Skip to main content
GCN at AAS 245, Legacy Circulars Address Retirement. 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').
  1. OT GRB 030329: early UBVRcIc spectral evolution
  2. GRB030329, UBVRI polarimetry, R-polarization
  3. GRB 030329: SARA Optical Observations
  4. OT GRB 030329: early spectrum
  5. GRB030329: VR Photometry at TNG
  6. GRB030324: Candidate Optical Afterglow (Erratum)
  7. GRB030324: Candidate Optical Afterglow
  8. IPN triangulation of GRB030414 (small error box)
  9. GRB 030413: Optical Observations
  10. GRB 030329 Rc observations
  11. IPN triangulation of GRB030413 (small error box)
  12. IPN triangulation of GRB030410 (annulus)
  13. Superluminal motion in GRB 030329 (Correction)
  14. Superluminal motion in GRB 030329
  15. GRB 030329 and SN 2003dh
  16. GRB030329, optical position
  17. GRB 030329 VLBA Observations
  18. CORRECTION TO IPN TRIANGULATION OF GRB050403
  19. IPN triangulation of GRB030406 (small error box)
  20. IPN triangulation of GRB050403 (small error box)
  21. IPN triangulation of GRB030403 (annulus)
  22. GRB 030329: BVRI photometry at Asiago
  23. GRB 030329, light curve flattens
  24. GRB 030329: VLT V-band photometry
  25. If the SN/GRB connection confirmed
  26. GRB 030329: Supernova Confirmed
  27. GRB030329: RTT150 optical observations
  28. GRB030329: Near Infrared Observations at Gunma
  29. GRB030329: HET spectroscopic monitoring
  30. Kiso observation of the GRB030329 at April 6
  31. GRB 030329, color evolution
  32. GRB030328, UBVRcIc field photometry
  33. GRB030329: Optical observcations
  34. GRB030329: BV photographic observations
  35. GRB 030329 Optical observations
  36. GRB 030329, color evolution
  37. GRB 030329: possible color change
  38. GRB030329: RTT150 optical observations
  39. GRB 030329: Supernova Spectrum Emerging
  40. GRB030329: Kiso B and R band observations
  41. GRB030329: RTT150 optical observation
  42. GRB030329: More AAVSO VR obs
  43. GRB030328: R upper limit after 6 hours by MASTER
  44. GRB 030329: BV photographic observations
  45. GRB 030329: SARA Optical Observations
  46. GRB 030329: SARA Optical Observations
  47. GRB030329, fading resumes
  48. GRB 030329, BVRI photometry
  49. GRB030329: Optical observations
  50. SDSS 0.5m PT observations of GRB030329 (correction)
  51. SDSS 0.5m PT observations of GRB030329
  52. GRB 030329, Optical observations
  53. GRB 030329, nearby galaxies
  54. GRB030329, cessation of fading
  55. GRB030329: final R-band light curve by MASTER
  56. GRB030329 - more 15 GHz radio data
  57. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  58. GRB 030329: Sub-millimeter detection
  59. GRB 030329: SARA Optical Observations
  60. GRB 030329: SARA Optical Observations
  61. OT GRB light curves and SN predictions
  62. GRB030329, optical observation
  63. GRB030329, optical observation
  64. GRB030329, new UBVRcIc field photometry
  65. GRB 030329, light curve and SN prediction
  66. GRB030329: optical observations at Tokyo Tech
  67. GRB 030329: optical observations
  68. GRB030329: multiple re-brightening phases
  69. GRB 030329, BRI photometry
  70. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  71. GRB 030329 , SPM optical observations
  72. GRB030329: Optical observations at Teramo
  73. GRB 030329: Radio observations at GMRT
  74. GRB030329: more 15GHz observations
  75. Further AAVSO V,B,R observations of GRB030329
  76. GRB 030329: Additional Mt. Laguna Optical Observations
  77. GRB 030329: SARA Optical Observations
  78. GRB 030329: Observations with ANDICAM
  79. GRB030329: Optical observations
  80. GRB030329: further optical photometry and evidence for a light curve discontinuity
  81. GRB 030329: Correction to GCN 2056
  82. GRB 030329: fitting parameters and re-brightening
  83. GRB 030329: KAIT optical photometry
  84. GRB030329 Further RBO Optical Observations
  85. triangulation of GRB 030331 (single error box)
  86. GRB030329 - OT rebrightens
  87. GRB 030329: SARA Optical Observations
  88. AAVSO V & R observations of GRB030329
  89. IPN triangulation of GRB030331 (annulus)
  90. GRB 030329: optical observations
  91. IPN triangulation of GRB030329b (large error box)
  92. GRB 030329: beginning of the new fading phase in optical band
  93. GRB 030329, optical spectroscopy
  94. GRB 030329: fading X-ray afterglow with RXTE
  95. GRB 030329: optical photometry
  96. GRB030329: Optical observations
  97. Photometry of GRB030329 - Constant OT Magnitude
  98. GRB 030329, R-band observations
  99. GRB 030329, R-band light curve
  100. GRB 030329: further optical observations

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