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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"

64 results found.

  1. EP250827a: Global MASTER-Net observations report
  2. GRB 250520A: Swift/UVOT Upper Limits
  3. GRB 231214A: Swift-XRT refined Analysis
  4. LIGO/Virgo/KAGRA S231114n: Updated Sky localization
  5. Fermi GRB 220330A: Global MASTER-Net observations report
  6. GRB 210905A: Swift/UVOT Upper Limits
  7. Fermi trigger No 645857659: Global MASTER-Net observations report
  8. GRB 210104A: AstroSat CZTI detection
  9. GRB 190919B: GROND detection of the NIR afterglow
  10. Fermi GRB190508.81 Global MASTER-Net observations report
  11. Konus-Wind observation of GRB 180703A
  12. GRB 180402A: Swift/UVOT Upper Limits
  13. Trigger 813449: Swift detection of large burst from XTE J1701-407
  14. GRB 171102B: Swift/UVOT Upper Limits
  15. GRB 160629A: TAROT Calern observatory optical detection
  16. Swift-BAT trigger 686845 was due to noise near a known source
  17. GRB 160506A: Swift/UVOT Upper Limits
  18. GRB 160314A: Swift/UVOT Detection
  19. GRB 160127A: TAROT La Silla observatory optical light curve
  20. Swift trigger 637807 is probably not an astrophysical source
  21. GRB 150317A: Swift/UVOT Upper Limits
  22. Konus-Wind observation of GRB 141229A
  23. GRB 140930B: Swift/UVOT Upper Limits
  24. Trigger 538084: Swift detection of XTE J1739-302
  25. GRB 111215A: Swift-XRT refined Analysis
  26. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  27. GRB 110709A: Suzaku WAM observation of the prompt emission
  28. GRB 101213A: Swift-XRT refined Analysis
  29. IBAS Alert n. 6057 is not due to a GRB
  30. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  31. IBAS Alert 5992 is not a GRB, but XTE J1855-026
  32. Swift/BAT Detects an Outburst from XTE J1901+014
  33. Swift Trigger #382159 is due to XTE J1752-223
  34. Swift-BAT trigger 373691 is a galactic bulge transient
  35. GRB 091010: RXTE detection
  36. GRB 090621B: MAGIC telescope GeV observation
  37. Swift UVOT observations of GRB081028
  38. Swift detection of XTE J1701-407
  39. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  40. GRB080426: Swift/UVOT upper limits
  41. GRB080319B: Time-Independent XRT Spectrum
  42. A giant outburst from Cygnus X-1 detected by Konus-Wind and Suzaku-WAM
  43. OT20050728 was not an optical GRB afterglow
  44. An interactive program for GRB pseudo-redshift computations
  45. IPN observations of SGR1806-20
  46. Correction to GCN Circ 3476 on GRB050525A
  47. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  48. GRB 050525: pseudo-redshift
  49. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  50. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  51. IPN detection of continued activity from SGR1806-20
  52. XRF 030824: observations at CFHT
  53. RXTE PCA Observations of SGR1806-20 Region
  54. Detection of activity from SGR 1900+14 with the RXTE/PCA
  55. RXTE Observations of SGR 1900+14
  56. The X-ray Flash 011030 ('GRB 011030')
  57. SGR 1900+14 : RXTE observations
  58. Further Optical Observations of GRB 010324
  59. Optical Observations of GRB 010324
  60. GCN resumes full operations
  61. Chandra observation of the X-ray afterglow of GRB991216
  62. GRB 990506: Limits on the possible optical transient
  63. GRB990308 (Trig. 7457), optical observations
  64. GRB 980703: BATSE Observations

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