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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"

36144 results found.

  1. IPN triangulation of GRB030419 (annulus)
  2. MASTER:optical observations GRB030416
  3. ROTSE-III prompt optical detections of GRB 030418
  4. GRB030418: Upper limits from recent and historical observations.
  5. GRB030418: Kiso near infrared observations
  6. GRB 030418: Optical afterglow
  7. GRB 030418: Finder for afterglow candidate
  8. GRB 030418: Optical afterglow candidate
  9. GRB 030329 OT position
  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 (Erratum)
  16. GRB030324: Candidate Optical Afterglow
  17. IPN triangulation of GRB030414 (small error box)
  18. GRB 030413: Optical Observations
  19. GRB 030329 Rc observations
  20. IPN triangulation of GRB030413 (small error box)
  21. IPN triangulation of GRB030410 (annulus)
  22. Superluminal motion in GRB 030329 (Correction)
  23. Superluminal motion in GRB 030329
  24. GRB 030329 and SN 2003dh
  25. GRB030329, optical position
  26. GRB 030329 VLBA Observations
  27. IPN triangulation of GRB030406 (small error box)
  28. IPN triangulation of GRB050403 (small error box)
  29. IPN triangulation of GRB030403 (annulus)
  30. GRB 030329: BVRI photometry at Asiago
  31. GRB 030329, light curve flattens
  32. GRB 030329: VLT V-band photometry
  33. If the SN/GRB connection confirmed
  34. GRB 030329: Supernova Confirmed
  35. GRB030329: RTT150 optical observations
  36. GRB030329: Near Infrared Observations at Gunma
  37. GRB030329: HET spectroscopic monitoring
  38. Kiso observation of the GRB030329 at April 6
  39. GRB 030329, color evolution
  40. GRB030328, UBVRcIc field photometry
  41. GRB 030329 Optical observations
  42. GRB 030329, color evolution
  43. GRB 030329: possible color change
  44. GRB030329: RTT150 optical observations
  45. GRB 030329: Supernova Spectrum Emerging
  46. GRB030329: Kiso B and R band observations
  47. GRB030329: RTT150 optical observation
  48. GRB030329: More AAVSO VR obs
  49. GRB030328: R upper limit after 6 hours by MASTER
  50. GRB 030329: BV photographic observations
  51. GRB 030329: SARA Optical Observations
  52. GRB 030329: SARA Optical Observations
  53. GRB030329, fading resumes
  54. GRB 030329, BVRI photometry
  55. SDSS 0.5m PT observations of GRB030329 (correction)
  56. SDSS 0.5m PT observations of GRB030329
  57. GRB 030329, Optical observations
  58. GRB 030329, nearby galaxies
  59. GRB030329, cessation of fading
  60. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  61. GRB 030329: Sub-millimeter detection
  62. GRB 030329: SARA Optical Observations
  63. GRB 030329: SARA Optical Observations
  64. OT GRB light curves and SN predictions
  65. GRB030329, optical observation
  66. GRB030329, new UBVRcIc field photometry
  67. GRB 030329, light curve and SN prediction
  68. GRB030329: optical observations at Tokyo Tech
  69. GRB 030329: optical observations
  70. GRB030329: multiple re-brightening phases
  71. GRB 030329, BRI photometry
  72. GRB 030329 , SPM optical observations
  73. GRB 030329: Radio observations at GMRT
  74. Further AAVSO V,B,R observations of GRB030329
  75. GRB 030329: Additional Mt. Laguna Optical Observations
  76. GRB 030329: SARA Optical Observations
  77. GRB 030329: Observations with ANDICAM
  78. GRB030329: further optical photometry and evidence for a light curve discontinuity
  79. GRB 030329: Correction to GCN 2056
  80. GRB 030329: fitting parameters and re-brightening
  81. GRB 030329: KAIT optical photometry
  82. GRB030329 Further RBO Optical Observations
  83. triangulation of GRB 030331 (single error box)
  84. GRB030329 - OT rebrightens
  85. GRB 030329: SARA Optical Observations
  86. AAVSO V & R observations of GRB030329
  87. IPN triangulation of GRB030331 (annulus)
  88. GRB 030329: optical observations
  89. IPN triangulation of GRB030329b (large error box)
  90. GRB 030329: beginning of the new fading phase in optical band
  91. GRB 030329, optical spectroscopy
  92. GRB 030329: fading X-ray afterglow with RXTE
  93. GRB 030329: optical photometry
  94. Photometry of GRB030329 - Constant OT Magnitude
  95. GRB 030329, R-band observations
  96. GRB 030329, R-band light curve
  97. GRB 030329: further optical observations
  98. GRB030329 - OT brightens
  99. GRB 030329: OT observations at Kanazawa
  100. GRB030329 15 GHz radio observation

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