Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! 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"

26312 results found.

  1. XRF 020903: Supernova
  2. IPN triangulation of GRB020926 (two large error boxes)
  3. GRB020924 (ecliptic latitude-only localization)
  4. IPN triangulation of GRB020923 (two error boxes)
  5. IPN annulus for GRB020923
  6. IPN triangulation of GRB020914B
  7. IPN triangulation of GRB020918 (annulus)
  8. IPN triangulation of GRB020911 (2 large error boxes)
  9. IPN triangulation of GRB020914 - clarification and additional information
  10. IPN triangulation of GRB020910
  11. IPN GCN Circulars now to be issued without restriction
  12. GRB020322 : HST/STIS observations
  13. XRF 020903: Optical observations
  14. IPN triangulation of GRB020904
  15. IPN detection of a burst from SGR1900+14
  16. XRF 020903, optical observations
  17. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  18. GRB020813: optical observation
  19. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  20. SGR1900+14 burst localized by HETE
  21. GRB020819: optical observations at Bisei
  22. GRB020812: negative optical observations
  23. GRB 020812: optical observation at Kyoto University
  24. Second epoch K band imaging of GRB 020819
  25. GRB020813, Baade 6.5m data now available
  26. GRB 020813 : HST observations
  27. Confirming no variability for GRB02081
  28. GRB020819 : Optical observations at KISO
  29. GRB 020812: early time optical observation at Ouda Station
  30. GRB020813: VRI Decay Slopes
  31. GRB020813: Magellan BVRI Photometry
  32. GRB 020819 : OT candidate - confirmation of non variability
  33. GRB020819: optical observations
  34. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  35. IPN triangulation of GRB020819 (HETE 2275)
  36. GRB020813: Fading X-ray Afterglow Observed with Chandra
  37. GRB 020813: addendum to GCN 1498
  38. GRB020813: V-band decay slope
  39. GRB020812: NIR observations
  40. Polarimetry of GRB020813: evidence for variability
  41. GRB020813 IRAM millimeter observations
  42. GRB020813: High-Resolution Optical Observations
  43. GRB 020812: optical observation at Bisei
  44. GRB020813: Early Time Magnitude
  45. GRB020813: optical observations; possible host galaxy
  46. GRB 020813, radio detection
  47. GRB 020812 : optical afterglow candidate
  48. GRB020813, optical observations
  49. Millimeter observation of GRB 020813
  50. GRB020812: optical observations
  51. GRB020813, optical observations
  52. IPN error box for GRB020813
  53. IPN triangulation of GRB020813
  54. Early Time Limits for GRB020813
  55. GRB020813, astrometric position
  56. GRB 020813 Afterglow Observations; Possible break
  57. GRB 020813 multiband optical observations
  58. GRB020813: optical afterglow
  59. GRB020813: Fading of Candidate OT
  60. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  61. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  62. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  63. GRB020801: Candidate OT present in DSS
  64. GRB020331: Late-time Optical Light Curve (re-submission)
  65. GRB020331: Late-time Optical Light Curve
  66. GRB 020405: HST observations reveal red bump
  67. IPN triangulation of GRB020715 (=GRB150702)
  68. IPN triangulation of GRB020714
  69. IPN triangulation of GRB150702
  70. GRB 020410: Discovery of Probable OT by HST
  71. IPN triangulation of GRB020708
  72. IPN triangulation of GRB020708
  73. IPN triangulation of GRB020706
  74. GRB 020625, optical observations
  75. GRB 020531: optical photometry of Chandra sources
  76. GRB020625 (=H2081): A Long Burst Localized by HETE
  77. The Probable Host Galaxy of GRB/XRF 020427
  78. GRB/XRF 020427, detection of an underlying system with the VLT
  79. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  80. AXP 1E2259+586: quasi-simultaneous optical observation
  81. AXP 1E2259+586 optical observations
  82. Fading Optical Source in the Field of GRB020531
  83. GRB 020531, INT+WFC deep optical upper limits
  84. GRB 020531, simultaneous optical observations
  85. GRB020531: Second epoch Chandra observations
  86. GRB020531 Optical observations with TAROT
  87. GRB020531 Optical observations with TAROT
  88. GRB 020531, Radio Observations
  89. IPN triangulation of GRB020604
  90. GRB020531: Observations with the Chandra X-ray Observatory
  91. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  92. GRB020531: Upper Limit for Detection of Two TAROT Sources
  93. IPN triangulation of GRB020603 (possible short/hard GRB)
  94. IPN triangulation of the short, hard GRB020531 (=H2042)
  95. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  96. IPN detection of possible bursts from SGR1806-20
  97. IPN triangulation of GRB020525
  98. XRF 020427: Sudden Ionospheric Disturbance (SID)
  99. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  100. GRB/XRF 020427, Radio Observations

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