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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"

41730 results found.

  1. GRB050223: analysis of the XMM-Newton observation
  2. GRB050316: MASTER before, simultanious and follow up optical
  3. GRB 050306: ROTSE-III early limits
  4. GRB050316: MASTER optical observations
  5. GRB 050315: Swift-BAT further refined analysis
  6. GRB 050315, SMARTS optical/IR afterglow observations
  7. GRB 050315 I-band observations
  8. GRB050315: Radio afterglow
  9. GRB 050315: Optical afterglow identification
  10. Non-detection of GRB050315 in ATCA Radio Observations
  11. GRB 050315: Swift XRT Position
  12. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  13. GRB 050315: Early Observations with Swift/UVOT
  14. Swift-BAT detection of GRB 050315
  15. GRB050223: No XMM-Newton OM detection of afterglow emission
  16. GRB 050306: Radio Observations
  17. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  18. GRB050309: CONCAM pre-trigger and trigger coincident optical
  19. GRB 050306: optical afterglow
  20. GRB 050126: Redshift determination
  21. Swift-BAT trigger 107873: No Swift XRT counterpart
  22. GRB 050309, Early optical limits from RAPTOR
  23. GRB 050306: further TAROT optical data
  24. GRB050309: Early optical limit from P60
  25. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  26. GRB 050309 : Lulin R-band observation
  27. Swift 107873: P60 Optical Observations
  28. GRB 050306: CORRECTION to date of observation
  29. GRB 050306: R-band observations
  30. GRB 050306: No Swift UVOT Optical Counterpart Detected
  31. GRB 050306: REM optical-infrared observations
  32. GRB 050306: Possible X-ray Afterglow Position from the Swift
  33. Swift trigger 107518: optical observation
  34. GRB 050306: TAROT optical observations
  35. GRB 050306,optical observation
  36. GRB 050306: Swift-BAT detection of a long burst
  37. Ongoing activity of SGR 1806-20 after the giant flare
  38. GRB050215B: Late-Time Swift UVOT Observations
  39. GRB 050126: Confirmation of the NIR afterglow candidate
  40. PROMPT VRcIc Observations of GRB 050223
  41. XRF/GRB 050215B: Radio Observations
  42. GRB 050219b: candidate NIR afterglow
  43. Confirmed XRF nature for GRB050215b
  44. GRB 050223: optical observations
  45. GRB050223 XMM-Newton observation
  46. INTEGRAL detection of GRB 050223
  47. GRB050223: No Swift UVOT Detection of Afterglow Emission
  48. GRB050223: ROTSE-III Optical Observations
  49. GRB 050223 Swift/BAT detection of a burst
  50. GRB 050223: Swift XRT Position
  51. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  52. GRB050219b: CORRECTION to time of UVOT observations
  53. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  54. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  55. GRB 050219a: Optical observations from LCO
  56. GRB 050219b: Optical and near-IR observations from LCO
  57. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  58. GRB 050219b: Swift-BAT detection of a burst
  59. GRB 050219b: CORRECTION: Swift XRT Position
  60. GRB 050219b: Swift XRT Position
  61. GRB 050219a, optical observations
  62. GRB 050219a: Refined XRT position
  63. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  64. GRB 050219: Swift-BAT detection of a burst
  65. GRB050215b: Swift UVOT Detection of Afterglow Emission
  66. GRB 050215B: Radio Observations
  67. GRB 050215b: XRT confirmation of IR afterglow candidate
  68. GRB050215b: P60 Optical Observations
  69. GRB 050215b: Swift XRT Source Variability
  70. GRB 050215b : Lulin follow-up observation
  71. GRB 050215b, BOOTES-2 simultaneous optical observations
  72. GRB 050215B: UKIRT K-band imaging
  73. GRB 050215b: Swift XRT Observations
  74. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  75. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  76. Swift-BAT detects two bursts: GRB050215a and GRB050215b
  77. GRB 050215b, BOOTES-1B optical limit
  78. GRB050215B: ROTSE-III optical observations
  79. GRB050215A: ROTSE-III Optical Observations
  80. GRB050209: TAROT optical observations
  81. GRB 050209(=U11568): Duration and spectrum
  82. short/hard GRB 050202, optical observations
  83. GRB050209: REM optical observations
  84. GRB 050209 I-band observation
  85. GRB 050209 Optical observations
  86. GRB050209: P60 Optical Observations
  87. GRB 050209: Optical observation
  88. GRB 050128: Radio observations
  89. Further analysis of the short Swift-BAT GRB 050202
  90. GRB 050202: Second epoch radio observations
  91. GRB 050129: Optical observations
  92. GRB050202: Radio Observations
  93. GRB 050202: Optical observations with LCO40
  94. GRB 050202: Short burst detected by Swift-BAT
  95. GRB 050128 Optical observation with REM
  96. GRB 050129: a weak long GRB detected with INTEGRAL
  97. SGR1806-20: Swift-BAT detection of a large normal burst
  98. GRB050128: Faulkes Telescope South observations
  99. GRB 050124: Radio Observations
  100. GRB 050128: near-infrared observations with REM

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