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"

45674 results found.

  1. GRB 060929, Swift-BAT refined analysis
  2. GRB060929: Optical limit
  3. GRB 060929: BART observation
  4. GRB 060929: MASTER-VWF-Kislovodsk observations
  5. GRB 060929: BOOTES-IR & OSN observations
  6. Liverpool Telescope observations of GRB 060929
  7. GRB 060929: Swift detection of a burst
  8. GRB060908: optical observations
  9. GRB 060729: An update on the late-time Swift observations
  10. GRB 060927: Spectroscopic redshift z=5.6
  11. IBAS Alert n.3501: not a GRB
  12. IBAS Alert n.3500: not a GRB
  13. GRB060923C: optical limit
  14. GRB060927: optical observations
  15. test of new software, grb
  16. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  17. GRB 060927: pseudo-z from spectral parameters of the prompt emission
  18. GRB 060927: Swift/UVOT Optical Observations
  19. GRB 060927: Early color
  20. GRB 060927: Swift XRT Team refined analysis
  21. GRB 060927 optical limit
  22. GRB 060927, Swift-BAT refined analysis
  23. GRB 060927: Xinglong TNT optical observations
  24. GRB060926: improved redshift
  25. GRB 060927, optical observation
  26. GRB 060927: Possible host galaxy (star?) in the SDSS
  27. GRB 060927 : Kiso optical observation
  28. GRB060927: Faulkes Telescope South observation
  29. GRB 060926: MASTER: first minutes decay
  30. GRB060927 - SDSS Pre-Burst Observations
  31. GRB 060927: optical afterglow confirmation
  32. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  33. Swift XRT boresight
  34. GRB 060927: Swift detection of a burst
  35. GRB060926: VLT redshift
  36. GRB 060926: Swift-UVOT Detections
  37. GRB 060923A: Schedule of Spitzer Space Telescope Observations
  38. GRB 060926: OPTIMA-Burst -- further observations
  39. GRB 060926: Swift XRT refined analysis
  40. GRB 060926, Swift-BAT refined analysis
  41. GRB 060923A: Radio Observations
  42. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  43. GRB 060912A: Redshift of probable host galaxy
  44. GRB 060926: BOOTES-IR observations
  45. GRB 060926: Watcher observations
  46. GRB060926 OPTIMA-Burst optical observation
  47. GRB 060926: Swift detection of a burst
  48. GRB 060923C, Swift-BAT refined analysis
  49. GRB 060923C: VLA Observation
  50. GRB 060923C: NIR afterglow confirmed
  51. GRB060923C: AROMA optical obsevation
  52. GRB 060923C: Gemini Observations and Afterglow Candidate
  53. GRB 060923C, optical observation
  54. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  55. GRB 060923C: VLT J-band observations
  56. GRB060923B: Swift/UVOT upper limits
  57. GRB 060923B: Swift XRT Refined Analysis
  58. GRB 060923C: Swift XRT refined analysis
  59. GRB 060923C, Swift-BAT partial refined analysis
  60. GRB 060923A: Swift XRT refined analysis
  61. GRB 060923C: Keck Observations
  62. GRB 060923A: Keck and Gemini Observations
  63. GRB 060923C: Xinglong TNT optical observations
  64. GRB 060923B, Swift-BAT refined analysis
  65. GRB060923C : Faulkes Telescope South optical limits
  66. GRB060923C: Faulkes Telescope North optical observations
  67. GRB 060923C: optical observation
  68. GRB 060923C: Swift detection of a burst
  69. GRB 060923B: Swift detection of a burst
  70. GRB 060923, Swift-BAT refined analysis
  71. GRB 060923: Early Super-LOTIS Observations
  72. GRB 060923: UKIRT nIR observations - candidate afterglow
  73. GRB060923: Faulkes Telescope North optical observations
  74. GRB060923 - SDSS Pre-Burst Observations
  75. GRB 060923: KAIT observations
  76. GRB 060923: Swift detection of a burst
  77. Swift detection of IGR J17497-2821 (trigger 230504)
  78. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  79. GRB060919: Swift/UVOT optical observations
  80. GRB 060919 : Faulkes South Telescope Observations
  81. GRB 060919, Swift-BAT refined analysis
  82. GRB060919: XRT refined analysis
  83. GRB 060919: TAROT optical observations
  84. GRB 060919: Swift detection of a burst
  85. GRB 060912A: VLA Observation
  86. GRB 060912A: Probable Host Galaxy
  87. IBAS Alert n.3470: not a GRB
  88. GRB060825: MAGIC telescope GeV observation
  89. Konus-Wind observation of GRB 060912
  90. IBAS Alert No.3468: not a GRB
  91. GRB 060912: Redshift of nearby 2MASS galaxy
  92. GRB060912: optical observations
  93. GRB 060912B: Watcher observations
  94. GRB060912: Swift/UVOT Observations
  95. GRB060912: OPTIMA-Burst optical observations
  96. GRB 060912B: a long GRB detected with INTEGRAL
  97. GRB 060912: Swift XRT Team Refined Analysis
  98. GRB 060912, Swift-BAT refined analysis
  99. GRB 060912: Correction to GCN 5559
  100. GRB 060912: Swift detection of a burst with an optical afterglow

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