations of the X-ray Afterglow
  11. GRB050713: analysis of the XMM-Newton observation
  12. Swift-BAT trigger 147918 is not a real GRB
  13. GRB 050727: RTT150 optical observations
  14. GRB050727: KAIT optical limit
  15. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  16. GRB 050726: early Swift XRT analysis results
  17. GRB050726: Swift-BAT detection of a weak burst
  18. GRB 050724: SWIFT XRT refined position
  19. GRB 050724: optical and near-IR observations
  20. GRB 050724: Swift/UVOT Upper Limit
  21. GRB 050724: early Swift XRT analysis results
  22. GRB050724: Refined analysis of the Swift-BAT possible short burst
  23. GRB050724: a short-burst detected by Swift
  24. Swift-BAT trigger 147325 is not due to a real GRB
  25. GRB050723: XRT distributed coordinates are not related to the burst
  26. GRB 050721A: Swift-BAT refined analysis
  27. GRB 050721A: Early Swift XRT analysis results
  28. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  29. GRB 050721a: Optical Observations
  30. GRB050721A: Swift-BAT detection of a weak burst
  31. GRB 050714a: Refined XRT analysis and afterglow confirmation
  32. Swift-BAT trigger 146731 is not a real GRB
  33. Swift-BAT detection of a possible GRB
  34. GRB050717
  35. Konus-Wind observation of GRB 050717
  36. Swift/UVOT Observations of GRB 050717
  37. GRB 050717: Swift-BAT refined analysis
  38. GRB 050717: Refined XRT analysis.
  39. GRB050712: optical limits
  40. GRB050717: Swift XRT position
  41. Swift detection of GRB 050717
  42. GRB 050716 - UKIRT identification of candidate afterglow
  43. Swift UVOT Observations of GRB 050716
  44. GRB 050716: Refined XRT analysis.
  45. GRB050716: Refined analysis of the Swift-BAT burst
  46. GRB050716, optical observation
  47. GRB050716: Faulkes North Telescope observation
  48. GRB050716: Correction to sign in XRT coordinate
  49. Swift/BAT detection of GRB 050716
  50. GRB050715: Refined analysis of the Swift-BAT burst
  51. GRB 050715: Swift-BAT detection
  52. Swift UVOT Observations of GRB 050714B
  53. Konus-Wind observation of GRB 050713A
  54. GRB 050714B: refined XRT analysis
  55. GRB050714B: Refined analysis of the Swift-BAT burst
  56. Swift detection of a long transient (GRB 050714B?)
  57. GRB 050714: Swift XRT afterglow position
  58. GRB 050713A: XRT refined analysis
  59. GRB 050713A: RAPTOR detection of early optical emission
  60. GRB050713B :Swift/UVOT observations
  61. GRB050713b: XRT refined analysis
  62. GRB 050713B: Swift-BAT Refined Analysis
  63. Swift-BAT Trigger 145729 is not a GRB
  64. GRB 050713A: Swift/UVOT observation
  65. GRB 050713A : Swift-BAT Refined Analysis
  66. GRB050712: Swift UVOT Observation of Afterglow Emission
  67. GRB 050713A XMM-Newton observation
  68. GRB050713B: Faulkes North Telescope observation
  69. RBO RI observations of GRB 050713A
  70. GRB 050713B
  71. GRB050713: Liverpool Telescope prompt observations
  72. GRB050709: Candidate X-ray Afterglow from Chandra
  73. GRB 050713, R-band observations at NOT
  74. GRB 050713: Swift detection of Bright Burst
  75. GRB 050713A: ROTSE-III Optical Limits
  76. GRB050712: XRT refined analysis
  77. GRB 050709: Swift UVOT and XRT observations
  78. GRB 050712: Swift-BAT Refined Analysis
  79. GRB050712: UVOT candidate optical counterpart
  80. GRB 050712: Swift XRT afterglow position
  81. GRB 050712: Swift detection of a weak burst
  82. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  83. GRB 050626: Swift XRT observations
  84. GRB 050701
  85. GRB 050701, optical observations
  86. GRB 050701: Refined XRT analysis
  87. Swift UVOT observations of GRB 050701
  88. GRB050701: Swift-BAT Refined analysis
  89. GRB 050701: Swift XRT afterglow position
  90. Swift trigger 143708 is really GRB 050701
  91. GRB 050525A: Swift Late-Time Decay Rate
  92. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  93. GRB 050416(a): Host Galaxy Redshift Determination
  94. Swift/UVOT observations of GRB050607
  95. GRB 050607: RAPTOR-S Early Optical Limits
  96. GRB050607: KAIT optical limits
  97. GRB 050607: MDM Observations
  98. GRB050607,optical observation
  99. GRB 050607 - XRT refined data analysis
  100. GRB050607 optical limit by "Pi of the Sky"

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