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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"

28085 results found.

  1. GRB 031203: IR REM Observations
  2. GRB031203: Optical Observations
  3. GRB 031203 XMM-Newton observation
  4. GRB031203: Planned XMM-Newton observation
  5. GRB 031203: further analysis of INTEGRAL data
  6. GRB 030329: Planned XMM-Newton Observation
  7. GRB 031111B (= H2925) : Kyoto Optical Observation
  8. IPN triangulation of GRB031114 (large error box)
  9. GRB 031111, optical observations
  10. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  11. GRB030929/SN2003jd association unlikely based on IPN localiztion
  12. IPN triangulation of GRB031027 (small error box)
  13. Lulin optical follow-up observations of GRB031026
  14. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  15. IPN triangulation of GRB031024 (single error box)
  16. IPN triangulation of GRB031024 (annulus)
  17. IPN triangulation of GRB031020 (large error box)
  18. XRF 030824: additional observations at CFHT
  19. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  20. XRF 030723: Subaru Optical Observations
  21. XRF 030824: Early follow-up observation at Kiso observatory
  22. XRF 030824: observations at CFHT
  23. IPN triangulation of GRB030922B (large error box)
  24. XRF 030723: Detection of the likely host galaxy
  25. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  26. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  27. IPN triangulation of GRB030921 (large error box)
  28. IPN triangulation of GRB030919 (large error box)
  29. GRB030913: Subaru Optical Observations
  30. GRB 030913, optical candidate
  31. GRB 030913, BOOTES observations
  32. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  33. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  34. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  35. XRF030824: Optical observations
  36. IPN triangulation of GRB030903 (large error box)
  37. IPN triangulation of GRB030827 (large error box)
  38. GRB030823: optical observations
  39. GRB030823: optical observation at Tokyo Tech
  40. Lulin follow-up observations of GRB030823
  41. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  42. IPN detection of continued activity from SGR1806-20
  43. GRB 030817 = H2808 TAROT optical observations
  44. SGR 1808-20 (=H2802): A Possible new SGR
  45. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  46. XRF 030723: Detection of a rebrightening in the optical afterglow
  47. XRF030723, BVRcIc field photometry update
  48. IPN triangulation of GRB030801 (large error box)
  49. GRB021206 optical counterpart upper limit
  50. IPN triangulation of GRB030726 (large error box)
  51. IPN triangulation of GRB030721 (large error box)
  52. XRF030723 Radio Observations
  53. XRF 030723: confirmation of fading optical counterpart
  54. XRF030723(=H2777): Chandra Observations
  55. GRB030723: Upper limits from historical observations
  56. XRF030723: Palomar observations and proposed counterpart
  57. GRB030725 (=H2779): A Bright GRB Localized by HETE
  58. XRF030723 (= H2777): Chandra Observations Scheduled
  59. XRF030723, BVRcIc field photometry correction
  60. XRF030723, ROTSE-III Early Observations
  61. XRF030723, BVRcIc field photometry
  62. XRF 030723, optical observations
  63. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  64. Konus-Wind detection of the bursts from SGR1806-20 region
  65. SGR 1806-20, submm observations
  66. RXTE PCA Observations of SGR1806-20 Region
  67. IPN triangulation of GRB030714 (two large error boxes)
  68. IPN triangulation of GRB030715 (two large error boxes)
  69. GRB030706 triangulation (single large error box)
  70. GRB030329, optical observation in May
  71. IPN triangulation of GRB030626 (single large error box)
  72. IPN triangulation of GRB030626 (two large error boxes)
  73. GRB030329: second XMM-Newton observation
  74. GRB030329 -- RATAN-600 data in April-May
  75. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  76. IPN triangulation of GRB030606 (two alternate error boxes)
  77. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  78. GRB 030528: tentative NIR counterpart
  79. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  80. GRB030528, BVRI field photometry
  81. GRB030329, SPM optical observations
  82. GRB030528: Chandra TOO Planned
  83. GRB030528(=H2724): Revised SXC Localization
  84. GRB 030528 Bisei optical observation
  85. GRB030528 (H2724): A long GRB localized by HETE
  86. GRB 030329: Correction to GCN 2254
  87. GRB 030329: Optical Observations
  88. GRB 030528 (=H2724) Kyoto optical observation
  89. GRB 030416: Optical Observations
  90. GRB 030329 Optical Observations
  91. GRB030329: XMM-Newton observation
  92. GRB 021004: HST observations
  93. GRB030324: Further Observations of the Candidate Optical Afterglow
  94. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  95. IPN triangulation of GRB030519B=H2716 (small error box)
  96. HETE GRB030329, correction to Rc Observations in Loiano
  97. GRB 030329: Optical limit (contemporaneous imaging)
  98. IPN triangulation of GRB030509 (small errror box)
  99. GRB030329, BVRI photometry
  100. GRB030429, refiend optical brightness

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