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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.

Advanced Search Examples (click to copy):

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

27396 results found.

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

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