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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"

27399 results found.

  1. GRB 030329: Optical Observations
  2. GRB 030528 (=H2724) Kyoto optical observation
  3. GRB 030416: Optical Observations
  4. GRB 030329 Optical Observations
  5. GRB030329: XMM-Newton observation
  6. GRB 021004: HST observations
  7. GRB030324: Further Observations of the Candidate Optical Afterglow
  8. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  9. IPN triangulation of GRB030519B=H2716 (small error box)
  10. HETE GRB030329, correction to Rc Observations in Loiano
  11. GRB 030329: Optical limit (contemporaneous imaging)
  12. IPN triangulation of GRB030509 (small errror box)
  13. GRB030329, BVRI photometry
  14. GRB030429, refiend optical brightness
  15. GRB 030329: Optical limit (contemporaneous photography)
  16. GRB030418, BVRcIc field photometry
  17. GRB030429, BVRcIc field photometry
  18. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  19. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  20. GRB030329: RTT150 optical observations and upper limit for a host
  21. GRB030501, optical observation
  22. GRB030501 triangulation (correction to GCN 2194)
  23. GRB030329: RTT150 optical observations and upper limit for a host
  24. GRB 030429: redshift from VLT spectroscopy
  25. GRB030501B triangulation (single error box)
  26. GRB 030329, BVRI photometry
  27. GRB030429: Optical Observations
  28. GRB030501: TAROT candidate afterglow present in archival images
  29. GRB 030429: confirmation of afterglow candidate
  30. GRB 030329 Oprical observations in Rozhen observatory
  31. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  32. IPN triangulation of GRB030425 (single error box)
  33. GRB 030329, the review of the sky area in plate archive (1950-1998)
  34. GRB 030329: optical spectropolarimetry at VLT
  35. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  36. GRB030329: optical polarization
  37. IPN triangulation of GRB030422 (two large error boxes)
  38. GRB030329, optical observation
  39. MASTER:optical observations GRB030418
  40. MASTER:optical observations probable GRB030414
  41. GRB030418: Kiso near infrared observations
  42. GRB 030418: Optical afterglow
  43. OT GRB 030329: early UBVRcIc spectral evolution
  44. OT GRB 030329: early spectrum
  45. IPN triangulation of GRB030414 (small error box)
  46. IPN triangulation of GRB030413 (small error box)
  47. Superluminal motion in GRB 030329 (Correction)
  48. Superluminal motion in GRB 030329
  49. GRB030329, optical position
  50. IPN triangulation of GRB030406 (small error box)
  51. IPN triangulation of GRB050403 (small error box)
  52. GRB 030329: BVRI photometry at Asiago
  53. GRB 030329: VLT V-band photometry
  54. Kiso observation of the GRB030329 at April 6
  55. GRB 030329, color evolution
  56. GRB030328, UBVRcIc field photometry
  57. GRB 030329 Optical observations
  58. GRB030329: Kiso B and R band observations
  59. GRB030328: R upper limit after 6 hours by MASTER
  60. SDSS 0.5m PT observations of GRB030329 (correction)
  61. SDSS 0.5m PT observations of GRB030329
  62. GRB030329: final R-band light curve by MASTER
  63. GRB030329, optical observation
  64. GRB030329, new UBVRcIc field photometry
  65. GRB 030329, light curve and SN prediction
  66. GRB 030329, BRI photometry
  67. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  68. GRB030329: Optical observations at Teramo
  69. GRB 030329: Radio observations at GMRT
  70. Further AAVSO V,B,R observations of GRB030329
  71. GRB 030329: Additional Mt. Laguna Optical Observations
  72. GRB 030329: Observations with ANDICAM
  73. GRB030329: further optical photometry and evidence for a light curve discontinuity
  74. triangulation of GRB 030331 (single error box)
  75. GRB 030329: optical observations
  76. Photometry of GRB030329 - Constant OT Magnitude
  77. GRB030329 - OT brightens
  78. GRB 030329, optical photometry
  79. GRB 030324: Optical and NIR Observations
  80. GRB030329: R band light curve by MASTER
  81. GRB030329 - Light curve flattening
  82. GRB 030324, optical search
  83. GRB 030329, optical observations
  84. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  85. GRB030329a: detection by Konus-Wind
  86. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  87. GRB030329, BVRcIc field photometry
  88. GRB030329, SPM optical observations
  89. GRB 030329: Optical decay and synthesis
  90. GRB030329 optical observations
  91. GRB 030329: Optical pre-Imaging
  92. GRB 030329: Upper limit from 5.6 hours before trigger
  93. GRB030328: X-ray Afterglow Observed with Chandra
  94. GRB 030329, R-band observations
  95. GRB 030329: OT B and R photometry, decline rate
  96. GRB030329: Upper limits from recent and historical observations.
  97. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  98. GRB 030329: Optical Afterglow Observations
  99. GRB 030328: optical observations
  100. GRB 030329: Optical afterglow fading

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