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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"

27394 results found.

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

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