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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"

24870 results found.

  1. GRB 030329 Oprical observations in Rozhen observatory
  2. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  3. IPN triangulation of GRB030425 (single error box)
  4. GRB 030329, the review of the sky area in plate archive (1950-1998)
  5. GRB 030329: optical spectropolarimetry at VLT
  6. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  7. GRB030329: optical polarization
  8. IPN triangulation of GRB030422 (two large error boxes)
  9. GRB030329, optical observation
  10. MASTER:optical observations GRB030418
  11. MASTER:optical observations probable GRB030414
  12. GRB030418: Kiso near infrared observations
  13. GRB 030418: Optical afterglow
  14. OT GRB 030329: early UBVRcIc spectral evolution
  15. OT GRB 030329: early spectrum
  16. IPN triangulation of GRB030414 (small error box)
  17. IPN triangulation of GRB030413 (small error box)
  18. Superluminal motion in GRB 030329 (Correction)
  19. Superluminal motion in GRB 030329
  20. GRB030329, optical position
  21. IPN triangulation of GRB030406 (small error box)
  22. IPN triangulation of GRB050403 (small error box)
  23. GRB 030329: BVRI photometry at Asiago
  24. GRB 030329: VLT V-band photometry
  25. Kiso observation of the GRB030329 at April 6
  26. GRB 030329, color evolution
  27. GRB030328, UBVRcIc field photometry
  28. GRB 030329 Optical observations
  29. GRB030329: Kiso B and R band observations
  30. GRB030328: R upper limit after 6 hours by MASTER
  31. SDSS 0.5m PT observations of GRB030329 (correction)
  32. SDSS 0.5m PT observations of GRB030329
  33. GRB030329: final R-band light curve by MASTER
  34. GRB030329, optical observation
  35. GRB030329, new UBVRcIc field photometry
  36. GRB 030329, light curve and SN prediction
  37. GRB 030329, BRI photometry
  38. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  39. GRB030329: Optical observations at Teramo
  40. GRB 030329: Radio observations at GMRT
  41. Further AAVSO V,B,R observations of GRB030329
  42. GRB 030329: Additional Mt. Laguna Optical Observations
  43. GRB 030329: Observations with ANDICAM
  44. GRB030329: further optical photometry and evidence for a light curve discontinuity
  45. triangulation of GRB 030331 (single error box)
  46. GRB 030329: optical observations
  47. Photometry of GRB030329 - Constant OT Magnitude
  48. GRB030329 - OT brightens
  49. GRB 030329, optical photometry
  50. GRB 030324: Optical and NIR Observations
  51. GRB030329: R band light curve by MASTER
  52. GRB030329 - Light curve flattening
  53. GRB 030324, optical search
  54. GRB 030329, optical observations
  55. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  56. GRB030329a: detection by Konus-Wind
  57. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  58. GRB030329, BVRcIc field photometry
  59. GRB030329, SPM optical observations
  60. GRB 030329: Optical decay and synthesis
  61. GRB030329 optical observations
  62. GRB 030329: Optical pre-Imaging
  63. GRB 030329: Upper limit from 5.6 hours before trigger
  64. GRB030328: X-ray Afterglow Observed with Chandra
  65. GRB 030329, R-band observations
  66. GRB 030329: OT B and R photometry, decline rate
  67. GRB030329: Upper limits from recent and historical observations.
  68. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  69. GRB 030329: Optical Afterglow Observations
  70. GRB 030328: optical observations
  71. GRB 030329: Optical afterglow fading
  72. GRB 030328: OT photometry
  73. GRB030328: optical spectroscopy at TNG
  74. GRB030328: optical photometry at the TNG
  75. VLT spectra of GRB 030328
  76. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  77. GRB 030328: Optical observations
  78. GRB030324 optical observation
  79. GRB030131, BVRcIc field photometry
  80. Possible GRB030323 localized by INTEGRAL
  81. GRB030323: Detection on 2003/03/24
  82. IPN triangulation of GRB030326 (single small error box)
  83. IPN triangulation of GRB030325 (two small error boxes)
  84. GRB030323: V, R, I photometry
  85. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  86. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  87. VLT/FORS2 spectra of GRB 030323
  88. GRB030323, optical observations
  89. GRB030324, BVRcIc field photometry
  90. GRB030323, BVRcIc field calibration
  91. IPN triangulation of GRB030320 (small error box)
  92. Possible GRB 030320 localized by INTEGRAL
  93. IPN triangulation of GRB030306 (single small error box - REVISED)
  94. IPN triangulation of GRB030306 (single small error box)
  95. IPN triangulation of GRB030306 (two small error boxes)
  96. GRB030226, BVRc observations
  97. Chandra detection of the X-ray afterglow of GRB 030226
  98. GRB030227: Kiso optical upper limit
  99. GRB030227, BVRcIc field photometry
  100. GRB030226, BVRcIc field calibration

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