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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"

32725 results found.

  1. GRB 050525a, infrared observations
  2. GRB 050525a, SMARTS optical/IR afterglow observations
  3. Correction to GCN Circ 3502 on GRB 050528
  4. Swift-BAT GRB 050528: a soft burst
  5. Update on Swift-BAT GRB 050528 (Trigger 130679)
  6. GRB050528: BOOTES optical candidate (retraction)
  7. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  8. GRB050525a: Radio Observations
  9. GRB 050509b: refined XRT/Chandra afterglow position analysis
  10. GRB050525a: optical upper limits
  11. GRB 050525a: SARA Observations
  12. GRB 050525B: Swift-BAT observations
  13. GRB 050525: MITSuME Optical Observation in VRI
  14. GRB 050525a: MDM Observations
  15. GRB050525A,optical observation
  16. GRB 050525 : Lulin optical afterglow observations
  17. GRB050525: Super-LOTIS observations
  18. GRB 050525, spectral lag pseudo-redshift
  19. GRB 050525a: Gemini/GMOS Spectra
  20. GRB050306: optical afterglow not confirmed
  21. GRB 050525: BART optical observation
  22. GRB 050525A: BOOTES simultaneous optical observations
  23. GRB 050525A: Swift-BAT refined analysis
  24. GRB050525: Optical observations
  25. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  26. Swift/UVOT UV and optical detections of GRB 050525
  27. Konus-Wind observation of GRB 050525
  28. GRB 050525: TAROT observations of the early afterglow
  29. INTEGRAL detection of GRB 050525
  30. GRB 050525, infrared observations
  31. GRB 050525: Optical observation
  32. GRB 050525: observatons of the optical afterglow
  33. GRB050525: ROTSE-III Refined Analysis
  34. GRB 050525 - Very Bright, Not Short
  35. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  36. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  37. XRF050522: NIR observations of XRT candidate
  38. XRF 050522: Swift XRT refined analysis
  39. XRF050522: Radio Observations
  40. Swift/UVOT observation of XRF 050522
  41. GRB 050509A: Further I-band imaging
  42. XRF 050522: Continued NIR P200 Monitoring
  43. RBO Observations of GRB050522
  44. GRB050520: Radio Observations
  45. XRF 050522: Swift XRT observation
  46. XRF050522, BVRcIc field photometry
  47. XRF 050522 : Lulin observations
  48. XRF050522: Optical Observations
  49. XRF050522: Near-infrared Observations
  50. XRF 050522: KAIT observations
  51. GRB 050520: VLT/ULTRACAM observations
  52. Swift UVOT Observations of GRB 050520
  53. GRB 050520: Swift XRT refined analysis
  54. XRF050509C: Chandra Afterglow Detection
  55. XRF 050509c: Swift XRT Upper Limit
  56. XRF050509c: Radio Observations
  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. No Swift-BAT Lightcurves in real-time for next 3 weeks
  65. Swift-BAT trigger 122203 is not a real GRB
  66. XRF 050509C: REM NIR and Optical refined analysis
  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. Chandra observation of GRB 050509b
  78. GRB 050509b: RAPTOR deep, early limits.
  79. GRB050509B: Optical/Infared observations
  80. GRB 050509b: Swift/UVOT follow-up measurements
  81. GRB 050509b Milagro GeV/TeV Observations
  82. GRB050509B: Optical observations at the Very Large Telescope
  83. GRB 050509b: No Optical Variability in XRT Error Circle
  84. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  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. GRB 050509b: Physical Properties of the Candidate Host galaxy
  93. GRB 050505: SARA Observations
  94. Swift UVOT Follow-up Observations of GRB 050509B
  95. GRB 050509B, Optical Observations
  96. GRB 050509B: Swift/XRT refined analysis
  97. GRB050509a: Swift UVOT observations
  98. GRB 050509b: Optical observations
  99. GRB 050509b: Precision Astrometry
  100. GRB 050509b: Possible Optical Counterpart

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