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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"

28049 results found.

  1. GRB020625 (=H2081): A Long Burst Localized by HETE
  2. The Probable Host Galaxy of GRB/XRF 020427
  3. GRB/XRF 020427, detection of an underlying system with the VLT
  4. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  5. AXP 1E2259+586 optical observations
  6. Fading Optical Source in the Field of GRB020531
  7. GRB 020531, INT+WFC deep optical upper limits
  8. SGR-like Bursts from the AXP 1E 2259+586
  9. GRB020405: polarimetric observations
  10. GRB 020531, simultaneous optical observations
  11. GRB 020531/Candidate Redshift
  12. GRB020531: Detection of Candidate Host Galaxy
  13. GRB020531: Second epoch Chandra observations
  14. GRB020604, optical observations
  15. GRB020604, BVRcIc field photometry
  16. GRB020603, BVRcIc field observations
  17. GRB020531, BVRcIc field photometry
  18. GRB020531 Optical Observations
  19. GRB020531: Observations with the Chandra X-ray Observatory
  20. GRB020531, optical observations
  21. GRB020531: optical observations
  22. GRB020531(=H2042): Optical Observations
  23. GRB020531(=H2042): Optical Observations
  24. GRB020531: Optical observations
  25. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  26. GRB020525, optical observations
  27. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  28. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  29. HST detection of the likely host galaxy of GRB 020124
  30. GRB020405 field photometry at ESO
  31. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  32. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  33. GRB020321 : Optical observations.
  34. XRF 020427
  35. GRB 020124: Optical observations
  36. IPN triangulation of GRB020418
  37. GRB020405: VLT observations of the OT environment
  38. IPN triangulation of GRB020413
  39. GRB020405: predicted break
  40. GRB 020409: No Evidence for an Optical Afterglow
  41. GRB 020331 Kyoto observation on March 31
  42. GRB020410: BeppoSAX NFI observation
  43. X-ray afterglow of GRB020321
  44. GRB020331 optical observations with RIMOTS
  45. GRB020124 optical observations with RIBOTS/RIMOTS
  46. GRB 020321: Candidate X-ray Counterparts
  47. GRB020406(?), optical observations
  48. GRB 020405: Decay index
  49. Short RXTE/ASM transient 020406; may be a GRB
  50. GRB020405, Radio Observations
  51. GRB 020405, U-band observations
  52. GRB011212: Optical Observations
  53. GRB 020331: NIR Observations
  54. GRB020331 NIR observation at KPNO (re-submission)
  55. GRB02033 NIR observation at KPNO
  56. GRB020331 field photometry
  57. GRB 020331, NIR observations
  58. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  59. GRB 020322: BeppoSAX observations of the X-ray afterglow
  60. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  61. Near-Infrared Observations of GRB020322 at TIRGO
  62. GRB 020321, Radio Observations
  63. GRB 020322: Optical Observations
  64. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  65. GRB 020321: Optical observations
  66. GRB020317 BVRI field photometry
  67. GRB011211 revised BVRI field photometry
  68. GRB020305 BVRI field photometry
  69. GRB020322 BVRI field photometry
  70. GRB 020322: Optical Sources and Improved Astrometry
  71. GRB020317: optical observations
  72. GRB020321 optical observations
  73. GRB020321: a faint BeppoSAX detection
  74. GRB 020317 : KISO Optical Observations
  75. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  76. GRB 020305: Optical Observations
  77. GRB020317, optical observations
  78. GRB 020317: Optical observations
  79. GRB 011121: Third HST Epoch
  80. GRB020305: Properties of the Candidate Optical Afterglow
  81. GRB 011121: HST Observations reveal an intermediate-time multicolor
  82. GRB011130 (XRF011130) Second Epoch Chandra Observations
  83. GRB020305: Subaru Optical Observations
  84. XRF/GRB 011030: Detection of the Probable Host Galaxy
  85. GRB 020305: Candidate optical afterglow
  86. GRB020305, optical observations
  87. IPN triangulation of GRB020305 (HETE 1939)
  88. GRB020305 (=H1939): Localization of a GRB by HETE
  89. HST Imaging of the afterglow and host of GRB 011121
  90. IPN detection and localization of Cygnus X-1 flares
  91. SGR1900+14 activity
  92. IPN Upper Limits to a GRB Associated With SN2002ap
  93. GRB020124 BVRI field photometry
  94. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  95. SN2002ap (SN/GRB?) Echelle spectra
  96. GRB020127 Optical Observations
  97. SN 2002ap in M74
  98. SN2002ap (SN/GRB?) UBVRI Field Photometry
  99. GRB020127: Chandra Observations and Prospective Counterparts
  100. pre-SN2002ap (SN/GRB?) imaging of M74

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