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"

32693 results found.

  1. GRB 061019: REM K-band candidate afterglow
  2. GRB061019: Swift/XRT position
  3. GRB 060825: GORT Observations
  4. GRB 061007: Second Epoch ATCA Radio Observations
  5. GRB 061007: RHESSI Spectral Fit
  6. GRB 061007: Suzaku/WAM observation of the prompt emission
  7. GRB 061006: astrometry-corrected XRT position
  8. Konus-Wind observation of GRB 061007
  9. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  10. GRB 061007: ATCA Radio Observations
  11. GRB061007: Swift UVOT followup observations
  12. GRB 061006: optical afterglow
  13. GRB 061007: OA fading and VLT redshift
  14. GRB 061007: Magellan Spectroscopy
  15. GRB 061007: Correction to GCN 5712
  16. GRB 061007: Swift-BAT refined analysis
  17. GRB 061007: Swift XRT refined analysis
  18. GRB 061006: Swift/UVOT optical observations
  19. Konus-Wind observation of the short hard GRB 061006
  20. GRB 061007 - FTS early brightening and power law decay
  21. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  22. GRB 061007: ROTSE-III Detection of Optical Counterpart
  23. GRB 061006: VLT observation
  24. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  25. GRB 061006: Swift-XRT Team Refined Analysis
  26. GRB061006 (Swift 232585) might be a short-hard GRB
  27. GRB061006: Faulkes Telescope South Observations
  28. GRB 061004: Optical afterglow candidate and redshift
  29. GRB 061004: Las Campanas Optical/NIR Observations
  30. GRB061004: Swift/UVOT optical observations
  31. GRB 061004: Swift-XRT Team Refined Analysis
  32. GRB 061004, Swift BAT refined analysis
  33. GRB 061004: Nearby 2MASS Galaxy
  34. GRB 060928: Correction to GCN 5690
  35. Konus-Wind observation of GRB 060928
  36. GRB 060928: Suzaku/WAM observation of the prompt emission
  37. GRB 060928: Swift observations
  38. GRB 060928: RHESSI Spectral Fit
  39. IPN triangulation of GRB060928 (long, exceptionally bright)
  40. GRB061002: Swift UVOT followup observations
  41. GRB 060930: near-IR afterglow candidate
  42. GRB 061002: Swift-XRT Team Refined Analysis
  43. VLA observations of GRB 060926
  44. GRB 061002, Swift-BAT refined analysis
  45. GRB 060908: Detection of a possible host
  46. GRB 060923A: Probable host galaxy in the R-band
  47. GRB 060807: Detection of a possible host galaxy
  48. GRB 060923A: VLA K-band Observations
  49. GRB060930: Faulkes Telescope South observation
  50. GRB 060929: Further XRT Refined Analysis
  51. GRB 060929: Swift/UVOT Optical Observations
  52. GRB 060930: ROTSE-III Optical Limits
  53. GRB 060927 : GAO 150cm telescope optical observation
  54. GRB060929: Swift-XRT refined analysis.
  55. GRB 060929, Swift-BAT further refined analysis - late-time flare
  56. GRB 060929: TNG K-band observations
  57. GRB 060929, Swift-BAT refined analysis
  58. GRB060929: Optical limit
  59. GRB 060929: BART observation
  60. GRB 060929: BOOTES-IR & OSN observations
  61. GRB060908: optical observations
  62. GRB 060729: An update on the late-time Swift observations
  63. GRB060923C: optical limit
  64. GRB060927: optical observations
  65. test of new software, grb
  66. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  67. GRB 060927: Swift/UVOT Optical Observations
  68. GRB 060927: Early color
  69. GRB 060927: Swift XRT Team refined analysis
  70. GRB 060927 optical limit
  71. GRB 060927, Swift-BAT refined analysis
  72. GRB060926: improved redshift
  73. GRB 060927, optical observation
  74. GRB 060927: Possible host galaxy (star?) in the SDSS
  75. GRB060927: Faulkes Telescope South observation
  76. GRB 060926: MASTER: first minutes decay
  77. GRB 060927: optical afterglow confirmation
  78. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  79. GRB060926: VLT redshift
  80. GRB 060926: Swift-UVOT Detections
  81. GRB 060923A: Schedule of Spitzer Space Telescope Observations
  82. GRB 060926: OPTIMA-Burst -- further observations
  83. GRB 060926: Swift XRT refined analysis
  84. GRB 060926, Swift-BAT refined analysis
  85. GRB 060923A: Radio Observations
  86. GRB 060926: MASTER OT alert observation
  87. GRB 060912A: Redshift of probable host galaxy
  88. GRB 060926: BOOTES-IR observations
  89. GRB060926 OPTIMA-Burst optical observation
  90. GRB 060926: MASTER optical observation
  91. GRB 060923C, Swift-BAT refined analysis
  92. GRB 060923C: VLA Observation
  93. GRB 060923C: NIR afterglow confirmed
  94. GRB060923C: AROMA optical obsevation
  95. GRB 060923C: Gemini Observations and Afterglow Candidate
  96. GRB 060923C, optical observation
  97. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  98. GRB 060923C: VLT J-band observations
  99. GRB060923B: Swift/UVOT upper limits
  100. GRB 060923B: Swift 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