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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"

37956 results found.

  1. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  2. IPN triangulation of GRB030425 (single error box)
  3. GRB 030329, the review of the sky area in plate archive (1950-1998)
  4. GRB 030329: Spectral Evolution of SN 2003dh
  5. Optical Observations of GRB 030418 with Magellan
  6. GRB 030329: optical spectropolarimetry at VLT
  7. IPN triangulation of GRB030422C (annulus)
  8. IPN triangulation of GRB030422B (annulus)
  9. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  10. GRB030329: optical polarization
  11. IPN triangulation of GRB030422 (two large error boxes)
  12. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  13. IPN triangulation of GRB030421 (annulus)
  14. MASTER:optical observations GRB030418
  15. MASTER:optical observations probable GRB030414
  16. GRB030329: 444 AAVSO Measurements
  17. IPN triangulation of GRB030419 (annulus)
  18. MASTER:optical observations GRB030416
  19. ROTSE-III prompt optical detections of GRB 030418
  20. GRB030418: Upper limits from recent and historical observations.
  21. GRB030418: Kiso near infrared observations
  22. GRB 030418: Optical afterglow
  23. GRB 030418: Finder for afterglow candidate
  24. GRB 030418: Optical afterglow candidate
  25. GRB 030329 OT position
  26. OT GRB 030329: early UBVRcIc spectral evolution
  27. GRB030329, UBVRI polarimetry, R-polarization
  28. GRB 030329: SARA Optical Observations
  29. OT GRB 030329: early spectrum
  30. GRB030329: VR Photometry at TNG
  31. GRB030324: Candidate Optical Afterglow (Erratum)
  32. GRB030324: Candidate Optical Afterglow
  33. IPN triangulation of GRB030414 (small error box)
  34. GRB 030413: Optical Observations
  35. GRB 030329 Rc observations
  36. IPN triangulation of GRB030413 (small error box)
  37. IPN triangulation of GRB030410 (annulus)
  38. Superluminal motion in GRB 030329 (Correction)
  39. Superluminal motion in GRB 030329
  40. GRB 030329 and SN 2003dh
  41. GRB030329, optical position
  42. GRB 030329 VLBA Observations
  43. IPN triangulation of GRB030406 (small error box)
  44. IPN triangulation of GRB050403 (small error box)
  45. IPN triangulation of GRB030403 (annulus)
  46. GRB 030329: BVRI photometry at Asiago
  47. GRB 030329, light curve flattens
  48. GRB 030329: VLT V-band photometry
  49. If the SN/GRB connection confirmed
  50. GRB 030329: Supernova Confirmed
  51. GRB030329: RTT150 optical observations
  52. GRB030329: Near Infrared Observations at Gunma
  53. GRB030329: HET spectroscopic monitoring
  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. GRB 030329, color evolution
  59. GRB 030329: possible color change
  60. GRB030329: RTT150 optical observations
  61. GRB 030329: Supernova Spectrum Emerging
  62. GRB030329: Kiso B and R band observations
  63. GRB030329: RTT150 optical observation
  64. GRB030329: More AAVSO VR obs
  65. GRB030328: R upper limit after 6 hours by MASTER
  66. GRB 030329: BV photographic observations
  67. GRB 030329: SARA Optical Observations
  68. GRB 030329: SARA Optical Observations
  69. GRB030329, fading resumes
  70. GRB 030329, BVRI photometry
  71. SDSS 0.5m PT observations of GRB030329 (correction)
  72. SDSS 0.5m PT observations of GRB030329
  73. GRB 030329, Optical observations
  74. GRB 030329, nearby galaxies
  75. GRB030329, cessation of fading
  76. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  77. GRB 030329: Sub-millimeter detection
  78. GRB 030329: SARA Optical Observations
  79. GRB 030329: SARA Optical Observations
  80. OT GRB light curves and SN predictions
  81. GRB030329, optical observation
  82. GRB030329, new UBVRcIc field photometry
  83. GRB 030329, light curve and SN prediction
  84. GRB030329: optical observations at Tokyo Tech
  85. GRB 030329: optical observations
  86. GRB030329: multiple re-brightening phases
  87. GRB 030329, BRI photometry
  88. GRB 030329 , SPM optical observations
  89. GRB 030329: Radio observations at GMRT
  90. Further AAVSO V,B,R observations of GRB030329
  91. GRB 030329: Additional Mt. Laguna Optical Observations
  92. GRB 030329: SARA Optical Observations
  93. GRB 030329: Observations with ANDICAM
  94. GRB030329: further optical photometry and evidence for a light curve discontinuity
  95. GRB 030329: Correction to GCN 2056
  96. GRB 030329: fitting parameters and re-brightening
  97. GRB 030329: KAIT optical photometry
  98. GRB030329 Further RBO Optical Observations
  99. triangulation of GRB 030331 (single error box)
  100. GRB030329 - OT rebrightens

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