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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"

27395 results found.

  1. GRB 031203: Optical/IR Astrometry
  2. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  3. XMM-Newton Observation of GRB031203
  4. GRB031203: K' Photometry of the likely GRB host
  5. XMM-Newton Observation of GRB031203
  6. GRB 031203: IR NTTobservations do not confirm REM detection
  7. GRB031203 : Optical Observation of Lulin Observatory
  8. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  9. GRB 031203: Apparent Spectral Break
  10. GRB031203: Planned XMM-Newton observation II
  11. GRB 031203: IR REM Observations
  12. GRB031203: Optical Observations
  13. GRB 031203 XMM-Newton observation
  14. GRB031203: Planned XMM-Newton observation
  15. GRB 031203: further analysis of INTEGRAL data
  16. GRB 030329: Planned XMM-Newton Observation
  17. GRB 031111B (= H2925) : Kyoto Optical Observation
  18. IPN triangulation of GRB031114 (large error box)
  19. GRB 031111, optical observations
  20. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  21. GRB030929/SN2003jd association unlikely based on IPN localiztion
  22. IPN triangulation of GRB031027 (small error box)
  23. Lulin optical follow-up observations of GRB031026
  24. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  25. IPN triangulation of GRB031024 (single error box)
  26. IPN triangulation of GRB031024 (annulus)
  27. IPN triangulation of GRB031020 (large error box)
  28. XRF 030824: additional observations at CFHT
  29. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  30. XRF 030723: Subaru Optical Observations
  31. XRF 030824: Early follow-up observation at Kiso observatory
  32. XRF 030824: observations at CFHT
  33. IPN triangulation of GRB030922B (large error box)
  34. XRF 030723: Detection of the likely host galaxy
  35. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  36. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  37. IPN triangulation of GRB030921 (large error box)
  38. IPN triangulation of GRB030919 (large error box)
  39. GRB030913: Subaru Optical Observations
  40. GRB 030913, optical candidate
  41. GRB 030913, BOOTES observations
  42. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  43. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  44. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  45. XRF030824: Optical observations
  46. IPN triangulation of GRB030903 (large error box)
  47. IPN triangulation of GRB030827 (large error box)
  48. GRB030823: optical observations
  49. GRB030823: optical observation at Tokyo Tech
  50. Lulin follow-up observations of GRB030823
  51. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  52. IPN detection of continued activity from SGR1806-20
  53. GRB 030817 = H2808 TAROT optical observations
  54. SGR 1808-20 (=H2802): A Possible new SGR
  55. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  56. XRF 030723: Detection of a rebrightening in the optical afterglow
  57. XRF030723, BVRcIc field photometry update
  58. IPN triangulation of GRB030801 (large error box)
  59. GRB021206 optical counterpart upper limit
  60. IPN triangulation of GRB030726 (large error box)
  61. IPN triangulation of GRB030721 (large error box)
  62. XRF030723 Radio Observations
  63. XRF 030723: confirmation of fading optical counterpart
  64. XRF030723(=H2777): Chandra Observations
  65. GRB030723: Upper limits from historical observations
  66. XRF030723: Palomar observations and proposed counterpart
  67. GRB030725 (=H2779): A Bright GRB Localized by HETE
  68. XRF030723 (= H2777): Chandra Observations Scheduled
  69. XRF030723, BVRcIc field photometry correction
  70. XRF030723, ROTSE-III Early Observations
  71. XRF030723, BVRcIc field photometry
  72. XRF 030723, optical observations
  73. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  74. Konus-Wind detection of the bursts from SGR1806-20 region
  75. SGR 1806-20, submm observations
  76. RXTE PCA Observations of SGR1806-20 Region
  77. IPN triangulation of GRB030714 (two large error boxes)
  78. IPN triangulation of GRB030715 (two large error boxes)
  79. GRB030706 triangulation (single large error box)
  80. GRB030329, optical observation in May
  81. IPN triangulation of GRB030626 (single large error box)
  82. IPN triangulation of GRB030626 (two large error boxes)
  83. GRB030329: second XMM-Newton observation
  84. GRB030329 -- RATAN-600 data in April-May
  85. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  86. IPN triangulation of GRB030606 (two alternate error boxes)
  87. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  88. GRB 030528: tentative NIR counterpart
  89. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  90. GRB030528, BVRI field photometry
  91. GRB030329, SPM optical observations
  92. GRB030528: Chandra TOO Planned
  93. GRB030528(=H2724): Revised SXC Localization
  94. GRB 030528 Bisei optical observation
  95. GRB030528 (H2724): A long GRB localized by HETE
  96. GRB 030329: Correction to GCN 2254
  97. GRB 030329: Optical Observations
  98. GRB 030528 (=H2724) Kyoto optical observation
  99. GRB 030416: Optical Observations
  100. GRB 030329 Optical Observations

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