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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"

26299 results found.

  1. IPN triangulation of GRB030428 (two large error boxes)
  2. GRB 030324: Radio Observations
  3. GRB030329 observed as a sudden ionospheric disturbance (SID)
  4. IPN triangulation of GRB030426 (annulus)
  5. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  6. IPN triangulation of GRB030425 (single error box)
  7. GRB030329, SPM optical observations
  8. IPN triangulation of GRB030422C (annulus)
  9. IPN triangulation of GRB030422B (annulus)
  10. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  11. GRB030329: optical polarization
  12. IPN triangulation of GRB030422 (two large error boxes)
  13. GRB030329, optical observation
  14. IPN triangulation of GRB030421 (annulus)
  15. MASTER:optical observations probable GRB030414
  16. GRB030329: 444 AAVSO Measurements
  17. IPN triangulation of GRB030419 (annulus)
  18. ROTSE-III prompt optical detections of GRB 030418
  19. GRB030418: Upper limits from recent and historical observations.
  20. GRB 030418: Optical afterglow
  21. GRB 030329 OT position
  22. GRB030329: Optical Observations
  23. GRB030329, UBVRI polarimetry, R-polarization
  24. GRB 030329: SARA Optical Observations
  25. OT GRB 030329: early spectrum
  26. GRB030329: VR Photometry at TNG
  27. IPN triangulation of GRB030414 (small error box)
  28. IPN triangulation of GRB030413 (small error box)
  29. IPN triangulation of GRB030410 (annulus)
  30. GRB 030329 and SN 2003dh
  31. GRB030329, optical position
  32. GRB 030329 VLBA Observations
  33. IPN triangulation of GRB030406 (small error box)
  34. IPN triangulation of GRB050403 (small error box)
  35. IPN triangulation of GRB030403 (annulus)
  36. GRB 030329: BVRI photometry at Asiago
  37. GRB 030329, light curve flattens
  38. GRB 030329: Supernova Confirmed
  39. GRB030329: HET spectroscopic monitoring
  40. GRB 030329, color evolution
  41. GRB030329: Optical observcations
  42. GRB030329: BV photographic observations
  43. GRB 030329, color evolution
  44. GRB 030329: possible color change
  45. GRB 030329: Supernova Spectrum Emerging
  46. GRB030329: More AAVSO VR obs
  47. GRB030328: R upper limit after 6 hours by MASTER
  48. GRB 030329: BV photographic observations
  49. GRB 030329: SARA Optical Observations
  50. GRB 030329: SARA Optical Observations
  51. GRB 030329, BVRI photometry
  52. GRB030329: Optical observations
  53. SDSS 0.5m PT observations of GRB030329 (correction)
  54. SDSS 0.5m PT observations of GRB030329
  55. GRB030329, cessation of fading
  56. GRB030329: final R-band light curve by MASTER
  57. GRB 030329: SARA Optical Observations
  58. GRB 030329: SARA Optical Observations
  59. GRB030329, optical observation
  60. GRB030329, optical observation
  61. GRB030329, new UBVRcIc field photometry
  62. GRB 030329, light curve and SN prediction
  63. GRB030329: multiple re-brightening phases
  64. GRB 030329, BRI photometry
  65. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  66. GRB030329: Optical observations at Teramo
  67. Further AAVSO V,B,R observations of GRB030329
  68. GRB 030329: SARA Optical Observations
  69. GRB030329: Optical observations
  70. GRB030329: further optical photometry and evidence for a light curve discontinuity
  71. GRB 030329: fitting parameters and re-brightening
  72. GRB 030329: KAIT optical photometry
  73. GRB030329 Further RBO Optical Observations
  74. triangulation of GRB 030331 (single error box)
  75. GRB030329 - OT rebrightens
  76. GRB 030329: SARA Optical Observations
  77. AAVSO V & R observations of GRB030329
  78. IPN triangulation of GRB030331 (annulus)
  79. GRB 030329: optical observations
  80. IPN triangulation of GRB030329b (large error box)
  81. GRB 030329, optical spectroscopy
  82. GRB 030329: fading X-ray afterglow with RXTE
  83. GRB030329: Optical observations
  84. GRB 030329, R-band light curve
  85. GRB030329 - OT brightens
  86. GRB 030329: OT observations at Kanazawa
  87. GRB 030329 RBO V Optical Observations
  88. GRB 030329, optical photometry
  89. 030331 NOT A GRB
  90. GRB 030328, optical photometry
  91. GRB030329: R band light curve by MASTER
  92. GRB030329 - Light curve flattening
  93. GRB 030329: SARA Optical Observations
  94. GRB030329 - near contemporaneous optical limits from CONCAM
  95. GRB030329: R and B observations
  96. GRB 030329, optical observations
  97. GRB030329: Optical observations
  98. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  99. GRB030329a: detection by Konus-Wind
  100. GRB030329b: detection by Konus-Wind and Helicon-CoronasF

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