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"

36314 results found.

  1. GRB 011121
  2. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE
  3. GRB 011121: J-band observations
  4. GRB 011121: NIR observations, host galaxy?
  5. GRB 011121: HST Scheduled
  6. GRB011121: fainter still
  7. Correction: GCN1157 (GRB 011121)
  8. GRB 011121: Radio Observations
  9. GRB 011121 J-Band Astrometry
  10. GRB011121: continued decay
  11. GRB 011121: Detection of Bright IR Counterpart
  12. GRB011121: possible redshift, continued decay
  13. IPN triangulation of GRB011121
  14. BEPPOSAX GRB011121
  15. GRB 011030: TNG K-band observation
  16. XRF011030: Chandra Observations
  17. GRB 011030: K-band observations
  18. GRB 011030 R band observations
  19. GRB 011030 I-band Observation
  20. The X-ray Flash 011030 ('GRB 011030')
  21. Non-triggered burst 011030 ("GRB 011030")
  22. The Radio Afterglow from the X-ray Rich GRB 011030
  23. GRB 010921: HST Detection of the Afterglow and Host Galaxy
  24. GRB 970828: HST Observations of the Host Galaxy
  25. GRB 000131: HST Detection of the Host Galaxy
  26. GRB 970828: HST Observations of the Host Galaxy
  27. GRB010921, optical observation
  28. GRB 011019 optical observation
  29. GRB011019: Subaru Optical Observations
  30. GRB 011030 I-band Observations
  31. GRB 011030 K-band Observations
  32. GRB010921, optical observations
  33. GRB 011030, WSRT radio observations
  34. GRB011030 - further refinement WFC position
  35. GRB 011030, Radio observations
  36. GRB 011030, R-band observations
  37. BeppoSAX ALERT: Possible X-ray rich GRB011030
  38. GRB 010921: Possible supernova component
  39. GRB011019: NEAT Optical Observations
  40. GRB010921, optical observation at early time
  41. GRB 010921, I-band observations
  42. GRB011019: Optical observations
  43. GRB011019, optical observations
  44. GRB011019: A Faint, X-ray Rich GRB localized by HETE
  45. GRB010921: Spectroscopy of the Host Galaxy
  46. GRB 010921: The afterglow of HETE #1761
  47. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  48. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  49. GRB010923 as seen by BeppoSAX GRBM
  50. GRB010928(=H1770): Localization of a Long GRB by HETE
  51. GRB010923(=H1764): A Short Duration GRB Detected by HETE
  52. GRB010921, negative optical observations
  53. GRB010921 field photometry
  54. GRB010921 Optical Observations
  55. GRB 010921 DPOSS Images Available
  56. IPN triangulation of GRB010921 (=H1761)
  57. H1761: A Bright GRB Detected by HETE
  58. HETE Trigger #1760 (GRB 010920B?): new optical source = asteroid
  59. HETE Trigger #1760 (GRB 010920B?): a new optical source
  60. HETE Trigger #1759 (GRB 010920?) optical observations
  61. GRB001109, Host Galaxy Astrometry
  62. GRB000926, Host Galaxy Observations
  63. GRB001109, Host Galaxy Spectroscopic Observations
  64. Probable SGR or Short Duration GRB Detected by HETE
  65. GRB000926 Host Galaxy Observations
  66. GRB 010222: HST observations -- host galaxy and late-time decay
  67. BeppoSAX/GRBM detection of GRB 010801
  68. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  69. GRB 010222 - WHT BVRI images
  70. GRB 010629 Optical Observations
  71. GRB010629: Optical Observations
  72. GRB010629, optical observations
  73. IPN triangulation of GRB010629
  74. GRB010629: A Burst Localized by HETE
  75. Possible burst from SGR1806-20
  76. IPN detection of SGR1900+14
  77. GRB 00630: Host Galaxy
  78. IPN triangulation of GRB010613
  79. IPN triangulation of GRB010612
  80. HETE Fully-Automated GCN Notices
  81. GRB000301C: Late-time HST/STIS observation
  82. GRB010518: a faint BeppoSAX detection
  83. GRB000418: HST/STIS Second-epoch Observations
  84. GRB010427, Gamma Ray Observations
  85. SGR1900+14
  86. GRB 010222 /corrections to VBT data
  87. Possible precursor to the SGR1900+14 giant burst
  88. IPN Triangulation of the Giant Flare from SGR1900+14
  89. GRB010412, field photometry
  90. GRB 010326b Optical Observations
  91. GRB010412: Optical observations
  92. GRB010412: Optical observations
  93. IPN Triangulation of GRB010412
  94. BeppoSAX GRB: extension of BSAX operations upto April 30, 2002
  95. BeppoSAX GRB ALERT: GRB010412
  96. GRB Observation Report
  97. GRB010324, revised field photometry
  98. REVISED LOCATION OF GRB010326A
  99. GRB 980326: Late-time HST/STIS observations
  100. GRB010324, field photometry

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