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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"

42572 results found.

  1. GRB 030528: Optical observations at RIKEN
  2. GRB 030528 (=H2724) Kyoto optical observation
  3. IPN triangulation of GRB030523B (annulus)
  4. GRB 030416: Optical Observations
  5. GRB 030329: Planned XMM-Newton Observation
  6. IPN triangulation of GRB030523 (annulus)
  7. GRB 030329: optical photometry at various french observatories
  8. GRB 030329: optical photometry at Belesta observatory (France)
  9. GRB030329, Optical observations
  10. GRB 030329/SN 2003dh: Possible increase in brightness
  11. GRB 030329: HST ACS Observations of the Host
  12. GRB 030329 Optical Observations
  13. GRB030329: XMM-Newton observation
  14. GRB 021004: HST observations
  15. GRB030324: Further Observations of the Candidate Optical Afterglow
  16. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  17. IPN triangulation of GRB030519B=H2716 (small error box)
  18. GRB 030418: Second Epoch Optical Observations with Magellan
  19. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  20. IPN triangulation of GRB030519 (annulus)
  21. IPN triangulation of GRB030518C (annulus)
  22. IPN triangulation of GRB030518B (annulus)
  23. IPN triangulation of GRB030518A (annulus)
  24. IPN triangulation of GRB030514 (annulus)
  25. HETE GRB030329, correction to Rc Observations in Loiano
  26. IPN triangulation of GRB030513 (annulus)
  27. IPN triangulation of GRB030509B (annulus)
  28. GRB 030329: Optical limit (contemporaneous imaging)
  29. GRB 030501: final TAROT limits
  30. IPN triangulation of GRB030509 (small errror box)
  31. IPN triangulation of GRB030509 (single error box)
  32. GRB030329: RTT150 optical observations
  33. GRB030329, BVRI photometry
  34. GRB030429, refiend optical brightness
  35. GRB 030329: Optical limit (contemporaneous photography)
  36. GRB030418, BVRcIc field photometry
  37. GRB 030429: Redshift of neighbor galaxy
  38. GRB030429, BVRcIc field photometry
  39. GRB030429: RTT150 optical obs., correction to GCN 2208
  40. GRB 030329: High-Resolution Spectroscopy of the Host
  41. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  42. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  43. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  44. GRB030429: RTT150 optical observations, a possible host galaxy
  45. IPN triangulation of GRB030506 (annulus)
  46. IPN triangulation of GRB030505B (large error box)
  47. IPN triangulation of GRB030505A (annulus)
  48. GRB030329: RTT150 optical observations and upper limit for a host
  49. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  50. GRB030501 observation report
  51. GRB030501C triangulation (annulus)
  52. GRB030329: RTT150 optical observations and upper limit for a host
  53. GRB 030429: Radio Observations
  54. GRB 030429: redshift from VLT spectroscopy
  55. GRB030501B triangulation (single error box)
  56. GRB 030329 Optical Observations
  57. GRB030328, optical observation
  58. GRB 030329, BVRI photometry
  59. GRB030429: Optical Observations
  60. GRB030501: TAROT candidate afterglow present in archival images
  61. GRB 030501: TAROT possible candidate counterpart
  62. IPN triangulation of GRB030501 (IBIS event; annulus)
  63. IPN triangulation of GRB030501B (annulus)
  64. GRB 030429: confirmation of afterglow candidate
  65. GRB030429, possible optical counterpart
  66. GRB030501 localized by INTEGRAL
  67. GRB030425: CrAO optical observation
  68. IPN triangulation of GRB030429 (annulus)
  69. IPN triangulation of GRB030428 (two large error boxes)
  70. GRB 030429: ROTSE-III observations
  71. GRB 030324: Radio Observations
  72. GRB030329 observed as a sudden ionospheric disturbance (SID)
  73. IPN triangulation of GRB030426 (annulus)
  74. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  75. IPN triangulation of GRB030425 (single error box)
  76. GRB030329, SPM optical observations (Correction)
  77. GRB030329, SPM optical observations
  78. GRB 030329: Spectral Evolution of SN 2003dh
  79. Optical Observations of GRB 030418 with Magellan
  80. GRB 030329: optical spectropolarimetry at VLT
  81. IPN triangulation of GRB030422C (annulus)
  82. IPN triangulation of GRB030422B (annulus)
  83. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  84. GRB030329: optical polarization
  85. IPN triangulation of GRB030422 (two large error boxes)
  86. GRB030329, optical observation
  87. IPN triangulation of GRB030421 (annulus)
  88. MASTER:optical observations GRB030418
  89. MASTER:optical observations probable GRB030414
  90. GRB030329: 444 AAVSO Measurements
  91. IPN triangulation of GRB030419 (annulus)
  92. MASTER:optical observations GRB030416
  93. ROTSE-III prompt optical detections of GRB 030418
  94. GRB030418: Upper limits from recent and historical observations.
  95. GRB 030418: Finder for afterglow candidate
  96. GRB 030418: Optical afterglow candidate
  97. GRB 030329 OT position
  98. GRB030329: Optical Observations
  99. OT GRB 030329: early UBVRcIc spectral evolution
  100. GRB030329, UBVRI polarimetry, R-polarization

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