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"

45892 results found.

  1. IBAS GRB Alerts 1781-4
  2. GRB 040511: Optical observations
  3. GRB 040511: Optical Observations
  4. GRB040511: Optical Observations
  5. GRB040511: Optical Observations
  6. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  7. IBAS GRB Alert number 1774: NOT a real GRB
  8. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  9. IBAS Alerts 1771 and 1772: NOT a real GRB
  10. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  11. IPN triangulation of GRB040425 (=H3183)
  12. On Line Availability of Archival HETE Fregate Data and Lightcurves
  13. GRB040422: optical observations at Xinglong Observatory
  14. GRB040422: optical observations at CrAO
  15. GRB 040423 (=H3175): A Long GRB Localized by HETE
  16. GRB040422, optical observations at Loiano
  17. GRB040422 : I-band follow-up observation at Lulin Observatory
  18. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  19. GRB040422, BVRcIc field calibration
  20. GRB 040422,optical observation
  21. GRB040422: optical and NIR observations at the VLT
  22. GRB 040422: a long GRB detected with INTEGRAL
  23. GRB 040403, deep optical observations
  24. MASTER: HETE Alert 3163, 3167 technical optical observation
  25. INTEGRAL-SPI/ACS GRB data: timing correction
  26. IBAS GRB alerts 1739, 1740, 1741
  27. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  28. GRB 040403: Optical Observations
  29. GRB 040403 Optical Observations
  30. GRB 040403: Optical observations
  31. GRB 040403: optical observations
  32. GRB 040403: Optical Observations
  33. GRB 040403: a long GRB detected with INTEGRAL
  34. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  35. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  36. IBAS GRB Alert 1694
  37. GRB040323: NIR Observations and Variable Object
  38. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  39. GRB 040323, a dark GRB ?
  40. short hard GRB 040322
  41. GRB 040323: a long GRB detected with INTEGRAL
  42. IBAS GRB alerts 1679, 1680, 1681
  43. GRB040223: Deep NIR NTT data re-analysis
  44. GRB 040223: XMM-Newton results
  45. GRB040223, improved XMM position
  46. IBAS Alert 1678: not a GRB
  47. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  48. GRB 031203, possible supernova
  49. MASTER: RXTE GRB040308 optical observation
  50. IBAS results on a burst from SGR1806-20
  51. INTEGRAL detection of activity from SGR1806-20
  52. RXTE GRB040229 optical observation: no candidate
  53. GRB 040228 Optical observations
  54. IPN triangulation of GRB040228 (H3066, H3067)
  55. GRB040228 : KISO optical follow-up observation
  56. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  57. GRB 040223: Deep NIR NTT observations
  58. GRB 040223 : Optical observation (non-detection)
  59. XMM-Newton Images of GRB 040223
  60. GRB 040223, VLA observations
  61. GRB 040223: REM IJK Observations
  62. GRB 040223 XMM-Newton observation ...
  63. GRB 031203 XMM-Newton observation
  64. GRB 040223 : Planned XMM-Newton observation
  65. GRB 040106 : Planned XMM-Newton observation
  66. GRB 040223: further offline analysis
  67. GRB 040223: a long GRB detected with INTEGRAL
  68. GRB031111, optical observations
  69. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  70. GRB031203: Chandra Observations
  71. GRB040106, follow-up radio observations
  72. GRB040106: refined X-ray transient position
  73. Follow-up on IBAS GRB Alert 1379
  74. IBAS GRB alert 1379
  75. SN 2003dh/GRB030329 late-time optical spectroscopy
  76. GRB040106, Radio Observations
  77. GRB040106, likely optical afterglow
  78. GRB040106: Second Epoch Optical Observations
  79. GRB 031220: Optical observations of Chandra X-ray sources
  80. XMM-Newton Images of GRB 040106
  81. GRB040106: optical observations with REM+ROSS
  82. GRB031220: observation at Univercity of Miyazaki
  83. GRB 040106: Optical observations
  84. XMM-Newton observation of GRB040106
  85. GRB 040106 : Planned XMM-Newton observation
  86. GRB 040106 : peak flux
  87. GRB 040106 : a long GRB detected with INTEGRAL
  88. IPN triangulation of an intermediate burst from SGR1806-20
  89. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  90. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  91. GRB031225a triangulation (annulus)
  92. IPN triangulation of GRB031219 (large error box)
  93. GRB031220: Palomar Observations
  94. GRB 031220 : Kyoto Optical Observation
  95. GRB 031220: Subaru observation
  96. GRB 031220: Optical observation at Tokyo Tech
  97. GRB031220: ROTSE-IIIb Optical Limits
  98. GRB031220 : Optical Observation of Lulin Observatory
  99. GRB 031203 I-band monitoring
  100. IPN triangulation of GRB031214 (short/hard; very intense; small 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