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"

28095 results found.

  1. GRB050805b: MASTER optical observations
  2. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  3. GRB050805a: MASTER optical candidat
  4. GRB050802: TNG optical observations
  5. GRB050803: Radio Observation
  6. GRB 050803: RTT150 optical observations
  7. GRB050801: Radio Observation
  8. GRB050730: Radio Detection
  9. GRB 050803: Keck Observations
  10. GRB 050803: Swift-BAT refined analysis
  11. GRB 050802.422: Fading of the afterglow and detection of the host
  12. GRB 050803: early Swift XRT analysis results
  13. GRB 050803: TAROT optical limits
  14. GCN GRB observation 050713A
  15. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  16. GRB050802 radio non-detection
  17. GRB 050730: OHP optical observations
  18. GRB 050802: early Swift XRT analysis results
  19. GRB 050802: Swift/UVOT observations
  20. GRB 050802: Swift-BAT refined analysis
  21. GRB050801: Optical photometry and decay index
  22. GRB 050802: Swift Gamma-ray Burst
  23. GRB050801: Swift/UVOT Optical and UV detections
  24. GRB 050730: Preliminary Analysis of MIKE Spectrum
  25. GCN 050801: early Swift XRT analysis results
  26. GRB 050801: Swift-BAT refined analysis
  27. GRB 050730: XRT refined analysis
  28. GRB 050730: early TAROT optical observations
  29. GRB 050730, spectra and optical photometry
  30. GRB050730: Refined BAT analysis of the Swift-BAT burst
  31. GRB 050730 XMM-Newton observation
  32. GRB050730: Swift-BAT detection of a weak burst
  33. GRB050713b: Maidanak optical observations
  34. GRB 050724: Secure Host Redshift from Keck
  35. GRB 050724: WHT optical observations
  36. GRB050713: analysis of the XMM-Newton observation
  37. Swift-BAT trigger 147918 is not a real GRB
  38. GRB050724: VLT observations of the variable source
  39. GRB050709: Second Epoch Chandra Observation
  40. GRB050726: Swift-BAT detection of a weak burst
  41. GRB 050724: Optical Variability in Nearby Galaxy
  42. GRB 050724: J-band observations
  43. GRB 050724: GMOS Imaging and Spectroscopy
  44. GRB050724: Radio Observation
  45. GRB 050724: Optical imaging/astrometry
  46. GRB 050724: Swift/UVOT Upper Limit
  47. GRB050724: Refined analysis of the Swift-BAT possible short burst
  48. GRB 050724: possible host galaxy in DSS
  49. GRB 050721A: Swift-BAT refined analysis
  50. GRB 050721A: Early Swift XRT analysis results
  51. GRB050721A: optical decay
  52. GRB 050721: optical afterglow confirmed
  53. GRB 050709: Refined Spectral and Temporal Properties
  54. GRB050714b: Radio Observation
  55. GRB050712: Radio Observations
  56. GRB050713a: Radio Observation
  57. GRB 050712, Tautenburg optical afterglow observations
  58. Swift-BAT detection of a possible GRB
  59. GRB 050714B: VLT R-band observations
  60. GRB 050717: Additional LCO observations
  61. GRB 050716; J-band observations
  62. GRB 050717: LCO near-IR observations
  63. Swift/UVOT Observations of GRB 050717
  64. GRB 050717: Swift-BAT refined analysis
  65. GRB050717: Swift XRT position
  66. Swift detection of GRB 050717
  67. Swift UVOT Observations of GRB 050716
  68. GRB 050716: Refined XRT analysis.
  69. GRB050716: Refined analysis of the Swift-BAT burst
  70. GRB 050716: Lulin B and R band optical observations
  71. GRB050716, optical observation
  72. GRB050716: Faulkes North Telescope observation
  73. GRB050715: Refined analysis of the Swift-BAT burst
  74. GRB 050715: Swift-BAT detection
  75. GRB 050713b: RTT150 optical observations
  76. GRB050714B: Refined analysis of the Swift-BAT burst
  77. GRB 050714B: optical afterglow
  78. GRB 050714, R-band candidate
  79. GRB 050714, optical observations
  80. GRB 050713A: XRT refined analysis
  81. GRB 050713A: RAPTOR detection of early optical emission
  82. GRB050713B :Swift/UVOT observations
  83. GRB050713b: XRT refined analysis
  84. GRB050712: TNG R-band observations
  85. GRB 050713B: Swift-BAT Refined Analysis
  86. GRB 050713A: Swift/UVOT observation
  87. GRB 050713A : Swift-BAT Refined Analysis
  88. GRB050712: Swift UVOT Observation of Afterglow Emission
  89. GRB 050713A : Lulin R-band observation
  90. GRB 050713A XMM-Newton observation
  91. GRB 050713b : Lulin R-band observations
  92. GRB050713B: Faulkes North Telescope observation
  93. RBO RI observations of GRB 050713A
  94. GRB 050713B
  95. GRB050709 : Chandra source optical counterpart
  96. GRB050713: Liverpool Telescope prompt observations
  97. GRB 050712, optical observations
  98. GRB050709: Candidate X-ray Afterglow from Chandra
  99. GRB050713: possible I-band afterglow
  100. GRB050712: XRT refined analysis

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