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"

24619 results found.

  1. GRB 020322 optical observations
  2. GRB 011121: Fourth Epoch of HST Imaging
  3. GRB020321: a faint BeppoSAX detection
  4. GRB 020317 : KISO Optical Observations
  5. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  6. GRB 020305: Optical Observations
  7. GRB020317, optical observations
  8. GRB 011121: Third HST Epoch
  9. GRB 011121: HST Observations reveal an intermediate-time multicolor
  10. GRB011121, possible supernova association
  11. XRF/GRB 011030: Detection of the Probable Host Galaxy
  12. GRB020305, optical observations
  13. IPN triangulation of GRB020305 (HETE 1939)
  14. GRB020305 (=H1939): Localization of a GRB by HETE
  15. HST Imaging of the afterglow and host of GRB 011121
  16. IPN detection and localization of Cygnus X-1 flares
  17. RXTE Observations of SGR 1900+14
  18. IPN detection of further SGR1900+14 activity
  19. SGR1900+14 activity
  20. IPN/HETE Detection of Bursts from SGR1900+14
  21. IPN Upper Limits to a GRB Associated With SN2002ap
  22. GRB020127: Palomar and VLA Observations of Possible Counterparts
  23. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  24. SN2002ap (SN/GRB?) Echelle spectra
  25. GRB020127 Optical Observations
  26. SN2002ap (SN/GRB?) UBVRI Field Photometry
  27. GRB020127: Chandra Observations and Prospective Counterparts
  28. GRB020124, optical observations
  29. IPN detection of further activity from SGR1806-20
  30. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  31. GRB020124: Optical observations
  32. IPN observations of SGR1806-20
  33. GRB 020124: Optical afterglow
  34. GRB020124(=H1896): Localization of a Long GRB by HETE
  35. GRB 011211, spectrum and optical photometry
  36. GRB 011211: TNG Spectroscopic Observations
  37. GRB011212 (=H10001): An X-Ray Rich GRB Detected by HETE
  38. GRB011130, optical observations
  39. GRB011130 (=XRF011130): Second Revised Localization by HETE
  40. GRB011130 (XRF011130) optical observations
  41. GRB011130 (=XRF011130): Revised Localization of an X-ray
  42. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE
  43. GRB 011121: J-band observations
  44. GRB011121
  45. GRB011030: Z-band observations
  46. GRB 010921: HST Detection of the Afterglow and Host Galaxy
  47. GRB 970828: HST Observations of the Host Galaxy
  48. GRB 000131: HST Detection of the Host Galaxy
  49. GRB 970828: HST Observations of the Host Galaxy
  50. GRB010921, optical observation
  51. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  52. GRB011019: Subaru Optical Observations
  53. GRB010921, optical observation at early time
  54. GRB 010921, I-band observations
  55. GRB011019: A Faint, X-ray Rich GRB localized by HETE
  56. GRB010921: Spectroscopy of the Host Galaxy
  57. GRB010923 as seen by BeppoSAX GRBM
  58. GRB010928(=H1770): Localization of a Long GRB by HETE
  59. GRB010923(=H1764): A Short Duration GRB Detected by HETE
  60. GRB010921, negative optical observations
  61. GRB010921 Optical Observations
  62. H1761: A Bright GRB Detected by HETE
  63. HETE Trigger #1760 (GRB 010920B?): a new optical source
  64. HETE Trigger #1759 (GRB 010920?) optical observations
  65. GRB 010222: HST observations -- host galaxy and late-time decay
  66. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  67. SGR1900+14 burst seen by HETE: BeppoSAX data
  68. SGR1900+14: High Fluence Burst Localized by HETE
  69. GRB010629: A Burst Localized by HETE
  70. SGR1900+14: Second Burst Localized by HETE
  71. SGR1900+14: A Burst Localized by HETE
  72. Possible burst from SGR1806-20
  73. IPN detection of SGR1900+14
  74. SGR1806-20: A Second, Intense Burst Localized by HETE
  75. SGR1806-20: Localization by HETE
  76. HETE Fully-Automated GCN Notices
  77. GRB000301C: Late-time HST/STIS observation
  78. GRB010518: a faint BeppoSAX detection
  79. GRB000418: HST/STIS Second-epoch Observations
  80. X-ray precursors to the large flare from SGR 1900+14
  81. GRB010427, Gamma Ray Observations
  82. SGR 1900+14 : RXTE observations
  83. Chandra Observations of SGR 1900+14
  84. Possible precursor to the SGR1900+14 giant burst
  85. SGR1900+14, I-band observations
  86. IPN Triangulation of the Giant Flare from SGR1900+14
  87. Giant flare from SGR1900+14
  88. GRB010412: BeppoSAX GRBM and WFC observations
  89. BeppoSAX GRB: extension of BSAX operations upto April 30, 2002
  90. REVISED LOCATION OF GRB010326A
  91. GRB 980326: Late-time HST/STIS observations
  92. GRB010324, field photometry
  93. GRB010326B, field photometry
  94. GRB010326, field photometry
  95. Further Optical Observations of GRB 010324
  96. GRB010324: BeppoSAX/GRBM data
  97. GRB010324, optical observations
  98. GRB010326B: Localization by HETE (2nd GRB for this date)
  99. GRB010326: Refined Localization by HETE
  100. GRB010326: Localization by HETE

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