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"

45592 results found.

  1. GRB 021004 - Unusual Radio-to-Submm Spectrum
  2. GRB 021004: optical spectroscopy
  3. IPN triangulation of GRB021007 (annulus)
  4. XRF 020903 spectrum
  5. GRB 021004: HST/STIS spectroscopic observations
  6. GRB021004: optical observations and predicted break time
  7. GRB021004: BVRc photometry
  8. GRB 021004 redshift
  9. GRB021004 radio observation
  10. GRB021004: restart of optical decay
  11. GRB 021004: Optical Decay
  12. GRB 021004 continued IR fading
  13. HETE fluences for GRB021004
  14. GRB 021004, spectroscopic observations
  15. GRB021004: not fading anymore?
  16. GRB 021004: Optical Photometry at 2.5 Days
  17. GRB 021004: polarimetric observations
  18. GRB 021004: V-band Polarimetric Observations
  19. GRB021004: Update Bisei photometric data
  20. GRB 021004: Optical Decay
  21. GRB021004, astrometric position
  22. GRB021004, Optical Observations
  23. IRAM Millimeter detection of GRB 021004
  24. GRB 021004: Optical observations at RIKEN
  25. GRB 021004 radio observation
  26. GRB 021004: Optical Observations
  27. GRB021004: continued fading
  28. GRB 021004: Optical Photometry at 1.5 Days
  29. GRB021004, Optical Observations
  30. GRB021004, BVRcIc field photometry
  31. GRB 021004: Optical observations
  32. GRB 021004: optical counterpart
  33. GRB 021004, optical observations
  34. GRB021004: Optical Spectroscopy
  35. GRB 021004: Optical Observations
  36. GRB 021004, SPM optical observations
  37. GRB 021004, optical observations
  38. GRB 021004 radio search
  39. GRB 021004: radio observations
  40. GRB 021004: steepening of the optical decay slope
  41. GRB021004: Upper limits from recent and historical observations
  42. XRF020903, BVRI field photometry
  43. GRB021004: optical observations at Nyrola
  44. GRB021004: Absorption redshift
  45. GRB021004(=H2380): Revised Localization with HETE Soft X-ray
  46. GRB021004: optical observations at Bisei
  47. GRB 021004: Kyoto observation
  48. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  49. GRB021004: Optical Afterglow
  50. XRF020903: TNG and Asiago photometry
  51. GRB 020903: Optical observations at RIKEN
  52. XRF 020903: Correction to GCN 1560
  53. XRF 020903: VRI observations
  54. IPN triangulation of GRB020926 (single large error box)
  55. GRB 020903: correction to GCN 1557
  56. XRF 020903: R band observations
  57. XRF 020903: Archival Optical Images
  58. Radio Observations of XRF 020903: The Missing Link
  59. XRF 020903: Supernova
  60. IPN triangulation of GRB020926 (two large error boxes)
  61. GRB020924 (ecliptic latitude-only localization)
  62. IPN triangulation of GRB020923 (two error boxes)
  63. IPN annulus for GRB020923
  64. IPN triangulation of GRB020914B
  65. Improved IPN position for GRB020918 (two large error boxes)
  66. IPN annulus for GRB020914B
  67. IPN triangulation of GRB020918 (annulus)
  68. IPN triangulation of GRB020911 (2 large error boxes)
  69. IPN triangulation of GRB020914 - clarification and additional information
  70. IPN triangulation of GRB020914
  71. GRB 020305: HST/STIS observations
  72. Confirmation of IPN error box for GRB020910
  73. IPN triangulation of GRB020910
  74. IPN GCN Circulars now to be issued without restriction
  75. Single IPN error box for GRB020904
  76. XRF 020903: optical observation at Kyoto
  77. GRB020322 : HST/STIS observations
  78. XRF 020903: Optical observations
  79. IPN triangulation of GRB020904
  80. XRF 020903: Optical observations
  81. IPN detection of a burst from SGR1900+14
  82. XRF 020903, optical observations
  83. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  84. INTEGRAL GRBs added to GCN
  85. GRB020813: optical observation
  86. GRB020812: optical observation
  87. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  88. SGR1900+14 burst localized by HETE
  89. GRB020813: High-resolution optical spectroscopy
  90. GRB020819: optical observations at Bisei
  91. GRB020812: negative optical observations
  92. GRB 020812: optical observation at Kyoto University
  93. Second epoch K band imaging of GRB 020819
  94. GRB020813, Baade 6.5m data now available
  95. GRB 020813 : HST observations
  96. Confirming no variability for GRB02081
  97. GRB020819 : Optical observations at KISO
  98. GRB 020812: early time optical observation at Ouda Station
  99. GRB020813: VRI Decay Slopes
  100. GRB020813: Magellan BVRI Photometry

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