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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"

32763 results found.

  1. GRB 050813: Magellan detection of a high redshift galaxy cluster
  2. GRB050813: RTT150 optical observations
  3. GRB 050813: I-band observations
  4. GRB050813, SDSS pre-burst observations
  5. GRB 050813: KAIT optical limit
  6. GRB 050813: Swift-BAT refined analysis
  7. GRB 050813: Photometry of object in XRT error circle
  8. GRB050813: SWIFT/UVOT observation
  9. GRB 050813: Swift XRT afterglow localization
  10. RBO GRB 050714A and GRB 050716 observations
  11. Swift-BAT trigger 150131 is not a GRB
  12. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  13. GRB050803: CrAO optical observations, no OT candidate
  14. GRB 050730: WSRT Radio Observations
  15. GRB 050803: PROMPT BVRcIc Observations
  16. GRB 050807: ROTSE-III Optical Limits
  17. GRB 050730, optical observation
  18. GRB050805a : Null detection report
  19. GRB050730, optical observations
  20. GRB050803, optical observations
  21. GRB 050805b: TAROT optical limits
  22. GRB050802: TNG optical observations
  23. GRB050803: Radio Observation
  24. GRB 050803: RTT150 optical observations
  25. GRB050801: Radio Observation
  26. GRB050730: Radio Detection
  27. GRB050803: CrAO optical observations, possible OT candidate
  28. GRB050803: Optical/UV Upper Limits from Swift-UVOT
  29. GRB 050803: Keck Observations
  30. GRB 050803: Swift-BAT refined analysis
  31. GRB 050802.422: Fading of the afterglow and detection of the host
  32. GRB050803: MASTER further analys
  33. GRB 050803, optical observations
  34. GRB 050803: Magellan Observations
  35. GRB 050803: early Swift XRT analysis results
  36. GRB050802: Tentative absorption redshift
  37. GCN GRB observation 050713A
  38. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  39. GRB 050802: Swift/UVOT optical and UV detections
  40. GRB050802: CrAO optical observations
  41. GRB050801: Unchanged decay slope
  42. GRB050802 radio non-detection
  43. GRB 050802: early Swift XRT analysis results
  44. GRB 050802: Swift/UVOT observations
  45. GRB 050802: Swift-BAT refined analysis
  46. GRB050801: Optical photometry and decay index
  47. GRB 050802: XRT position
  48. GRB 050802: Swift Gamma-ray Burst
  49. GRB050801: Swift/UVOT Optical and UV detections
  50. GCN 050801: early Swift XRT analysis results
  51. GRB 050801: Swift-BAT refined analysis
  52. GRB 050801, SMARTS optical/IR afterglow observations
  53. GRB 050801, afterglow observations
  54. GRB 050730, corrected photometry and break?
  55. GRB 050801: ROTSE-III Early Afterglow Break
  56. GRB050801: Swift-BAT detection of a burst
  57. GRB050801: GCN XRT position is incorrect
  58. GRB 050801: ROTSE-III Detection of Possible Counterpart
  59. GRB 050730: XRT refined analysis
  60. Correction to GCN Circ 3476 on GRB050525A
  61. GRB 050730: early TAROT optical observations
  62. GRB 050726: PROMPT Rc Observations
  63. GRB 050730: RTT150 optical observations
  64. Swift/UVOT photometry of GRB050730
  65. GRB 050730, spectra and optical photometry
  66. GRB050730: Refined BAT analysis of the Swift-BAT burst
  67. GRB 050730: Swift XRT afterglow observations
  68. GRB 050730 XMM-Newton observation
  69. GRB 050730: PROMPT VRcIc Observations
  70. GRB050730, afterglow observations
  71. GRB050730: confirmation of redshift
  72. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  73. GRB 050730, SMARTS optical/IR afterglow observations
  74. GRB050730: Liverpool Telescope optical observations
  75. GRB 050709: PROMPT Rc Observations
  76. GRB050713b: Maidanak optical observations
  77. GRB 050724: Secure Host Redshift from Keck
  78. GRB 050724: WHT optical observations
  79. GRB050726: Swift UVOT observations
  80. GRB 050724: Chandra Observations of the X-ray Afterglow
  81. GRB050724: Refined Radio Position
  82. GRB050713: analysis of the XMM-Newton observation
  83. GRB 050724, SMARTS optical/IR afterglow observations
  84. GRB 050726, SMARTS optical/IR observations
  85. Swift-BAT trigger 147918 is not a real GRB
  86. GRB050724: VLT observations of the variable source
  87. GRB050709: Second Epoch Chandra Observation
  88. GRB 050726: PROMPT Rc Observations
  89. GRB050709: Second Epoch Chandra Observation
  90. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  91. GRB050724: Further Radio Observations
  92. GRB 050726: early Swift XRT analysis results
  93. GRB050726: Swift-BAT detection of a weak burst
  94. GRB 050724: Optical Variability in Nearby Galaxy
  95. GRB 050724: J-band observations
  96. GRB 050724: GMOS Imaging and Spectroscopy
  97. GRB 050724: SWIFT XRT refined position
  98. RXTE ASM Detection of GRB050724
  99. GRB050724: Radio Observation
  100. GRB 050724: spectroscopy of object in the XRT error circle

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