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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"

32485 results found.

  1. GRB030329: optical polarization
  2. GRB030329, optical observation
  3. GRB030329: 444 AAVSO Measurements
  4. ROTSE-III prompt optical detections of GRB 030418
  5. GRB030418: Upper limits from recent and historical observations.
  6. GRB 030418: Optical afterglow
  7. GRB 030418: Finder for afterglow candidate
  8. GRB 030329 OT position
  9. GRB030329: Optical Observations
  10. OT GRB 030329: early UBVRcIc spectral evolution
  11. GRB030329, UBVRI polarimetry, R-polarization
  12. GRB 030329: SARA Optical Observations
  13. OT GRB 030329: early spectrum
  14. GRB030329: VR Photometry at TNG
  15. GRB030324: Candidate Optical Afterglow
  16. GRB 030413: Optical Observations
  17. GRB 030329 Rc observations
  18. Superluminal motion in GRB 030329 (Correction)
  19. Superluminal motion in GRB 030329
  20. GRB 030329 and SN 2003dh
  21. GRB030329, optical position
  22. GRB 030329 VLBA Observations
  23. GRB 030329: BVRI photometry at Asiago
  24. GRB 030329, light curve flattens
  25. GRB 030329: VLT V-band photometry
  26. If the SN/GRB connection confirmed
  27. GRB 030329: Supernova Confirmed
  28. GRB030329: RTT150 optical observations
  29. GRB030329: Near Infrared Observations at Gunma
  30. GRB030329: HET spectroscopic monitoring
  31. GRB 030329, color evolution
  32. GRB030328, UBVRcIc field photometry
  33. GRB030329: Optical observcations
  34. GRB030329: BV photographic observations
  35. GRB 030329 Optical observations
  36. GRB 030329, color evolution
  37. GRB 030329: possible color change
  38. GRB030329: RTT150 optical observations
  39. GRB 030329: Supernova Spectrum Emerging
  40. GRB030329: RTT150 optical observation
  41. GRB030329: More AAVSO VR obs
  42. GRB030328: R upper limit after 6 hours by MASTER
  43. GRB 030329: BV photographic observations
  44. GRB 030329: SARA Optical Observations
  45. GRB 030329: SARA Optical Observations
  46. GRB030329, fading resumes
  47. GRB 030329, BVRI photometry
  48. GRB030329: Optical observations
  49. SDSS 0.5m PT observations of GRB030329 (correction)
  50. SDSS 0.5m PT observations of GRB030329
  51. GRB 030329, Optical observations
  52. GRB 030329, nearby galaxies
  53. GRB030329, cessation of fading
  54. GRB030329: final R-band light curve by MASTER
  55. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  56. GRB 030329: Sub-millimeter detection
  57. GRB 030329: SARA Optical Observations
  58. GRB 030329: SARA Optical Observations
  59. OT GRB light curves and SN predictions
  60. GRB030329, optical observation
  61. GRB030329, optical observation
  62. GRB030329, new UBVRcIc field photometry
  63. GRB 030329, light curve and SN prediction
  64. GRB030329: optical observations at Tokyo Tech
  65. GRB 030329: optical observations
  66. GRB030329: multiple re-brightening phases
  67. GRB 030329, BRI photometry
  68. GRB030329: Optical observations at Teramo
  69. GRB030329: more 15GHz observations
  70. Further AAVSO V,B,R observations of GRB030329
  71. GRB 030329: Additional Mt. Laguna Optical Observations
  72. GRB 030329: SARA Optical Observations
  73. GRB 030329: Observations with ANDICAM
  74. GRB030329: Optical observations
  75. GRB 030329: Correction to GCN 2056
  76. GRB 030329: fitting parameters and re-brightening
  77. GRB 030329: KAIT optical photometry
  78. GRB030329 Further RBO Optical Observations
  79. triangulation of GRB 030331 (single error box)
  80. GRB030329 - OT rebrightens
  81. GRB 030329: SARA Optical Observations
  82. AAVSO V & R observations of GRB030329
  83. GRB 030329: optical observations
  84. IPN triangulation of GRB030329b (large error box)
  85. GRB 030329: beginning of the new fading phase in optical band
  86. GRB 030329, optical spectroscopy
  87. GRB 030329: fading X-ray afterglow with RXTE
  88. GRB 030329: optical photometry
  89. GRB030329: Optical observations
  90. Photometry of GRB030329 - Constant OT Magnitude
  91. GRB 030329, R-band light curve
  92. GRB 030329: further optical observations
  93. GRB030329 - OT brightens
  94. GRB 030329: OT observations at Kanazawa
  95. GRB030329 15 GHz radio observation
  96. GRB 030329 RBO V Optical Observations
  97. GRB 030329, optical photometry
  98. GRB030329: Near Infrared Observations
  99. GRB 030324: Optical and NIR Observations
  100. GRB 030328, optical photometry

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