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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"

37715 results found.

  1. GRB050528: updated Liverpool Telescope limits
  2. Swift-BAT GRB 050528: a soft burst
  3. Update on Swift-BAT GRB 050528 (Trigger 130679)
  4. GRB050528: BOOTES optical candidate (retraction)
  5. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  6. GRB050528: BOOTES optical candidate
  7. Possible GRB050528: no candidate from Liverpool Telescope
  8. Swift-BAT detection of possible GRB 050528
  9. GRB050525a: Radio Observations
  10. GRB 050509b: refined XRT/Chandra afterglow position analysis
  11. GRB 050525: RTT150, Optical observations
  12. GRB050525a: optical upper limits
  13. GRB 050525a: SARA Observations
  14. GRB 050525B: Swift-BAT observations
  15. GRB 050525: MITSuME Optical Observation in VRI
  16. GRB 050525a: MDM Observations
  17. GRB050525A,optical observation
  18. GRB 050525 : Lulin optical afterglow observations
  19. GRB050525: Super-LOTIS observations
  20. GRB 050525, spectral lag pseudo-redshift
  21. GRB 050525a: Gemini/GMOS Spectra
  22. GRB050306: optical afterglow not confirmed
  23. GRB 050525: BART optical observation
  24. GRB 050525A: BOOTES simultaneous optical observations
  25. GRB 050525A: Swift-BAT refined analysis
  26. GRB050525: Optical observations
  27. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  28. GRB 050525: pseudo-redshift
  29. Swift/UVOT UV and optical detections of GRB 050525
  30. Konus-Wind observation of GRB 050525
  31. GRB 050525: TAROT observations of the early afterglow
  32. INTEGRAL detection of GRB 050525
  33. GRB 050525, infrared observations
  34. GRB 050525: Optical observation
  35. GRB 050525: observatons of the optical afterglow
  36. GRB050525: ROTSE-III Refined Analysis
  37. GRB 050525 - Very Bright, Not Short
  38. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  39. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  40. XRF050522: NIR observations of XRT candidate
  41. XRF050522: Radio Observations
  42. GRB 050509A: Further I-band imaging
  43. GRB050522,optical observation
  44. GRB050520,optical observation
  45. XRF 050522: Continued NIR P200 Monitoring
  46. RBO Observations of GRB050522
  47. GRB050509b: optical observations
  48. Recent GRB BVRcIc field photometry
  49. GRB050520: Radio Observations
  50. XRF050522, BVRcIc field photometry
  51. XRF050522: Optical Observations
  52. XRF 050522: KAIT observations
  53. XRF 050522 detected with INTEGRAL
  54. GRB 050520: VLT/ULTRACAM observations
  55. Swift UVOT Observations of GRB 050520
  56. GRB 050520: Swift XRT refined analysis
  57. RBO Observations of GRB050520
  58. GRB 050520: P200 Observations
  59. GRB050520: Liverpool Telescope follow-up
  60. GRB 050520: TAROT optical limit
  61. GRB 050520: Swift XRT position
  62. GRB 050520: VLT/ULTRACAM observations
  63. GRB 050520: OSN optical observations
  64. GRB 050520: BART optical limit
  65. GRB 050520 - A long GRB detected with INTEGRAL
  66. Swift-BAT trigger 122203 is not a real GRB
  67. GRB 050504: Swift XRT afterglow candidate has faded
  68. XRF 050509c optical afterglow
  69. GRB 050509B and short GRB-SN association? (corrected)
  70. GRB 050509B and short GRB-SN association?
  71. GRB 050509B: Subaru Optical Observations
  72. GRB050502b: Early Observation
  73. GRB050509b, Bok telescope B-band imaging
  74. Refined Chandra analysis of GRB 050509b
  75. GRB050509b, SDSS pre-burst observations
  76. GRB 050509b: Keck/Chandra Cross-Correlation
  77. GRB 050509b: Keck/Chandra Cross-Correlation
  78. Chandra observation of GRB 050509b
  79. GRB 050509b: RAPTOR deep, early limits.
  80. GRB050509B: Optical/Infared observations
  81. GRB 050509b: Swift/UVOT follow-up measurements
  82. GRB 050509b Milagro GeV/TeV Observations
  83. GRB050509B: Optical observations at the Very Large Telescope
  84. GRB 050509b: No Optical Variability in XRT Error Circle
  85. GRB 050509a: Swift-BAT refined analysis
  86. GRB 050509c: ROTSE-III Optical Limits
  87. GRB 050509B: WSRT Radio Observations
  88. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  89. GRB 050505, early TAROT observation
  90. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  91. GRB 050509b: Further Analysis of Keck LRIS Images
  92. GRB050509c: REM NIR and Optical observations
  93. GRB 050509b: Physical Properties of the Candidate Host galaxy
  94. GRB 050505: SARA Observations
  95. Swift UVOT Follow-up Observations of GRB 050509B
  96. GRB 050509B, Optical Observations
  97. GRB 050509B: Swift/XRT refined analysis
  98. GRB 050509b: Optical observations
  99. GRB 050509b: Precision Astrometry
  100. GRB 050509b: Possible Optical Counterpart

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