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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"

32693 results found.

  1. GRB 050315 I-band observations
  2. GRB050315: Radio afterglow
  3. GRB 050315: Absorption redshift
  4. GRB 050315: Optical afterglow identification
  5. GRB050315: Swift-BAT Refined analysis
  6. Non-detection of GRB050315 in ATCA Radio Observations
  7. GRB 050315: Swift XRT Position
  8. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  9. GRB 050315: Early Observations with Swift/UVOT
  10. GRB050223: No XMM-Newton OM detection of afterglow emission
  11. GRB 050306: Radio Observations
  12. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  13. GRB 050306: optical afterglow
  14. Swift-BAT trigger 107873: No Swift XRT counterpart
  15. GRB 050306: Confirmation of X-ray afterglow
  16. GRB 050309, Early optical limits from RAPTOR
  17. GRB050309: Early optical limit from P60
  18. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  19. GRB 050306: CORRECTION to date of observation
  20. GRB 050306: R-band observations
  21. GRB 050306: No Swift UVOT Optical Counterpart Detected
  22. GRB 050306: REM optical-infrared observations
  23. GRB 050306: Possible X-ray Afterglow Position from the Swift
  24. GRB 050306,optical observation
  25. GRB050215B: Late-Time Swift UVOT Observations
  26. PROMPT VRcIc Observations of GRB 050223
  27. XRF/GRB 050215B: Radio Observations
  28. GRB 050219b: candidate NIR afterglow
  29. GRB 050223: optical observations
  30. GRB050223 XMM-Newton observation
  31. INTEGRAL detection of GRB 050223
  32. GRB050223: No Swift UVOT Detection of Afterglow Emission
  33. GRB050223: ROTSE-III Optical Observations
  34. GRB050219b: CORRECTION to time of UVOT observations
  35. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  36. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  37. GRB 050219b: CORRECTION to refined XRT position
  38. GRB 050219a: Optical observations from LCO
  39. GRB 050219b: Optical and near-IR observations from LCO
  40. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  41. GRB 050219b: CORRECTION: Swift XRT Position
  42. GRB 050219a, optical observations
  43. GRB 050219a: Refined XRT position
  44. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  45. GRB 050219: Swift-BAT detection of a burst
  46. GRB050215b: Swift UVOT Detection of Afterglow Emission
  47. GRB 050215B: Radio Observations
  48. GRB 050215b: XRT confirmation of IR afterglow candidate
  49. GRB050215b: P60 Optical Observations
  50. GRB 050215b: Swift XRT Source Variability
  51. GRB 050215B: candidate afterglow
  52. GRB 050215b : Lulin follow-up observation
  53. GRB 050215b, BOOTES-2 simultaneous optical observations
  54. GRB 050215B: UKIRT K-band imaging
  55. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  56. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  57. GRB 050215b, BOOTES-1B optical limit
  58. GRB050215A: ROTSE-III Optical Observations
  59. GRB050209: TAROT optical observations
  60. short/hard GRB 050202, optical observations
  61. GRB050209: REM optical observations
  62. GRB 050209 I-band observation
  63. GRB050209: P60 Optical Observations
  64. GRB050209 (=U11568): A Long GRB Detected by HETE
  65. GRB 050128: Radio observations
  66. Further analysis of the short Swift-BAT GRB 050202
  67. GRB 050202: Second epoch radio observations
  68. GRB 050129: Optical observations
  69. GRB050202: Radio Observations
  70. GRB 050202: Optical observations with LCO40
  71. GRB 050128 Optical observation with REM
  72. GRB050128: Faulkes Telescope South observations
  73. GRB 050124: Radio Observations
  74. GRB 050128: near-infrared observations with REM
  75. GRB050128,optical observations
  76. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  77. GRB 050126: Radio Observations
  78. GRB050128 Swift-BAT observations
  79. GRB 050128: Swift XRT prompt afterglow position
  80. GRB 050124: K-band afterglow observations
  81. GRB050126: MASTER optical limit for KECK OT
  82. GRB050126: Burst Parameters Measured by BAT
  83. GRB050126: MASTER optical observations
  84. GRB 050126: Detection of NIR afterglow with Keck/NIRC
  85. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  86. GRB050124: No Swift UVOT Detection of Afterglow Emission
  87. GRB 050124, SMARTS optical/IR observations
  88. GRB 050117a: Radio Observations
  89. GRB 050124 I-band observation
  90. GRB 050124: NIR Candidates from Keck/NIRC
  91. GRB050124,optical observation
  92. GRB 050124 : Lulin R-band follow-up observation
  93. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  94. GRB050124: Refined BAT position, spectral and fluence information
  95. GRB 050123 : I-band follow-up observation
  96. GRB050123: optical limit 1.8h before GRB
  97. GRB 050123: KAIT observations
  98. GRB050123: P60 Observations
  99. CFHTLS optical transient unlikely to be a GRB
  100. GRB050117a: Radio Observations

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