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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"

28050 results found.

  1. IPN triangulation of GRB030903 (large error box)
  2. IPN triangulation of GRB030827 (large error box)
  3. GRB030823: optical observations
  4. GRB030823: optical observation at Tokyo Tech
  5. Lulin follow-up observations of GRB030823
  6. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  7. IPN detection of continued activity from SGR1806-20
  8. GRB 030817 = H2808 TAROT optical observations
  9. SGR 1808-20 (=H2802): A Possible new SGR
  10. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  11. XRF 030723: Detection of a rebrightening in the optical afterglow
  12. XRF030723, BVRcIc field photometry update
  13. IPN triangulation of GRB030801 (large error box)
  14. GRB021206 optical counterpart upper limit
  15. IPN triangulation of GRB030726 (large error box)
  16. IPN triangulation of GRB030721 (large error box)
  17. XRF030723 Radio Observations
  18. XRF 030723: confirmation of fading optical counterpart
  19. XRF030723(=H2777): Chandra Observations
  20. GRB030723: Upper limits from historical observations
  21. XRF030723: Palomar observations and proposed counterpart
  22. GRB030725 (=H2779): A Bright GRB Localized by HETE
  23. XRF030723 (= H2777): Chandra Observations Scheduled
  24. XRF030723, BVRcIc field photometry correction
  25. XRF030723, ROTSE-III Early Observations
  26. XRF030723, BVRcIc field photometry
  27. XRF 030723, optical observations
  28. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  29. Konus-Wind detection of the bursts from SGR1806-20 region
  30. SGR 1806-20, submm observations
  31. RXTE PCA Observations of SGR1806-20 Region
  32. IPN triangulation of GRB030714 (two large error boxes)
  33. IPN triangulation of GRB030715 (two large error boxes)
  34. GRB030706 triangulation (single large error box)
  35. GRB030329, optical observation in May
  36. IPN triangulation of GRB030626 (single large error box)
  37. IPN triangulation of GRB030626 (two large error boxes)
  38. GRB030329: second XMM-Newton observation
  39. GRB030329 -- RATAN-600 data in April-May
  40. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  41. IPN triangulation of GRB030606 (two alternate error boxes)
  42. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  43. GRB 030528: tentative NIR counterpart
  44. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  45. GRB030528, BVRI field photometry
  46. GRB030329, SPM optical observations
  47. GRB030528: Chandra TOO Planned
  48. GRB030528(=H2724): Revised SXC Localization
  49. GRB 030528 Bisei optical observation
  50. GRB030528 (H2724): A long GRB localized by HETE
  51. GRB 030329: Correction to GCN 2254
  52. GRB 030329: Optical Observations
  53. GRB 030528 (=H2724) Kyoto optical observation
  54. GRB 030416: Optical Observations
  55. GRB 030329 Optical Observations
  56. GRB030329: XMM-Newton observation
  57. GRB 021004: HST observations
  58. GRB030324: Further Observations of the Candidate Optical Afterglow
  59. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  60. IPN triangulation of GRB030519B=H2716 (small error box)
  61. HETE GRB030329, correction to Rc Observations in Loiano
  62. GRB 030329: Optical limit (contemporaneous imaging)
  63. IPN triangulation of GRB030509 (small errror box)
  64. GRB030329, BVRI photometry
  65. GRB030429, refiend optical brightness
  66. GRB 030329: Optical limit (contemporaneous photography)
  67. GRB030418, BVRcIc field photometry
  68. GRB030429, BVRcIc field photometry
  69. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  70. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  71. GRB030329: RTT150 optical observations and upper limit for a host
  72. GRB030501, optical observation
  73. GRB030501 triangulation (correction to GCN 2194)
  74. GRB030329: RTT150 optical observations and upper limit for a host
  75. GRB 030429: redshift from VLT spectroscopy
  76. GRB030501B triangulation (single error box)
  77. GRB 030329, BVRI photometry
  78. GRB030429: Optical Observations
  79. GRB030501: TAROT candidate afterglow present in archival images
  80. GRB 030429: confirmation of afterglow candidate
  81. GRB 030329 Oprical observations in Rozhen observatory
  82. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  83. IPN triangulation of GRB030425 (single error box)
  84. GRB 030329, the review of the sky area in plate archive (1950-1998)
  85. GRB 030329: optical spectropolarimetry at VLT
  86. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  87. GRB030329: optical polarization
  88. IPN triangulation of GRB030422 (two large error boxes)
  89. GRB030329, optical observation
  90. MASTER:optical observations GRB030418
  91. MASTER:optical observations probable GRB030414
  92. GRB030418: Kiso near infrared observations
  93. GRB 030418: Optical afterglow
  94. OT GRB 030329: early UBVRcIc spectral evolution
  95. OT GRB 030329: early spectrum
  96. IPN triangulation of GRB030414 (small error box)
  97. IPN triangulation of GRB030413 (small error box)
  98. Superluminal motion in GRB 030329 (Correction)
  99. Superluminal motion in GRB 030329
  100. GRB030329, optical position

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