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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"

36073 results found.

  1. GRB030501B triangulation (single error box)
  2. GRB 030329 Optical Observations
  3. GRB 030329, BVRI photometry
  4. GRB 030501: TAROT possible candidate counterpart
  5. IPN triangulation of GRB030501 (IBIS event; annulus)
  6. IPN triangulation of GRB030501B (annulus)
  7. GRB 030429: confirmation of afterglow candidate
  8. GRB030429, possible optical counterpart
  9. GRB030501 localized by INTEGRAL
  10. GRB030425: CrAO optical observation
  11. IPN triangulation of GRB030429 (annulus)
  12. IPN triangulation of GRB030428 (two large error boxes)
  13. GRB 030329 Oprical observations in Rozhen observatory
  14. GRB 030429: ROTSE-III observations
  15. GRB 030324: Radio Observations
  16. GRB030329 observed as a sudden ionospheric disturbance (SID)
  17. IPN triangulation of GRB030426 (annulus)
  18. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  19. IPN triangulation of GRB030425 (single error box)
  20. GRB 030329, the review of the sky area in plate archive (1950-1998)
  21. GRB 030329: Spectral Evolution of SN 2003dh
  22. Optical Observations of GRB 030418 with Magellan
  23. GRB 030329: optical spectropolarimetry at VLT
  24. IPN triangulation of GRB030422C (annulus)
  25. IPN triangulation of GRB030422B (annulus)
  26. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  27. GRB030329: optical polarization
  28. IPN triangulation of GRB030422 (two large error boxes)
  29. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  30. IPN triangulation of GRB030421 (annulus)
  31. MASTER:optical observations GRB030418
  32. MASTER:optical observations probable GRB030414
  33. GRB030329: 444 AAVSO Measurements
  34. IPN triangulation of GRB030419 (annulus)
  35. MASTER:optical observations GRB030416
  36. ROTSE-III prompt optical detections of GRB 030418
  37. GRB030418: Upper limits from recent and historical observations.
  38. GRB030418: Kiso near infrared observations
  39. GRB 030418: Optical afterglow
  40. GRB 030418: Finder for afterglow candidate
  41. GRB 030418: Optical afterglow candidate
  42. GRB 030329 OT position
  43. OT GRB 030329: early UBVRcIc spectral evolution
  44. GRB030329, UBVRI polarimetry, R-polarization
  45. GRB 030329: SARA Optical Observations
  46. OT GRB 030329: early spectrum
  47. GRB030329: VR Photometry at TNG
  48. GRB030324: Candidate Optical Afterglow (Erratum)
  49. GRB030324: Candidate Optical Afterglow
  50. IPN triangulation of GRB030414 (small error box)
  51. GRB 030413: Optical Observations
  52. GRB 030329 Rc observations
  53. IPN triangulation of GRB030413 (small error box)
  54. IPN triangulation of GRB030410 (annulus)
  55. Superluminal motion in GRB 030329 (Correction)
  56. Superluminal motion in GRB 030329
  57. GRB 030329 and SN 2003dh
  58. GRB030329, optical position
  59. GRB 030329 VLBA Observations
  60. IPN triangulation of GRB030406 (small error box)
  61. IPN triangulation of GRB050403 (small error box)
  62. IPN triangulation of GRB030403 (annulus)
  63. GRB 030329: BVRI photometry at Asiago
  64. GRB 030329, light curve flattens
  65. GRB 030329: VLT V-band photometry
  66. If the SN/GRB connection confirmed
  67. GRB 030329: Supernova Confirmed
  68. GRB030329: RTT150 optical observations
  69. GRB030329: Near Infrared Observations at Gunma
  70. GRB030329: HET spectroscopic monitoring
  71. Kiso observation of the GRB030329 at April 6
  72. GRB 030329, color evolution
  73. GRB030328, UBVRcIc field photometry
  74. GRB 030329 Optical observations
  75. GRB 030329, color evolution
  76. GRB 030329: possible color change
  77. GRB030329: RTT150 optical observations
  78. GRB 030329: Supernova Spectrum Emerging
  79. GRB030329: Kiso B and R band observations
  80. GRB030329: RTT150 optical observation
  81. GRB030329: More AAVSO VR obs
  82. GRB030328: R upper limit after 6 hours by MASTER
  83. GRB 030329: BV photographic observations
  84. GRB 030329: SARA Optical Observations
  85. GRB 030329: SARA Optical Observations
  86. GRB030329, fading resumes
  87. GRB 030329, BVRI photometry
  88. SDSS 0.5m PT observations of GRB030329 (correction)
  89. SDSS 0.5m PT observations of GRB030329
  90. GRB 030329, Optical observations
  91. GRB 030329, nearby galaxies
  92. GRB030329, cessation of fading
  93. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  94. GRB 030329: Sub-millimeter detection
  95. GRB 030329: SARA Optical Observations
  96. GRB 030329: SARA Optical Observations
  97. OT GRB light curves and SN predictions
  98. GRB030329, optical observation
  99. GRB030329, new UBVRcIc field photometry
  100. GRB 030329, light curve and SN prediction

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