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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').
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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"

28055 results found.

  1. Correction to IPN error box for GRB020706
  2. IPN triangulation of GRB020706
  3. GRB 020705: Optical observations
  4. GRB 020625, optical observations
  5. GRB 020625: Optical observations
  6. GRB 020531: optical photometry of Chandra sources
  7. GRB020625 (=H2081): A Long Burst Localized by HETE
  8. The Probable Host Galaxy of GRB/XRF 020427
  9. GRB/XRF 020427, detection of an underlying system with the VLT
  10. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  11. AXP 1E2259+586 optical observations
  12. Fading Optical Source in the Field of GRB020531
  13. GRB 020531, INT+WFC deep optical upper limits
  14. SGR-like Bursts from the AXP 1E 2259+586
  15. GRB020405: polarimetric observations
  16. GRB 020531, simultaneous optical observations
  17. GRB 020531/Candidate Redshift
  18. GRB020531: Detection of Candidate Host Galaxy
  19. GRB020531: Second epoch Chandra observations
  20. GRB020604, optical observations
  21. GRB020604, BVRcIc field photometry
  22. GRB020603, BVRcIc field observations
  23. GRB020531, BVRcIc field photometry
  24. GRB020531 Optical Observations
  25. GRB020531: Observations with the Chandra X-ray Observatory
  26. GRB020531, optical observations
  27. GRB020531: optical observations
  28. GRB020531(=H2042): Optical Observations
  29. GRB020531(=H2042): Optical Observations
  30. GRB020531: Optical observations
  31. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  32. GRB020525, optical observations
  33. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  34. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  35. HST detection of the likely host galaxy of GRB 020124
  36. GRB020405 field photometry at ESO
  37. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  38. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  39. GRB020321 : Optical observations.
  40. XRF 020427
  41. GRB 020124: Optical observations
  42. IPN triangulation of GRB020418
  43. GRB020405: VLT observations of the OT environment
  44. IPN triangulation of GRB020413
  45. GRB020405: predicted break
  46. GRB 020409: No Evidence for an Optical Afterglow
  47. GRB 020331 Kyoto observation on March 31
  48. GRB020410: BeppoSAX NFI observation
  49. X-ray afterglow of GRB020321
  50. GRB020331 optical observations with RIMOTS
  51. GRB020124 optical observations with RIBOTS/RIMOTS
  52. GRB 020321: Candidate X-ray Counterparts
  53. GRB020406(?), optical observations
  54. GRB 020405: Decay index
  55. Short RXTE/ASM transient 020406; may be a GRB
  56. GRB020405, Radio Observations
  57. GRB 020405, U-band observations
  58. GRB011212: Optical Observations
  59. GRB 020331: NIR Observations
  60. GRB020331 NIR observation at KPNO (re-submission)
  61. GRB02033 NIR observation at KPNO
  62. GRB020331 field photometry
  63. GRB 020331, NIR observations
  64. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  65. GRB 020322: BeppoSAX observations of the X-ray afterglow
  66. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  67. Near-Infrared Observations of GRB020322 at TIRGO
  68. GRB 020321, Radio Observations
  69. GRB 020322: Optical Observations
  70. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  71. GRB 020321: Optical observations
  72. GRB020317 BVRI field photometry
  73. GRB011211 revised BVRI field photometry
  74. GRB020305 BVRI field photometry
  75. GRB020322 BVRI field photometry
  76. GRB 020322: Optical Sources and Improved Astrometry
  77. GRB020317: optical observations
  78. GRB020321 optical observations
  79. GRB020321: a faint BeppoSAX detection
  80. GRB 020317 : KISO Optical Observations
  81. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  82. GRB 020305: Optical Observations
  83. GRB020317, optical observations
  84. GRB 020317: Optical observations
  85. GRB 011121: Third HST Epoch
  86. GRB020305: Properties of the Candidate Optical Afterglow
  87. GRB 011121: HST Observations reveal an intermediate-time multicolor
  88. GRB011130 (XRF011130) Second Epoch Chandra Observations
  89. GRB020305: Subaru Optical Observations
  90. XRF/GRB 011030: Detection of the Probable Host Galaxy
  91. GRB 020305: Candidate optical afterglow
  92. GRB020305, optical observations
  93. IPN triangulation of GRB020305 (HETE 1939)
  94. GRB020305 (=H1939): Localization of a GRB by HETE
  95. HST Imaging of the afterglow and host of GRB 011121
  96. IPN detection and localization of Cygnus X-1 flares
  97. SGR1900+14 activity
  98. IPN Upper Limits to a GRB Associated With SN2002ap
  99. GRB020124 BVRI field photometry
  100. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts

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