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"

45666 results found.

  1. GRB021004: continued fading
  2. GRB 021004: Optical Photometry at 1.5 Days
  3. GRB021004, Optical Observations
  4. GRB021004, BVRcIc field photometry
  5. GRB 021004: Optical observations
  6. GRB 021004: optical counterpart
  7. GRB 021004, optical observations
  8. GRB021004: Optical Spectroscopy
  9. GRB 021004: Optical Observations
  10. GRB 021004, SPM optical observations
  11. GRB 021004, optical observations
  12. GRB 021004 radio search
  13. GRB 021004: radio observations
  14. GRB 021004: steepening of the optical decay slope
  15. GRB021004: Upper limits from recent and historical observations
  16. XRF020903, BVRI field photometry
  17. GRB021004: optical observations at Nyrola
  18. GRB021004: Absorption redshift
  19. GRB021004(=H2380): Revised Localization with HETE Soft X-ray
  20. GRB021004: optical observations at Bisei
  21. GRB 021004: Kyoto observation
  22. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  23. GRB021004: Optical Afterglow
  24. XRF020903: TNG and Asiago photometry
  25. GRB 020903: Optical observations at RIKEN
  26. XRF 020903: Correction to GCN 1560
  27. XRF 020903: VRI observations
  28. IPN triangulation of GRB020926 (single large error box)
  29. GRB 020903: correction to GCN 1557
  30. XRF 020903: R band observations
  31. XRF 020903: Archival Optical Images
  32. Radio Observations of XRF 020903: The Missing Link
  33. XRF 020903: Supernova
  34. IPN triangulation of GRB020926 (two large error boxes)
  35. GRB020924 (ecliptic latitude-only localization)
  36. IPN triangulation of GRB020923 (two error boxes)
  37. IPN annulus for GRB020923
  38. IPN triangulation of GRB020914B
  39. Improved IPN position for GRB020918 (two large error boxes)
  40. IPN annulus for GRB020914B
  41. IPN triangulation of GRB020918 (annulus)
  42. IPN triangulation of GRB020911 (2 large error boxes)
  43. IPN triangulation of GRB020914 - clarification and additional information
  44. IPN triangulation of GRB020914
  45. GRB 020305: HST/STIS observations
  46. Confirmation of IPN error box for GRB020910
  47. IPN triangulation of GRB020910
  48. IPN GCN Circulars now to be issued without restriction
  49. Single IPN error box for GRB020904
  50. XRF 020903: optical observation at Kyoto
  51. GRB020322 : HST/STIS observations
  52. XRF 020903: Optical observations
  53. IPN triangulation of GRB020904
  54. XRF 020903: Optical observations
  55. IPN detection of a burst from SGR1900+14
  56. XRF 020903, optical observations
  57. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  58. INTEGRAL GRBs added to GCN
  59. GRB020813: optical observation
  60. GRB020812: optical observation
  61. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  62. SGR1900+14 burst localized by HETE
  63. GRB020813: High-resolution optical spectroscopy
  64. GRB020819: optical observations at Bisei
  65. GRB020812: negative optical observations
  66. GRB 020812: optical observation at Kyoto University
  67. Second epoch K band imaging of GRB 020819
  68. GRB020813, Baade 6.5m data now available
  69. GRB 020813 : HST observations
  70. Confirming no variability for GRB02081
  71. GRB020819 : Optical observations at KISO
  72. GRB 020812: early time optical observation at Ouda Station
  73. GRB020813: VRI Decay Slopes
  74. GRB020813: Magellan BVRI Photometry
  75. GRB 020819 : OT candidate - confirmation of non variability
  76. GRB 020819: Optical observations
  77. K band observation of GRB 020819
  78. GRB020819: optical observations
  79. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  80. IPN triangulation of GRB020819 (HETE 2275)
  81. HETE 2275: Optical observations
  82. GRB020813: optical and NIR observations
  83. GRB020813: Fading X-ray Afterglow Observed with Chandra
  84. GRB020813, UBVRI field calibration
  85. GRB 020813: addendum to GCN 1498
  86. GRB020813: optical observations at Bisei
  87. GRB020813: V-band decay slope
  88. GRB020812: NIR observations
  89. Polarimetry of GRB020813: evidence for variability
  90. GRB020813 IRAM millimeter observations
  91. GRB020812: optical observations
  92. GRB020813: High-Resolution Optical Observations
  93. GRB020813(=H2262): Revised Localization with HETE SXC
  94. GRB 020812: optical observation at Bisei
  95. GRB020813: Early Time Magnitude
  96. GRB020813: optical observations; possible host galaxy
  97. GRB 020813, radio detection
  98. GRB 020812 : optical afterglow candidate
  99. GRB020813, optical observations
  100. Millimeter observation of GRB 020813

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