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"

37758 results found.

  1. triangulation of GRB 030331 (single error box)
  2. GRB030329 - OT rebrightens
  3. GRB 030329: SARA Optical Observations
  4. AAVSO V & R observations of GRB030329
  5. IPN triangulation of GRB030331 (annulus)
  6. GRB 030329: optical observations
  7. IPN triangulation of GRB030329b (large error box)
  8. GRB 030329: beginning of the new fading phase in optical band
  9. GRB 030329, optical spectroscopy
  10. GRB 030329: fading X-ray afterglow with RXTE
  11. GRB 030329: optical photometry
  12. Photometry of GRB030329 - Constant OT Magnitude
  13. GRB 030329, R-band observations
  14. GRB 030329, R-band light curve
  15. GRB 030329: further optical observations
  16. GRB030329 - OT brightens
  17. GRB 030329: OT observations at Kanazawa
  18. GRB030329 15 GHz radio observation
  19. GRB 030329 RBO V Optical Observations
  20. GRB 030329, optical photometry
  21. GRB030329: Near Infrared Observations
  22. 030331 NOT A GRB
  23. INTEGRAL GRB 030331
  24. GRB 030324: Optical and NIR Observations
  25. GRB 030328, optical photometry
  26. GRB030329: R band light curve by MASTER
  27. GRB030329 - Light curve flattening
  28. GRB 030329: SARA Optical Observations
  29. GRB 030324, optical search
  30. GRB030329 - near contemporaneous optical limits from CONCAM
  31. GRB 030329, optical observations
  32. GRB 030329: Light curve observed during the change of its slope.
  33. GRB030329, BVRcIc field photometry
  34. GRB030329, SPM optical observations
  35. GRB 030329: Optical Decay
  36. Redshift of GRB 030329
  37. GRB030329: ROTSE network observes steepening of decay curve
  38. GRB 030329, optical photometry
  39. GRB 030329: Optical decay and synthesis
  40. GRB 030329: Radio Observations
  41. GRB 030329, optical spectroscopy
  42. GRB 030329: still bright
  43. GRB 030329: Optical pre-Imaging
  44. GRB 030329: visual observations
  45. GRB 030329: Upper limit from 5.6 hours before trigger
  46. GRB030328: R optical observation
  47. GRB 030323: Gemini South VRI obsevations.
  48. GRB030329: Optical observations
  49. GRB 030329, R-band observations, supplement
  50. GRB030329:optical observations by MASTER
  51. GRB 030329: optical observations
  52. GRB 030329, R-band observations
  53. GRB 030329: OT B and R photometry, decline rate
  54. GRB030329: Upper limits from recent and historical observations.
  55. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  56. RXTE detection of GRB 030329 afterglow
  57. GRB 030329: Optical Afterglow Observations
  58. GRB 030329: precise position from Kyoto images
  59. GRB 030328 Optical Observations
  60. GRB 030328: Optical observations
  61. GRB 030328: optical observations
  62. GRB 030329: Optical afterglow fading
  63. GRB 030329 follow-up
  64. GRB 030329: Optical afterglow candidate
  65. GRB 030329: OT candidate
  66. GRB 030329: Optical afterglow candidate
  67. GRB 030328: OT photometry
  68. VLT spectra of GRB 030328
  69. GRB 030328, optical spectroscopy
  70. GRB 030328, optical observations
  71. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  72. GRB 030328: Optical observations
  73. Re: GRB 030328: Finding chart
  74. GRB 030328: Finding chart
  75. GRB 030328: Optical afterglow candidate
  76. GRB030131, BVRcIc field photometry
  77. Possible GRB030323 localized by INTEGRAL
  78. IPN triangulation of GRB030325 (final analysis)
  79. IPN triangulation of GRB030326 (single small error box)
  80. GRB 030323: SARA Optical Observations
  81. IPN triangulation of GRB030325 (single small error box)
  82. GRB030324, optical observations
  83. IPN triangulation of GRB030325 (two small error boxes)
  84. GRB 030324: TAROT optical observations
  85. GRB 030324 (HETE #2641): Optical observations
  86. GRB030324, Optical Observations
  87. GRB030323: Upper limits from recent and historical observations.
  88. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  89. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  90. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  91. VLT/FORS2 spectra of GRB 030323
  92. GRB030323, ROTSE-III detection of possible optical counterpart
  93. GRB030323, optical observations
  94. GRB030324, BVRcIc field photometry
  95. GRB030323, possible optical counterpart
  96. GRB030323, BVRcIc field calibration
  97. GRB 030324 optical observations
  98. GRB 030320: Optical Observations
  99. GRB 030324, optical observations
  100. IPN triangulation of GRB030320B (annulus)

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