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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"

4252 results found.

  1. GRB031220: observation at Univercity of Miyazaki
  2. GRB 031220: Optical observation at Tokyo Tech
  3. GRB 031203: Discovery of a dust echo
  4. GRB031203: K' Photometry of the likely GRB host
  5. XRF031109 (=H2919): A very long XRF localized by HETE
  6. IPN triangulation of GRB031026B (large error box)
  7. IBAS alert 1180 refers to a burst from SGR 1806-20
  8. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  9. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  10. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  11. XRF 030723: Subaru Optical Observations
  12. A burst from SGR 1806-20 detected with IBAS
  13. IPN triangulation of GRB030926 (short/hard; large error box)
  14. GRB030913: AAVSO optical observations
  15. IBAS detection of bursts from SGR 1806-20
  16. Radio Observations of SGR1806-20
  17. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  18. Summary of recent IPN and HETE detections of SGR bursts
  19. Clarification of GCN 2354 on SGR1806-20
  20. IPN detection of continued activity from SGR1806-20
  21. 030813 SGR event (Konus-Wind observation)
  22. SGR 1808-20 (=H2802): A Possible new SGR
  23. IPN triangulation of GRB030721 (large error box)
  24. GRB030723: Upper limits from historical observations
  25. XRF030723, optical observations
  26. SGR 1806-20, submm observations
  27. RXTE PCA Observations of SGR1806-20 Region
  28. IPN triangulation of GRB030715 (two large error boxes)
  29. GRB030329: RTT150 optical observations
  30. GRB030329, optical observation in May
  31. HETE detection of burst from SGR1806-20
  32. IPN triangulation of GRB030606 (two alternate error boxes)
  33. GRB 030528: tentative NIR counterpart
  34. GRB 030329/SN 2003dh: Jitter Episode
  35. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  36. GRB 030329: Optical limit (contemporaneous imaging)
  37. IPN triangulation of GRB030509 (single error box)
  38. GRB030429, refiend optical brightness
  39. GRB 030329: Optical limit (contemporaneous photography)
  40. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  41. GRB 030329 Optical Observations
  42. GRB030328, optical observation
  43. GRB030429: Optical Observations
  44. GRB030329 observed as a sudden ionospheric disturbance (SID)
  45. OT GRB 030329: early UBVRcIc spectral evolution
  46. GRB030329, UBVRI polarimetry, R-polarization
  47. OT GRB 030329: early spectrum
  48. IPN triangulation of GRB030413 (small error box)
  49. GRB030329: Near Infrared Observations at Gunma
  50. GRB030329: Kiso B and R band observations
  51. GRB030328: R upper limit after 6 hours by MASTER
  52. GRB030329: final R-band light curve by MASTER
  53. GRB030329: optical observations at Tokyo Tech
  54. Further AAVSO V,B,R observations of GRB030329
  55. GRB 030329: Additional Mt. Laguna Optical Observations
  56. GRB 030329: Observations with ANDICAM
  57. GRB030329: Optical observations
  58. GRB 030329: Correction to GCN 2056
  59. GRB 030329: optical observations
  60. GRB 030328, optical photometry
  61. GRB030329: R band light curve by MASTER
  62. GRB030329 - near contemporaneous optical limits from CONCAM
  63. GRB 030329: Optical pre-Imaging
  64. GRB 030329: visual observations
  65. GRB 030329: OT B and R photometry, decline rate
  66. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  67. RXTE detection of GRB 030329 afterglow
  68. GRB 030329: Optical Afterglow Observations
  69. GRB 030328 Optical Observations
  70. GRB030328: Decay index
  71. GRB 030329: OT candidate
  72. GRB030328: optical spectroscopy at TNG
  73. GRB030328: optical photometry at the TNG
  74. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  75. IPN triangulation of GRB030326 (single small error box)
  76. GRB 030323: SARA Optical Observations
  77. IPN triangulation of GRB030325 (two small error boxes)
  78. GRB030323: V, R, I photometry
  79. GRB 030227: fading of candidate optical afterglow 'S1-A'
  80. GRB 030227, possible optical counterpart of XMM-Newton source
  81. GRB030227 - faint tentative OT candidate
  82. XMM-Newton observation of GRB030227
  83. GRB 030227: Kyoto optical observation
  84. GRB030227: refined INTEGRAL position
  85. GRB 030131: marginal optical detection
  86. Probable GRB030112 seen by SPI ACS
  87. VLT spectroscopy of the probable host of GRB 021211
  88. IPN triangulation of GRB021219
  89. IPN detection of continued activity from SGR1806-20
  90. IPN triangulation of GRB021211B (two large error boxes)
  91. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  92. IPN detection of renewed activity from SGR1806-20
  93. GRB 021201: BOOTES simultaneous optical observations
  94. GRB021004, late time optical observations
  95. IPN detection of continued SGR1900+14 activity
  96. IPN confirmation of the reactivation of SGR1900+14
  97. IPN detection of possible reactivation of SGR1900+14
  98. GRB 021113: Evidence for a Dark Optical Afterglow
  99. GRB 021112: RAPTOR Observations
  100. GRB021112 (=H2448): A Long GRB Localized by HETE

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