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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"

43855 results found.

  1. GRB 050603: Analysis of UVOT data
  2. GRB050603: Fading Afterglow observed by Swift UVOT
  3. GRB050603, submillimetre observations
  4. GRB 050603: Swift XRT Position
  5. GRB050603: Radio Detection
  6. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  7. GRB 050603: Afterglow Identification from LCO
  8. GRB 050603: INTEGRAL shows it is not a short GRB
  9. Swift/BAT Detection of GRB050603
  10. GRB 050408: jet break in the XRT light curve
  11. GRB 050525a, infrared observations
  12. GRB 050525a, SMARTS optical/IR afterglow observations
  13. GRB050528, XRT observations
  14. GRB050528: updated Liverpool Telescope limits
  15. Swift-BAT GRB 050528: a soft burst
  16. Update on Swift-BAT GRB 050528 (Trigger 130679)
  17. GRB050528: BOOTES optical candidate (retraction)
  18. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  19. GRB050528: BOOTES optical candidate
  20. Possible GRB050528: no candidate from Liverpool Telescope
  21. Swift-BAT detection of possible GRB 050528
  22. GRB050525a: Radio Observations
  23. GRB 050509b: refined XRT/Chandra afterglow position analysis
  24. GRB 050525: RTT150, Optical observations
  25. GRB050525a: optical upper limits
  26. GRB 050525a: SARA Observations
  27. GRB 050525B: Swift-BAT observations
  28. GRB 050525: MITSuME Optical Observation in VRI
  29. GRB 050525a: MDM Observations
  30. GRB050525A,optical observation
  31. GRB050525: Super-LOTIS observations
  32. GRB 050525, spectral lag pseudo-redshift
  33. GRB 050525a: Gemini/GMOS Spectra
  34. GRB050306: optical afterglow not confirmed
  35. GRB 050525A: BOOTES simultaneous optical observations
  36. GRB 050525A: Swift-BAT refined analysis
  37. GRB050525: Optical observations
  38. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  39. GRB 050525: pseudo-redshift
  40. Swift/UVOT UV and optical detections of GRB 050525
  41. Konus-Wind observation of GRB 050525
  42. GRB 050525: TAROT observations of the early afterglow
  43. INTEGRAL detection of GRB 050525
  44. GRB 050525, infrared observations
  45. GRB 050525: Optical observation
  46. GRB 050525: observatons of the optical afterglow
  47. GRB050525: ROTSE-III Refined Analysis
  48. GRB 050525 - Very Bright, Not Short
  49. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  50. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  51. XRF050522: NIR observations of XRT candidate
  52. XRF 050522: Swift XRT refined analysis
  53. XRF050522: Radio Observations
  54. Swift/UVOT observation of XRF 050522
  55. GRB 050509A: Further I-band imaging
  56. GRB050522,optical observation
  57. GRB050520,optical observation
  58. XRF 050522: Continued NIR P200 Monitoring
  59. RBO Observations of GRB050522
  60. Recent GRB BVRcIc field photometry
  61. GRB050520: Radio Observations
  62. XRF 050522: Swift XRT observation
  63. XRF050522, BVRcIc field photometry
  64. XRF050522: Optical Observations
  65. XRF050522: Near-infrared Observations
  66. XRF 050522: KAIT observations
  67. XRF 050522 detected with INTEGRAL
  68. GRB 050520: VLT/ULTRACAM observations
  69. Swift UVOT Observations of GRB 050520
  70. GRB 050520: Swift XRT refined analysis
  71. XRF050509C: Chandra Afterglow Detection
  72. XRF 050509c: Swift XRT Upper Limit
  73. XRF050509c: Radio Observations
  74. RBO Observations of GRB050520
  75. GRB 050520: P200 Observations
  76. GRB050520: Liverpool Telescope follow-up
  77. RBO Observations of GRB050520
  78. GRB 050520: TAROT optical limit
  79. GRB 050520: Swift XRT position
  80. GRB 050520: VLT/ULTRACAM observations
  81. GRB 050520: OSN optical observations
  82. GRB 050520 - A long GRB detected with INTEGRAL
  83. No Swift-BAT Lightcurves in real-time for next 3 weeks
  84. Swift-BAT trigger 122203 is not a real GRB
  85. XRF 050509C: REM NIR and Optical refined analysis
  86. GRB 050504: Swift XRT afterglow candidate has faded
  87. XRF 050509c optical afterglow
  88. GRB 050509B and short GRB-SN association? (corrected)
  89. GRB 050509B and short GRB-SN association?
  90. GRB050502b: Early Observation
  91. GRB050509b, Bok telescope B-band imaging
  92. Refined Chandra analysis of GRB 050509b
  93. GRB050509b, SDSS pre-burst observations
  94. GRB 050509b: Keck/Chandra Cross-Correlation
  95. GRB 050509b: Keck/Chandra Cross-Correlation
  96. Chandra observation of GRB 050509b
  97. GRB 050509b: RAPTOR deep, early limits.
  98. GRB050509B: Optical/Infared observations
  99. GRB 050509b: Swift/UVOT follow-up measurements
  100. GRB 050509b Milagro GeV/TeV Observations

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