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"
  1. IPN triangulation of GRB020904
  2. XRF 020903: Optical observations
  3. IPN detection of a burst from SGR1900+14
  4. XRF 020903, optical observations
  5. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  6. INTEGRAL GRBs added to GCN
  7. GRB020813: optical observation
  8. GRB020812: optical observation
  9. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  10. SGR1900+14 burst localized by HETE
  11. GRB020813: High-resolution optical spectroscopy
  12. GRB020819: optical observations at Bisei
  13. GRB020812: negative optical observations
  14. GRB 020812: optical observation at Kyoto University
  15. Second epoch K band imaging of GRB 020819
  16. GRB020813, Baade 6.5m data now available
  17. GRB 020813 : HST observations
  18. Confirming no variability for GRB02081
  19. GRB020819 : Optical observations at KISO
  20. GRB 020812: early time optical observation at Ouda Station
  21. GRB020813: VRI Decay Slopes
  22. GRB020813: Magellan BVRI Photometry
  23. GRB 020819 : OT candidate - confirmation of non variability
  24. GRB 020819: Optical observations
  25. K band observation of GRB 020819
  26. GRB020819: optical observations
  27. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  28. IPN triangulation of GRB020819 (HETE 2275)
  29. HETE 2275: Optical observations
  30. GRB020813: optical and NIR observations
  31. GRB020813: Fading X-ray Afterglow Observed with Chandra
  32. GRB020813, UBVRI field calibration
  33. GRB 020813: addendum to GCN 1498
  34. GRB020813: optical observations at Bisei
  35. GRB020813: V-band decay slope
  36. GRB020812: NIR observations
  37. Polarimetry of GRB020813: evidence for variability
  38. GRB020813 IRAM millimeter observations
  39. GRB020812: optical observations
  40. GRB020813: High-Resolution Optical Observations
  41. GRB020813(=H2262): Revised Localization with HETE SXC
  42. GRB 020812: optical observation at Bisei
  43. GRB020813: Early Time Magnitude
  44. GRB020813: optical observations; possible host galaxy
  45. GRB 020813, radio detection
  46. GRB 020812 : optical afterglow candidate
  47. GRB020813, optical observations
  48. Millimeter observation of GRB 020813
  49. GRB020812: optical observations
  50. GRB 020813 : KISO multiband optical observations
  51. GRB020813, optical observations
  52. IPN error box for GRB020813
  53. IPN triangulation of GRB020813
  54. GRB020812: possible afterglow candidate
  55. Early Time Limits for GRB020813
  56. GRB020812: possible afterglow candidate
  57. GRB020813, astrometric position
  58. Spectropolarimetry of GRB 020813
  59. GRB 020813 Afterglow Observations; Possible break
  60. GRB 020813: Absorption redshift
  61. GRB 020813 multiband optical observations
  62. GRB020813: optical afterglow
  63. GRB020813: Fading of Candidate OT
  64. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  65. GRB020813: Candidate Optical Afterglow
  66. GRB 020812 optical observation
  67. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  68. GRB 020715, optical observations
  69. GRB 020714, optical observations
  70. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  71. GRB020801: Candidate OT present in DSS
  72. HST Imaging of the Host of GRB 011121
  73. GRB020801, optical afterglow candidate
  74. Further refinement to IPN error box for GRB020531
  75. GRB020331: Late-time Optical Light Curve (re-submission)
  76. GRB020331: Late-time Optical Light Curve
  77. GRB 020405: HST observations reveal red bump
  78. IPN triangulation of GRB020714
  79. IPN triangulation of GRB020715 (=GRB150702)
  80. IPN triangulation of GRB020714
  81. IPN triangulation of GRB150702
  82. GRB 020410: Discovery of Probable OT by HST
  83. GRB 020124, HST observations of the fading afterglow
  84. IPN triangulation of GRB020708
  85. IPN triangulation of GRB020708
  86. IPN error box for GRB020706
  87. Correction to IPN error box for GRB020706
  88. IPN triangulation of GRB020706
  89. GRB 020705: Optical observations
  90. GRB 020625, optical observations
  91. GRB 020625: Optical observations
  92. GRB 020531: optical photometry of Chandra sources
  93. GRB020625 (=H2081): A Long Burst Localized by HETE
  94. HETE #2081: Optical observations
  95. The Probable Host Galaxy of GRB/XRF 020427
  96. GRB/XRF 020427, detection of an underlying system with the VLT
  97. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  98. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  99. AXP 1E2259+586: quasi-simultaneous optical observation
  100. AXP 1E2259+586 optical 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