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"

16099 results found.

  1. GRB 021004: Optical observations
  2. GRB 021004: optical counterpart
  3. GRB 021004, optical observations
  4. GRB021004: Optical Spectroscopy
  5. GRB 021004: Optical Observations
  6. GRB 021004, SPM optical observations
  7. GRB 021004, optical observations
  8. GRB 021004: radio observations
  9. GRB 021004: steepening of the optical decay slope
  10. GRB021004: Upper limits from recent and historical observations
  11. GRB021004: optical observations at Nyrola
  12. GRB021004: Absorption redshift
  13. GRB021004(=H2380): Revised Localization with HETE Soft X-ray
  14. GRB021004: optical observations at Bisei
  15. GRB 021004: Kyoto observation
  16. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  17. GRB021004: Optical Afterglow
  18. GRB 020903: Optical observations at RIKEN
  19. XRF 020903: Archival Optical Images
  20. Radio Observations of XRF 020903: The Missing Link
  21. XRF 020903: Supernova
  22. GRB 020305: HST/STIS observations
  23. XRF 020903: optical observation at Kyoto
  24. GRB020322 : HST/STIS observations
  25. XRF 020903: Optical observations
  26. XRF 020903: Optical observations
  27. XRF 020903, optical observations
  28. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  29. GRB020813: optical observation
  30. GRB020812: optical observation
  31. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  32. SGR1900+14 burst localized by HETE
  33. GRB020813: High-resolution optical spectroscopy
  34. GRB020819: optical observations at Bisei
  35. GRB020812: negative optical observations
  36. GRB 020812: optical observation at Kyoto University
  37. GRB 020813 : HST observations
  38. GRB020819 : Optical observations at KISO
  39. GRB 020812: early time optical observation at Ouda Station
  40. GRB 020819: Optical observations
  41. GRB020819: optical observations
  42. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  43. HETE 2275: Optical observations
  44. GRB020813: optical and NIR observations
  45. GRB020813: Fading X-ray Afterglow Observed with Chandra
  46. GRB020813, UBVRI field calibration
  47. GRB 020813: addendum to GCN 1498
  48. GRB020813: optical observations at Bisei
  49. GRB020813: V-band decay slope
  50. Polarimetry of GRB020813: evidence for variability
  51. GRB020812: optical observations
  52. GRB020813: High-Resolution Optical Observations
  53. GRB020813(=H2262): Revised Localization with HETE SXC
  54. GRB 020812: optical observation at Bisei
  55. GRB020813: optical observations; possible host galaxy
  56. GRB 020813, radio detection
  57. GRB 020812 : optical afterglow candidate
  58. GRB020813, optical observations
  59. GRB020812: optical observations
  60. GRB 020813 : KISO multiband optical observations
  61. GRB020813, optical observations
  62. IPN triangulation of GRB020813
  63. GRB020812: possible afterglow candidate
  64. Early Time Limits for GRB020813
  65. GRB020812: possible afterglow candidate
  66. GRB 020813 multiband optical observations
  67. GRB020813: optical afterglow
  68. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  69. GRB020813: Candidate Optical Afterglow
  70. GRB 020812 optical observation
  71. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  72. GRB 020715, optical observations
  73. GRB 020714, optical observations
  74. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  75. GRB020801, optical afterglow candidate
  76. GRB020331: Late-time Optical Light Curve (re-submission)
  77. GRB020331: Late-time Optical Light Curve
  78. GRB 020410: Discovery of Probable OT by HST
  79. GRB 020124, HST observations of the fading afterglow
  80. GRB 020705: Optical observations
  81. GRB 020625, optical observations
  82. GRB 020625: Optical observations
  83. GRB 020531: optical photometry of Chandra sources
  84. GRB020625 (=H2081): A Long Burst Localized by HETE
  85. HETE #2081: Optical observations
  86. The Probable Host Galaxy of GRB/XRF 020427
  87. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  88. AXP 1E2259+586: quasi-simultaneous optical observation
  89. AXP 1E2259+586 optical observations
  90. Fading Optical Source in the Field of GRB020531
  91. GRB 020531, INT+WFC deep optical upper limits
  92. GRB020405: polarimetric observations
  93. GRB 020531, simultaneous optical observations
  94. GRB 020604, optical observations
  95. GRB020604, optical observations
  96. GRB020531 Optical observations with TAROT
  97. GRB020531 Optical observations with TAROT
  98. GRB 020418, optical/near-IR observations
  99. GRB020531 Optical Observations
  100. GRB020531: Observations with the Chandra X-ray Observatory

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