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"

11755 results found.

  1. GRB041015: MASTER: Optical observations
  2. GRB041006: Fading X-ray Afterglow Observed with Chandra
  3. GRB 041015: Optical limit at Osaka University
  4. GRB 041015 - A long GRB detected by INTEGRAL
  5. GRB041006, optical observation in CrAO
  6. Search for SN light in XRF 040912 with MEGACAM
  7. GRB 041006 : optical follow-up observation at Lulin Observatory
  8. ROTSE-IIIa Observations of GRB 041006
  9. GRB 041006: Optical decay
  10. Konus-Wind observation of a series SGR 1806-20 bursts on 041005
  11. Bursts from SGR 1806-20: Preliminary INTEGRAL results
  12. Very strong outburst from SGR 1806-20 detected with INTEGRAL
  13. SGR 1806-20 still active
  14. Konus-Wind and Helicon-Coronas-F observations of GRB040924
  15. GRB040924,optical observation
  16. GRB040924, RTT150 optical observation
  17. GRB040924 : Optical candidate observations at Lulin observatory
  18. GRB 040924: RTT150 optical observations
  19. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  20. XRF040916: continuing decay of OT
  21. GRB040912(=H3557): Candidate Optical Afterglow
  22. GRB040916 optical limits 17 min after GRB
  23. XRF 040912, identification of CXO sources
  24. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  25. ROTSE-IIIb Observations of GRB 040916 (HETE #3558)
  26. GRB 040912: Optical Observations
  27. An intense burst from SGR1806-20
  28. GRB040912 : Kiso Optical follow-up observation
  29. HETE 3557: Optical observations
  30. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  31. GRB040903 - A XRF?
  32. GRB040827: analysis of the XMM-Newton observation
  33. Very bright burst detected from SGR 1806-20
  34. Possible GRB 040903 - further analysis
  35. GRB 040827 : peak flux
  36. Increase of SGR 1806-20 activity
  37. GRB 040812: Optical counterparts of CXO sources
  38. Bursting activity from SGR 1806-20 detected with IBAS
  39. Konus-Wind observation of GRB040810 (=H3489)
  40. GRB 040812: a long GRB detected by INTEGRAL
  41. GRB 040730: Optical observations
  42. GRB 040730: a long GRB detected with INTEGRAL
  43. Ongoing activity of SGR 1806-20
  44. XRF 040701 - optical observations of the decaying Chandra source
  45. XRF040701: Second-Epoch Chandra Observations
  46. Cancellation of IBAS/INTEGRAL GRB alerts
  47. XRF040701: VLA Observations
  48. XRF040701: First-Epoch Chandra Observations
  49. GRB040709 J,H-band observations
  50. GRB 040624: optical observations
  51. GRB 040624: R-band observations
  52. GRB 040624 - A long GRB detected with INTEGRAL
  53. IPN Summary of SGR1806-20 Activity in 2004
  54. SGR 1806-20: no IR variability of the proposed counterparts
  55. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  56. SGR 1806-20, potential NIR counterpart
  57. MASTER: HETE Alert 3274 optical observation
  58. Activivty of SGR 1806-20
  59. IPN triangulation of an intense intermediate burst from SGR1806-20
  60. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  61. GRB 040511: Second Epoch Optical Observations
  62. GRB 040511: Optical Observations
  63. GRB040511: Optical Observations
  64. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  65. IPN triangulation of GRB040425 (=H3183)
  66. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  67. GRB 040422: a long GRB detected with INTEGRAL
  68. GRB 040403, deep optical observations
  69. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  70. GRB 040403: Optical observations
  71. GRB 040403: a long GRB detected with INTEGRAL
  72. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  73. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  74. GRB040323: NIR Observations and Variable Object
  75. GRB 040323: a long GRB detected with INTEGRAL
  76. GRB040223: Deep NIR NTT data re-analysis
  77. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  78. MASTER: RXTE GRB040308 optical observation
  79. IBAS results on a burst from SGR1806-20
  80. INTEGRAL detection of activity from SGR1806-20
  81. IPN triangulation of GRB040228 (H3066, H3067)
  82. GRB 040223: further offline analysis
  83. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  84. GRB040106, likely optical afterglow
  85. GRB031220: observation at Univercity of Miyazaki
  86. GRB 040106 : peak flux
  87. IPN triangulation of an intermediate burst from SGR1806-20
  88. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  89. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  90. GRB031220: Palomar Observations
  91. GRB 031220: Subaru observation
  92. GRB 031220: Optical observation at Tokyo Tech
  93. GRB031220: ROTSE-IIIb Optical Limits
  94. GRB031220 : Optical Observation of Lulin Observatory
  95. GRB 2974 follow-up observations
  96. GRB 021203: A Normal GRB viewed far off axis?
  97. GRB 031203: Variable Radio Source
  98. GRB 031203: Optical/IR Astrometry
  99. GRB 031203: Deep NIR NTT & VLT observations
  100. GRB 031203: Radio detection

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