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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"

32770 results found.

  1. GRB 050626 optical observations
  2. GRB 050701
  3. GRB 050701, optical observations
  4. GRB 050408: ARC 3.5-meter NIR Observations
  5. GRB 050701: Refined XRT analysis
  6. Swift UVOT observations of GRB 050701
  7. GRB050701: Swift-BAT Refined analysis
  8. GRB 050701: Swift XRT afterglow position
  9. GRB 050607, radio observations
  10. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  11. GRB 050626 - Correction to GCN 3552
  12. GRB 050626 - a long GRB detected with INTEGRAL
  13. GRB 050525A: Swift Late-Time Decay Rate
  14. GRB050525a: HST Observations
  15. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  16. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  17. XRF 050509c: Optical monitoring
  18. XRF050509c: Radio Detection
  19. GRB 050416(a): Host Galaxy Redshift Determination
  20. GRB 050607: MDM Observation
  21. GRB 050607: RTT150 optical observations
  22. GRB050607: refined analysis of prompt REM observations
  23. Swift/UVOT observations of GRB050607
  24. GRB 050607 : Lulin R-band observation
  25. GRB 050607: PROMPT VRcIc Observations
  26. GRB 050607: RAPTOR-S Early Optical Limits
  27. GRB050607: KAIT optical limits
  28. GRB 050525a, Mid-Infrared Observations
  29. GRB 050607: MDM Observations
  30. GRB050607,optical observation
  31. GRB 050607 - XRT refined data analysis
  32. GRB 050603: prediction of t_break
  33. Limits on a SN in the field of GRB 050509b
  34. GRB 050603: Redshift
  35. GRB 050603 - XRT data analysis of the first day
  36. Konus-Wind observation of GRB 050603
  37. GRB 050603: Analysis of UVOT data
  38. GRB050603: Fading Afterglow observed by Swift UVOT
  39. GRB050603, submillimetre observations
  40. GRB 050603: Swift XRT Position
  41. GRB050603: Radio Detection
  42. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  43. GRB 050603: Afterglow Identification from LCO
  44. GRB 050603: INTEGRAL shows it is not a short GRB
  45. GRB 050408: jet break in the XRT light curve
  46. GRB 050525a, infrared observations
  47. GRB 050525a, SMARTS optical/IR afterglow observations
  48. Correction to GCN Circ 3502 on GRB 050528
  49. Swift-BAT GRB 050528: a soft burst
  50. Update on Swift-BAT GRB 050528 (Trigger 130679)
  51. GRB050528: BOOTES optical candidate (retraction)
  52. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  53. GRB050525a: Radio Observations
  54. GRB 050509b: refined XRT/Chandra afterglow position analysis
  55. GRB050525a: optical upper limits
  56. GRB 050525a: SARA Observations
  57. GRB 050525B: Swift-BAT observations
  58. GRB 050525: MITSuME Optical Observation in VRI
  59. GRB 050525a: MDM Observations
  60. GRB050525A,optical observation
  61. GRB 050525 : Lulin optical afterglow observations
  62. GRB050525: Super-LOTIS observations
  63. GRB 050525, spectral lag pseudo-redshift
  64. GRB 050525a: Gemini/GMOS Spectra
  65. GRB050306: optical afterglow not confirmed
  66. GRB 050525: BART optical observation
  67. GRB 050525A: BOOTES simultaneous optical observations
  68. GRB 050525A: Swift-BAT refined analysis
  69. GRB050525: Optical observations
  70. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  71. Swift/UVOT UV and optical detections of GRB 050525
  72. Konus-Wind observation of GRB 050525
  73. GRB 050525: TAROT observations of the early afterglow
  74. INTEGRAL detection of GRB 050525
  75. GRB 050525, infrared observations
  76. GRB 050525: Optical observation
  77. GRB 050525: observatons of the optical afterglow
  78. GRB050525: ROTSE-III Refined Analysis
  79. GRB 050525 - Very Bright, Not Short
  80. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  81. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  82. XRF050522: NIR observations of XRT candidate
  83. XRF 050522: Swift XRT refined analysis
  84. XRF050522: Radio Observations
  85. Swift/UVOT observation of XRF 050522
  86. GRB 050509A: Further I-band imaging
  87. XRF 050522: Continued NIR P200 Monitoring
  88. RBO Observations of GRB050522
  89. GRB050520: Radio Observations
  90. XRF 050522: Swift XRT observation
  91. XRF050522, BVRcIc field photometry
  92. XRF 050522 : Lulin observations
  93. XRF050522: Optical Observations
  94. XRF050522: Near-infrared Observations
  95. XRF 050522: KAIT observations
  96. GRB 050520: VLT/ULTRACAM observations
  97. Swift UVOT Observations of GRB 050520
  98. GRB 050520: Swift XRT refined analysis
  99. XRF050509C: Chandra Afterglow Detection
  100. XRF 050509c: Swift XRT Upper Limit

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