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"

28116 results found.

  1. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  2. GRB031203: Chandra Observations
  3. GRB040106: refined X-ray transient position
  4. SN 2003dh/GRB030329 late-time optical spectroscopy
  5. GRB 031220: Optical observations of Chandra X-ray sources
  6. XMM-Newton Images of GRB 040106
  7. GRB031220: observation at Univercity of Miyazaki
  8. XMM-Newton observation of GRB040106
  9. GRB 040106 : peak flux
  10. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  11. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  12. GRB031220: Palomar Observations
  13. GRB 031220 : Kyoto Optical Observation
  14. GRB 031220: Subaru observation
  15. GRB 031220: Optical observation at Tokyo Tech
  16. GRB 2974 follow-up observations
  17. GRB031203, improved XMM position
  18. GRB 021203: A Normal GRB viewed far off axis?
  19. XMM-Newton Observations of GRB031203: Preliminary Images
  20. GRB 031203: Variable Radio Source
  21. GRB 031203: Magellan spectrum of possible GRB host
  22. GRB 031203: Optical/IR Astrometry
  23. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  24. XMM-Newton Observation of GRB031203
  25. GRB031203: K' Photometry of the likely GRB host
  26. XMM-Newton Observation of GRB031203
  27. GRB 031203: IR NTTobservations do not confirm REM detection
  28. GRB031203 : Optical Observation of Lulin Observatory
  29. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  30. GRB 031203: Apparent Spectral Break
  31. GRB031203: Planned XMM-Newton observation II
  32. GRB 031203: IR REM Observations
  33. GRB031203: Optical Observations
  34. GRB 031203 XMM-Newton observation
  35. GRB031203: Planned XMM-Newton observation
  36. GRB 031203: further analysis of INTEGRAL data
  37. GRB 030329: Planned XMM-Newton Observation
  38. GRB 031111B (= H2925) : Kyoto Optical Observation
  39. IPN triangulation of GRB031114 (large error box)
  40. GRB 031111, optical observations
  41. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  42. GRB030929/SN2003jd association unlikely based on IPN localiztion
  43. IPN triangulation of GRB031027 (small error box)
  44. Lulin optical follow-up observations of GRB031026
  45. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  46. IPN triangulation of GRB031024 (single error box)
  47. IPN triangulation of GRB031024 (annulus)
  48. IPN triangulation of GRB031020 (large error box)
  49. XRF 030824: additional observations at CFHT
  50. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  51. XRF 030723: Subaru Optical Observations
  52. XRF 030824: Early follow-up observation at Kiso observatory
  53. XRF 030824: observations at CFHT
  54. IPN triangulation of GRB030922B (large error box)
  55. XRF 030723: Detection of the likely host galaxy
  56. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  57. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  58. IPN triangulation of GRB030921 (large error box)
  59. IPN triangulation of GRB030919 (large error box)
  60. GRB030913: Subaru Optical Observations
  61. GRB 030913, optical candidate
  62. GRB 030913, BOOTES observations
  63. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  64. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  65. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  66. XRF030824: Optical observations
  67. IPN triangulation of GRB030903 (large error box)
  68. IPN triangulation of GRB030827 (large error box)
  69. GRB030823: optical observations
  70. GRB030823: optical observation at Tokyo Tech
  71. Lulin follow-up observations of GRB030823
  72. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  73. IPN detection of continued activity from SGR1806-20
  74. GRB 030817 = H2808 TAROT optical observations
  75. SGR 1808-20 (=H2802): A Possible new SGR
  76. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  77. XRF 030723: Detection of a rebrightening in the optical afterglow
  78. XRF030723, BVRcIc field photometry update
  79. IPN triangulation of GRB030801 (large error box)
  80. GRB021206 optical counterpart upper limit
  81. IPN triangulation of GRB030726 (large error box)
  82. IPN triangulation of GRB030721 (large error box)
  83. XRF030723 Radio Observations
  84. XRF 030723: confirmation of fading optical counterpart
  85. XRF030723(=H2777): Chandra Observations
  86. GRB030723: Upper limits from historical observations
  87. XRF030723: Palomar observations and proposed counterpart
  88. GRB030725 (=H2779): A Bright GRB Localized by HETE
  89. XRF030723 (= H2777): Chandra Observations Scheduled
  90. XRF030723, BVRcIc field photometry correction
  91. XRF030723, ROTSE-III Early Observations
  92. XRF030723, BVRcIc field photometry
  93. XRF 030723, optical observations
  94. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  95. Konus-Wind detection of the bursts from SGR1806-20 region
  96. SGR 1806-20, submm observations
  97. RXTE PCA Observations of SGR1806-20 Region
  98. IPN triangulation of GRB030714 (two large error boxes)
  99. IPN triangulation of GRB030715 (two large error boxes)
  100. GRB030706 triangulation (single 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