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"

15282 results found.

  1. GRB 061214(?): Swift detection of a possible burst
  2. GRB 061210: Suzaku WAM observation of the prompt emission
  3. Swift/BAT trigger #250033 is due to a known source during loss of
  4. GRB 061126: a GRB detected off-axis by INTEGRAL
  5. GRB 061202: Suzaku WAM observation of the prompt emission
  6. GRB 061210: MDM Observation
  7. GRB061126: optical observations
  8. GRB061126: update on the Swift-XRT afterglow light curve
  9. Corrections for Swift/UVOT Exposure Times for GRBs 061110B and 061121
  10. Konus-Wind observation of GRB 061201
  11. GRB061202: Swift/UVOT Upper Limits
  12. GRB 061201: Swift XRT Team refined analysis
  13. GRB 061201: VLT optical observations
  14. GRB 061201: Swift detection of a short hard burst
  15. INT+WFC observations of GRB 061126
  16. GRB 061126: Possible Jet Break
  17. Swift XRT on-board boresight update
  18. GRB061121: optical observations
  19. GRB 061126: Early Super-LOTIS Observations
  20. GRB061126: Optical afterglow observations from MIRO
  21. GRB061126: Optical afterglow observations from MIRO
  22. GRB 061126 : SDSS Pre-Burst Observations
  23. GRB 061126: Swift/UVOT Observations
  24. GRB 061122: Confirmation of X-ray/Optical Afterglow
  25. GRB 061121: Ep,i - Eiso correlation
  26. GRB 061121: MDM Optical Decay
  27. GRB061121: P60 Observations
  28. GRB061122: Swift-XRT position
  29. Konus-Wind observation of GRB 061122
  30. Konus-Wind and Konus-A observations of GRB 061121
  31. INTEGRAL results on GRB 061122
  32. GRB 061121, Swift-BAT refined analysis
  33. GRB061121, optical observation
  34. GRB 061121: Optical observation at the KANATA 1.5m telescope
  35. GRB 050915B: optical afterglow
  36. GRB 060111B: Swift UVOT Refined Magnitudes
  37. GRB061110A: Correction to GCN5817
  38. GRB 061110A: refined R-band analysis
  39. Swift/UVOT Upper Limits for GRB061110b
  40. Swift/UVOT Upper Limits for GRB061110a
  41. GRB 061110B: Swift XRT refined analysis
  42. GRB 061110B: NOT optical observations
  43. GRB 061110: NOT observations
  44. GRB 061027: TAROT La Silla observatory optical observations
  45. GRB 061028: Swift/XRT Astrometry Correction
  46. GRB 061004: Further VLT/NTT observations
  47. GRB061102B: Super-LOTIS observations
  48. GRB 061004: Swift/XRT Astrometry Correction
  49. GRB 060801: Swift/XRT Astrometry Correction
  50. GRB 061028: MDM Observations
  51. GRB061025: ROTSE-III Confirmation of Optical Counterpart
  52. GRB061025: Swift/UVOT observations
  53. GRB 061025: REM observations
  54. GRB 061025: a long GRB detected by INTEGRAL
  55. Swift XRT boresight update
  56. Konus-Wind observation of GRB 061021
  57. GRB 061021 - VLT spectrum without lines
  58. GRB 061019: Super-LOTIS upper limit
  59. GRB 061019: dust-scattered X-ray halo detected in Swift/XRT
  60. GRB 061019: SMARTS afterglow confirmation
  61. GRB061019: Swift XRT refined analysis
  62. GRB061019: Swift/XRT position
  63. GRB 061007: Suzaku/WAM observation of the prompt emission
  64. GRB 061006: astrometry-corrected XRT position
  65. Konus-Wind observation of GRB 061007
  66. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  67. GRB061007: Swift UVOT followup observations
  68. GRB 061006: optical afterglow
  69. GRB 061006 : Suzaku/WAM observation of the prompt emission
  70. GRB 061007: Magellan Spectroscopy
  71. Konus-Wind observation of the short hard GRB 061006
  72. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  73. GRB 061006: Swift-XRT Team Refined Analysis
  74. GRB 060930: near-IR afterglow candidate retraction
  75. Konus-Wind observation of GRB 060928
  76. GRB 060928: Suzaku/WAM observation of the prompt emission
  77. GRB 060928: Swift observations
  78. IPN triangulation of GRB060928 (long, exceptionally bright)
  79. GRB061002 - SDSS Pre-Burst Observations
  80. GRB 060807: Detection of a possible host galaxy
  81. GRB 060930: Xinglong TNT optical observations
  82. GRB 060929: Further XRT Refined Analysis
  83. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  84. GRB 060729: An update on the late-time Swift observations
  85. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  86. GRB 060927: Early color
  87. GRB 060927: Swift XRT Team refined analysis
  88. GRB 060927 optical limit
  89. GRB 060927, optical observation
  90. GRB060927 - SDSS Pre-Burst Observations
  91. GRB 060927: optical afterglow confirmation
  92. GRB 060927: Swift detection of a burst
  93. GRB 060923C, Swift-BAT refined analysis
  94. GRB 060923C: Gemini Observations and Afterglow Candidate
  95. GRB 060923C, optical observation
  96. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  97. GRB 060923C: VLT J-band observations
  98. GRB 060923C: Swift XRT refined analysis
  99. GRB 060923A: Swift XRT refined analysis
  100. GRB 060923C: Keck 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