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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"

36149 results found.

  1. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  2. IPN triangulation of GRB030421 (annulus)
  3. MASTER:optical observations GRB030418
  4. MASTER:optical observations probable GRB030414
  5. GRB030329: 444 AAVSO Measurements
  6. IPN triangulation of GRB030419 (annulus)
  7. MASTER:optical observations GRB030416
  8. ROTSE-III prompt optical detections of GRB 030418
  9. GRB030418: Upper limits from recent and historical observations.
  10. GRB030418: Kiso near infrared observations
  11. GRB 030418: Optical afterglow
  12. GRB 030418: Finder for afterglow candidate
  13. GRB 030418: Optical afterglow candidate
  14. GRB 030329 OT position
  15. OT GRB 030329: early UBVRcIc spectral evolution
  16. GRB030329, UBVRI polarimetry, R-polarization
  17. GRB 030329: SARA Optical Observations
  18. OT GRB 030329: early spectrum
  19. GRB030329: VR Photometry at TNG
  20. GRB030324: Candidate Optical Afterglow (Erratum)
  21. GRB030324: Candidate Optical Afterglow
  22. IPN triangulation of GRB030414 (small error box)
  23. GRB 030413: Optical Observations
  24. GRB 030329 Rc observations
  25. IPN triangulation of GRB030413 (small error box)
  26. IPN triangulation of GRB030410 (annulus)
  27. Superluminal motion in GRB 030329 (Correction)
  28. Superluminal motion in GRB 030329
  29. GRB 030329 and SN 2003dh
  30. GRB030329, optical position
  31. GRB 030329 VLBA Observations
  32. IPN triangulation of GRB030406 (small error box)
  33. IPN triangulation of GRB050403 (small error box)
  34. IPN triangulation of GRB030403 (annulus)
  35. GRB 030329: BVRI photometry at Asiago
  36. GRB 030329, light curve flattens
  37. GRB 030329: VLT V-band photometry
  38. If the SN/GRB connection confirmed
  39. GRB 030329: Supernova Confirmed
  40. GRB030329: RTT150 optical observations
  41. GRB030329: Near Infrared Observations at Gunma
  42. GRB030329: HET spectroscopic monitoring
  43. Kiso observation of the GRB030329 at April 6
  44. GRB 030329, color evolution
  45. GRB030328, UBVRcIc field photometry
  46. GRB 030329 Optical observations
  47. GRB 030329, color evolution
  48. GRB 030329: possible color change
  49. GRB030329: RTT150 optical observations
  50. GRB 030329: Supernova Spectrum Emerging
  51. GRB030329: Kiso B and R band observations
  52. GRB030329: RTT150 optical observation
  53. GRB030329: More AAVSO VR obs
  54. GRB030328: R upper limit after 6 hours by MASTER
  55. GRB 030329: BV photographic observations
  56. GRB 030329: SARA Optical Observations
  57. GRB 030329: SARA Optical Observations
  58. GRB030329, fading resumes
  59. GRB 030329, BVRI photometry
  60. SDSS 0.5m PT observations of GRB030329 (correction)
  61. SDSS 0.5m PT observations of GRB030329
  62. GRB 030329, Optical observations
  63. GRB 030329, nearby galaxies
  64. GRB030329, cessation of fading
  65. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  66. GRB 030329: Sub-millimeter detection
  67. GRB 030329: SARA Optical Observations
  68. GRB 030329: SARA Optical Observations
  69. OT GRB light curves and SN predictions
  70. GRB030329, optical observation
  71. GRB030329, new UBVRcIc field photometry
  72. GRB 030329, light curve and SN prediction
  73. GRB030329: optical observations at Tokyo Tech
  74. GRB 030329: optical observations
  75. GRB030329: multiple re-brightening phases
  76. GRB 030329, BRI photometry
  77. GRB 030329 , SPM optical observations
  78. GRB 030329: Radio observations at GMRT
  79. Further AAVSO V,B,R observations of GRB030329
  80. GRB 030329: Additional Mt. Laguna Optical Observations
  81. GRB 030329: SARA Optical Observations
  82. GRB 030329: Observations with ANDICAM
  83. GRB030329: further optical photometry and evidence for a light curve discontinuity
  84. GRB 030329: Correction to GCN 2056
  85. GRB 030329: fitting parameters and re-brightening
  86. GRB 030329: KAIT optical photometry
  87. GRB030329 Further RBO Optical Observations
  88. triangulation of GRB 030331 (single error box)
  89. GRB030329 - OT rebrightens
  90. GRB 030329: SARA Optical Observations
  91. AAVSO V & R observations of GRB030329
  92. IPN triangulation of GRB030331 (annulus)
  93. GRB 030329: optical observations
  94. IPN triangulation of GRB030329b (large error box)
  95. GRB 030329: beginning of the new fading phase in optical band
  96. GRB 030329, optical spectroscopy
  97. GRB 030329: fading X-ray afterglow with RXTE
  98. GRB 030329: optical photometry
  99. Photometry of GRB030329 - Constant OT Magnitude
  100. GRB 030329, R-band observations

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