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"

20361 results found.

  1. GRB021004: optical observation
  2. GRB 021004: Host Galaxy Star Formation Rate
  3. GRB021004: NIR and Optical observations
  4. GRB 021004: Optical measurement at OHP
  5. GRB 021004: optical spectroscopy
  6. IPN triangulation of GRB021007 (annulus)
  7. GRB021004: BVRc photometry
  8. GRB021004 radio observation
  9. GRB 021004: Optical Photometry at 2.5 Days
  10. GRB 021004: polarimetric observations
  11. GRB 021004: V-band Polarimetric Observations
  12. GRB021004: Update Bisei photometric data
  13. GRB 021004 radio observation
  14. GRB 021004: Optical Observations
  15. GRB 021004: Optical Photometry at 1.5 Days
  16. GRB021004, Optical Observations
  17. GRB021004, BVRcIc field photometry
  18. GRB 021004: Optical observations
  19. GRB 021004: optical counterpart
  20. GRB 021004, optical observations
  21. GRB 021004 radio search
  22. GRB 021004: steepening of the optical decay slope
  23. XRF020903, BVRI field photometry
  24. GRB021004: optical observations at Nyrola
  25. GRB021004: optical observations at Bisei
  26. GRB 021004: Kyoto observation
  27. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  28. XRF020903: TNG and Asiago photometry
  29. GRB 020903: Optical observations at RIKEN
  30. XRF 020903: Correction to GCN 1560
  31. XRF 020903: VRI observations
  32. GRB 020903: correction to GCN 1557
  33. XRF 020903: R band observations
  34. XRF 020903: Supernova
  35. IPN triangulation of GRB020923 (two error boxes)
  36. GRB 020305: HST/STIS observations
  37. Confirmation of IPN error box for GRB020910
  38. IPN triangulation of GRB020910
  39. Single IPN error box for GRB020904
  40. XRF 020903: optical observation at Kyoto
  41. GRB020322 : HST/STIS observations
  42. XRF 020903: Optical observations
  43. IPN triangulation of GRB020904
  44. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  45. INTEGRAL GRBs added to GCN
  46. SGR1900+14 burst localized by HETE
  47. GRB020813: High-resolution optical spectroscopy
  48. GRB020812: negative optical observations
  49. GRB 020812: optical observation at Kyoto University
  50. Second epoch K band imaging of GRB 020819
  51. GRB 020813 : HST observations
  52. GRB 020812: early time optical observation at Ouda Station
  53. GRB020813: VRI Decay Slopes
  54. GRB020813: Magellan BVRI Photometry
  55. GRB 020819: Optical observations
  56. IPN triangulation of GRB020819 (HETE 2275)
  57. GRB020813: optical and NIR observations
  58. GRB020813: Fading X-ray Afterglow Observed with Chandra
  59. GRB020813, UBVRI field calibration
  60. Polarimetry of GRB020813: evidence for variability
  61. GRB020812: optical observations
  62. GRB020813: High-Resolution Optical Observations
  63. GRB 020812: optical observation at Bisei
  64. GRB020812: optical observations
  65. GRB 020813 : KISO multiband optical observations
  66. GRB020813, optical observations
  67. IPN error box for GRB020813
  68. GRB020812: possible afterglow candidate
  69. GRB020812: possible afterglow candidate
  70. GRB020813, astrometric position
  71. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  72. GRB 020812 optical observation
  73. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  74. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  75. HST Imaging of the Host of GRB 011121
  76. GRB020801, optical afterglow candidate
  77. GRB020331: Late-time Optical Light Curve (re-submission)
  78. GRB020331: Late-time Optical Light Curve
  79. IPN triangulation of GRB020714
  80. IPN triangulation of GRB020715 (=GRB150702)
  81. IPN triangulation of GRB020714
  82. IPN triangulation of GRB150702
  83. GRB 020410: Discovery of Probable OT by HST
  84. IPN triangulation of GRB020708
  85. IPN triangulation of GRB020708
  86. Correction to IPN error box for GRB020706
  87. IPN triangulation of GRB020706
  88. GRB 020705: Optical observations
  89. GRB 020625, optical observations
  90. GRB 020625: Optical observations
  91. GRB 020531: optical photometry of Chandra sources
  92. The Probable Host Galaxy of GRB/XRF 020427
  93. GRB/XRF 020427, detection of an underlying system with the VLT
  94. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  95. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  96. AXP 1E2259+586: quasi-simultaneous optical observation
  97. AXP 1E2259+586 optical observations
  98. Fading Optical Source in the Field of GRB020531
  99. GRB 020531, INT+WFC deep optical upper limits
  100. GRB020405: polarimetric 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