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"

28118 results found.

  1. GRB 061110B: Swift detection of a burst
  2. GRB 061110: Candidate confirmed
  3. GRB 061110 : Optical afterglow candidate
  4. GRB 061110: ROTSE-III Optical Limits
  5. GRB 061110: Swift detection of a burst
  6. GRB061110A - Optical Non-detection
  7. GRB 061109: optical observation
  8. GRB 061109: TAROT Calern observatory optical observations
  9. GRB 061027: TAROT La Silla observatory optical observations
  10. GRB 061028: Swift/XRT Astrometry Correction
  11. GRB 061102: Swift/UVOT Magnitude Upper Limits
  12. GRB 061102, XRT refined analysis
  13. GRB061102B: Super-LOTIS observations
  14. GRB 061028: Optical R passband observations
  15. GRB 061102B: Swift detection of a possible burst
  16. GRB 061102, Swift-BAT refined analysis
  17. GRB 061102: Swift detection of a burst
  18. GRB 061028: VLA Observation
  19. GRB 061004: Swift/XRT Astrometry Correction
  20. GRB 060801: Swift/XRT Astrometry Correction
  21. GRB 061028: Futher P200 Observations
  22. GRB 061028: P200 Observations
  23. GRB 061028: SARA upper limit
  24. GRB 061028: z band imaging
  25. GRB061028: XRT refined analysis
  26. GRB 061028: Swift/UVOT Observations
  27. GRB 061028, Swift-BAT refined analysis
  28. GRB 061028: TAROT Calern observatory optical observations
  29. GRB 061028: Swift detection of a burst
  30. GRB 061027, Swift refined analysis of a possible burst
  31. GRB 061027: Swift detection of a possible burst
  32. GRB061025: Swift XRT refined analysis
  33. GRB061025: Swift/UVOT observations
  34. GRB 061025: REM observations
  35. GRB 061025: ROTSE-III Optical Limits
  36. GRB 061025: a long GRB detected by INTEGRAL
  37. Swift XRT boresight update
  38. GRB 061021: Swift/UVOT Observation
  39. GRB 061021, Swift-BAT refined analysis
  40. GRB 061021: Swift detection of a burst
  41. GRB061019: optical observations
  42. GRB 061019: SARA upper limit
  43. GRB 061019: Swift/UVOT upper limit
  44. GRB 061019: SMARTS afterglow confirmation
  45. GRB061019: Swift XRT refined analysis
  46. GRB 061019, Swift-BAT refined analysis
  47. GRB 061019: TAROT La Silla observatory optical observations
  48. GRB 061019: REM K-band candidate afterglow
  49. GRB 061007: Second Epoch ATCA Radio Observations
  50. GRB 061007: Suzaku/WAM observation of the prompt emission
  51. GRB 061006: astrometry-corrected XRT position
  52. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  53. GRB 061007: ATCA Radio Observations
  54. GRB061007: Swift UVOT followup observations
  55. GRB 061006: optical afterglow
  56. GRB 061007: OA fading and VLT redshift
  57. GRB 061007: Correction to GCN 5712
  58. GRB 061007: Swift-BAT refined analysis
  59. GRB 061007: Swift XRT refined analysis
  60. GRB 061006: Swift/UVOT optical observations
  61. GRB 061007: Swift detection of a burst with an optical counterpart
  62. GRB 061007: ROTSE-III Detection of Optical Counterpart
  63. GRB 061006: VLT observation
  64. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  65. GRB 061006: Swift-XRT Team Refined Analysis
  66. GRB061006 (Swift 232585) might be a short-hard GRB
  67. GRB 060930: near-IR afterglow candidate retraction
  68. GRB 061004: Optical afterglow candidate and redshift
  69. GRB 061004: Swift-XRT Team Refined Analysis
  70. GRB 061004, Swift BAT refined analysis
  71. GRB 061004: Swift detection of a burst
  72. GRB 060928: Suzaku/WAM observation of the prompt emission
  73. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  74. GRB 060928: Swift observations
  75. IPN triangulation of GRB060928 (long, exceptionally bright)
  76. GRB 060930: near-IR afterglow candidate
  77. GRB 061002: Swift-XRT Team Refined Analysis
  78. VLA observations of GRB 060926
  79. GRB061002 - SDSS Pre-Burst Observations
  80. GRB 061002, Swift-BAT refined analysis
  81. GRB 060908: Detection of a possible host
  82. GRB 060807: Detection of a possible host galaxy
  83. GRB 060923A: VLA K-band Observations
  84. GRB 060930: Xinglong TNT optical observations
  85. GRB 060929: Further XRT Refined Analysis
  86. GRB 060929: Swift/UVOT Optical Observations
  87. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  88. GRB060929: Swift-XRT refined analysis.
  89. GRB 060929: TNG K-band observations
  90. GRB 060929, Swift-BAT refined analysis
  91. GRB060929: Optical limit
  92. Liverpool Telescope observations of GRB 060929
  93. GRB060908: optical observations
  94. GRB 060927: Swift/UVOT Optical Observations
  95. GRB 060927: Swift XRT Team refined analysis
  96. GRB 060927 optical limit
  97. GRB 060927, Swift-BAT refined analysis
  98. GRB 060927: Xinglong TNT optical observations
  99. GRB 060927, optical observation
  100. GRB060927 - SDSS Pre-Burst 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