Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

35441 results found.

  1. GRB 021004: steepening of the optical decay slope
  2. GRB021004: Upper limits from recent and historical observations
  3. XRF020903, BVRI field photometry
  4. GRB021004: optical observations at Nyrola
  5. GRB021004: Absorption redshift
  6. GRB 021004: Kyoto observation
  7. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  8. GRB021004: Optical Afterglow
  9. GRB 020903: Optical observations at RIKEN
  10. IPN triangulation of GRB020926 (single large error box)
  11. GRB 020903: correction to GCN 1557
  12. XRF 020903: R band observations
  13. Radio Observations of XRF 020903: The Missing Link
  14. IPN triangulation of GRB020926 (two large error boxes)
  15. GRB020924 (ecliptic latitude-only localization)
  16. IPN triangulation of GRB020923 (two error boxes)
  17. IPN annulus for GRB020923
  18. IPN triangulation of GRB020914B
  19. Improved IPN position for GRB020918 (two large error boxes)
  20. IPN annulus for GRB020914B
  21. IPN triangulation of GRB020918 (annulus)
  22. IPN triangulation of GRB020911 (2 large error boxes)
  23. IPN triangulation of GRB020914 - clarification and additional information
  24. IPN triangulation of GRB020914
  25. GRB 020305: HST/STIS observations
  26. Confirmation of IPN error box for GRB020910
  27. IPN triangulation of GRB020910
  28. IPN GCN Circulars now to be issued without restriction
  29. Single IPN error box for GRB020904
  30. XRF 020903: optical observation at Kyoto
  31. GRB020322 : HST/STIS observations
  32. IPN triangulation of GRB020904
  33. IPN detection of a burst from SGR1900+14
  34. INTEGRAL GRBs added to GCN
  35. GRB020813: High-resolution optical spectroscopy
  36. GRB 020812: optical observation at Kyoto University
  37. Second epoch K band imaging of GRB 020819
  38. GRB020813, Baade 6.5m data now available
  39. GRB 020813 : HST observations
  40. Confirming no variability for GRB02081
  41. GRB020819 : Optical observations at KISO
  42. GRB 020812: early time optical observation at Ouda Station
  43. GRB020813: VRI Decay Slopes
  44. GRB 020819 : OT candidate - confirmation of non variability
  45. GRB 020819: Optical observations
  46. K band observation of GRB 020819
  47. GRB020819: optical observations
  48. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  49. IPN triangulation of GRB020819 (HETE 2275)
  50. GRB020813, UBVRI field calibration
  51. GRB 020813: addendum to GCN 1498
  52. GRB020813: optical observations at Bisei
  53. GRB020813: V-band decay slope
  54. Polarimetry of GRB020813: evidence for variability
  55. GRB020813 IRAM millimeter observations
  56. GRB020812: optical observations
  57. GRB 020812: optical observation at Bisei
  58. GRB020813: optical observations; possible host galaxy
  59. GRB 020813, radio detection
  60. GRB 020812 : optical afterglow candidate
  61. Millimeter observation of GRB 020813
  62. GRB020812: optical observations
  63. GRB 020813 : KISO multiband optical observations
  64. IPN error box for GRB020813
  65. IPN triangulation of GRB020813
  66. GRB020812: possible afterglow candidate
  67. Early Time Limits for GRB020813
  68. GRB020812: possible afterglow candidate
  69. GRB020813, astrometric position
  70. Spectropolarimetry of GRB 020813
  71. GRB 020813 Afterglow Observations; Possible break
  72. GRB 020813: Absorption redshift
  73. GRB 020813 multiband optical observations
  74. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  75. GRB 020812 optical observation
  76. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  77. GRB 020715, optical observations
  78. GRB 020714, optical observations
  79. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  80. HST Imaging of the Host of GRB 011121
  81. GRB020801, optical afterglow candidate
  82. Further refinement to IPN error box for GRB020531
  83. GRB020331: Late-time Optical Light Curve (re-submission)
  84. GRB020331: Late-time Optical Light Curve
  85. GRB 020405: HST observations reveal red bump
  86. IPN triangulation of GRB020714
  87. IPN triangulation of GRB020715 (=GRB150702)
  88. IPN triangulation of GRB020714
  89. IPN triangulation of GRB150702
  90. GRB 020410: Discovery of Probable OT by HST
  91. GRB 020124, HST observations of the fading afterglow
  92. IPN triangulation of GRB020708
  93. IPN triangulation of GRB020708
  94. IPN error box for GRB020706
  95. IPN triangulation of GRB020706
  96. GRB 020705: Optical observations
  97. GRB 020625, optical observations
  98. GRB 020625: Optical observations
  99. GRB 020531: optical photometry of Chandra sources
  100. GRB020625 (=H2081): A Long Burst Localized by HETE

Advanced

Download all Circulars as a .tar.gz archive:
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