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GCN Circulars

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

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