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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"

24673 results found.

  1. IPN error box for GRB020813
  2. GRB020813, astrometric position
  3. Spectropolarimetry of GRB 020813
  4. GRB 020812 optical observation
  5. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  6. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  7. HST Imaging of the Host of GRB 011121
  8. GRB020801, optical afterglow candidate
  9. GRB020331: Late-time Optical Light Curve (re-submission)
  10. GRB020331: Late-time Optical Light Curve
  11. IPN triangulation of GRB020714
  12. IPN triangulation of GRB020715 (=GRB150702)
  13. IPN triangulation of GRB020714
  14. IPN triangulation of GRB150702
  15. GRB 020410: Discovery of Probable OT by HST
  16. GRB 020124, HST observations of the fading afterglow
  17. IPN triangulation of GRB020708
  18. IPN triangulation of GRB020708
  19. Correction to IPN error box for GRB020706
  20. IPN triangulation of GRB020706
  21. GRB 020705: Optical observations
  22. GRB 020625, optical observations
  23. GRB 020625: Optical observations
  24. GRB 020531: optical photometry of Chandra sources
  25. GRB020625 (=H2081): A Long Burst Localized by HETE
  26. The Probable Host Galaxy of GRB/XRF 020427
  27. GRB/XRF 020427, detection of an underlying system with the VLT
  28. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  29. AXP 1E2259+586 optical observations
  30. Fading Optical Source in the Field of GRB020531
  31. GRB 020531, INT+WFC deep optical upper limits
  32. SGR-like Bursts from the AXP 1E 2259+586
  33. GRB020405: polarimetric observations
  34. GRB 020531, simultaneous optical observations
  35. GRB 020531/Candidate Redshift
  36. GRB020531: Detection of Candidate Host Galaxy
  37. GRB020531: Second epoch Chandra observations
  38. GRB020604, optical observations
  39. GRB020604, BVRcIc field photometry
  40. GRB020603, BVRcIc field observations
  41. GRB020531, BVRcIc field photometry
  42. GRB020531 Optical Observations
  43. GRB020531: Observations with the Chandra X-ray Observatory
  44. GRB020531, optical observations
  45. GRB020531: optical observations
  46. GRB020531(=H2042): Optical Observations
  47. GRB020531(=H2042): Optical Observations
  48. GRB020531: Optical observations
  49. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  50. GRB020525, optical observations
  51. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  52. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  53. HST detection of the likely host galaxy of GRB 020124
  54. GRB020405 field photometry at ESO
  55. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  56. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  57. GRB020321 : Optical observations.
  58. XRF 020427
  59. GRB 020124: Optical observations
  60. IPN triangulation of GRB020418
  61. GRB020405: VLT observations of the OT environment
  62. IPN triangulation of GRB020413
  63. GRB020405: predicted break
  64. GRB 020409: No Evidence for an Optical Afterglow
  65. GRB 020331 Kyoto observation on March 31
  66. GRB020410: BeppoSAX NFI observation
  67. X-ray afterglow of GRB020321
  68. GRB020331 optical observations with RIMOTS
  69. GRB020124 optical observations with RIBOTS/RIMOTS
  70. GRB 020321: Candidate X-ray Counterparts
  71. GRB020406(?), optical observations
  72. GRB 020405: Decay index
  73. Short RXTE/ASM transient 020406; may be a GRB
  74. GRB020405, Radio Observations
  75. GRB 020405, U-band observations
  76. GRB011212: Optical Observations
  77. GRB 020331: NIR Observations
  78. GRB020331 NIR observation at KPNO (re-submission)
  79. GRB02033 NIR observation at KPNO
  80. GRB020331 field photometry
  81. GRB 020331, NIR observations
  82. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  83. GRB 020322: BeppoSAX observations of the X-ray afterglow
  84. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  85. Near-Infrared Observations of GRB020322 at TIRGO
  86. GRB 020321, Radio Observations
  87. GRB 020322: Optical Observations
  88. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  89. GRB 020321: Optical observations
  90. GRB020317 BVRI field photometry
  91. GRB011211 revised BVRI field photometry
  92. GRB020305 BVRI field photometry
  93. GRB020322 BVRI field photometry
  94. GRB 020322: Optical Sources and Improved Astrometry
  95. GRB020317: optical observations
  96. GRB020321 optical observations
  97. GRB020321: a faint BeppoSAX detection
  98. GRB 020317 : KISO Optical Observations
  99. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  100. GRB 020305: Optical Observations

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