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"

42644 results found.

  1. GRB 040403: a long GRB detected with INTEGRAL
  2. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  3. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  4. IBAS GRB Alert 1694
  5. GRB040323: NIR Observations and Variable Object
  6. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  7. GRB 040323, a dark GRB ?
  8. short hard GRB 040322
  9. GRB 040323: a long GRB detected with INTEGRAL
  10. IBAS GRB alerts 1679, 1680, 1681
  11. GRB040223: Deep NIR NTT data re-analysis
  12. GRB 040223: XMM-Newton results
  13. GRB040223, improved XMM position
  14. IBAS Alert 1678: not a GRB
  15. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  16. GRB 031203, possible supernova
  17. MASTER: RXTE GRB040308 optical observation
  18. IBAS results on a burst from SGR1806-20
  19. INTEGRAL detection of activity from SGR1806-20
  20. GRB 040228 Optical observations
  21. IPN triangulation of GRB040228 (H3066, H3067)
  22. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  23. GRB 040223: Deep NIR NTT observations
  24. GRB 040223 : Optical observation (non-detection)
  25. XMM-Newton Images of GRB 040223
  26. GRB 040223, VLA observations
  27. GRB 040223: REM IJK Observations
  28. GRB 040223 XMM-Newton observation ...
  29. GRB 031203 XMM-Newton observation
  30. GRB 040223: further offline analysis
  31. GRB 040223: a long GRB detected with INTEGRAL
  32. GRB031111, optical observations
  33. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  34. GRB031203: Chandra Observations
  35. GRB040106, follow-up radio observations
  36. GRB040106: refined X-ray transient position
  37. IBAS GRB alert 1379
  38. SN 2003dh/GRB030329 late-time optical spectroscopy
  39. GRB040106, Radio Observations
  40. GRB040106, likely optical afterglow
  41. GRB040106: Second Epoch Optical Observations
  42. GRB 031220: Optical observations of Chandra X-ray sources
  43. GRB040106: optical observations with REM+ROSS
  44. GRB031220: observation at Univercity of Miyazaki
  45. GRB 040106: Optical observations
  46. XMM-Newton observation of GRB040106
  47. GRB 040106 : peak flux
  48. GRB 040106 : a long GRB detected with INTEGRAL
  49. IPN triangulation of an intermediate burst from SGR1806-20
  50. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  51. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  52. GRB031225a triangulation (annulus)
  53. IPN triangulation of GRB031219 (large error box)
  54. GRB031220: Palomar Observations
  55. GRB 031220 : Kyoto Optical Observation
  56. GRB 031220: Optical observation at Tokyo Tech
  57. GRB 031203 I-band monitoring
  58. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  59. GRB 2974 follow-up observations
  60. GRB031203, improved XMM position
  61. GRB 031203: Discovery of a dust echo
  62. GRB031214 triangulation (annulus), [repost of GCN2487, subject corrected]
  63. GRB030921 triangulation (annulus)
  64. GRB 021203: A Normal GRB viewed far off axis?
  65. GRB 031203: Variable Radio Source
  66. GRB 031203: Magellan spectrum of possible GRB host
  67. GRB 031203: Optical/IR Astrometry
  68. IPN/HETE localization of GRB031203B (=H2949; large error box)
  69. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  70. XMM-Newton Observation of GRB031203
  71. GRB 031203: Deep NIR NTT & VLT observations
  72. GRB031203: K' Photometry of the likely GRB host
  73. XMM-Newton Observation of GRB031203
  74. GRB 031203: Radio detection
  75. GRB 031203: IR NTTobservations do not confirm REM detection
  76. GRB031203 : Optical Observation of Lulin Observatory
  77. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  78. GRB 031203: Apparent Spectral Break
  79. GRB 031203: IR REM Observations
  80. GRB031203: Optical Observations
  81. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  82. GRB 031203: further analysis of INTEGRAL data
  83. GRB 031203: A long GRB detected with INTEGRAL
  84. IPN triangulation of GRB031201 (large error box)
  85. IPN triangulation of GRB031130 (large error box)
  86. GRB 030329: Planned XMM-Newton Observation
  87. IPN triangulation of GRB031120 (two large error boxes)
  88. GRB 031111B (= H2925) : Kyoto Optical Observation
  89. IPN/HETE localization of GRB031109 (=H2917; large error box)
  90. IPN detection of activity from SGR1806-20
  91. GRB 031111, Radio observations
  92. IPN triangulation of GRB031114 (large error box)
  93. IPN triangulation of GRB031107 (two large error boxes)
  94. GRB 031111: Optical observations
  95. GRB 031111, optical observations
  96. SN 2003jd (SN/GRB?) -- X-ray Observations
  97. HETE Prompt GRB Spectral Analyses
  98. IPN triangulation of GRB031111 (=H2924): small error box
  99. XRF031109 (=H2919): A very long XRF localized by HETE
  100. IPN triangulation of GRB031108 (large error box)

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