Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

27011 results found.

  1. GRB021211, OT at 108 s
  2. HETE 2493: Optical observations
  3. HETE 2493: Optical candidate
  4. GRB 021204: Optical Observations at RIKEN
  5. GRB 021201: BOOTES simultaneous optical observations
  6. GRB 021112: RAPTOR Observations
  7. GRB021104: Optical Observations
  8. SGR1900+14 activity, November 2-4, 2002
  9. GRB021104: possible optical afterglow
  10. GRB 021016, optical observations
  11. GRB 021004: VRI observations at TNG: possible break
  12. GRB 021008, optical observations
  13. IPN triangulation of GRB021014 (large error box)
  14. GRB 021004: Additional V-band Polarimetric Observations
  15. GRB 021004 - Unusual Radio-to-Submm Spectrum
  16. GRB 021004: V-band Polarimetric Observations
  17. IRAM Millimeter detection of GRB 021004
  18. GRB 021004: Optical observations at RIKEN
  19. GRB 021004, SPM optical observations
  20. GRB021004: optical observations at Nyrola
  21. GRB021004: Optical Afterglow
  22. GRB 020903: Optical observations at RIKEN
  23. XRF 020903: Supernova
  24. IPN triangulation of GRB020914
  25. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  26. INTEGRAL GRBs added to GCN
  27. GRB020812: optical observation
  28. Second epoch K band imaging of GRB 020819
  29. K band observation of GRB 020819
  30. HETE 2275: Optical observations
  31. Polarimetry of GRB020813: evidence for variability
  32. GRB020812: optical observations
  33. GRB020813: Early Time Magnitude
  34. GRB020813, optical observations
  35. Early Time Limits for GRB020813
  36. GRB 020813 Afterglow Observations; Possible break
  37. GRB 020813 multiband optical observations
  38. GRB020813: optical afterglow
  39. GRB020813: Fading of Candidate OT
  40. GRB020813: Candidate Optical Afterglow
  41. GRB 020812 optical observation
  42. GRB020801, optical afterglow candidate
  43. GRB020625 (=H2081): A Long Burst Localized by HETE
  44. HETE #2081: Optical observations
  45. GRB 020531, simultaneous optical observations
  46. GRB020321 : Optical observations.
  47. XRF 020427
  48. GRB 020410, optical observations
  49. GRB 020331: Candidate Optical Afterglow
  50. GRB 020322: BeppoSAX observations of the X-ray afterglow
  51. SN 2002ap - peak brightness date (SN/GRB?)
  52. GRB020321: a faint BeppoSAX detection
  53. GRB020317, optical observations
  54. GRB020305, optical observations
  55. GRB020124, optical observations
  56. HETE 1896: Optical observations
  57. GRB 011130, Radio/X-ray Comparison
  58. GRB011130 (=XRF011130), Optical Observations
  59. GRB001109, Radio Monitoring
  60. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE
  61. GRB 011030: K-band observations
  62. The X-ray Flash 011030 ('GRB 011030')
  63. The Radio Afterglow from the X-ray Rich GRB 011030
  64. GRB 011019 optical observation
  65. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  66. GRB 010921: The afterglow of HETE #1761
  67. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  68. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  69. GRB010921 Optical Observations
  70. HETE Trigger #1760 (GRB 010920B?): new optical source = asteroid
  71. HETE Trigger #1760 (GRB 010920B?): a new optical source
  72. HETE Trigger #1759 (GRB 010920?) optical observations
  73. BeppoSAX/GRBM detection of GRB 010801
  74. GCN and HETE status
  75. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  76. BeppoSAX/GRBM detection of GRB010728
  77. SGR1900+14 burst seen by HETE: BeppoSAX data
  78. GRB 010629 Optical Observations
  79. SGR1900+14: High Fluence Burst Localized by HETE
  80. GRB010629: A Burst Localized by HETE
  81. SGR1900+14: Second Burst Localized by HETE
  82. SGR1900+14: A Burst Localized by HETE
  83. SGR1806-20: A Second, Intense Burst Localized by HETE
  84. SGR1806-20: Localization by HETE
  85. IPN triangulation of GRB010613
  86. IPN triangulation of GRB010612
  87. GRB010518: a faint BeppoSAX detection
  88. Giant flare from SGR1900+14
  89. GRB010412: BeppoSAX GRBM and WFC observations
  90. GRB010324: BeppoSAX/GRBM data
  91. GRB010326B: Localization by HETE (2nd GRB for this date)
  92. GRB010326: Refined Localization by HETE
  93. GRB010326: Localization by HETE
  94. Sub-millimeter Excess/GRB 010222
  95. GRB010220: BeppoSAX WFC and GRBM preliminary data
  96. GRB010214: BeppoSAX WFC and GRBM preliminary data
  97. GRB 010214: X-Ray afterglow
  98. GRB010213, optical observations
  99. GRB010213 detected by HETE
  100. HETE Status

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