Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

41978 results found.

  1. GRB 061027: TAROT La Silla observatory optical observations
  2. GRB 061007: Third Epoch ATCA Radio Observations
  3. GRB061019: second epoch CrAO observations
  4. GRB 061028: Swift/XRT Astrometry Correction
  5. GRB 061102, XRT refined analysis
  6. GRB 061004: Further VLT/NTT observations
  7. GRB061102B: Super-LOTIS observations
  8. GRB 061028: Optical R passband observations
  9. GRB 061102B: Swift detection of a possible burst
  10. GRB 061102: Swift detection of a burst
  11. GRB 061028: VLA Observation
  12. GRB 061004: Swift/XRT Astrometry Correction
  13. GRB 060801: Swift/XRT Astrometry Correction
  14. GRB 061028: Futher P200 Observations
  15. GRB 061028: MDM Observations
  16. GRB 061028: P200 Observations
  17. GRB 061028: SARA upper limit
  18. GRB 061028: z band imaging
  19. GRB061028: XRT refined analysis
  20. GRB 061028: Swift/UVOT Observations
  21. GRB 061028: TAROT Calern observatory late optical observations
  22. GRB 061028: TAROT Calern observatory optical observations
  23. GRB 061028: Swift detection of a burst
  24. GRB 061027: Swift detection of a possible burst
  25. GRB061025: ROTSE-III Confirmation of Optical Counterpart
  26. GRB061025: Swift XRT refined analysis
  27. GRB061025: Swift/UVOT observations
  28. GRB 061019: MITSuME upper limits
  29. GRB 061025: REM observations
  30. GRB 061025: Gemini-S observations
  31. GRB061025: Swift XRT position
  32. GRB 061025: a long GRB detected by INTEGRAL
  33. GRB 061021, Swift-BAT Lag analysis
  34. Konus-Wind observation of GRB 061021
  35. GRB 061021 - VLT spectrum without lines
  36. GRB 061021: Swift-XRT refined analysis
  37. GRB 061021: Swift/UVOT Observation
  38. GRB 061021: Swift detection of a burst
  39. GRB 061019: Super-LOTIS upper limit
  40. GRB060904b: optical observations
  41. GRB061019: optical observations
  42. GRB061019: optical observations
  43. GRB 061019: SARA upper limit
  44. GRB 060930: MARGE Optical Limits
  45. GRB 061019: Swift/UVOT upper limit
  46. GRB 061019: SMARTS afterglow confirmation
  47. GRB061019: Swift XRT refined analysis
  48. GRB 061019: TAROT La Silla observatory optical observations
  49. GRB 061019: REM K-band candidate afterglow
  50. GRB061019: Swift/XRT position
  51. GRB 061019: Swift-BAT detection of a burst
  52. GRB 060825: GORT Observations
  53. GRB 061007: Second Epoch ATCA Radio Observations
  54. GRB 061007: RHESSI Spectral Fit
  55. GRB 061007: Suzaku/WAM observation of the prompt emission
  56. GRB 061006: astrometry-corrected XRT position
  57. Konus-Wind observation of GRB 061007
  58. GRB 061007: ATCA Radio Observations
  59. GRB061007: Swift UVOT followup observations
  60. GRB 061006: optical afterglow
  61. GRB 061006 : Suzaku/WAM observation of the prompt emission
  62. GRB 061007: OA fading and VLT redshift
  63. GRB 061007: Magellan Spectroscopy
  64. GRB 061007: Swift-BAT refined analysis
  65. GRB 061007: Swift XRT refined analysis
  66. GRB 061006: Swift/UVOT optical observations
  67. Konus-Wind observation of the short hard GRB 061006
  68. GRB 061007 - FTS early brightening and power law decay
  69. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  70. GRB 061007: Swift detection of a burst with an optical counterpart
  71. GRB 061007: ROTSE-III Detection of Optical Counterpart
  72. GRB 061006: VLT observation
  73. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  74. GRB 061006: Swift-XRT Team Refined Analysis
  75. GRB061006 (Swift 232585) might be a short-hard GRB
  76. GRB 060930: near-IR afterglow candidate retraction
  77. GRB061006: Faulkes Telescope South Observations
  78. GRB 061006: Swift detection of a burst
  79. GRB 061004: Optical afterglow candidate and redshift
  80. GRB 061004: Las Campanas Optical/NIR Observations
  81. GRB061004: Swift/UVOT optical observations
  82. GRB 061004: Swift-XRT Team Refined Analysis
  83. GRB 060928: Correction to GCN 5690
  84. GRB 061004: Swift detection of a burst
  85. GRB 060928: 2 pseudo-z from 2 detections spectral parameters
  86. Konus-Wind observation of GRB 060928
  87. GRB 060928: Suzaku/WAM observation of the prompt emission
  88. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  89. GRB 060928: Swift observations
  90. GRB 060928: RHESSI Spectral Fit
  91. GRB061002: Swift UVOT followup observations
  92. GRB 060930: near-IR afterglow candidate
  93. GRB 061002: Swift-XRT Team Refined Analysis
  94. VLA observations of GRB 060926
  95. GRB061002 - SDSS Pre-Burst Observations
  96. GRB061002: MASTER-VWF-Kislovodsk observations
  97. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  98. GRB 061002: Swift detection of a burst
  99. GRB 060908: Detection of a possible host
  100. GRB 060923A: Probable host galaxy in the R-band

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