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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"

25077 results found.

  1. GRB030329: RTT150 optical observations and upper limit for a host
  2. GRB 030429: redshift from VLT spectroscopy
  3. GRB030501B triangulation (single error box)
  4. GRB 030329, BVRI photometry
  5. GRB030429: Optical Observations
  6. GRB030501: TAROT candidate afterglow present in archival images
  7. GRB 030429: confirmation of afterglow candidate
  8. GRB 030329 Oprical observations in Rozhen observatory
  9. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  10. IPN triangulation of GRB030425 (single error box)
  11. GRB 030329, the review of the sky area in plate archive (1950-1998)
  12. GRB 030329: optical spectropolarimetry at VLT
  13. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  14. GRB030329: optical polarization
  15. IPN triangulation of GRB030422 (two large error boxes)
  16. GRB030329, optical observation
  17. MASTER:optical observations GRB030418
  18. MASTER:optical observations probable GRB030414
  19. GRB030418: Kiso near infrared observations
  20. GRB 030418: Optical afterglow
  21. OT GRB 030329: early UBVRcIc spectral evolution
  22. OT GRB 030329: early spectrum
  23. IPN triangulation of GRB030414 (small error box)
  24. IPN triangulation of GRB030413 (small error box)
  25. Superluminal motion in GRB 030329 (Correction)
  26. Superluminal motion in GRB 030329
  27. GRB030329, optical position
  28. IPN triangulation of GRB030406 (small error box)
  29. IPN triangulation of GRB050403 (small error box)
  30. GRB 030329: BVRI photometry at Asiago
  31. GRB 030329: VLT V-band photometry
  32. Kiso observation of the GRB030329 at April 6
  33. GRB 030329, color evolution
  34. GRB030328, UBVRcIc field photometry
  35. GRB 030329 Optical observations
  36. GRB030329: Kiso B and R band observations
  37. GRB030328: R upper limit after 6 hours by MASTER
  38. SDSS 0.5m PT observations of GRB030329 (correction)
  39. SDSS 0.5m PT observations of GRB030329
  40. GRB030329: final R-band light curve by MASTER
  41. GRB030329, optical observation
  42. GRB030329, new UBVRcIc field photometry
  43. GRB 030329, light curve and SN prediction
  44. GRB 030329, BRI photometry
  45. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  46. GRB030329: Optical observations at Teramo
  47. GRB 030329: Radio observations at GMRT
  48. Further AAVSO V,B,R observations of GRB030329
  49. GRB 030329: Additional Mt. Laguna Optical Observations
  50. GRB 030329: Observations with ANDICAM
  51. GRB030329: further optical photometry and evidence for a light curve discontinuity
  52. triangulation of GRB 030331 (single error box)
  53. GRB 030329: optical observations
  54. Photometry of GRB030329 - Constant OT Magnitude
  55. GRB030329 - OT brightens
  56. GRB 030329, optical photometry
  57. GRB 030324: Optical and NIR Observations
  58. GRB030329: R band light curve by MASTER
  59. GRB030329 - Light curve flattening
  60. GRB 030324, optical search
  61. GRB 030329, optical observations
  62. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  63. GRB030329a: detection by Konus-Wind
  64. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  65. GRB030329, BVRcIc field photometry
  66. GRB030329, SPM optical observations
  67. GRB 030329: Optical decay and synthesis
  68. GRB030329 optical observations
  69. GRB 030329: Optical pre-Imaging
  70. GRB 030329: Upper limit from 5.6 hours before trigger
  71. GRB030328: X-ray Afterglow Observed with Chandra
  72. GRB 030329, R-band observations
  73. GRB 030329: OT B and R photometry, decline rate
  74. GRB030329: Upper limits from recent and historical observations.
  75. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  76. GRB 030329: Optical Afterglow Observations
  77. GRB 030328: optical observations
  78. GRB 030329: Optical afterglow fading
  79. GRB 030328: OT photometry
  80. GRB030328: optical spectroscopy at TNG
  81. GRB030328: optical photometry at the TNG
  82. VLT spectra of GRB 030328
  83. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  84. GRB 030328: Optical observations
  85. GRB030324 optical observation
  86. GRB030131, BVRcIc field photometry
  87. Possible GRB030323 localized by INTEGRAL
  88. GRB030323: Detection on 2003/03/24
  89. IPN triangulation of GRB030326 (single small error box)
  90. IPN triangulation of GRB030325 (two small error boxes)
  91. GRB030323: V, R, I photometry
  92. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  93. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  94. VLT/FORS2 spectra of GRB 030323
  95. GRB030323, optical observations
  96. GRB030324, BVRcIc field photometry
  97. GRB030323, BVRcIc field calibration
  98. IPN triangulation of GRB030320 (small error box)
  99. Possible GRB 030320 localized by INTEGRAL
  100. IPN triangulation of GRB030306 (single small error box - REVISED)

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