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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"

42902 results found.

  1. GRB 071028B Swift-BAT detection of a burst
  2. GRB071025: Optical+NIR observations
  3. GRB 071028: SARA observations of variable source
  4. Swift UVOT upper limits to GRB071028
  5. GRB071028: Xinglong EST V-band upper limit
  6. GRB 071028: Swift-XRT Team refined analysis
  7. GRB 071028, Swift-BAT refined analysis
  8. GRB 071028: Swift detection of a burst
  9. GRB 071025: Kuiper Telescope Optical Observations
  10. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  11. GRB 071018: Revised BAT position
  12. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  13. GRB071021: MARGE Optical Limits
  14. GRB 071025 Milagro GeV/TeV Observations
  15. GRB 071025A: Complex Early-Time IR Behavior, Simultaneous with Gamma- and X-rays
  16. GRB071025: Optical Pre-imaging from Palomar
  17. Swift UVOT upper limits
  18. GRB071025: Xinglong TNT I-band upper limit
  19. GRB 071025: Swift-XRT Team refined analysis
  20. GRB 060602A: host redshift
  21. GRB 071025, Swift-BAT refined analysis
  22. GRB 071025: Early Super-LOTIS Observations
  23. GRB 071025: R/I-band update
  24. GRB 071025: ROTSE-III Refined Analysis
  25. GRB 071025: I-detection, R-dropout?
  26. GRB 071025: Swift XRT refined position
  27. GRB 071025a: PAIRITEL observations
  28. GRB071025: REM NIR afterglow
  29. GRB 071025: ROTSE-III Detection of Optical Counterpart
  30. GRB 071025: Swift detection of a burst
  31. GRB 071021: R-band detection and analysis
  32. GRB 071020: BTA spectroscopy
  33. Possible radio detection of GRB 071021 with the VLA
  34. Optical observations of GRB 071020
  35. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  36. Radio detection of GRB 071020 with the VLA
  37. GRB071010b: optical observation
  38. GRB 071021: Magellan i-band observation
  39. GRB 071021: Magellan R-band observation
  40. GRB 071021: Z-band detection
  41. GRB 071021: correction to GCNC 6968
  42. GRB 071020: Fading slowly?
  43. GRB 071010B: Fading quickly
  44. GRB 071021: optical and NIR observations
  45. GRB 071021, Swift-BAT refined analysis
  46. GRB071018: 2nd epoch obsevations of Xinglong TNT
  47. GRB 071021: retraction of Faulkes Telescope South candidate
  48. GRB 071021: Swift-XRT Team refined analysis
  49. GRB 071021: Xinglong TNT optical Upper Limit
  50. Konus-Wind observation of GRB 071020
  51. GRB 071021: Faulkes Telescope South optical candidate
  52. GRB 071021: Swift detection of a burst
  53. GRB071020A: Xinglong TNT Optical afterglow observations
  54. GRB 071020: Swift-XRT refined analysis
  55. GRB 071020, Swift-BAT refined analysis
  56. GRB 071020A: IR Imaging with PAIRITEL
  57. GRB 071020: VLT spectroscopy
  58. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  59. GRB071020 - SDSS Pre-burst Observations
  60. GRB 071020: Swift detection of a bright burst
  61. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  62. GRB 071018: Mercator Telescope optical observations
  63. Swift autonomous slewing re-enabled
  64. GRB071010b: optical observations
  65. GRB 071018: SARA observations
  66. GRB 071018: Swift-XRT observation
  67. GRB 071017 - Swift XRT observations
  68. VLA radio observation of GRB 071018
  69. GRB 071018: Possible OT from Xinglong TNT observation
  70. GRB 071010B: Light Curve Break Confirmed
  71. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  72. GRB 071018, Swift-BAT refined analysis
  73. GRB 071018?: Swift detection of a possible burst
  74. GRB 071010B: Suzaku WAM observation of the prompt emission
  75. GRB 071013: 3rd TLS Epoch - constraints on variability
  76. GRB 071010B: Keck/DEIMOS emission-line redshift
  77. GRB 071017: a SHORT GRB detected by INTEGRAL
  78. GRB 071013: TLS 2nd epoch - Kornienko candidate constant
  79. GRB071013: optical observations
  80. GRB 071010B: Optical observations of EST
  81. GRB 071010B: TLS 3rd Epoch - finally a break??
  82. GRB 070920A: deep optical observations at the NOT
  83. GRB 071010B: Photometry after 1.6 days
  84. GRB 071010B: Keck/LRIS Photometry
  85. GRB 071010B: TLS 2nd Epoch, refined analysis
  86. GRB 071013: TLS Upper Limit
  87. Correction to GCN circular no. # 6915 for GRB 071010B
  88. VLA detection of radio afterglow of GRB 071010B
  89. VLA non-detection of GRB 071011
  90. GRB 071013, Swift-BAT refined analysis
  91. GRB071013: optical limit
  92. GRB071010B, BVRcIc field calibration
  93. GRB 20071013: Xinglong TNT optical Upper Limit
  94. GRB 071013: Swift detection of a burst
  95. GRB 071010C Swift-BAT detection of a burst
  96. GRB 071011: Optical Limit after 13.95hrs
  97. GRB 071011: Xinglong TNT Optical afterglow observations
  98. GRB 071010B correction to GCN 6892 optical observations
  99. GRB 071011: Swift-XRT refined analysis
  100. VLA non-detection of GRB 071010A

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