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"

36020 results found.

  1. IPN/HETE triangulation of GRB040802 (=H3485)
  2. GRB 040730, infrared observations
  3. GRB 040730: Optical observations
  4. GRB 040730: a long GRB detected with INTEGRAL
  5. Ongoing activity of SGR 1806-20
  6. GRB040624: optical monitoring at TNG
  7. Cancellation of IBAS/INTEGRAL GRB alerts
  8. IBAS Alert 1836: NOT a real GRB
  9. GRB040709 J,H-band observations
  10. GRB 040624: optical observations
  11. GRB 040624: optical observations at TNG and VLT
  12. MASTER: GRB 040624 optical observation after 0,48d
  13. GRB 040624: R-band observations
  14. GRB 040624, optical observations
  15. GRB 040624 - A long GRB detected with INTEGRAL
  16. GRB 030329: Rebrightening of hyperluminal ejecta.
  17. IPN Summary of SGR1806-20 Activity in 2004
  18. GRB040511: Retraction of redshift identification
  19. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  20. GRB 040606: Optical observations
  21. MASTER: HETE Alert 3274 optical observation
  22. Activivty of SGR 1806-20
  23. IPN triangulation of an intense intermediate burst from SGR1806-20
  24. GRB 040511, very fast decay?
  25. GRB 030324: Detection and Color of Host Galaxy
  26. GRB 040511: NIR observations with REM
  27. GRB040511: Redshift identifcation
  28. GRB 040511: Optical limit
  29. IBAS GRB Alerts n.1785 to 1791
  30. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  31. GRB 040511: Second Epoch Optical Observations
  32. IBAS GRB Alerts 1781-4
  33. GRB 040511: Optical observations
  34. GRB 040511: Optical Observations
  35. GRB040511: Optical Observations
  36. GRB040511: Optical Observations
  37. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  38. IBAS GRB Alert number 1774: NOT a real GRB
  39. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  40. IBAS Alerts 1771 and 1772: NOT a real GRB
  41. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  42. IPN triangulation of GRB040425 (=H3183)
  43. GRB040422: optical observations at CrAO
  44. GRB 040423 (=H3175): A Long GRB Localized by HETE
  45. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  46. GRB040422, BVRcIc field calibration
  47. GRB 040422,optical observation
  48. GRB 040422: a long GRB detected with INTEGRAL
  49. GRB 040403, deep optical observations
  50. INTEGRAL-SPI/ACS GRB data: timing correction
  51. IBAS GRB alerts 1739, 1740, 1741
  52. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  53. GRB 040403: Optical Observations
  54. GRB 040403 Optical Observations
  55. GRB 040403: Optical observations
  56. GRB 040403: optical observations
  57. GRB 040403: Optical Observations
  58. GRB 040403: a long GRB detected with INTEGRAL
  59. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  60. IBAS GRB Alert 1694
  61. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  62. GRB 040323, a dark GRB ?
  63. short hard GRB 040322
  64. GRB 040323: a long GRB detected with INTEGRAL
  65. IBAS GRB alerts 1679, 1680, 1681
  66. GRB040223: Deep NIR NTT data re-analysis
  67. GRB 040223: XMM-Newton results
  68. GRB040223, improved XMM position
  69. IBAS Alert 1678: not a GRB
  70. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  71. GRB 031203, possible supernova
  72. GRB 040228 Optical observations
  73. IPN triangulation of GRB040228 (H3066, H3067)
  74. GRB040228 : KISO optical follow-up observation
  75. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  76. GRB 040223: Deep NIR NTT observations
  77. GRB 040223 : Optical observation (non-detection)
  78. XMM-Newton Images of GRB 040223
  79. GRB 040223, VLA observations
  80. GRB 040223: REM IJK Observations
  81. GRB 040223 XMM-Newton observation ...
  82. GRB 031203 XMM-Newton observation
  83. GRB 040223 : Planned XMM-Newton observation
  84. GRB 040106 : Planned XMM-Newton observation
  85. GRB 040223: further offline analysis
  86. GRB 040223: a long GRB detected with INTEGRAL
  87. Follow-up on IBAS GRB Alert 1379
  88. IBAS GRB alert 1379
  89. SN 2003dh/GRB030329 late-time optical spectroscopy
  90. GRB040106, likely optical afterglow
  91. GRB040106: Second Epoch Optical Observations
  92. GRB 031220: Optical observations of Chandra X-ray sources
  93. XMM-Newton Images of GRB 040106
  94. GRB040106: optical observations with REM+ROSS
  95. GRB031220: observation at Univercity of Miyazaki
  96. GRB 040106: Optical observations
  97. GRB 040106 : Planned XMM-Newton observation
  98. GRB 040106 : peak flux
  99. GRB 040106 : a long GRB detected with INTEGRAL
  100. IPN triangulation of an intermediate burst from SGR1806-20

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