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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"

42583 results found.

  1. GRB030329, fading resumes
  2. GRB 030329, BVRI photometry
  3. GRB030329: Optical observations
  4. SDSS 0.5m PT observations of GRB030329 (correction)
  5. SDSS 0.5m PT observations of GRB030329
  6. GRB 030329, Optical observations
  7. GRB 030329, nearby galaxies
  8. GRB030329, cessation of fading
  9. GRB030329: final R-band light curve by MASTER
  10. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  11. GRB 030329: Sub-millimeter detection
  12. GRB 030329: SARA Optical Observations
  13. GRB 030329: SARA Optical Observations
  14. OT GRB light curves and SN predictions
  15. GRB030329, optical observation
  16. GRB030329, optical observation
  17. GRB030329, new UBVRcIc field photometry
  18. GRB 030329, light curve and SN prediction
  19. GRB030329: optical observations at Tokyo Tech
  20. GRB 030329: optical observations
  21. GRB030329: multiple re-brightening phases
  22. GRB 030329, BRI photometry
  23. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  24. GRB 030329 , SPM optical observations
  25. GRB 030329: Radio observations at GMRT
  26. Further AAVSO V,B,R observations of GRB030329
  27. GRB 030329: Additional Mt. Laguna Optical Observations
  28. GRB 030329: SARA Optical Observations
  29. GRB 030329: Observations with ANDICAM
  30. GRB030329: Optical observations
  31. GRB030329: further optical photometry and evidence for a light curve discontinuity
  32. GRB 030329: Correction to GCN 2056
  33. GRB 030329: fitting parameters and re-brightening
  34. GRB030329 Further RBO Optical Observations
  35. triangulation of GRB 030331 (single error box)
  36. GRB030329 - OT rebrightens
  37. GRB 030329: SARA Optical Observations
  38. AAVSO V & R observations of GRB030329
  39. IPN triangulation of GRB030331 (annulus)
  40. GRB 030329: optical observations
  41. IPN triangulation of GRB030329b (large error box)
  42. GRB 030329: beginning of the new fading phase in optical band
  43. GRB 030329, optical spectroscopy
  44. GRB 030329: fading X-ray afterglow with RXTE
  45. GRB 030329: optical photometry
  46. GRB030329: Optical observations
  47. Photometry of GRB030329 - Constant OT Magnitude
  48. GRB 030329, R-band observations
  49. GRB 030329, R-band light curve
  50. GRB 030329: further optical observations
  51. GRB030329 - OT brightens
  52. GRB030329 15 GHz radio observation
  53. GRB 030329, optical photometry
  54. GRB030329: Near Infrared Observations
  55. 030331 NOT A GRB
  56. GRB 030324: Optical and NIR Observations
  57. GRB 030328, optical photometry
  58. GRB030329: R band light curve by MASTER
  59. GRB030329 - Light curve flattening
  60. GRB 030329: SARA Optical Observations
  61. GRB 030324, optical search
  62. GRB030329 - near contemporaneous optical limits from CONCAM
  63. GRB030329: R and B observations
  64. GRB030329: Optical observations
  65. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  66. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  67. GRB 030329: Light curve observed during the change of its slope.
  68. GRB030329, BVRcIc field photometry
  69. GRB030329, SPM optical observations
  70. GRB 030329: Optical Decay
  71. Redshift of GRB 030329
  72. GRB030329: ROTSE network observes steepening of decay curve
  73. GRB 030329, optical photometry
  74. GRB 030329: Optical decay and synthesis
  75. GRB030329 optical observations
  76. GRB030329: optical spectroscopy with the TNG
  77. GRB 030329: Radio Observations
  78. GRB 030329, optical spectroscopy
  79. GRB 030329: still bright
  80. GRB 030329: Optical pre-Imaging
  81. GRB 030329: visual observations
  82. GRB 030329: Upper limit from 5.6 hours before trigger
  83. GRB030328: R optical observation
  84. GRB030328: X-ray Afterglow Observed with Chandra
  85. GRB 030323: Gemini South VRI obsevations.
  86. GRB030329: Optical observations
  87. GRB030329 optical observations
  88. GRB 030329: optical observations
  89. GRB 030329, R-band observations
  90. GRB 030329: OT B and R photometry, decline rate
  91. GRB030329: Upper limits from recent and historical observations.
  92. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  93. RXTE detection of GRB 030329 afterglow
  94. GRB 030329: Optical Afterglow Observations
  95. GRB 030329: precise position from Kyoto images
  96. GRB 030328 Optical Observations
  97. GRB030328: Decay index
  98. GRB 030328: Optical observations
  99. GRB 030328: optical observations
  100. GRB 030329: Optical afterglow fading

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