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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"

4169 results found.

  1. XRF040701: Second-Epoch Chandra Observations
  2. XRF040701: First-Epoch Chandra Observations
  3. GRB040709 J,H-band observations
  4. GRB040706:observation at University of Miyazaki
  5. IPN Summary of SGR1806-20 Activity in 2004
  6. SGR 1806-20: no IR variability of the proposed counterparts
  7. SGR 1806-20, potential NIR counterpart
  8. MASTER: HETE Alert 3274 optical observation
  9. Activivty of SGR 1806-20
  10. IBAS GRB Alerts n.1785 to 1791
  11. GRB 040422: a long GRB detected with INTEGRAL
  12. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  13. IBAS GRB Alert 1694
  14. short hard GRB 040322
  15. IBAS GRB alerts 1679, 1680, 1681
  16. IBAS results on a burst from SGR1806-20
  17. RXTE GRB040229 optical observation: no candidate
  18. GRB031220: observation at Univercity of Miyazaki
  19. GRB 031220: Optical observation at Tokyo Tech
  20. GRB 031203: Discovery of a dust echo
  21. GRB031203: K' Photometry of the likely GRB host
  22. XRF031109 (=H2919): A very long XRF localized by HETE
  23. IPN triangulation of GRB031026B (large error box)
  24. IBAS alert 1180 refers to a burst from SGR 1806-20
  25. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  26. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  27. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  28. XRF 030723: Subaru Optical Observations
  29. A burst from SGR 1806-20 detected with IBAS
  30. IPN triangulation of GRB030926 (short/hard; large error box)
  31. GRB030913: AAVSO optical observations
  32. IBAS detection of bursts from SGR 1806-20
  33. Radio Observations of SGR1806-20
  34. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  35. Summary of recent IPN and HETE detections of SGR bursts
  36. Clarification of GCN 2354 on SGR1806-20
  37. IPN detection of continued activity from SGR1806-20
  38. 030813 SGR event (Konus-Wind observation)
  39. SGR 1808-20 (=H2802): A Possible new SGR
  40. IPN triangulation of GRB030721 (large error box)
  41. GRB030723: Upper limits from historical observations
  42. XRF030723, optical observations
  43. SGR 1806-20, submm observations
  44. RXTE PCA Observations of SGR1806-20 Region
  45. IPN triangulation of GRB030715 (two large error boxes)
  46. GRB030329: RTT150 optical observations
  47. GRB030329, optical observation in May
  48. HETE detection of burst from SGR1806-20
  49. IPN triangulation of GRB030606 (two alternate error boxes)
  50. GRB 030528: tentative NIR counterpart
  51. GRB 030329/SN 2003dh: Jitter Episode
  52. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  53. GRB 030329: Optical limit (contemporaneous imaging)
  54. IPN triangulation of GRB030509 (single error box)
  55. GRB030429, refiend optical brightness
  56. GRB 030329: Optical limit (contemporaneous photography)
  57. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  58. GRB 030329 Optical Observations
  59. GRB030328, optical observation
  60. GRB030429: Optical Observations
  61. GRB030329 observed as a sudden ionospheric disturbance (SID)
  62. OT GRB 030329: early UBVRcIc spectral evolution
  63. GRB030329, UBVRI polarimetry, R-polarization
  64. OT GRB 030329: early spectrum
  65. IPN triangulation of GRB030413 (small error box)
  66. GRB030329: Near Infrared Observations at Gunma
  67. GRB030329: Kiso B and R band observations
  68. GRB030328: R upper limit after 6 hours by MASTER
  69. GRB030329: final R-band light curve by MASTER
  70. GRB030329: optical observations at Tokyo Tech
  71. Further AAVSO V,B,R observations of GRB030329
  72. GRB 030329: Additional Mt. Laguna Optical Observations
  73. GRB 030329: Observations with ANDICAM
  74. GRB030329: Optical observations
  75. GRB 030329: Correction to GCN 2056
  76. GRB 030329: optical observations
  77. GRB 030328, optical photometry
  78. GRB030329: R band light curve by MASTER
  79. GRB030329 - near contemporaneous optical limits from CONCAM
  80. GRB 030329: Optical pre-Imaging
  81. GRB 030329: visual observations
  82. GRB 030329: OT B and R photometry, decline rate
  83. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  84. RXTE detection of GRB 030329 afterglow
  85. GRB 030329: Optical Afterglow Observations
  86. GRB 030328 Optical Observations
  87. GRB030328: Decay index
  88. GRB 030329: OT candidate
  89. GRB030328: optical spectroscopy at TNG
  90. GRB030328: optical photometry at the TNG
  91. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  92. IPN triangulation of GRB030326 (single small error box)
  93. GRB 030323: SARA Optical Observations
  94. IPN triangulation of GRB030325 (two small error boxes)
  95. GRB030323: V, R, I photometry
  96. GRB 030227: fading of candidate optical afterglow 'S1-A'
  97. GRB 030227, possible optical counterpart of XMM-Newton source
  98. GRB030227 - faint tentative OT candidate
  99. XMM-Newton observation of GRB030227
  100. GRB 030227: Kyoto optical observation

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