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"

19643 results found.

  1. GRB 060927: Swift/UVOT Optical Observations
  2. GRB 060927: Swift XRT Team refined analysis
  3. GRB 060927, Swift-BAT refined analysis
  4. GRB060927: Faulkes Telescope South observation
  5. GRB060927 - SDSS Pre-Burst Observations
  6. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  7. Swift XRT boresight
  8. GRB 060927: Swift detection of a burst
  9. GRB060926: VLT redshift
  10. GRB 060926: Swift-UVOT Detections
  11. GRB 060926: Swift XRT refined analysis
  12. GRB 060926, Swift-BAT refined analysis
  13. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  14. GRB 060926: BOOTES-IR observations
  15. GRB060926 OPTIMA-Burst optical observation
  16. GRB 060926: Swift detection of a burst
  17. GRB 060923C, Swift-BAT refined analysis
  18. GRB 060923C: VLA Observation
  19. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  20. GRB060923B: Swift/UVOT upper limits
  21. GRB 060923B: Swift XRT Refined Analysis
  22. GRB 060923C: Swift XRT refined analysis
  23. GRB 060923C, Swift-BAT partial refined analysis
  24. GRB 060923A: Swift XRT refined analysis
  25. GRB 060923A: Keck and Gemini Observations
  26. GRB 060923B, Swift-BAT refined analysis
  27. GRB060923C : Faulkes Telescope South optical limits
  28. GRB060923C: Faulkes Telescope North optical observations
  29. GRB 060923C: Swift detection of a burst
  30. GRB 060923B: Swift detection of a burst
  31. GRB 060923, Swift-BAT refined analysis
  32. GRB 060923: Early Super-LOTIS Observations
  33. GRB060923: Faulkes Telescope North optical observations
  34. GRB 060923: KAIT observations
  35. GRB 060923: Swift detection of a burst
  36. Swift detection of IGR J17497-2821 (trigger 230504)
  37. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  38. GRB060919: Swift/UVOT optical observations
  39. GRB 060919, Swift-BAT refined analysis
  40. GRB060919: XRT refined analysis
  41. GRB 060919: TAROT optical observations
  42. GRB 060919: Swift detection of a burst
  43. GRB 060912A: VLA Observation
  44. GRB060825: MAGIC telescope GeV observation
  45. Konus-Wind observation of GRB 060912
  46. GRB060912: Swift/UVOT Observations
  47. GRB060912: OPTIMA-Burst optical observations
  48. GRB 060912: Swift XRT Team Refined Analysis
  49. GRB 060912, Swift-BAT refined analysis
  50. GRB 060912: Swift detection of a burst with an optical afterglow
  51. VLA observations of GRB 060908
  52. GRB 060908, Swift/XRT refined analysis
  53. GRB 060908: Swift/UVOT Observations
  54. GRB 060908, Swift-BAT refined analysis
  55. GRB 060908 - SDSS Pre-burst Observations
  56. GRB 060908: Swift detection of a burst with a bright optical counterpart
  57. GRB 060904A: Suzaku/WAM observation of the prompt emission
  58. GRB060904b optical detections (delayed report due to internet outage)
  59. GRB 060906: Early RAPTOR optical limits
  60. GRB 060906, Swift-BAT refined spectral analysis
  61. GRB 060906: Swift/XRT Refined Analysis
  62. GRB 060906: Swift-UVOT observations
  63. VLT redshift of GRB 060906
  64. GRB 060906, Swift-BAT refined analysis
  65. GRB 060906: KAIT observations
  66. GRB 060906 (?): P60 Optical Afterglow Candidate
  67. GRB 060906: Swift detection of a probable burst
  68. GRB 060904A Milagro GeV/TeV Observations
  69. GRB060904A: Swift/UVOT optical observations
  70. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  71. GRB 060904B: Swift-BAT refined analysis
  72. GRB060904b: Optical observations with Swift/UVOT
  73. Konus-Wind observation of GRB 060904A
  74. GRB 060904B: Swift-XRT refined analysis
  75. GRB 060904A: Refined analysis of the Swift-BAT burst
  76. GRB 060904A: Swift-XRT refined analysis
  77. GRB 060904A: Suzaku-XIS and -HXD observation plan
  78. GRB 060904B: Optical observations at Crni Vrh
  79. GRB060904B: Watcher observations
  80. GRB 060904B BOOTES-IR and 1.5m OSN observations
  81. GRB 060904B: TAROT optical counterpart observations
  82. GRB060904B - SDSS Pre-Burst Observations
  83. GRB 060904: TAROT optical observations
  84. GRB 060904B: Swift detection of a burst with optical counterpart
  85. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  86. GRB060904 - SDSS Pre-Burst Observations
  87. GRB 060904: Swift detection of a bright burst
  88. 060901: Swift UVOT followup observations
  89. GRB 060901: Swift/XRT Refined Analysis
  90. GRB 060901: Swift/XRT Position
  91. GRB 060604: VLA Observation
  92. GRB 060814: Suzaku/WAM observation of the prompt emission
  93. GRB 060605: VLA Observation
  94. GRB 060707: VLA observation
  95. GRB 060825: VLA observations
  96. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  97. Swift-BAT trigger 226614 is not a GRB
  98. GRB060826 - SDSS Pre-Burst Observations
  99. GRB 060826(?): Swift detection of a possible burst
  100. GRB 060825: XRT Team 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