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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

28097 results found.

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

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