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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"

20363 results found.

  1. GRB030501: TAROT candidate afterglow present in archival images
  2. GRB 030429: confirmation of afterglow candidate
  3. GRB 030329 Oprical observations in Rozhen observatory
  4. IPN triangulation of GRB030425 (single error box)
  5. GRB030329, SPM optical observations (Correction)
  6. GRB030329, SPM optical observations
  7. GRB 030329, the review of the sky area in plate archive (1950-1998)
  8. GRB 030329: optical spectropolarimetry at VLT
  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. MASTER:optical observations GRB030418
  13. MASTER:optical observations probable GRB030414
  14. GRB030418: Upper limits from recent and historical observations.
  15. GRB030418: Kiso near infrared observations
  16. OT GRB 030329: early spectrum
  17. GRB030329: VR Photometry at TNG
  18. IPN triangulation of GRB030414 (small error box)
  19. IPN triangulation of GRB030413 (small error box)
  20. GRB030329, optical position
  21. IPN triangulation of GRB030406 (small error box)
  22. IPN triangulation of GRB050403 (small error box)
  23. Kiso observation of the GRB030329 at April 6
  24. GRB030328, UBVRcIc field photometry
  25. GRB030329: BV photographic observations
  26. GRB 030329 Optical observations
  27. GRB030329: Kiso B and R band observations
  28. GRB030329: Optical observations
  29. SDSS 0.5m PT observations of GRB030329 (correction)
  30. SDSS 0.5m PT observations of GRB030329
  31. GRB030329: final R-band light curve by MASTER
  32. GRB030329, new UBVRcIc field photometry
  33. GRB030329: Optical observations at Teramo
  34. GRB 030329: Radio observations at GMRT
  35. GRB 030329: Additional Mt. Laguna Optical Observations
  36. GRB 030329: Observations with ANDICAM
  37. triangulation of GRB 030331 (single error box)
  38. GRB 030329: optical observations
  39. GRB 030329, optical spectroscopy
  40. GRB 030324: Optical and NIR Observations
  41. GRB030329: R band light curve by MASTER
  42. GRB030329 - Light curve flattening
  43. GRB 030324, optical search
  44. GRB 030329, optical observations
  45. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  46. GRB030329a: detection by Konus-Wind
  47. GRB 030329: Light curve observed during the change of its slope.
  48. GRB030329, BVRcIc field photometry
  49. GRB030329, SPM optical observations
  50. GRB 030329: Optical decay and synthesis
  51. GRB030329 optical observations
  52. GRB 030329: Optical pre-Imaging
  53. GRB 030329: Upper limit from 5.6 hours before trigger
  54. GRB030328: X-ray Afterglow Observed with Chandra
  55. GRB 030329, R-band observations
  56. GRB030329: Upper limits from recent and historical observations.
  57. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  58. GRB 030329: Optical Afterglow Observations
  59. GRB 030328: optical observations
  60. GRB 030329: Optical afterglow fading
  61. GRB 030328: OT photometry
  62. GRB030328: optical photometry at the TNG
  63. GRB 030328: Optical observations
  64. GRB030324 optical observation
  65. GRB030131, BVRcIc field photometry
  66. Possible GRB030323 localized by INTEGRAL
  67. GRB030323: Detection on 2003/03/24
  68. IPN triangulation of GRB030326 (single small error box)
  69. IPN triangulation of GRB030325 (single small error box)
  70. IPN triangulation of GRB030325 (two small error boxes)
  71. GRB030323: V, R, I photometry
  72. GRB030324, Optical Observations
  73. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  74. VLT/FORS2 spectra of GRB 030323
  75. GRB030323, optical observations
  76. GRB030324, BVRcIc field photometry
  77. GRB030323, BVRcIc field calibration
  78. IPN triangulation of GRB030320 (small error box)
  79. Possible GRB 030320 localized by INTEGRAL
  80. IPN triangulation of GRB030306 (single small error box - REVISED)
  81. IPN triangulation of GRB030306 (single small error box)
  82. IPN triangulation of GRB030306 (two small error boxes)
  83. GRB030226, BVRc observations
  84. Chandra detection of the X-ray afterglow of GRB 030226
  85. GRB 030226, further optical/NIR imaging
  86. GRB030227: Kiso optical upper limit
  87. GRB030227, BVRcIc field photometry
  88. GRB030226, BVRcIc field calibration
  89. GRB 030228, optical observations
  90. GRB 030226: Steep Decline
  91. GRB 030227: Confirmed Optical Afterglow (S1-A)
  92. GRB 030227: fading of candidate optical afterglow 'S1-A'
  93. GRB030227:Optical observations
  94. GRB 030227, possible optical counterpart of XMM-Newton source
  95. GRB030227: Kiso optical observations
  96. GRB 030227: Kyoto optical observation
  97. GRB030227 localized by INTEGRAL
  98. GRB 030226 : Predicted light curve
  99. GRB030226: ESI spectroscopy
  100. GRB 030226 simultaneous optical observations

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