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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.

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

25840 results found.

  1. GRB020531: Observations with the Chandra X-ray Observatory
  2. GRB 020603: Optical Observations
  3. GRB 020603, R-band observation
  4. GRB020531: Upper Limit for Detection of Two TAROT Sources
  5. IPN triangulation of GRB020603 (possible short/hard GRB)
  6. GRB 020531 optical observations with TAROT
  7. GRB020531, optical observations
  8. GRB020531: optical observations
  9. GRB020531(=H2042): Optical Observations
  10. GRB020531(=H2042): Optical Observations
  11. GRB020531: Optical observations
  12. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  13. GRB020525, optical observations
  14. IPN triangulation of GRB020525
  15. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  16. GRB/XRF 020427, Radio Observations
  17. HST detection of the likely host galaxy of GRB 020124
  18. GRB020405 field photometry at ESO
  19. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  20. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  21. GRB020321 : Optical observations.
  22. XRF 020427
  23. GRB020331: Third Epoch and Revised Second Epoch Optical
  24. GRB 020124: Optical observations
  25. IPN triangulation of GRB020418
  26. GRB020405: VLT observations of the OT environment
  27. GRB020410: BeppoSAX NFI observations refined analysis
  28. GRB 020409, 2-nd epoch optical observations at Terskol.
  29. GRB 020409, No Optical Detection to R = 22
  30. GRB020410: second BeppoSAX NFI observation
  31. GRB 020409: No Evidence for an Optical Afterglow
  32. GRB 020331 Kyoto observation on March 31
  33. GRB 020410, optical observations
  34. BeppoSAX ALERT: possible GRB020410
  35. X-ray afterglow of GRB020321
  36. GRB020331: Confirmation of Afterglow Candidate with Magellan
  37. GRB020331 optical observations with RIMOTS
  38. GRB020124 optical observations with RIBOTS/RIMOTS
  39. GRB 020321: Candidate X-ray Counterparts
  40. GRB020331: Optical Observations of Afterglow Candidate
  41. GRB020406(?), optical observations
  42. Short RXTE/ASM transient 020406; may be a GRB
  43. GRB020405, Radio Observations
  44. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  45. GRB 020405, U-band observations
  46. GRB011212: Optical Observations
  47. GRB 020331: NIR Observations
  48. GRB020331 NIR observation at KPNO (re-submission)
  49. GRB02033 NIR observation at KPNO
  50. GRB020331 field photometry
  51. GRB 020331, NIR observations
  52. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  53. GRB 020322: BeppoSAX observations of the X-ray afterglow
  54. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  55. Near-Infrared Observations of GRB020322 at TIRGO
  56. GRB 020321, Radio Observations
  57. GRB 020322: Optical Observations
  58. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  59. GRB 020321: Optical observations
  60. GRB020317 BVRI field photometry
  61. GRB011211 revised BVRI field photometry
  62. GRB020305 BVRI field photometry
  63. GRB020322 BVRI field photometry
  64. GRB 020322: Optical Sources and Improved Astrometry
  65. GRB020322: Optical Observations
  66. GRB 020321: Optical observations
  67. GRB020317: optical observations
  68. GRB020321 optical observations
  69. GRB020321: BeppoSAX/NFI Observations
  70. GRB020321: a faint BeppoSAX detection
  71. GRB 020317 : KISO Optical Observations
  72. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  73. GRB 020305: Optical Observations
  74. GRB020317, optical observations
  75. GRB 020317: Optical observations
  76. GRB 011121: Third HST Epoch
  77. GRB020305: Properties of the Candidate Optical Afterglow
  78. GRB 011121: HST Observations reveal an intermediate-time multicolor
  79. GRB011121, possible supernova association
  80. GRB011130 (XRF011130) Second Epoch Chandra Observations
  81. XRF/GRB 011030: Detection of the Probable Host Galaxy
  82. Type Ic SN2002bl (SN/GRB?) Radio Observations
  83. GRB020305, optical observations
  84. IPN triangulation of GRB020305 (HETE 1939)
  85. GRB020305 (=H1939): Localization of a GRB by HETE
  86. HST Imaging of the afterglow and host of GRB 011121
  87. IPN detection and localization of Cygnus X-1 flares
  88. GRB020127: Further VLA Observations of Possible Counterparts
  89. RXTE Observations of SGR 1900+14
  90. SGR1900+14 activity
  91. IPN/HETE Detection of Bursts from SGR1900+14
  92. IPN Upper Limits to a GRB Associated With SN2002ap
  93. GRB020124 BVRI field photometry
  94. GRB020127: Palomar and VLA Observations of Possible Counterparts
  95. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  96. SN2002ap (SN/GRB?) Echelle spectra
  97. GRB020127 Optical Observations
  98. SN 2002ap (SN/GRB?)
  99. SN2002ap (SN/GRB?) UBVRI Field Photometry
  100. GRB020127: Chandra Observations and Prospective Counterparts

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