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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"

36785 results found.

  1. SDSS 0.5m PT observations of GRB030329
  2. GRB 030329, Optical observations
  3. GRB 030329, nearby galaxies
  4. GRB030329, cessation of fading
  5. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  6. GRB 030329: Sub-millimeter detection
  7. GRB 030329: SARA Optical Observations
  8. GRB 030329: SARA Optical Observations
  9. OT GRB light curves and SN predictions
  10. GRB030329, optical observation
  11. GRB030329, new UBVRcIc field photometry
  12. GRB 030329, light curve and SN prediction
  13. GRB030329: optical observations at Tokyo Tech
  14. GRB 030329: optical observations
  15. GRB030329: multiple re-brightening phases
  16. GRB 030329, BRI photometry
  17. GRB 030329 , SPM optical observations
  18. GRB 030329: Radio observations at GMRT
  19. Further AAVSO V,B,R observations of GRB030329
  20. GRB 030329: Additional Mt. Laguna Optical Observations
  21. GRB 030329: SARA Optical Observations
  22. GRB 030329: Observations with ANDICAM
  23. GRB030329: further optical photometry and evidence for a light curve discontinuity
  24. GRB 030329: Correction to GCN 2056
  25. GRB 030329: fitting parameters and re-brightening
  26. GRB 030329: KAIT optical photometry
  27. GRB030329 Further RBO Optical Observations
  28. triangulation of GRB 030331 (single error box)
  29. GRB030329 - OT rebrightens
  30. GRB 030329: SARA Optical Observations
  31. AAVSO V & R observations of GRB030329
  32. IPN triangulation of GRB030331 (annulus)
  33. GRB 030329: optical observations
  34. IPN triangulation of GRB030329b (large error box)
  35. GRB 030329: beginning of the new fading phase in optical band
  36. GRB 030329, optical spectroscopy
  37. GRB 030329: fading X-ray afterglow with RXTE
  38. GRB 030329: optical photometry
  39. Photometry of GRB030329 - Constant OT Magnitude
  40. GRB 030329, R-band observations
  41. GRB 030329, R-band light curve
  42. GRB 030329: further optical observations
  43. GRB030329 - OT brightens
  44. GRB 030329: OT observations at Kanazawa
  45. GRB030329 15 GHz radio observation
  46. GRB 030329 RBO V Optical Observations
  47. GRB 030329, optical photometry
  48. GRB030329: Near Infrared Observations
  49. 030331 NOT A GRB
  50. INTEGRAL GRB 030331
  51. GRB 030324: Optical and NIR Observations
  52. GRB 030328, optical photometry
  53. GRB030329: R band light curve by MASTER
  54. GRB030329 - Light curve flattening
  55. GRB 030329: SARA Optical Observations
  56. GRB 030324, optical search
  57. GRB030329 - near contemporaneous optical limits from CONCAM
  58. GRB 030329, optical observations
  59. GRB 030329: Light curve observed during the change of its slope.
  60. GRB030329, BVRcIc field photometry
  61. GRB030329, SPM optical observations
  62. GRB 030329: Optical Decay
  63. Redshift of GRB 030329
  64. GRB030329: ROTSE network observes steepening of decay curve
  65. GRB 030329, optical photometry
  66. GRB 030329: Optical decay and synthesis
  67. GRB 030329: Radio Observations
  68. GRB 030329, optical spectroscopy
  69. GRB 030329: still bright
  70. GRB 030329: Optical pre-Imaging
  71. GRB 030329: visual observations
  72. GRB 030329: Upper limit from 5.6 hours before trigger
  73. GRB030328: R optical observation
  74. GRB 030323: Gemini South VRI obsevations.
  75. GRB030329: Optical observations
  76. GRB 030329, R-band observations, supplement
  77. GRB030329:optical observations by MASTER
  78. GRB 030329: optical observations
  79. GRB 030329, R-band observations
  80. GRB 030329: OT B and R photometry, decline rate
  81. GRB030329: Upper limits from recent and historical observations.
  82. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  83. RXTE detection of GRB 030329 afterglow
  84. GRB 030329: Optical Afterglow Observations
  85. GRB 030329: precise position from Kyoto images
  86. GRB 030328 Optical Observations
  87. GRB 030328: Optical observations
  88. GRB 030328: optical observations
  89. GRB 030329: Optical afterglow fading
  90. GRB 030329 follow-up
  91. GRB 030329: Optical afterglow candidate
  92. GRB 030329: OT candidate
  93. GRB 030329: Optical afterglow candidate
  94. GRB 030328: OT photometry
  95. VLT spectra of GRB 030328
  96. GRB 030328, optical spectroscopy
  97. GRB 030328, optical observations
  98. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  99. GRB 030328: Optical observations
  100. Re: GRB 030328: Finding chart

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