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"

36114 results found.

  1. GRB050801: Unchanged decay slope
  2. GRB 050730: OHP optical observations
  3. GRB 050802: early Swift XRT analysis results
  4. GRB 050802: Swift/UVOT observations
  5. GRB 050802 : Lulin Optical follow-up observation
  6. GRB 050802: Swift-BAT refined analysis
  7. GRB050801: Optical photometry and decay index
  8. GRB 050802: XRT position
  9. GRB 050802: Swift Gamma-ray Burst
  10. GRB 050730: Preliminary Analysis of MIKE Spectrum
  11. GCN 050801: early Swift XRT analysis results
  12. GRB 050801: Swift-BAT refined analysis
  13. GRB 050801, SMARTS optical/IR afterglow observations
  14. GRB 050801, afterglow observations
  15. GRB 050730, corrected photometry and break?
  16. GRB 050801: ROTSE-III Early Afterglow Break
  17. GRB050801: Swift-BAT detection of a burst
  18. GRB 050801: ROTSE-III Detection of Possible Counterpart
  19. GRB 050730: XRT refined analysis
  20. Correction to GCN Circ 3476 on GRB050525A
  21. GRB 050730: early TAROT optical observations
  22. GRB 050726: PROMPT Rc Observations
  23. GRB 050730: RTT150 optical observations
  24. GRB 050730, spectra and optical photometry
  25. GRB050730: Refined BAT analysis of the Swift-BAT burst
  26. GRB 050730: Swift XRT afterglow observations
  27. GRB 050730 XMM-Newton observation
  28. GRB 050730: PROMPT VRcIc Observations
  29. GRB050730, afterglow observations
  30. GRB050730: confirmation of redshift
  31. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  32. GRB 050730, SMARTS optical/IR afterglow observations
  33. GRB 050730 : Planned XMM-Newton observation
  34. GRB050730: Liverpool Telescope optical observations
  35. GRB 050730, optical candidate
  36. GRB050730: Swift-BAT detection of a weak burst
  37. GRB 050713A: Swift XRT extended light curve
  38. GRB 050709: PROMPT Rc Observations
  39. GRB050713b: Maidanak optical observations
  40. GRB 050724: Secure Host Redshift from Keck
  41. GRB 050724: WHT optical observations
  42. GRB 050724: Chandra Observations of the X-ray Afterglow
  43. GRB050713: analysis of the XMM-Newton observation
  44. GRB 050724, SMARTS optical/IR afterglow observations
  45. GRB 050726, SMARTS optical/IR observations
  46. Swift-BAT trigger 147918 is not a real GRB
  47. GRB 050727: RTT150 optical observations
  48. GRB050727: KAIT optical limit
  49. GRB050709: Second Epoch Chandra Observation
  50. GRB 050726: PROMPT Rc Observations
  51. GRB050709: Second Epoch Chandra Observation
  52. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  53. GRB 050726: early Swift XRT analysis results
  54. GRB 050724: Optical Variability in Nearby Galaxy
  55. GRB 050724: J-band observations
  56. GRB 050724: GMOS Imaging and Spectroscopy
  57. GRB 050724: SWIFT XRT refined position
  58. GRB 050724: spectroscopy of object in the XRT error circle
  59. GRB 050724: Optical limit
  60. GRB 050724: optical and near-IR observations
  61. GRB 050724: Optical imaging/astrometry
  62. GRB 050724: RTT150 optical observations
  63. GRB 050724: Swift/UVOT Upper Limit
  64. GRB 050724: early Swift XRT analysis results
  65. GRB 050724 : Lulin early R-band monitoring observations
  66. GRB050724: Refined analysis of the Swift-BAT possible short burst
  67. GRB 050724: possible host galaxy in DSS
  68. Swift-BAT trigger 147325 is not due to a real GRB
  69. GRB050723: XRT distributed coordinates are not related to the burst
  70. GRB 050721: early afterglow light curve
  71. GRB 050721A: Swift-BAT refined analysis
  72. Correction to GCN Circ 3474 on GRB050525A
  73. GRB 050721A: Early Swift XRT analysis results
  74. GRB050721A: optical decay
  75. GRB 050721: optical afterglow confirmed
  76. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  77. GRB 050721a: Optical Observations
  78. GRB 050709: Refined Spectral and Temporal Properties
  79. GRB 050717: PROMPT RcIc Observations
  80. GRB 050714a: Refined XRT analysis and afterglow confirmation
  81. Swift-BAT trigger 146731 is not a real GRB
  82. GRB 050712, Tautenburg optical afterglow observations
  83. Swift-BAT detection of a possible GRB
  84. GRB 050714B: VLT R-band observations
  85. GRB 050717: Additional LCO observations
  86. GRB050717
  87. GRB 050716; J-band observations
  88. Konus-Wind observation of GRB 050717
  89. GRB 050717: LCO near-IR observations
  90. Swift/UVOT Observations of GRB 050717
  91. GRB 050717: Swift-BAT refined analysis
  92. GRB 050717: Refined XRT analysis.
  93. GRB050712: optical limits
  94. Swift detection of GRB 050717
  95. GRB 050716 - UKIRT identification of candidate afterglow
  96. Swift UVOT Observations of GRB 050716
  97. GRB 050716: Refined XRT analysis.
  98. GRB 050716: Lulin B and R band optical observations
  99. GRB050716, optical observation
  100. GRB 050716: Optical Observations

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