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"

45737 results found.

  1. GRB050727: KAIT optical limit
  2. GRB050709: Second Epoch Chandra Observation
  3. GRB 050726: PROMPT Rc Observations
  4. GRB050709: Second Epoch Chandra Observation
  5. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  6. GRB050724: Further Radio Observations
  7. GRB 050726: early Swift XRT analysis results
  8. GRB050726: Swift-BAT detection of a weak burst
  9. GRB 050724: Optical Variability in Nearby Galaxy
  10. GRB 050724: J-band observations
  11. GRB 050724: GMOS Imaging and Spectroscopy
  12. GRB 050724: SWIFT XRT refined position
  13. RXTE ASM Detection of GRB050724
  14. GRB050724: Radio Observation
  15. GRB 050724: spectroscopy of object in the XRT error circle
  16. GRB 050724: Optical limit
  17. GRB 050724: optical and near-IR observations
  18. GRB 050724: Optical imaging/astrometry
  19. GRB 050724: RTT150 optical observations
  20. GRB 050724: Swift/UVOT Upper Limit
  21. GRB 050724: early Swift XRT analysis results
  22. GRB 050724 : Lulin early R-band monitoring observations
  23. GRB050724: Refined analysis of the Swift-BAT possible short burst
  24. GRB 050724: possible host galaxy in DSS
  25. GRB050724: a short-burst detected by Swift
  26. Swift-BAT trigger 147325 is not due to a real GRB
  27. GRB050723: XRT distributed coordinates are not related to the burst
  28. GRB 050721: early afterglow light curve
  29. GRB 050721A: Swift-BAT refined analysis
  30. Correction to GCN Circ 3474 on GRB050525A
  31. GRB 050721A: Early Swift XRT analysis results
  32. GRB050721A: optical decay
  33. GRB 050721: optical afterglow confirmed
  34. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  35. GRB 050721a: Optical Observations
  36. GRB050721A: Swift-BAT detection of a weak burst
  37. GRB 050709: Refined Spectral and Temporal Properties
  38. GRB 050717: PROMPT RcIc Observations
  39. GRB050714b: Radio Observation
  40. GRB050712: Radio Observations
  41. GRB 050714a: Refined XRT analysis and afterglow confirmation
  42. GRB050713a: Radio Observation
  43. Swift-BAT trigger 146731 is not a real GRB
  44. GRB 050712, Tautenburg optical afterglow observations
  45. Swift-BAT detection of a possible GRB
  46. GRB 050714B: VLT R-band observations
  47. GRB 050717: Additional LCO observations
  48. GRB050717
  49. GRB 050716; J-band observations
  50. Konus-Wind observation of GRB 050717
  51. GRB 050717: LCO near-IR observations
  52. Swift/UVOT Observations of GRB 050717
  53. GRB 050717: Swift-BAT refined analysis
  54. GRB 050717: Refined XRT analysis.
  55. GRB050712: optical limits
  56. GRB050717: Swift XRT position
  57. Swift detection of GRB 050717
  58. GRB 050716 - UKIRT identification of candidate afterglow
  59. Swift UVOT Observations of GRB 050716
  60. GRB 050716: Refined XRT analysis.
  61. GRB050716: Refined analysis of the Swift-BAT burst
  62. GRB 050716: Lulin B and R band optical observations
  63. GRB050716, optical observation
  64. GRB 050716: Optical Observations
  65. GRB050716: Faulkes North Telescope observation
  66. GRB050716: Correction to sign in XRT coordinate
  67. Swift/BAT detection of GRB 050716
  68. GRB050715: Refined analysis of the Swift-BAT burst
  69. GRB 050715: Swift-BAT detection
  70. Swift UVOT Observations of GRB 050714B
  71. Konus-Wind observation of GRB 050713A
  72. GRB 050714B: refined XRT analysis
  73. GRB 050713b: RTT150 optical observations
  74. GRB 050714B: candidate afterglow does not fade
  75. GRB050714B: Refined analysis of the Swift-BAT burst
  76. GRB 050714B: optical afterglow
  77. Swift detection of a long transient (GRB 050714B?)
  78. GRB 050709: optical afterglow candidate
  79. GRB 050714, R-band candidate
  80. GRB 050714: Swift XRT afterglow position
  81. GRB 050714, optical observations
  82. GRB 050714A: ROTSE-III Optical Limits
  83. GRB 050714 - A long GRB detected with INTEGRAL
  84. GRB 050713A: XRT refined analysis
  85. GRB 050709: Spectroscopy
  86. GRB 050713A: RAPTOR detection of early optical emission
  87. GRB050713B :Swift/UVOT observations
  88. GRB050713b: XRT refined analysis
  89. GRB050712: TNG R-band observations
  90. GRB 050713B: Swift-BAT Refined Analysis
  91. Swift-BAT Trigger 145729 is not a GRB
  92. GRB 050713A: Swift/UVOT observation
  93. GRB 050713A : Swift-BAT Refined Analysis
  94. GRB050712: Swift UVOT Observation of Afterglow Emission
  95. GRB 050713A : Lulin R-band observation
  96. GRB 050713A XMM-Newton observation
  97. GRB 050713b : Lulin R-band observations
  98. GRB050713B: Faulkes North Telescope observation
  99. RBO RI observations of GRB 050713A
  100. GRB 050713B

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