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"

26338 results found.

  1. GRB 040423 (=H3175): A Long GRB Localized by HETE
  2. GRB040422, optical observations at Loiano
  3. GRB040422 : I-band follow-up observation at Lulin Observatory
  4. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  5. GRB 040422,optical observation
  6. GRB 040403, deep optical observations
  7. INTEGRAL-SPI/ACS GRB data: timing correction
  8. IBAS GRB alerts 1739, 1740, 1741
  9. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  10. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  11. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  12. IBAS GRB Alert 1694
  13. GRB040323: NIR Observations and Variable Object
  14. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  15. GRB 040323, a dark GRB ?
  16. short hard GRB 040322
  17. IBAS GRB alerts 1679, 1680, 1681
  18. GRB040223: Deep NIR NTT data re-analysis
  19. GRB 040223: XMM-Newton results
  20. GRB040223, improved XMM position
  21. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  22. GRB 031203, possible supernova
  23. MASTER: RXTE GRB040308 optical observation
  24. GRB 040228 Optical observations
  25. IPN triangulation of GRB040228 (H3066, H3067)
  26. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  27. GRB031111, optical observations
  28. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  29. GRB031203: Chandra Observations
  30. GRB040106: refined X-ray transient position
  31. IBAS GRB alert 1379
  32. GRB040106, likely optical afterglow
  33. GRB 031220: Optical observations of Chandra X-ray sources
  34. IPN triangulation of an intermediate burst from SGR1806-20
  35. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  36. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  37. GRB031225a triangulation (annulus)
  38. GRB031220: Palomar Observations
  39. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  40. GRB 2974 follow-up observations
  41. GRB031203, improved XMM position
  42. GRB 031203: Discovery of a dust echo
  43. GRB031214 triangulation (annulus), [repost of GCN2487, subject corrected]
  44. GRB030921 triangulation (annulus)
  45. GRB 031203: SMARTS optical monitoring
  46. GRB 031203: Variable Radio Source
  47. IPN/HETE localization of GRB031203B (=H2949; large error box)
  48. XMM-Newton Observation of GRB031203
  49. GRB 031203: Deep NIR NTT & VLT observations
  50. XMM-Newton Observation of GRB031203
  51. GRB 031203: Radio detection
  52. GRB 031203: Further reports on December 4 observations
  53. GRB 031203: IR NTTobservations do not confirm REM detection
  54. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  55. GRB 031203: Apparent Spectral Break
  56. GRB031203: Optical Observations
  57. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  58. IPN/HETE localization of GRB031109 (=H2917; large error box)
  59. IPN detection of activity from SGR1806-20
  60. IPN triangulation of GRB031114 (large error box)
  61. IPN triangulation of GRB031107 (two large error boxes)
  62. HETE Prompt GRB Spectral Analyses
  63. IPN triangulation of GRB031111 (=H2924): small error box
  64. XRF031109 (=H2919): A very long XRF localized by HETE
  65. IPN triangulation of GRB031108 (large error box)
  66. GRB030929/SN2003jd association unlikely based on IPN localiztion
  67. IPN triangulation of GRB031027 (small error box)
  68. IPN triangulation of GRB031026B (large error box)
  69. Lulin optical follow-up observations of GRB031026
  70. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  71. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  72. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  73. IPN triangulation of GRB031024 (annulus)
  74. IPN triangulation of GRB031020 (large error box)
  75. IPN triangulation of GRB031016 (two large error boxes)
  76. IPN triangulation of GRB031014 (annulus)
  77. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  78. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  79. IPN triangulation of GRB031008 (annulus)
  80. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  81. IPN detection of continued activity from SGR1806-20
  82. IPN triangulation of GRB031007 (two large error boxes)
  83. IPN triangulation of GRB031004B (annulus)
  84. IPN triangulation of GRB031004A (short/hard; annulus)
  85. IPN triangulation of GRB030929 (short/hard; annulus)
  86. XRF 030824: Early follow-up observation at Kiso observatory
  87. IPN triangulation of GRB030922B (large error box)
  88. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  89. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  90. IPN triangulation of GRB030922A (large error box)
  91. IPN triangulation of GRB030921 (large error box)
  92. IPN triangulation of GRB030919 (large error box)
  93. GRB030922 triangulation (annulus)
  94. GRB030913: Subaru Optical Observations
  95. GRB 030913: ROTSE-3c Optical Observations
  96. GRB030913: OT's limit by MASTER
  97. GRB030921 triangulation (annulus)
  98. GRB030913: AAVSO optical observations
  99. GRB 030913, BOOTES observations
  100. GRB030913 (=H2849): Confirmation of the Flight Localization

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