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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"

36132 results found.

  1. OT GRB 030329: early spectrum
  2. GRB030329: VR Photometry at TNG
  3. GRB030324: Candidate Optical Afterglow (Erratum)
  4. GRB030324: Candidate Optical Afterglow
  5. IPN triangulation of GRB030414 (small error box)
  6. GRB 030413: Optical Observations
  7. GRB 030329 Rc observations
  8. IPN triangulation of GRB030413 (small error box)
  9. IPN triangulation of GRB030410 (annulus)
  10. Superluminal motion in GRB 030329 (Correction)
  11. Superluminal motion in GRB 030329
  12. GRB 030329 and SN 2003dh
  13. GRB030329, optical position
  14. GRB 030329 VLBA Observations
  15. IPN triangulation of GRB030406 (small error box)
  16. IPN triangulation of GRB050403 (small error box)
  17. IPN triangulation of GRB030403 (annulus)
  18. GRB 030329: BVRI photometry at Asiago
  19. GRB 030329, light curve flattens
  20. GRB 030329: VLT V-band photometry
  21. If the SN/GRB connection confirmed
  22. GRB 030329: Supernova Confirmed
  23. GRB030329: RTT150 optical observations
  24. GRB030329: Near Infrared Observations at Gunma
  25. GRB030329: HET spectroscopic monitoring
  26. Kiso observation of the GRB030329 at April 6
  27. GRB 030329, color evolution
  28. GRB030328, UBVRcIc field photometry
  29. GRB 030329 Optical observations
  30. GRB 030329, color evolution
  31. GRB 030329: possible color change
  32. GRB030329: RTT150 optical observations
  33. GRB 030329: Supernova Spectrum Emerging
  34. GRB030329: Kiso B and R band observations
  35. GRB030329: RTT150 optical observation
  36. GRB030329: More AAVSO VR obs
  37. GRB030328: R upper limit after 6 hours by MASTER
  38. GRB 030329: BV photographic observations
  39. GRB 030329: SARA Optical Observations
  40. GRB 030329: SARA Optical Observations
  41. GRB030329, fading resumes
  42. GRB 030329, BVRI photometry
  43. SDSS 0.5m PT observations of GRB030329 (correction)
  44. SDSS 0.5m PT observations of GRB030329
  45. GRB 030329, Optical observations
  46. GRB 030329, nearby galaxies
  47. GRB030329, cessation of fading
  48. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  49. GRB 030329: Sub-millimeter detection
  50. GRB 030329: SARA Optical Observations
  51. GRB 030329: SARA Optical Observations
  52. OT GRB light curves and SN predictions
  53. GRB030329, optical observation
  54. GRB030329, new UBVRcIc field photometry
  55. GRB 030329, light curve and SN prediction
  56. GRB030329: optical observations at Tokyo Tech
  57. GRB 030329: optical observations
  58. GRB030329: multiple re-brightening phases
  59. GRB 030329, BRI photometry
  60. GRB 030329 , SPM optical observations
  61. GRB 030329: Radio observations at GMRT
  62. Further AAVSO V,B,R observations of GRB030329
  63. GRB 030329: Additional Mt. Laguna Optical Observations
  64. GRB 030329: SARA Optical Observations
  65. GRB 030329: Observations with ANDICAM
  66. GRB030329: further optical photometry and evidence for a light curve discontinuity
  67. GRB 030329: Correction to GCN 2056
  68. GRB 030329: fitting parameters and re-brightening
  69. GRB 030329: KAIT optical photometry
  70. GRB030329 Further RBO Optical Observations
  71. triangulation of GRB 030331 (single error box)
  72. GRB030329 - OT rebrightens
  73. GRB 030329: SARA Optical Observations
  74. AAVSO V & R observations of GRB030329
  75. IPN triangulation of GRB030331 (annulus)
  76. GRB 030329: optical observations
  77. IPN triangulation of GRB030329b (large error box)
  78. GRB 030329: beginning of the new fading phase in optical band
  79. GRB 030329, optical spectroscopy
  80. GRB 030329: fading X-ray afterglow with RXTE
  81. GRB 030329: optical photometry
  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

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