Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

41188 results found.

  1. GRB030329: Optical observations
  2. GRB030329: further optical photometry and evidence for a light curve discontinuity
  3. GRB 030329: fitting parameters and re-brightening
  4. GRB 030329: KAIT optical photometry
  5. GRB030329 Further RBO Optical Observations
  6. GRB 030329: SARA Optical Observations
  7. AAVSO V & R observations of GRB030329
  8. GRB 030329: optical observations
  9. GRB 030329: beginning of the new fading phase in optical band
  10. GRB 030329, optical spectroscopy
  11. GRB 030329: fading X-ray afterglow with RXTE
  12. GRB 030329: optical photometry
  13. GRB030329: Optical observations
  14. Photometry of GRB030329 - Constant OT Magnitude
  15. GRB 030329, R-band observations
  16. GRB 030329, R-band light curve
  17. GRB 030329: further optical observations
  18. GRB030329 - OT brightens
  19. GRB 030329: OT observations at Kanazawa
  20. GRB030329 15 GHz radio observation
  21. GRB 030329 RBO V Optical Observations
  22. GRB 030329, optical photometry
  23. GRB030329: Near Infrared Observations
  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. GRB030329: R and B observations
  32. GRB 030329, optical observations
  33. GRB030329: Optical observations
  34. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  35. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  36. GRB 030329: Light curve observed during the change of its slope.
  37. GRB030329, BVRcIc field photometry
  38. GRB030329, SPM optical observations
  39. GRB 030329: Optical Decay
  40. Redshift of GRB 030329
  41. GRB030329: ROTSE network observes steepening of decay curve
  42. GRB 030329, optical photometry
  43. GRB 030329: Optical decay and synthesis
  44. GRB030329 optical observations
  45. GRB030329: optical spectroscopy with the TNG
  46. GRB 030329: Radio Observations
  47. GRB 030329, optical spectroscopy
  48. GRB 030329: still bright
  49. GRB 030329: Optical pre-Imaging
  50. GRB 030329: visual observations
  51. GRB 030329: Upper limit from 5.6 hours before trigger
  52. GRB030328: R optical observation
  53. GRB030328: X-ray Afterglow Observed with Chandra
  54. GRB 030323: Gemini South VRI obsevations.
  55. GRB030329: Optical observations
  56. GRB 030329, R-band observations, supplement
  57. GRB030329 optical observations
  58. GRB030329:optical observations by MASTER
  59. GRB 030329: optical observations
  60. GRB 030329, R-band observations
  61. GRB 030329: OT B and R photometry, decline rate
  62. GRB030329: Upper limits from recent and historical observations.
  63. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  64. RXTE detection of GRB 030329 afterglow
  65. GRB 030329: Optical Afterglow Observations
  66. GRB 030329: precise position from Kyoto images
  67. GRB 030328 Optical Observations
  68. GRB030328: Decay index
  69. GRB 030328: Optical observations
  70. GRB 030328: optical observations
  71. GRB 030329: Optical afterglow fading
  72. GRB 030329 follow-up
  73. GRB 030329: Optical afterglow candidate
  74. GRB 030329: OT candidate
  75. GRB 030329: Optical afterglow candidate
  76. GRB 030328: OT photometry
  77. GRB030328: optical spectroscopy at TNG
  78. GRB030328: optical photometry at the TNG
  79. VLT spectra of GRB 030328
  80. GRB 030328, optical spectroscopy
  81. GRB 030328, optical observations
  82. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  83. GRB 030328: Optical observations
  84. GRB 030328: Finding chart
  85. GRB 030328: Optical afterglow candidate
  86. GRB030323 optical observations
  87. GRB030324 optical observation
  88. GRB030131, BVRcIc field photometry
  89. Possible GRB030323 localized by INTEGRAL
  90. GRB030323: Detection on 2003/03/24
  91. GRB 030323: SARA Optical Observations
  92. GRB030324, optical observations
  93. GRB030324, optical observations
  94. GRB 030324: TAROT optical observations
  95. GRB030323: V, R, I photometry
  96. GRB 030324 (HETE #2641): Optical observations
  97. GRB030324, Optical Observations
  98. GRB030323: Upper limits from recent and historical observations.
  99. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  100. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM

Advanced

Download all Circulars as a .tar.gz archive:
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