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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"

32494 results found.

  1. GRB 030429: confirmation of afterglow candidate
  2. GRB030425: CrAO optical observation
  3. GRB 030329 Oprical observations in Rozhen observatory
  4. GRB 030324: Radio Observations
  5. GRB030329 observed as a sudden ionospheric disturbance (SID)
  6. GRB030329, SPM optical observations
  7. GRB 030329, the review of the sky area in plate archive (1950-1998)
  8. GRB 030329: Spectral Evolution of SN 2003dh
  9. GRB 030329: optical spectropolarimetry at VLT
  10. GRB030329: optical polarization
  11. GRB030329, optical observation
  12. GRB030329: 444 AAVSO Measurements
  13. ROTSE-III prompt optical detections of GRB 030418
  14. GRB030418: Upper limits from recent and historical observations.
  15. GRB 030418: Optical afterglow
  16. GRB 030418: Finder for afterglow candidate
  17. GRB 030329 OT position
  18. GRB030329: Optical Observations
  19. OT GRB 030329: early UBVRcIc spectral evolution
  20. GRB030329, UBVRI polarimetry, R-polarization
  21. GRB 030329: SARA Optical Observations
  22. OT GRB 030329: early spectrum
  23. GRB030329: VR Photometry at TNG
  24. GRB030324: Candidate Optical Afterglow
  25. GRB 030413: Optical Observations
  26. GRB 030329 Rc observations
  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. GRB 030329: BVRI photometry at Asiago
  33. GRB 030329, light curve flattens
  34. GRB 030329: VLT V-band photometry
  35. If the SN/GRB connection confirmed
  36. GRB 030329: Supernova Confirmed
  37. GRB030329: RTT150 optical observations
  38. GRB030329: Near Infrared Observations at Gunma
  39. GRB030329: HET spectroscopic monitoring
  40. GRB 030329, color evolution
  41. GRB030328, UBVRcIc field photometry
  42. GRB030329: Optical observcations
  43. GRB030329: BV photographic observations
  44. GRB 030329 Optical observations
  45. GRB 030329, color evolution
  46. GRB 030329: possible color change
  47. GRB030329: RTT150 optical observations
  48. GRB 030329: Supernova Spectrum Emerging
  49. GRB030329: RTT150 optical observation
  50. GRB030329: More AAVSO VR obs
  51. GRB030328: R upper limit after 6 hours by MASTER
  52. GRB 030329: BV photographic observations
  53. GRB 030329: SARA Optical Observations
  54. GRB 030329: SARA Optical Observations
  55. GRB030329, fading resumes
  56. GRB 030329, BVRI photometry
  57. GRB030329: Optical observations
  58. SDSS 0.5m PT observations of GRB030329 (correction)
  59. SDSS 0.5m PT observations of GRB030329
  60. GRB 030329, Optical observations
  61. GRB 030329, nearby galaxies
  62. GRB030329, cessation of fading
  63. GRB030329: final R-band light curve by MASTER
  64. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  65. GRB 030329: Sub-millimeter detection
  66. GRB 030329: SARA Optical Observations
  67. GRB 030329: SARA Optical Observations
  68. OT GRB light curves and SN predictions
  69. GRB030329, optical observation
  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. GRB030329: Optical observations at Teramo
  78. GRB030329: more 15GHz observations
  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: Optical observations
  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. GRB 030329: optical observations
  93. IPN triangulation of GRB030329b (large error box)
  94. GRB 030329: beginning of the new fading phase in optical band
  95. GRB 030329, optical spectroscopy
  96. GRB 030329: fading X-ray afterglow with RXTE
  97. GRB 030329: optical photometry
  98. GRB030329: Optical observations
  99. Photometry of GRB030329 - Constant OT Magnitude
  100. GRB 030329, R-band light curve

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