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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"

36208 results found.

  1. VLA prompt radio detection of the INTEGRAL burst 071109
  2. GRB 071109: IBIS refined analysis
  3. GRB 071109: BOOTES-2 prompt optical observations
  4. GRB 071109: A long GRB detected by INTEGRAL
  5. GRB 071104: Swift-XRT Team Refined Analysis
  6. GRB 071104: Possible Swift UVOT Afterglow Candidate
  7. GRB 071104: Swift-XRT position
  8. GRB 071104: Gamma Ray Burst Localization by SuperAGILE
  9. GRB071010b: optical observation
  10. Swift XRT and UVOT observations of GRB071028B
  11. GRB 071101, Swift-BAT refined analysis
  12. GRB 071101: Swift-XRT Team refined analysis
  13. GRB071101: Optical and NIR upper limits by KANATA
  14. GRB 071101: TAROT Calern observatory optical observations
  15. GRB 071101: Swift XRT position
  16. GRB071101 LOAO B,V,R,I observation
  17. GRB 071101: BOOTES-2 prompt optical observations
  18. GRB 071101: a nearby galaxy
  19. GRB 071101: Swift detection of a burst
  20. GRB 071031, Swift-BAT refined analysis
  21. GRB 071031: Swift/UVOT detection of afterglow
  22. GRB 071031: Swift-XRT Team refined analysis
  23. GRB 071020: MITSuME Akeno optical observations
  24. GRB 071031: REM NIR and Optical observation
  25. GRB 071031, SMARTS afterglow observations
  26. GRB 071031: VLT high-resolution spectroscopy
  27. GRB071031: Rapid PROMPT Detections
  28. GRB 071031: GROND detection in all bands
  29. GRB 071031: Swift detection of a burst with an optical counterpart
  30. GRB 071028B Swift-BAT detection of a burst
  31. GRB 071028: SARA observations of variable source
  32. Swift UVOT upper limits to GRB071028
  33. GRB 071028: Swift-XRT Team refined analysis
  34. GRB 071028, Swift-BAT refined analysis
  35. GRB 071028: Swift detection of a burst
  36. GRB 071025: Kuiper Telescope Optical Observations
  37. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  38. GRB 071018: Revised BAT position
  39. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  40. GRB 071025: SARA VRI upper limits
  41. GRB 071025 Milagro GeV/TeV Observations
  42. GRB 071025: SQIID JHK photometry
  43. GRB 071025A: Complex Early-Time IR Behavior, Simultaneous with Gamma- and X-rays
  44. Swift UVOT upper limits
  45. GRB 071025: Swift-XRT Team refined analysis
  46. GRB 060602A: host redshift
  47. GRB 071025, Swift-BAT refined analysis
  48. GRB 071025: Early Super-LOTIS Observations
  49. GRB 071025: R/I-band update
  50. GRB071021 : CFHT Ks-band observation
  51. GRB 071025: ROTSE-III Refined Analysis
  52. GRB 071025: I-detection, R-dropout?
  53. GRB 071025: Swift XRT refined position
  54. GRB 071025a: PAIRITEL observations
  55. GRB 071025: ROTSE-III Detection of Optical Counterpart
  56. GRB 071025: Swift detection of a burst
  57. GRB 071021: R-band detection and analysis
  58. GRB 071020: BTA spectroscopy
  59. Possible radio detection of GRB 071021 with the VLA
  60. Optical observations of GRB 071020
  61. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  62. GRB 071020: SARA observations
  63. Radio detection of GRB 071020 with the VLA
  64. GRB071010b: optical observation
  65. GRB 071021: Subaru NIR observation
  66. GRB 071021: Magellan i-band observation
  67. GRB 071021: Magellan R-band observation
  68. GRB 071021: Z-band detection
  69. GRB 071021: correction to GCNC 6968
  70. GRB 071020: Fading slowly?
  71. GRB 071010B: Fading quickly
  72. GRB 071021: optical and NIR observations
  73. GRB 071021: possible high-z burst
  74. GRB 071021, Swift-BAT refined analysis
  75. GRB 071021: retraction of Faulkes Telescope South candidate
  76. GRB 071021: Swift-XRT Team refined analysis
  77. GRB 071021: Xinglong TNT optical Upper Limit
  78. GRB 071021 : Lulin R-band limit
  79. Konus-Wind observation of GRB 071020
  80. GRB 071021: Faulkes Telescope South optical candidate
  81. GRB 071021: Swift detection of a burst
  82. GRB 071010B: Independent Confirmation of Break
  83. GRB 071020: Swift-XRT refined analysis
  84. GRB 071020, Swift-BAT refined analysis
  85. GRB 071020A: IR Imaging with PAIRITEL
  86. GRB 071020: VLT spectroscopy
  87. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  88. GRB071020 - SDSS Pre-burst Observations
  89. GRB 071020: Swift detection of a bright burst
  90. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  91. GRB 071018: Mercator Telescope optical observations
  92. Swift autonomous slewing re-enabled
  93. GRB071010b: optical observations
  94. GRB 071018: SARA observations
  95. GRB 071018: Swift-XRT observation
  96. GRB 071017 - Swift XRT observations
  97. VLA radio observation of GRB 071018
  98. GRB071018: Correction to the GCN 6936
  99. GRB071018: Correction to the GCN 6936
  100. GRB071018: Correction to the GCN 6936

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