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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

28089 results found.

  1. PROMPT Rc Observations of GRB 050709
  2. GRB 050525a: PROMPT VRcIc Detections
  3. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  4. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  5. GRB 050626: Swift XRT observations
  6. GRB 050408: ARC 3.5-meter NIR Observations
  7. GRB 050701: Refined XRT analysis
  8. Swift UVOT observations of GRB 050701
  9. GRB050701: Swift-BAT Refined analysis
  10. Swift trigger 143708 is really GRB 050701
  11. GRB 050607, radio observations
  12. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  13. GRB050525a: HST Observations
  14. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  15. XRF 050509c: Optical monitoring
  16. Konus-Wind observation of an intermediate burst from SGR 1806-20
  17. XRF050509c: Radio Detection
  18. GRB 050607 optical decay
  19. GRB050607: refined analysis of prompt REM observations
  20. GRB 050607: PROMPT VRcIc Observations
  21. GRB 050607: Optical decay and spectral slope
  22. GRB050607,optical observation
  23. Optical Afterglow of GRB 050607
  24. GRB050607: Swift Detection of a long GRB
  25. GRB050607: prompt REM observations
  26. Limits on a SN in the field of GRB 050509b
  27. GRB 050603 - XRT data analysis of the first day
  28. GRB050603, submillimetre observations
  29. GRB050603: Radio Detection
  30. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  31. GRB 050603: INTEGRAL shows it is not a short GRB
  32. GRB 050525a, infrared observations
  33. GRB050528, XRT observations
  34. GRB050528: updated Liverpool Telescope limits
  35. Swift-BAT GRB 050528: a soft burst
  36. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  37. Possible GRB050528: no candidate from Liverpool Telescope
  38. GRB050525a: Radio Observations
  39. GRB 050509b: refined XRT/Chandra afterglow position analysis
  40. GRB 050525: RTT150, Optical observations
  41. GRB 050525a: SARA Observations
  42. GRB 050525B: Swift-BAT observations
  43. GRB 050525: MITSuME Optical Observation in VRI
  44. GRB050525A,optical observation
  45. GRB050525: Super-LOTIS observations
  46. GRB 050525, spectral lag pseudo-redshift
  47. GRB050306: optical afterglow not confirmed
  48. GRB 050525: BART optical observation
  49. GRB 050525A: BOOTES simultaneous optical observations
  50. GRB 050525A: Swift-BAT refined analysis
  51. GRB050525: Optical observations
  52. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  53. Konus-Wind observation of GRB 050525
  54. GRB 050525: TAROT observations of the early afterglow
  55. INTEGRAL detection of GRB 050525
  56. GRB 050525, infrared observations
  57. GRB 050525: observatons of the optical afterglow
  58. GRB050525: ROTSE-III Refined Analysis
  59. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  60. XRF050522: Radio Observations
  61. Swift/UVOT observation of XRF 050522
  62. GRB 050509A: Further I-band imaging
  63. GRB050522,optical observation
  64. GRB050520,optical observation
  65. XRF 050522: Continued NIR P200 Monitoring
  66. RBO Observations of GRB050522
  67. Recent GRB BVRcIc field photometry
  68. GRB050520: Radio Observations
  69. XRF 050522: Swift XRT observation
  70. XRF050522, BVRcIc field photometry
  71. XRF050522: Optical Observations
  72. XRF050522: Near-infrared Observations
  73. GRB 050520: VLT/ULTRACAM observations
  74. GRB 050520: Swift XRT refined analysis
  75. XRF050509C: Chandra Afterglow Detection
  76. XRF050509c: Radio Observations
  77. GRB 050520: P200 Observations
  78. GRB 050520: TAROT optical limit
  79. GRB 050520: VLT/ULTRACAM observations
  80. XRF 050509c optical afterglow
  81. GRB 050509B and short GRB-SN association? (corrected)
  82. GRB 050509B and short GRB-SN association?
  83. GRB050502b: Early Observation
  84. GRB050509b, Bok telescope B-band imaging
  85. Refined Chandra analysis of GRB 050509b
  86. GRB050509b, SDSS pre-burst observations
  87. GRB 050509b: Keck/Chandra Cross-Correlation
  88. GRB 050509b: Keck/Chandra Cross-Correlation
  89. Chandra observation of GRB 050509b
  90. GRB 050509b: RAPTOR deep, early limits.
  91. GRB050509B: Optical observations at the Very Large Telescope
  92. GRB 050509b: No Optical Variability in XRT Error Circle
  93. GRB 050509a: Swift-BAT refined analysis
  94. GRB 050509c: ROTSE-III Optical Limits
  95. GRB 050505, early TAROT observation
  96. GRB050509c: REM NIR and Optical observations
  97. GRB 050509b: Physical Properties of the Candidate Host galaxy
  98. GRB 050505: SARA Observations
  99. GRB 050509B, Optical Observations
  100. GRB 050509B: Swift/XRT refined analysis

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