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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"

28070 results found.

  1. GRB030115: TAROT optical observations
  2. GRB 030115, no optical candidate
  3. IPN triangulation of GRB030101 (two large error boxes)
  4. GRB021211: Measurement of Early Time Afterglow
  5. GRB021204: Kiso Observations
  6. GRB 021211, R- and I-band observations
  7. GRB021211, OT at 108 s
  8. HETE 2493: Optical observations
  9. HETE 2493: Optical candidate
  10. GRB 021204: Optical Observations at RIKEN
  11. GRB 021201: BOOTES simultaneous optical observations
  12. GRB 021112: RAPTOR Observations
  13. GRB021104: Optical Observations
  14. SGR1900+14 activity, November 2-4, 2002
  15. GRB021104: possible optical afterglow
  16. GRB 021016, optical observations
  17. GRB 021004: VRI observations at TNG: possible break
  18. GRB 021008, optical observations
  19. IPN triangulation of GRB021014 (large error box)
  20. GRB 021004: Additional V-band Polarimetric Observations
  21. GRB 021004: V-band Polarimetric Observations
  22. GRB 021004: Optical observations at RIKEN
  23. GRB 021004, SPM optical observations
  24. GRB021004: optical observations at Nyrola
  25. GRB021004: Optical Afterglow
  26. GRB 020903: Optical observations at RIKEN
  27. XRF 020903: Supernova
  28. IPN triangulation of GRB020914
  29. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  30. INTEGRAL GRBs added to GCN
  31. GRB020812: optical observation
  32. Second epoch K band imaging of GRB 020819
  33. K band observation of GRB 020819
  34. HETE 2275: Optical observations
  35. Polarimetry of GRB020813: evidence for variability
  36. GRB020812: optical observations
  37. GRB020813: Early Time Magnitude
  38. GRB020813, optical observations
  39. Early Time Limits for GRB020813
  40. GRB 020813 Afterglow Observations; Possible break
  41. GRB 020813 multiband optical observations
  42. GRB020813: optical afterglow
  43. GRB020813: Fading of Candidate OT
  44. GRB020813: Candidate Optical Afterglow
  45. GRB 020812 optical observation
  46. GRB020801, optical afterglow candidate
  47. GRB020625 (=H2081): A Long Burst Localized by HETE
  48. HETE #2081: Optical observations
  49. GRB 020531, simultaneous optical observations
  50. GRB020321 : Optical observations.
  51. GRB 020410, optical observations
  52. GRB 020331: Candidate Optical Afterglow
  53. GRB 020322: BeppoSAX observations of the X-ray afterglow
  54. SN 2002ap - peak brightness date (SN/GRB?)
  55. GRB020321: a faint BeppoSAX detection
  56. GRB020317, optical observations
  57. GRB020305, optical observations
  58. GRB020124, optical observations
  59. HETE 1896: Optical observations
  60. GRB011130 (=XRF011130), Optical Observations
  61. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE
  62. GRB 011030: K-band observations
  63. The X-ray Flash 011030 ('GRB 011030')
  64. GRB 011019 optical observation
  65. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  66. GRB 010921: The afterglow of HETE #1761
  67. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  68. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  69. GRB010921 Optical Observations
  70. HETE Trigger #1760 (GRB 010920B?): new optical source = asteroid
  71. HETE Trigger #1760 (GRB 010920B?): a new optical source
  72. HETE Trigger #1759 (GRB 010920?) optical observations
  73. BeppoSAX/GRBM detection of GRB 010801
  74. GCN and HETE status
  75. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  76. GRB 010629 Optical Observations
  77. IPN triangulation of GRB010613
  78. IPN triangulation of GRB010612
  79. GRB010518: a faint BeppoSAX detection
  80. GRB010324: BeppoSAX/GRBM data
  81. GRB 010214: X-Ray afterglow
  82. GRB010213, optical observations
  83. GRB010126: CONCAM crude optical limits during GRB
  84. HETE positions added to GCN
  85. CONCAM null result on GRB001005
  86. CONCAM crude optical limits before and after GRB000926
  87. GRB000607, optical observations
  88. GRB 000615: NIR observations
  89. IPN triangulation of GRB000519
  90. RXTE/ASM and IPN localization of GRB 000508B
  91. BeppoSAX GRB000424
  92. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  93. GRB000408, lotis optical observations
  94. GRB 000313 - optical transient in the BATSE error box
  95. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  96. BATSE GRB trigger criterion changed
  97. GRB000210 X-ray afterglow
  98. GRB 000210: BATSE Observations
  99. GRB000201 Optical Observations
  100. GRB 000201: TAROT optical observations

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