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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"

28055 results found.

  1. GRB 030913, BOOTES observations
  2. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  3. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  4. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  5. XRF030824: Optical observations
  6. IPN triangulation of GRB030903 (large error box)
  7. IPN triangulation of GRB030827 (large error box)
  8. GRB030823: optical observations
  9. GRB030823: optical observation at Tokyo Tech
  10. Lulin follow-up observations of GRB030823
  11. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  12. IPN detection of continued activity from SGR1806-20
  13. GRB 030817 = H2808 TAROT optical observations
  14. SGR 1808-20 (=H2802): A Possible new SGR
  15. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  16. XRF 030723: Detection of a rebrightening in the optical afterglow
  17. XRF030723, BVRcIc field photometry update
  18. IPN triangulation of GRB030801 (large error box)
  19. GRB021206 optical counterpart upper limit
  20. IPN triangulation of GRB030726 (large error box)
  21. IPN triangulation of GRB030721 (large error box)
  22. XRF030723 Radio Observations
  23. XRF 030723: confirmation of fading optical counterpart
  24. XRF030723(=H2777): Chandra Observations
  25. GRB030723: Upper limits from historical observations
  26. XRF030723: Palomar observations and proposed counterpart
  27. GRB030725 (=H2779): A Bright GRB Localized by HETE
  28. XRF030723 (= H2777): Chandra Observations Scheduled
  29. XRF030723, BVRcIc field photometry correction
  30. XRF030723, ROTSE-III Early Observations
  31. XRF030723, BVRcIc field photometry
  32. XRF 030723, optical observations
  33. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  34. Konus-Wind detection of the bursts from SGR1806-20 region
  35. SGR 1806-20, submm observations
  36. RXTE PCA Observations of SGR1806-20 Region
  37. IPN triangulation of GRB030714 (two large error boxes)
  38. IPN triangulation of GRB030715 (two large error boxes)
  39. GRB030706 triangulation (single large error box)
  40. GRB030329, optical observation in May
  41. IPN triangulation of GRB030626 (single large error box)
  42. IPN triangulation of GRB030626 (two large error boxes)
  43. GRB030329: second XMM-Newton observation
  44. GRB030329 -- RATAN-600 data in April-May
  45. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  46. IPN triangulation of GRB030606 (two alternate error boxes)
  47. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  48. GRB 030528: tentative NIR counterpart
  49. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  50. GRB030528, BVRI field photometry
  51. GRB030329, SPM optical observations
  52. GRB030528: Chandra TOO Planned
  53. GRB030528(=H2724): Revised SXC Localization
  54. GRB 030528 Bisei optical observation
  55. GRB030528 (H2724): A long GRB localized by HETE
  56. GRB 030329: Correction to GCN 2254
  57. GRB 030329: Optical Observations
  58. GRB 030528 (=H2724) Kyoto optical observation
  59. GRB 030416: Optical Observations
  60. GRB 030329 Optical Observations
  61. GRB030329: XMM-Newton observation
  62. GRB 021004: HST observations
  63. GRB030324: Further Observations of the Candidate Optical Afterglow
  64. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  65. IPN triangulation of GRB030519B=H2716 (small error box)
  66. HETE GRB030329, correction to Rc Observations in Loiano
  67. GRB 030329: Optical limit (contemporaneous imaging)
  68. IPN triangulation of GRB030509 (small errror box)
  69. GRB030329, BVRI photometry
  70. GRB030429, refiend optical brightness
  71. GRB 030329: Optical limit (contemporaneous photography)
  72. GRB030418, BVRcIc field photometry
  73. GRB030429, BVRcIc field photometry
  74. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  75. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  76. GRB030329: RTT150 optical observations and upper limit for a host
  77. GRB030501, optical observation
  78. GRB030501 triangulation (correction to GCN 2194)
  79. GRB030329: RTT150 optical observations and upper limit for a host
  80. GRB 030429: redshift from VLT spectroscopy
  81. GRB030501B triangulation (single error box)
  82. GRB 030329, BVRI photometry
  83. GRB030429: Optical Observations
  84. GRB030501: TAROT candidate afterglow present in archival images
  85. GRB 030429: confirmation of afterglow candidate
  86. GRB 030329 Oprical observations in Rozhen observatory
  87. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  88. IPN triangulation of GRB030425 (single error box)
  89. GRB 030329, the review of the sky area in plate archive (1950-1998)
  90. GRB 030329: optical spectropolarimetry at VLT
  91. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  92. GRB030329: optical polarization
  93. IPN triangulation of GRB030422 (two large error boxes)
  94. GRB030329, optical observation
  95. MASTER:optical observations GRB030418
  96. MASTER:optical observations probable GRB030414
  97. GRB030418: Kiso near infrared observations
  98. GRB 030418: Optical afterglow
  99. OT GRB 030329: early UBVRcIc spectral evolution
  100. OT GRB 030329: early spectrum

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