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"

32507 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. GRB 030329: optical observations
  6. IPN triangulation of GRB030329b (large error box)
  7. GRB 030329: beginning of the new fading phase in optical band
  8. GRB 030329, optical spectroscopy
  9. GRB 030329: fading X-ray afterglow with RXTE
  10. GRB 030329: optical photometry
  11. GRB030329: Optical observations
  12. Photometry of GRB030329 - Constant OT Magnitude
  13. GRB 030329, R-band light curve
  14. GRB 030329: further optical observations
  15. GRB030329 - OT brightens
  16. GRB 030329: OT observations at Kanazawa
  17. GRB030329 15 GHz radio observation
  18. GRB 030329 RBO V Optical Observations
  19. GRB 030329, optical photometry
  20. GRB030329: Near Infrared Observations
  21. GRB 030324: Optical and NIR Observations
  22. GRB 030328, optical photometry
  23. GRB030329: R band light curve by MASTER
  24. GRB030329 - Light curve flattening
  25. GRB 030329: SARA Optical Observations
  26. GRB 030324, optical search
  27. GRB030329 - near contemporaneous optical limits from CONCAM
  28. GRB030329: R and B observations
  29. GRB 030329, optical observations
  30. GRB030329: Optical observations
  31. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  32. GRB030329a: detection by Konus-Wind
  33. GRB 030329: Light curve observed during the change of its slope.
  34. GRB030329, BVRcIc field photometry
  35. GRB030329, SPM optical observations
  36. GRB 030329: Optical Decay
  37. Redshift of GRB 030329
  38. GRB030329: ROTSE network observes steepening of decay curve
  39. GRB 030329, optical photometry
  40. GRB 030329: Optical decay and synthesis
  41. GRB030329 optical observations
  42. GRB030329: optical spectroscopy with the TNG
  43. GRB 030329: Radio Observations
  44. GRB 030329, optical spectroscopy
  45. GRB 030329: still bright
  46. GRB 030329: Optical pre-Imaging
  47. GRB 030329: visual observations
  48. GRB 030329: Upper limit from 5.6 hours before trigger
  49. GRB030328: R optical observation
  50. GRB030328: X-ray Afterglow Observed with Chandra
  51. GRB 030323: Gemini South VRI obsevations.
  52. GRB030329: Optical observations
  53. GRB030329:optical observations by MASTER
  54. GRB 030329: optical observations
  55. GRB 030329, R-band observations
  56. GRB 030329: OT B and R photometry, decline rate
  57. GRB030329: Upper limits from recent and historical observations.
  58. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  59. GRB 030329: Optical Afterglow Observations
  60. GRB 030329: precise position from Kyoto images
  61. GRB 030328 Optical Observations
  62. GRB030328: Decay index
  63. GRB 030328: Optical observations
  64. GRB 030328: optical observations
  65. GRB 030329: Optical afterglow fading
  66. GRB 030328: OT photometry
  67. GRB030328: optical spectroscopy at TNG
  68. GRB030328: optical photometry at the TNG
  69. VLT spectra of GRB 030328
  70. GRB 030328, optical spectroscopy
  71. GRB 030328, optical observations
  72. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  73. GRB 030328: Optical observations
  74. GRB 030328: Finding chart
  75. GRB030323 optical observations
  76. GRB030131, BVRcIc field photometry
  77. IPN triangulation of GRB030325 (final analysis)
  78. GRB030323: Detection on 2003/03/24
  79. GRB 030323: SARA Optical Observations
  80. IPN triangulation of GRB030325 (single small error box)
  81. GRB030324, optical observations
  82. GRB030324, optical observations
  83. GRB 030324: TAROT optical observations
  84. GRB030323: V, R, I photometry
  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. GRB030323, possible optical counterpart
  95. GRB 030324 optical observations
  96. GRB 030320: Optical Observations
  97. IPN triangulation of GRB030320 (small error box)
  98. IPN triangulation of GRB030320
  99. GRB030226, addendum to GCN 1892
  100. IPN upper limit to a GRB associated with SN2003L

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