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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"

21049 results found.

  1. GRB030329 optical observations
  2. GRB030329: optical spectroscopy with the TNG
  3. GRB 030329: Radio Observations
  4. GRB 030329, optical spectroscopy
  5. GRB 030329: still bright
  6. GRB 030329: visual observations
  7. GRB 030329: Upper limit from 5.6 hours before trigger
  8. GRB030328: X-ray Afterglow Observed with Chandra
  9. GRB030329: Optical observations
  10. GRB 030329, R-band observations, supplement
  11. GRB030329 optical observations
  12. GRB030329:optical observations by MASTER
  13. GRB 030329: optical observations
  14. GRB 030329, R-band observations
  15. GRB030329: Upper limits from recent and historical observations.
  16. GRB 030329: Optical Afterglow Observations
  17. GRB 030328 Optical Observations
  18. GRB030328: Decay index
  19. GRB 030328: Optical observations
  20. GRB 030328: optical observations
  21. GRB 030329: Optical afterglow fading
  22. GRB 030329 follow-up
  23. GRB 030329: Optical afterglow candidate
  24. GRB 030328: OT photometry
  25. GRB030328: optical spectroscopy at TNG
  26. GRB030328: optical photometry at the TNG
  27. GRB 030328, optical spectroscopy
  28. GRB 030328, optical observations
  29. GRB 030328: Optical observations
  30. GRB 030328: Optical afterglow candidate
  31. GRB030323 optical observations
  32. GRB 030323: SARA Optical Observations
  33. GRB030324, optical observations
  34. GRB030324, optical observations
  35. GRB 030324: TAROT optical observations
  36. GRB030323: V, R, I photometry
  37. GRB 030324 (HETE #2641): Optical observations
  38. GRB030324, Optical Observations
  39. GRB030323: Upper limits from recent and historical observations.
  40. GRB030323, optical observations
  41. GRB030324, BVRcIc field photometry
  42. GRB030323, possible optical counterpart
  43. GRB030323, BVRcIc field calibration
  44. GRB 030324 optical observations
  45. GRB 030320: Optical Observations
  46. GRB 030324, optical observations
  47. GRB030226, addendum to GCN 1892
  48. GRB 030226 Optical observations
  49. GRB030226: Optical observations at Asiago
  50. GRB 030226: Optical observations
  51. GRB 030227: Optical observations
  52. GRB030226, BVRc observations
  53. GRB 030226, further optical/NIR imaging
  54. GRB030227, optical observations
  55. GRB 030226: Ic Observations
  56. GRB 030228, optical observations
  57. GRB 030226: Steep Decline
  58. GRB 030227: Confirmed Optical Afterglow (S1-A)
  59. GRB 030226: R band polarimetric observations
  60. GRB 030226: Optical observations
  61. GRB030227:Optical observations
  62. GRB 20030226: Upper limits from recent and historical observations
  63. GRB 030227, possible optical counterpart of XMM-Newton source
  64. GRB 030226, optical observations
  65. GRB030227: Kiso optical observations
  66. GRB 030226, optical light curve
  67. GRB030226: optical observation
  68. GRB030226: ESI spectroscopy
  69. GRB 030226 simultaneous optical observations
  70. GRB 030226, optical observations
  71. GRB030226: optical observations and refined redshift
  72. GRB030226: Optical decay index
  73. GRB 030226, optical observations
  74. GRB030226: Candidate optical afterglow
  75. GRB 030217: Optical Observations at 4, 5, and 6 Days
  76. GRB030217: optical observations
  77. GRB030115, WSRT radio observations - correction to GCN 1864
  78. GRB 030131: marginal optical detection
  79. GRB030115, WSRT radio observations
  80. GRB 030204: Optical Observations
  81. GRB020819: Kiso R and I band observations
  82. GRB030131: Candidate Optical Afterglow
  83. GRB 030115: Optical Observations
  84. GRB 030204, optical observations
  85. GRB 030131, optical observations
  86. GRB030131: Optical limits for corrected position
  87. GRB 030115, late-time optical observations
  88. GRB030131: Kiso Observations
  89. GRB 020819: Host galaxy at Radio Position
  90. GRB 020819: afterglow candidate
  91. GRB030131: Optical limit
  92. GRB 030131 optical observations
  93. GRB 030131 optical observations
  94. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  95. Type Ic SN2003L (SN/GRB?) Radio Observations
  96. GRB030115 submm upper limit
  97. GRB 030115: Further IR observations with IRSF/SIRIUS
  98. GRB 030115: Radio detection of IR candidate
  99. GRB 030115, simultaneous observations by BOOTES-1
  100. GRB 030115: IR observations with IRSF/SIRIUS

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
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