Skip to main content
Announcing GCN Classic Migration Survey, End of Legacy Circulars Email. 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. GRB030329, optical position
  2. GRB 030329 VLBA Observations
  3. CORRECTION TO IPN TRIANGULATION OF GRB050403
  4. IPN triangulation of GRB030406 (small error box)
  5. IPN triangulation of GRB050403 (small error box)
  6. IPN triangulation of GRB030403 (annulus)
  7. GRB 030329: BVRI photometry at Asiago
  8. GRB 030329, light curve flattens
  9. GRB 030329: VLT V-band photometry
  10. If the SN/GRB connection confirmed
  11. GRB 030329: Supernova Confirmed
  12. GRB030329: RTT150 optical observations
  13. GRB030329: Near Infrared Observations at Gunma
  14. GRB030329: HET spectroscopic monitoring
  15. Kiso observation of the GRB030329 at April 6
  16. GRB 030329, color evolution
  17. GRB030328, UBVRcIc field photometry
  18. GRB030329: Optical observcations
  19. GRB030329: BV photographic observations
  20. GRB 030329 Optical observations
  21. GRB 030329, color evolution
  22. GRB 030329: possible color change
  23. GRB030329: RTT150 optical observations
  24. GRB 030329: Supernova Spectrum Emerging
  25. GRB030329: Kiso B and R band observations
  26. GRB030329: RTT150 optical observation
  27. GRB030329: More AAVSO VR obs
  28. GRB030328: R upper limit after 6 hours by MASTER
  29. GRB 030329: BV photographic observations
  30. GRB 030329: SARA Optical Observations
  31. GRB 030329: SARA Optical Observations
  32. GRB030329, fading resumes
  33. GRB 030329, BVRI photometry
  34. GRB030329: Optical observations
  35. SDSS 0.5m PT observations of GRB030329 (correction)
  36. SDSS 0.5m PT observations of GRB030329
  37. GRB 030329, Optical observations
  38. GRB 030329, nearby galaxies
  39. GRB030329, cessation of fading
  40. GRB030329: final R-band light curve by MASTER
  41. GRB030329 - more 15 GHz radio data
  42. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  43. GRB 030329: Sub-millimeter detection
  44. GRB 030329: SARA Optical Observations
  45. GRB 030329: SARA Optical Observations
  46. OT GRB light curves and SN predictions
  47. GRB030329, optical observation
  48. GRB030329, optical observation
  49. GRB030329, new UBVRcIc field photometry
  50. GRB 030329, light curve and SN prediction
  51. GRB030329: optical observations at Tokyo Tech
  52. GRB 030329: optical observations
  53. GRB030329: multiple re-brightening phases
  54. GRB 030329, BRI photometry
  55. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  56. GRB 030329 , SPM optical observations
  57. GRB030329: Optical observations at Teramo
  58. GRB 030329: Radio observations at GMRT
  59. GRB030329: more 15GHz observations
  60. Further AAVSO V,B,R observations of GRB030329
  61. GRB 030329: Additional Mt. Laguna Optical Observations
  62. GRB 030329: SARA Optical Observations
  63. GRB 030329: Observations with ANDICAM
  64. GRB030329: Optical observations
  65. GRB030329: further optical photometry and evidence for a light curve discontinuity
  66. GRB 030329: Correction to GCN 2056
  67. GRB 030329: fitting parameters and re-brightening
  68. GRB 030329: KAIT optical photometry
  69. GRB030329 Further RBO Optical Observations
  70. triangulation of GRB 030331 (single error box)
  71. GRB030329 - OT rebrightens
  72. GRB 030329: SARA Optical Observations
  73. AAVSO V & R observations of GRB030329
  74. IPN triangulation of GRB030331 (annulus)
  75. GRB 030329: optical observations
  76. IPN triangulation of GRB030329b (large error box)
  77. GRB 030329: beginning of the new fading phase in optical band
  78. GRB 030329, optical spectroscopy
  79. GRB 030329: fading X-ray afterglow with RXTE
  80. GRB 030329: optical photometry
  81. GRB030329: Optical observations
  82. Photometry of GRB030329 - Constant OT Magnitude
  83. GRB 030329, R-band observations
  84. GRB 030329, R-band light curve
  85. GRB 030329: further optical observations
  86. GRB030329 - OT brightens
  87. GRB 030329: OT observations at Kanazawa
  88. GRB030329 15 GHz radio observation
  89. GRB 030329 RBO V Optical Observations
  90. GRB 030329, optical photometry
  91. GRB030329: Near Infrared Observations
  92. 030331 NOT A GRB
  93. INTEGRAL GRB 030331
  94. GRB 030324: Optical and NIR Observations
  95. GRB 030328, optical photometry
  96. GRB030329: R band light curve by MASTER
  97. GRB030329 - Light curve flattening
  98. GRB 030329: SARA Optical Observations
  99. GRB 030324, optical search
  100. GRB030329 - near contemporaneous optical limits from CONCAM

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