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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').
Advanced Search

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"

20362 results found.

  1. GRB 030429: confirmation of afterglow candidate
  2. GRB 030329 Oprical observations in Rozhen observatory
  3. IPN triangulation of GRB030425 (single error box)
  4. GRB030329, SPM optical observations (Correction)
  5. GRB030329, SPM optical observations
  6. GRB 030329, the review of the sky area in plate archive (1950-1998)
  7. GRB 030329: optical spectropolarimetry at VLT
  8. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  9. GRB030329: optical polarization
  10. IPN triangulation of GRB030422 (two large error boxes)
  11. MASTER:optical observations GRB030418
  12. MASTER:optical observations probable GRB030414
  13. GRB030418: Upper limits from recent and historical observations.
  14. GRB030418: Kiso near infrared observations
  15. OT GRB 030329: early spectrum
  16. GRB030329: VR Photometry at TNG
  17. IPN triangulation of GRB030414 (small error box)
  18. IPN triangulation of GRB030413 (small error box)
  19. GRB030329, optical position
  20. IPN triangulation of GRB030406 (small error box)
  21. IPN triangulation of GRB050403 (small error box)
  22. Kiso observation of the GRB030329 at April 6
  23. GRB030328, UBVRcIc field photometry
  24. GRB030329: BV photographic observations
  25. GRB 030329 Optical observations
  26. GRB030329: Kiso B and R band observations
  27. GRB030329: Optical observations
  28. SDSS 0.5m PT observations of GRB030329 (correction)
  29. SDSS 0.5m PT observations of GRB030329
  30. GRB030329: final R-band light curve by MASTER
  31. GRB030329, new UBVRcIc field photometry
  32. GRB030329: Optical observations at Teramo
  33. GRB 030329: Radio observations at GMRT
  34. GRB 030329: Additional Mt. Laguna Optical Observations
  35. GRB 030329: Observations with ANDICAM
  36. triangulation of GRB 030331 (single error box)
  37. GRB 030329: optical observations
  38. GRB 030329, optical spectroscopy
  39. GRB 030324: Optical and NIR Observations
  40. GRB030329: R band light curve by MASTER
  41. GRB030329 - Light curve flattening
  42. GRB 030324, optical search
  43. GRB 030329, optical observations
  44. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  45. GRB030329a: detection by Konus-Wind
  46. GRB 030329: Light curve observed during the change of its slope.
  47. GRB030329, BVRcIc field photometry
  48. GRB030329, SPM optical observations
  49. GRB 030329: Optical decay and synthesis
  50. GRB030329 optical observations
  51. GRB 030329: Optical pre-Imaging
  52. GRB 030329: Upper limit from 5.6 hours before trigger
  53. GRB030328: X-ray Afterglow Observed with Chandra
  54. GRB 030329, R-band observations
  55. GRB030329: Upper limits from recent and historical observations.
  56. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  57. GRB 030329: Optical Afterglow Observations
  58. GRB 030328: optical observations
  59. GRB 030329: Optical afterglow fading
  60. GRB 030328: OT photometry
  61. GRB030328: optical photometry at the TNG
  62. GRB 030328: Optical observations
  63. GRB030324 optical observation
  64. GRB030131, BVRcIc field photometry
  65. Possible GRB030323 localized by INTEGRAL
  66. GRB030323: Detection on 2003/03/24
  67. IPN triangulation of GRB030326 (single small error box)
  68. IPN triangulation of GRB030325 (single small error box)
  69. IPN triangulation of GRB030325 (two small error boxes)
  70. GRB030323: V, R, I photometry
  71. GRB030324, Optical Observations
  72. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  73. VLT/FORS2 spectra of GRB 030323
  74. GRB030323, optical observations
  75. GRB030324, BVRcIc field photometry
  76. GRB030323, BVRcIc field calibration
  77. IPN triangulation of GRB030320 (small error box)
  78. Possible GRB 030320 localized by INTEGRAL
  79. IPN triangulation of GRB030306 (single small error box - REVISED)
  80. IPN triangulation of GRB030306 (single small error box)
  81. IPN triangulation of GRB030306 (two small error boxes)
  82. GRB030226, BVRc observations
  83. Chandra detection of the X-ray afterglow of GRB 030226
  84. GRB 030226, further optical/NIR imaging
  85. GRB030227: Kiso optical upper limit
  86. GRB030227, BVRcIc field photometry
  87. GRB030226, BVRcIc field calibration
  88. GRB 030228, optical observations
  89. GRB 030226: Steep Decline
  90. GRB 030227: Confirmed Optical Afterglow (S1-A)
  91. GRB 030227: fading of candidate optical afterglow 'S1-A'
  92. GRB030227:Optical observations
  93. GRB 030227, possible optical counterpart of XMM-Newton source
  94. GRB030227: Kiso optical observations
  95. GRB 030227: Kyoto optical observation
  96. GRB030227 localized by INTEGRAL
  97. GRB 030226 : Predicted light curve
  98. GRB030226: ESI spectroscopy
  99. GRB 030226 simultaneous optical observations
  100. GRB 030226, optical observations

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