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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"

42564 results found.

  1. IPN triangulation of GRB030410 (annulus)
  2. Superluminal motion in GRB 030329 (Correction)
  3. Superluminal motion in GRB 030329
  4. GRB 030329 and SN 2003dh
  5. GRB030329, optical position
  6. GRB 030329 VLBA Observations
  7. IPN triangulation of GRB030406 (small error box)
  8. IPN triangulation of GRB050403 (small error box)
  9. IPN triangulation of GRB030403 (annulus)
  10. GRB 030329: BVRI photometry at Asiago
  11. GRB 030329, light curve flattens
  12. GRB 030329: VLT V-band photometry
  13. If the SN/GRB connection confirmed
  14. GRB 030329: Supernova Confirmed
  15. GRB030329: RTT150 optical observations
  16. GRB030329: HET spectroscopic monitoring
  17. GRB 030329, color evolution
  18. GRB030328, UBVRcIc field photometry
  19. GRB030329: Optical observcations
  20. GRB030329: BV photographic observations
  21. GRB 030329, color evolution
  22. GRB030329: RTT150 optical observations
  23. GRB 030329: Supernova Spectrum Emerging
  24. GRB030329: RTT150 optical observation
  25. GRB030329: More AAVSO VR obs
  26. GRB030328: R upper limit after 6 hours by MASTER
  27. GRB 030329: SARA Optical Observations
  28. GRB 030329: SARA Optical Observations
  29. GRB030329, fading resumes
  30. GRB 030329, BVRI photometry
  31. GRB030329: Optical observations
  32. SDSS 0.5m PT observations of GRB030329 (correction)
  33. SDSS 0.5m PT observations of GRB030329
  34. GRB 030329, Optical observations
  35. GRB 030329, nearby galaxies
  36. GRB030329, cessation of fading
  37. GRB030329: final R-band light curve by MASTER
  38. GRB 030329: Sub-millimeter detection
  39. GRB 030329: SARA Optical Observations
  40. GRB 030329: SARA Optical Observations
  41. OT GRB light curves and SN predictions
  42. GRB030329, optical observation
  43. GRB030329, optical observation
  44. GRB030329, new UBVRcIc field photometry
  45. GRB 030329, light curve and SN prediction
  46. GRB030329: optical observations at Tokyo Tech
  47. GRB 030329: optical observations
  48. GRB030329: multiple re-brightening phases
  49. GRB 030329, BRI photometry
  50. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  51. GRB 030329 , SPM optical observations
  52. GRB 030329: Radio observations at GMRT
  53. Further AAVSO V,B,R observations of GRB030329
  54. GRB 030329: Additional Mt. Laguna Optical Observations
  55. GRB 030329: SARA Optical Observations
  56. GRB 030329: Observations with ANDICAM
  57. GRB030329: Optical observations
  58. GRB030329: further optical photometry and evidence for a light curve discontinuity
  59. GRB 030329: Correction to GCN 2056
  60. GRB 030329: fitting parameters and re-brightening
  61. GRB030329 Further RBO Optical Observations
  62. triangulation of GRB 030331 (single error box)
  63. GRB030329 - OT rebrightens
  64. GRB 030329: SARA Optical Observations
  65. AAVSO V & R observations of GRB030329
  66. IPN triangulation of GRB030331 (annulus)
  67. GRB 030329: optical observations
  68. IPN triangulation of GRB030329b (large error box)
  69. GRB 030329: beginning of the new fading phase in optical band
  70. GRB 030329, optical spectroscopy
  71. GRB 030329: fading X-ray afterglow with RXTE
  72. GRB 030329: optical photometry
  73. GRB030329: Optical observations
  74. Photometry of GRB030329 - Constant OT Magnitude
  75. GRB 030329, R-band observations
  76. GRB 030329, R-band light curve
  77. GRB 030329: further optical observations
  78. GRB030329 - OT brightens
  79. GRB030329 15 GHz radio observation
  80. GRB 030329, optical photometry
  81. GRB030329: Near Infrared Observations
  82. 030331 NOT A GRB
  83. GRB 030324: Optical and NIR Observations
  84. GRB 030328, optical photometry
  85. GRB030329: R band light curve by MASTER
  86. GRB030329 - Light curve flattening
  87. GRB 030329: SARA Optical Observations
  88. GRB 030324, optical search
  89. GRB030329 - near contemporaneous optical limits from CONCAM
  90. GRB030329: R and B observations
  91. GRB030329: Optical observations
  92. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  93. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  94. GRB 030329: Light curve observed during the change of its slope.
  95. GRB030329, BVRcIc field photometry
  96. GRB030329, SPM optical observations
  97. GRB 030329: Optical Decay
  98. Redshift of GRB 030329
  99. GRB030329: ROTSE network observes steepening of decay curve
  100. GRB 030329, optical photometry

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