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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"

38586 results found.

  1. GRB050607 optical limit by "Pi of the Sky"
  2. GRB050607: Swift Detection of a long GRB
  3. GRB050607: P60 Observations
  4. GRB050607: prompt REM observations
  5. Limits on a SN in the field of GRB 050509b
  6. GRB 050603: Redshift
  7. GRB 050603 - XRT data analysis of the first day
  8. Konus-Wind observation of GRB 050603
  9. GRB 050603: Analysis of UVOT data
  10. GRB050603: Fading Afterglow observed by Swift UVOT
  11. GRB050603, submillimetre observations
  12. GRB 050603: Swift XRT Position
  13. GRB050603: Radio Detection
  14. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  15. GRB 050603: Afterglow Identification from LCO
  16. GRB 050603: INTEGRAL shows it is not a short GRB
  17. Swift/BAT Detection of GRB050603
  18. GRB 050408: jet break in the XRT light curve
  19. GRB 050525a, infrared observations
  20. GRB 050525a, SMARTS optical/IR afterglow observations
  21. GRB050528, XRT observations
  22. Correction to GCN Circ 3502 on GRB 050528
  23. Swift-BAT GRB 050528: a soft burst
  24. Update on Swift-BAT GRB 050528 (Trigger 130679)
  25. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  26. Swift-BAT detection of possible GRB 050528
  27. GRB050525a: Radio Observations
  28. GRB 050509b: refined XRT/Chandra afterglow position analysis
  29. GRB 050525: RTT150, Optical observations
  30. GRB050525a: optical upper limits
  31. GRB 050525a: SARA Observations
  32. GRB 050525B: Swift-BAT observations
  33. GRB 050525: MITSuME Optical Observation in VRI
  34. GRB 050525a: MDM Observations
  35. GRB050525A,optical observation
  36. GRB 050525 : Lulin optical afterglow observations
  37. GRB050525: Super-LOTIS observations
  38. GRB 050525, spectral lag pseudo-redshift
  39. GRB 050525a: Gemini/GMOS Spectra
  40. GRB050306: optical afterglow not confirmed
  41. GRB 050525A: Swift-BAT refined analysis
  42. GRB050525: Optical observations
  43. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  44. Swift/UVOT UV and optical detections of GRB 050525
  45. Konus-Wind observation of GRB 050525
  46. INTEGRAL detection of GRB 050525
  47. GRB 050525, infrared observations
  48. GRB 050525: observatons of the optical afterglow
  49. GRB050525: ROTSE-III Refined Analysis
  50. GRB 050525 - Very Bright, Not Short
  51. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  52. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  53. XRF050522: NIR observations of XRT candidate
  54. XRF 050522: Swift XRT refined analysis
  55. XRF050522: Radio Observations
  56. Swift/UVOT observation of XRF 050522
  57. GRB 050509A: Further I-band imaging
  58. GRB050522,optical observation
  59. GRB050520,optical observation
  60. XRF 050522: Continued NIR P200 Monitoring
  61. RBO Observations of GRB050522
  62. GRB050509b: optical observations
  63. Recent GRB BVRcIc field photometry
  64. GRB050520: Radio Observations
  65. XRF 050522: Swift XRT observation
  66. XRF050522, BVRcIc field photometry
  67. XRF 050522 : Lulin observations
  68. XRF050522: Optical Observations
  69. XRF 050522: KAIT observations
  70. XRF 050522 detected with INTEGRAL
  71. GRB 050520: VLT/ULTRACAM observations
  72. Swift UVOT Observations of GRB 050520
  73. GRB 050520: Swift XRT refined analysis
  74. XRF050509C: Chandra Afterglow Detection
  75. XRF 050509c: Swift XRT Upper Limit
  76. XRF050509c: Radio Observations
  77. RBO Observations of GRB050520
  78. GRB 050520: P200 Observations
  79. GRB 050520: Swift XRT position
  80. GRB 050520: VLT/ULTRACAM observations
  81. GRB 050520 - A long GRB detected with INTEGRAL
  82. No Swift-BAT Lightcurves in real-time for next 3 weeks
  83. Swift-BAT trigger 122203 is not a real GRB
  84. XRF 050509C: REM NIR and Optical refined analysis
  85. GRB 050504: Swift XRT afterglow candidate has faded
  86. XRF 050509c optical afterglow
  87. GRB 050509B: Subaru Optical Observations
  88. GRB050502b: Early Observation
  89. GRB050509b, Bok telescope B-band imaging
  90. GRB050509b, SDSS pre-burst observations
  91. GRB 050509b: RAPTOR deep, early limits.
  92. GRB050509B: Optical/Infared observations
  93. GRB 050509b: Swift/UVOT follow-up measurements
  94. GRB 050509b Milagro GeV/TeV Observations
  95. GRB050509B: Optical observations at the Very Large Telescope
  96. GRB 050509b: No Optical Variability in XRT Error Circle
  97. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  98. GRB 050509a: Swift-BAT refined analysis
  99. GRB 050509c: ROTSE-III Optical Limits
  100. GRB 050509B: WSRT Radio Observations

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