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"

45721 results found.

  1. GRB 061019: TAROT La Silla observatory optical observations
  2. GRB 061019: REM K-band candidate afterglow
  3. GRB061019: Swift/XRT position
  4. GRB 061019: Swift-BAT detection of a burst
  5. GRB 060825: GORT Observations
  6. GRB 061007: Second Epoch ATCA Radio Observations
  7. GRB 061007: RHESSI Spectral Fit
  8. GRB 061007: Suzaku/WAM observation of the prompt emission
  9. GRB 061006: astrometry-corrected XRT position
  10. Konus-Wind observation of GRB 061007
  11. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  12. GRB 061007: ATCA Radio Observations
  13. GRB061007: Swift UVOT followup observations
  14. GRB 061006: optical afterglow
  15. GRB 061006 : Suzaku/WAM observation of the prompt emission
  16. GRB 061007: OA fading and VLT redshift
  17. GRB 061007: Magellan Spectroscopy
  18. GRB 061007: Correction to GCN 5712
  19. GRB 061007: Swift-BAT refined analysis
  20. GRB 061007: Swift XRT refined analysis
  21. GRB 061006: Swift/UVOT optical observations
  22. Konus-Wind observation of the short hard GRB 061006
  23. GRB 061007 - FTS early brightening and power law decay
  24. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  25. GRB 061007: Swift detection of a burst with an optical counterpart
  26. GRB 061007: ROTSE-III Detection of Optical Counterpart
  27. GRB 061006: VLT observation
  28. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  29. GRB 061006: Swift-XRT Team Refined Analysis
  30. GRB061006 (Swift 232585) might be a short-hard GRB
  31. GRB 060930: near-IR afterglow candidate retraction
  32. GRB061006: Faulkes Telescope South Observations
  33. GRB 061006: Swift detection of a burst
  34. GRB 061004: Optical afterglow candidate and redshift
  35. GRB 061004: Las Campanas Optical/NIR Observations
  36. GRB061004: Swift/UVOT optical observations
  37. GRB 061004: Swift-XRT Team Refined Analysis
  38. GRB 061004, Swift BAT refined analysis
  39. GRB 061004: Nearby 2MASS Galaxy
  40. GRB 060928: Correction to GCN 5690
  41. GRB 061004: Swift detection of a burst
  42. GRB 060928: 2 pseudo-z from 2 detections spectral parameters
  43. Konus-Wind observation of GRB 060928
  44. GRB 060928: Suzaku/WAM observation of the prompt emission
  45. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  46. GRB 060928: Swift observations
  47. GRB 060928: RHESSI Spectral Fit
  48. IPN triangulation of GRB060928 (long, exceptionally bright)
  49. GRB061002: Swift UVOT followup observations
  50. GRB 060930: near-IR afterglow candidate
  51. GRB 061002: Swift-XRT Team Refined Analysis
  52. VLA observations of GRB 060926
  53. GRB061002 - SDSS Pre-Burst Observations
  54. GRB 061002, Swift-BAT refined analysis
  55. GRB061002: MASTER-VWF-Kislovodsk observations
  56. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  57. GRB 061002: Swift detection of a burst
  58. GRB 060908: Detection of a possible host
  59. GRB 060923A: Probable host galaxy in the R-band
  60. GRB 060807: Detection of a possible host galaxy
  61. GRB 060923A: VLA K-band Observations
  62. GRB060930: Faulkes Telescope South observation
  63. GRB 060930: Xinglong TNT optical observations
  64. GRB 060929: Further XRT Refined Analysis
  65. GRB 060929: Swift/UVOT Optical Observations
  66. GRB 060930: ROTSE-III Optical Limits
  67. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  68. GRB 060927 : GAO 150cm telescope optical observation
  69. GRB060929: Swift-XRT refined analysis.
  70. GRB 060929, Swift-BAT further refined analysis - late-time flare
  71. GRB 060929: TNG K-band observations
  72. GRB 060929, Swift-BAT refined analysis
  73. GRB060929: Optical limit
  74. GRB 060929: BART observation
  75. GRB 060929: MASTER-VWF-Kislovodsk observations
  76. GRB 060929: BOOTES-IR & OSN observations
  77. Liverpool Telescope observations of GRB 060929
  78. GRB 060929: Swift detection of a burst
  79. GRB060908: optical observations
  80. GRB 060729: An update on the late-time Swift observations
  81. GRB 060927: Spectroscopic redshift z=5.6
  82. IBAS Alert n.3501: not a GRB
  83. IBAS Alert n.3500: not a GRB
  84. GRB060923C: optical limit
  85. GRB060927: optical observations
  86. test of new software, grb
  87. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  88. GRB 060927: pseudo-z from spectral parameters of the prompt emission
  89. GRB 060927: Swift/UVOT Optical Observations
  90. GRB 060927: Early color
  91. GRB 060927: Swift XRT Team refined analysis
  92. GRB 060927 optical limit
  93. GRB 060927, Swift-BAT refined analysis
  94. GRB 060927: Xinglong TNT optical observations
  95. GRB060926: improved redshift
  96. GRB 060927, optical observation
  97. GRB 060927: Possible host galaxy (star?) in the SDSS
  98. GRB 060927 : Kiso optical observation
  99. GRB060927: Faulkes Telescope South observation
  100. GRB 060926: MASTER: first minutes decay

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