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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"

26360 results found.

  1. MASTER:optical observations probable GRB030414
  2. GRB030418: Kiso near infrared observations
  3. GRB 030418: Optical afterglow
  4. OT GRB 030329: early UBVRcIc spectral evolution
  5. OT GRB 030329: early spectrum
  6. IPN triangulation of GRB030414 (small error box)
  7. IPN triangulation of GRB030413 (small error box)
  8. Superluminal motion in GRB 030329 (Correction)
  9. Superluminal motion in GRB 030329
  10. GRB030329, optical position
  11. IPN triangulation of GRB030406 (small error box)
  12. IPN triangulation of GRB050403 (small error box)
  13. GRB 030329: BVRI photometry at Asiago
  14. GRB 030329: VLT V-band photometry
  15. Kiso observation of the GRB030329 at April 6
  16. GRB 030329, color evolution
  17. GRB030328, UBVRcIc field photometry
  18. GRB 030329 Optical observations
  19. GRB030329: Kiso B and R band observations
  20. GRB030328: R upper limit after 6 hours by MASTER
  21. SDSS 0.5m PT observations of GRB030329 (correction)
  22. SDSS 0.5m PT observations of GRB030329
  23. GRB030329: final R-band light curve by MASTER
  24. GRB030329, optical observation
  25. GRB030329, new UBVRcIc field photometry
  26. GRB 030329, light curve and SN prediction
  27. GRB 030329, BRI photometry
  28. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  29. GRB030329: Optical observations at Teramo
  30. GRB 030329: Radio observations at GMRT
  31. Further AAVSO V,B,R observations of GRB030329
  32. GRB 030329: Additional Mt. Laguna Optical Observations
  33. GRB 030329: Observations with ANDICAM
  34. GRB030329: further optical photometry and evidence for a light curve discontinuity
  35. triangulation of GRB 030331 (single error box)
  36. GRB 030329: optical observations
  37. Photometry of GRB030329 - Constant OT Magnitude
  38. GRB030329 - OT brightens
  39. GRB 030329, optical photometry
  40. GRB 030324: Optical and NIR Observations
  41. GRB030329: R band light curve by MASTER
  42. GRB030329 - Light curve flattening
  43. GRB 030324, optical search
  44. GRB 030329, optical observations
  45. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  46. GRB030329a: detection by Konus-Wind
  47. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  48. GRB030329, BVRcIc field photometry
  49. GRB030329, SPM optical observations
  50. GRB 030329: Optical decay and synthesis
  51. GRB030329 optical observations
  52. GRB 030329: Optical pre-Imaging
  53. GRB 030329: Upper limit from 5.6 hours before trigger
  54. GRB030328: X-ray Afterglow Observed with Chandra
  55. GRB 030329, R-band observations
  56. GRB 030329: OT B and R photometry, decline rate
  57. GRB030329: Upper limits from recent and historical observations.
  58. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  59. GRB 030329: Optical Afterglow Observations
  60. GRB 030328: optical observations
  61. GRB 030329: Optical afterglow fading
  62. GRB 030328: OT photometry
  63. GRB030328: optical spectroscopy at TNG
  64. GRB030328: optical photometry at the TNG
  65. VLT spectra of GRB 030328
  66. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  67. GRB 030328: Optical observations
  68. GRB030324 optical observation
  69. GRB030131, BVRcIc field photometry
  70. Possible GRB030323 localized by INTEGRAL
  71. GRB030323: Detection on 2003/03/24
  72. IPN triangulation of GRB030326 (single small error box)
  73. IPN triangulation of GRB030325 (two small error boxes)
  74. GRB030323: V, R, I photometry
  75. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  76. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  77. VLT/FORS2 spectra of GRB 030323
  78. GRB030323, optical observations
  79. GRB030324, BVRcIc field photometry
  80. GRB030323, BVRcIc field calibration
  81. IPN triangulation of GRB030320 (small error box)
  82. Possible GRB 030320 localized by INTEGRAL
  83. IPN triangulation of GRB030306 (single small error box - REVISED)
  84. IPN triangulation of GRB030306 (single small error box)
  85. IPN triangulation of GRB030306 (two small error boxes)
  86. GRB030226, BVRc observations
  87. Chandra detection of the X-ray afterglow of GRB 030226
  88. GRB030227: Kiso optical upper limit
  89. GRB030227, BVRcIc field photometry
  90. GRB030226, BVRcIc field calibration
  91. GRB 030228, optical observations
  92. GRB 030227: Confirmed Optical Afterglow (S1-A)
  93. GRB 030227: fading of candidate optical afterglow 'S1-A'
  94. GRB030227:Optical observations
  95. GRB 030227, possible optical counterpart of XMM-Newton source
  96. GRB030227 - faint tentative OT candidate
  97. GRB 030226, optical observations
  98. XMM-Newton observation of GRB030227
  99. GRB030227: Kiso optical observations
  100. GRB 030227: Kyoto optical observation

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