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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"

11753 results found.

  1. GRB 031203: A long GRB detected with INTEGRAL
  2. IPN/HETE localization of GRB031109 (=H2917; large error box)
  3. IPN detection of activity from SGR1806-20
  4. IPN triangulation of GRB031107 (two large error boxes)
  5. HETE Prompt GRB Spectral Analyses
  6. XRF031109 (=H2919): A very long XRF localized by HETE
  7. Lulin optical follow-up observations of GRB031026
  8. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  9. IBAS alert 1180 refers to a burst from SGR 1806-20
  10. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  11. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  12. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  13. IPN detection of continued activity from SGR1806-20
  14. A burst from SGR 1806-20 detected with IBAS
  15. IPN triangulation of GRB030922B (large error box)
  16. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  17. IPN triangulation of GRB030921 (large error box)
  18. IPN triangulation of GRB030919 (large error box)
  19. GRB 030913, optical candidate
  20. GRB030913: AAVSO optical observations
  21. GRB030913 (=H2849): TAROT Observations
  22. XRF030824: Optical observations
  23. IPN triangulation of GRB030903 (large error box)
  24. IBAS detection of bursts from SGR 1806-20
  25. Radio Observations of SGR1806-20
  26. IPN triangulation of GRB030831 (annulus)
  27. IPN triangulation of GRB030830 (large error box)
  28. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  29. Summary of recent IPN and HETE detections of SGR bursts
  30. Clarification of GCN 2354 on SGR1806-20
  31. IPN detection of continued activity from SGR1806-20
  32. 030813 SGR event (Konus-Wind observation)
  33. SGR 1808-20 (=H2802): A Possible new SGR
  34. IPN triangulation of GRB030806 (large burst; large error box)
  35. IPN/HETE summary of recent bursts from SGR1806-20
  36. GRB030725, optical transient observations
  37. GRB030723: Upper limits from historical observations
  38. GRB030725, possible optical transient
  39. XRF030723, BVRcIc field photometry correction
  40. XRF030723, ROTSE-III Early Observations
  41. Konus-Wind detection of the bursts from SGR1806-20 region
  42. SGR 1806-20, submm observations
  43. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  44. IPN triangulation of GRB030717 (annulus)
  45. RXTE PCA Observations of SGR1806-20 Region
  46. Triangulation of GRB030715 (single large error box)
  47. IPN triangulation of GRB030714 (two large error boxes)
  48. IPN triangulation of GRB030715 (two large error boxes)
  49. IPN detection of renewed activity from SGR1806-20
  50. IPN triangulation of GRB030629 (annulus)
  51. GRB030329: second XMM-Newton observation
  52. GRB030418: R optical observations
  53. HETE detection of burst from SGR1806-20
  54. GRB030329 -- RATAN-600 data in April-May
  55. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  56. IPN triangulation of GRB030606 (two alternate error boxes)
  57. GRB 030528: tentative NIR counterpart
  58. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  59. IPN triangulation of GRB030601 (annulus)
  60. GRB030329, SPM optical observations
  61. GRB 030329: optical observations
  62. GRB 030329/SN 2003dh: Jitter Episode
  63. GRB 030329: optical photometry at various french observatories
  64. GRB030329, Optical observations
  65. GRB 030329/SN 2003dh: Possible increase in brightness
  66. GRB030329: XMM-Newton observation
  67. GRB030429, refiend optical brightness
  68. GRB 030329: Optical limit (contemporaneous photography)
  69. GRB030501C triangulation (annulus)
  70. GRB 030329 Optical Observations
  71. GRB 030329, BVRI photometry
  72. GRB030429: Optical Observations
  73. GRB 030501: TAROT possible candidate counterpart
  74. GRB030429, possible optical counterpart
  75. GRB 030429: ROTSE-III observations
  76. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  77. GRB 030329, the review of the sky area in plate archive (1950-1998)
  78. GRB030329, optical observation
  79. MASTER:optical observations GRB030418
  80. MASTER:optical observations probable GRB030414
  81. ROTSE-III prompt optical detections of GRB 030418
  82. GRB030329: VR Photometry at TNG
  83. IPN triangulation of GRB030413 (small error box)
  84. IPN triangulation of GRB030406 (small error box)
  85. GRB030329: BV photographic observations
  86. GRB030329: RTT150 optical observations
  87. GRB030329: Kiso B and R band observations
  88. GRB 030329: BV photographic observations
  89. GRB 030329, BVRI photometry
  90. GRB030329: final R-band light curve by MASTER
  91. GRB030329 - more 15 GHz radio data
  92. OT GRB light curves and SN predictions
  93. GRB 030329, BRI photometry
  94. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  95. Further AAVSO V,B,R observations of GRB030329
  96. GRB 030329: Additional Mt. Laguna Optical Observations
  97. GRB030329: further optical photometry and evidence for a light curve discontinuity
  98. GRB030329 - OT rebrightens
  99. AAVSO V & R observations of GRB030329
  100. GRB 030329: optical observations

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