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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"

27405 results found.

  1. GRB 030329: optical observations
  2. GRB 030329, R-band observations
  3. RXTE detection of GRB 030329 afterglow
  4. GRB 030329: Optical Afterglow Observations
  5. GRB 030328: Optical observations
  6. GRB 030328: optical observations
  7. GRB 030329: OT candidate
  8. VLT spectra of GRB 030328
  9. GRB030324 optical observation
  10. GRB030324, optical observations
  11. GRB030324, optical observations
  12. GRB 030324: TAROT optical observations
  13. GRB 030324 (HETE #2641): Optical observations
  14. GRB030324, Optical Observations
  15. VLT/FORS2 spectra of GRB 030323
  16. GRB030323, ROTSE-III detection of possible optical counterpart
  17. GRB030323, optical observations
  18. GRB030324, BVRcIc field photometry
  19. GRB030323, possible optical counterpart
  20. GRB030323, BVRcIc field calibration
  21. GRB 030324 optical observations
  22. GRB 030324, optical observations
  23. GRB 030227: Optical limit at RIKEN
  24. Chandra detection of the X-ray afterglow of GRB 030226
  25. 030302: NOT A GRB
  26. 030228: NOT A GRB
  27. GRB 030228, optical observations
  28. GRB 030226: R band polarimetric observations
  29. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  30. GRB 030226 simultaneous optical observations
  31. GRB030226: Candidate optical afterglow
  32. IPN triangulation of GRB030215C (annulus)
  33. GRB 030115, simultaneous observations by BOOTES-1
  34. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  35. Distribution of INTEGRAL SPI-ACS triggers
  36. GRB030115: TAROT optical observations
  37. GRB 030115, no optical candidate
  38. IPN triangulation of GRB030101 (two large error boxes)
  39. GRB021211: Measurement of Early Time Afterglow
  40. GRB021204: Kiso Observations
  41. GRB 021211, R- and I-band observations
  42. GRB021211, OT at 108 s
  43. HETE 2493: Optical observations
  44. HETE 2493: Optical candidate
  45. GRB 021204: Optical Observations at RIKEN
  46. GRB 021201: BOOTES simultaneous optical observations
  47. GRB 021112: RAPTOR Observations
  48. GRB021104: Optical Observations
  49. SGR1900+14 activity, November 2-4, 2002
  50. GRB021104: possible optical afterglow
  51. GRB 021016, optical observations
  52. GRB 021004: VRI observations at TNG: possible break
  53. GRB 021008, optical observations
  54. IPN triangulation of GRB021014 (large error box)
  55. GRB 021004: Additional V-band Polarimetric Observations
  56. GRB 021004: V-band Polarimetric Observations
  57. GRB 021004: Optical observations at RIKEN
  58. GRB 021004, SPM optical observations
  59. GRB021004: optical observations at Nyrola
  60. GRB021004: Optical Afterglow
  61. GRB 020903: Optical observations at RIKEN
  62. XRF 020903: Supernova
  63. IPN triangulation of GRB020914
  64. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  65. INTEGRAL GRBs added to GCN
  66. GRB020812: optical observation
  67. Second epoch K band imaging of GRB 020819
  68. K band observation of GRB 020819
  69. HETE 2275: Optical observations
  70. Polarimetry of GRB020813: evidence for variability
  71. GRB020812: optical observations
  72. GRB020813: Early Time Magnitude
  73. GRB020813, optical observations
  74. Early Time Limits for GRB020813
  75. GRB 020813 Afterglow Observations; Possible break
  76. GRB 020813 multiband optical observations
  77. GRB020813: optical afterglow
  78. GRB020813: Fading of Candidate OT
  79. GRB020813: Candidate Optical Afterglow
  80. GRB 020812 optical observation
  81. GRB020801, optical afterglow candidate
  82. GRB020625 (=H2081): A Long Burst Localized by HETE
  83. HETE #2081: Optical observations
  84. GRB 020531, simultaneous optical observations
  85. GRB020321 : Optical observations.
  86. GRB 020410, optical observations
  87. GRB 020331: Candidate Optical Afterglow
  88. GRB 020322: BeppoSAX observations of the X-ray afterglow
  89. SN 2002ap - peak brightness date (SN/GRB?)
  90. GRB020321: a faint BeppoSAX detection
  91. GRB020317, optical observations
  92. GRB020305, optical observations
  93. GRB020124, optical observations
  94. HETE 1896: Optical observations
  95. GRB011130 (=XRF011130), Optical Observations
  96. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE
  97. GRB 011030: K-band observations
  98. The X-ray Flash 011030 ('GRB 011030')
  99. GRB 011019 optical observation
  100. Optical observation of SGR 1806-20 at the 6-m SAO telescope

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