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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

28258 results found.

  1. GRB 030418: Optical afterglow
  2. OT GRB 030329: early UBVRcIc spectral evolution
  3. OT GRB 030329: early spectrum
  4. IPN triangulation of GRB030414 (small error box)
  5. IPN triangulation of GRB030413 (small error box)
  6. Superluminal motion in GRB 030329 (Correction)
  7. Superluminal motion in GRB 030329
  8. GRB030329, optical position
  9. IPN triangulation of GRB030406 (small error box)
  10. IPN triangulation of GRB050403 (small error box)
  11. GRB 030329: BVRI photometry at Asiago
  12. GRB 030329: VLT V-band photometry
  13. Kiso observation of the GRB030329 at April 6
  14. GRB 030329, color evolution
  15. GRB030328, UBVRcIc field photometry
  16. GRB 030329 Optical observations
  17. GRB030329: Kiso B and R band observations
  18. GRB030328: R upper limit after 6 hours by MASTER
  19. SDSS 0.5m PT observations of GRB030329 (correction)
  20. SDSS 0.5m PT observations of GRB030329
  21. GRB030329: final R-band light curve by MASTER
  22. GRB030329, optical observation
  23. GRB030329, new UBVRcIc field photometry
  24. GRB 030329, light curve and SN prediction
  25. GRB 030329, BRI photometry
  26. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  27. GRB030329: Optical observations at Teramo
  28. GRB 030329: Radio observations at GMRT
  29. Further AAVSO V,B,R observations of GRB030329
  30. GRB 030329: Additional Mt. Laguna Optical Observations
  31. GRB 030329: Observations with ANDICAM
  32. GRB030329: further optical photometry and evidence for a light curve discontinuity
  33. triangulation of GRB 030331 (single error box)
  34. GRB 030329: optical observations
  35. Photometry of GRB030329 - Constant OT Magnitude
  36. GRB030329 - OT brightens
  37. GRB 030329, optical photometry
  38. GRB 030324: Optical and NIR Observations
  39. GRB030329: R band light curve by MASTER
  40. GRB030329 - Light curve flattening
  41. GRB 030324, optical search
  42. GRB 030329, optical observations
  43. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  44. GRB030329a: detection by Konus-Wind
  45. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  46. GRB030329, BVRcIc field photometry
  47. GRB030329, SPM optical observations
  48. GRB 030329: Optical decay and synthesis
  49. GRB030329 optical observations
  50. GRB 030329: Optical pre-Imaging
  51. GRB 030329: Upper limit from 5.6 hours before trigger
  52. GRB030328: X-ray Afterglow Observed with Chandra
  53. GRB 030329, R-band observations
  54. GRB 030329: OT B and R photometry, decline rate
  55. GRB030329: Upper limits from recent and historical observations.
  56. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  57. GRB 030329: Optical Afterglow Observations
  58. GRB 030328: optical observations
  59. GRB 030329: Optical afterglow fading
  60. GRB 030328: OT photometry
  61. GRB030328: optical spectroscopy at TNG
  62. GRB030328: optical photometry at the TNG
  63. VLT spectra of GRB 030328
  64. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  65. GRB 030328: Optical observations
  66. GRB030324 optical observation
  67. GRB030131, BVRcIc field photometry
  68. Possible GRB030323 localized by INTEGRAL
  69. GRB030323: Detection on 2003/03/24
  70. IPN triangulation of GRB030326 (single small error box)
  71. IPN triangulation of GRB030325 (two small error boxes)
  72. GRB030323: V, R, I photometry
  73. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  74. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  75. VLT/FORS2 spectra of GRB 030323
  76. GRB030323, optical observations
  77. GRB030324, BVRcIc field photometry
  78. GRB030323, BVRcIc field calibration
  79. IPN triangulation of GRB030320 (small error box)
  80. Possible GRB 030320 localized by INTEGRAL
  81. IPN triangulation of GRB030306 (single small error box - REVISED)
  82. IPN triangulation of GRB030306 (single small error box)
  83. IPN triangulation of GRB030306 (two small error boxes)
  84. GRB030226, BVRc observations
  85. Chandra detection of the X-ray afterglow of GRB 030226
  86. GRB030227: Kiso optical upper limit
  87. GRB030227, BVRcIc field photometry
  88. GRB030226, BVRcIc field calibration
  89. GRB 030228, optical observations
  90. GRB 030227: Confirmed Optical Afterglow (S1-A)
  91. GRB 030227: fading of candidate optical afterglow 'S1-A'
  92. GRB030227:Optical observations
  93. GRB 030227, possible optical counterpart of XMM-Newton source
  94. GRB030227 - faint tentative OT candidate
  95. GRB 030226, optical observations
  96. XMM-Newton observation of GRB030227
  97. GRB030227: Kiso optical observations
  98. GRB 030227: Kyoto optical observation
  99. GRB 030226, optical light curve
  100. GRB030227 localized by INTEGRAL

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