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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.

Advanced Search Examples (click to copy):

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

24375 results found.

  1. GRB 071112C MITSuME Akeno early optical observation
  2. GRB 071112C: Swift-BAT refined analysis
  3. GRB 071112C: Swift XRT refined analysis
  4. GRB 071112C: Optical observations at Crni Vrh
  5. GRB 071112B: Magellan i-band imaging
  6. GRB 071112B: Gemini Optical Imaging
  7. GRB 071112B, Swift-BAT partial refined analysis of the SHB
  8. GRB071112C Xinglong_TNT_and_EST_afterglow observations
  9. GRB 071112C: Optical and NIR afterglows observed with KANATA
  10. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  11. GRB 071112B: ROTSE-III Rapid Optical Limits
  12. GRB 071112: Swift detection of a possible burst
  13. VLA IInd observation of INTEGRAL burst GRB 071109
  14. GRB 071109: IBIS refined analysis
  15. GRB 071109: A long GRB detected by INTEGRAL
  16. GRB 071104: Swift-XRT Team Refined Analysis
  17. GRB 071104: Gamma Ray Burst Localization by SuperAGILE
  18. GRB071010b: optical observation
  19. GRB 071101, Swift-BAT refined analysis
  20. GRB 071101: Swift-XRT Team refined analysis
  21. GRB071101: Optical and NIR upper limits by KANATA
  22. GRB0711101: Two new source from Xinglong TNT observation
  23. GRB 071101: a nearby galaxy
  24. GRB 071031, Swift-BAT refined analysis
  25. GRB 071031: Swift-XRT Team refined analysis
  26. GRB 071031, SMARTS afterglow observations
  27. GRB071031: Rapid PROMPT Detections
  28. GRB 071028B Swift-BAT detection of a burst
  29. GRB071025: Optical+NIR observations
  30. Swift UVOT upper limits to GRB071028
  31. GRB071028: Xinglong EST V-band upper limit
  32. GRB 071028: Swift-XRT Team refined analysis
  33. GRB 071028, Swift-BAT refined analysis
  34. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  35. GRB 071018: Revised BAT position
  36. GRB071020, optical upper limit
  37. GRB 071025: SARA VRI upper limits
  38. GRB 071025: SQIID JHK photometry
  39. GRB 071025A: Complex Early-Time IR Behavior, Simultaneous with Gamma- and X-rays
  40. Swift UVOT upper limits
  41. GRB071025: Xinglong TNT I-band upper limit
  42. GRB 071025: Swift-XRT Team refined analysis
  43. GRB 071025, Swift-BAT refined analysis
  44. GRB 071025: Early Super-LOTIS Observations
  45. GRB 071025: R/I-band update
  46. GRB071021 : CFHT Ks-band observation
  47. GRB 071025: I-detection, R-dropout?
  48. GRB 071025: ROTSE-III Detection of Optical Counterpart
  49. GRB 071025: Swift detection of a burst
  50. GRB071021: Optical+NIR observations
  51. Possible radio detection of GRB 071021 with the VLA
  52. Optical observations of GRB 071020
  53. Radio detection of GRB 071020 with the VLA
  54. GRB071010b: optical observation
  55. GRB071021: MITSuME Okayama Optical Upper Limits
  56. GRB 071021: possible high-z burst
  57. GRB 071021, Swift-BAT refined analysis
  58. GRB 071021: Swift-XRT Team refined analysis
  59. GRB 071021: Xinglong TNT optical Upper Limit
  60. Konus-Wind observation of GRB 071020
  61. GRB 071021: Faulkes Telescope South optical candidate
  62. GRB071020A: Xinglong TNT Optical afterglow observations
  63. GRB 071020: Swift-XRT refined analysis
  64. GRB 071020, Swift-BAT refined analysis
  65. GRB 071020A: IR Imaging with PAIRITEL
  66. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  67. Swift autonomous slewing re-enabled
  68. GRB071010b: optical observations
  69. GRB 071018: Swift-XRT observation
  70. GRB 071018: Possible OT from Xinglong TNT observation
  71. GRB 071010B: Light Curve Break Confirmed
  72. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  73. GRB 071018, Swift-BAT refined analysis
  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: TLS 2nd Epoch, refined analysis
  84. GRB 071013: TLS Upper Limit
  85. GRB 071013, Swift-BAT refined analysis
  86. GRB071010B, BVRcIc field calibration
  87. GRB 20071013: Xinglong TNT optical Upper Limit
  88. GRB 071011: Xinglong TNT Optical afterglow observations
  89. GRB 071010B correction to GCN 6892 optical observations
  90. GRB 071011: Confirmation of P60 optical afterglow
  91. GRB 071010B optical photometry
  92. GRB 071011, Swift-BAT refined analysis
  93. GRB 071010B: Bright OT confirmed with TLS
  94. Konus-Wind observation of GRB 071010B
  95. GRB 071010B, Swift-BAT refined analysis
  96. GRB 071010A: bright NIR afterglow
  97. GRB 071006, Swift-BAT refined analysis
  98. GRB 071008, Swift-BAT refined analysis
  99. GRB 071010, Swift-BAT refined analysis
  100. GRB 071010: Rapid PROMPT Detections

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